| Anomalous Tropical Ocean Circulation Associated with La Nina Modoki |
02 Dec 2011 |
16 pages |
| Authors:
Toshiaki Shinoda; Harley E Hurlburt; E J Metzger; NAVAL OCEAN RESEARCH AND DEVELOPMENT ACTIVITY STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
 | El Nino Modoki is a variant of El Nino characterized by warming around the dateline flanked by anomalous cooling in the east and west. However, the opposite phase (La Nina Modoki) has received little attention because the prominent cooling of sea surface temperature (SST) during major La Nina events is observed in the central Pacific, and thus, it is difficult to define the two different types of cold events from ... |
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| Eddy Processes of the Western Adriatic Current Near Cape Gargano |
Jan 2010 |
2 pages |
| Authors:
Jeffrey W Book; D M Burrage; S Carniel; R Hobbs; P J Martin; E A Midgely; M Rixen; K Schroeder; I Vilibic; W Wood; NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| Eddy processes of the Western Adriatic Current near Cape Gargano are highly modulated by the wind, growing during calm periods following strong wind events. Both single anticyclones and trains of multiple eddies with a regular spacing are observed. Suppression of a single anticyclone in the lee of the Cape was observed by profiling SEPTR moorings to occur when the horizontal gradient of the thermocline depth was increased by the wind. ... |
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| Topographic Effects on the Anticyclonic Vortex Evolution: A Modeling Study |
04-Mar-2008 |
16 pages |
| Authors:
Patrick J Hogan; Kyung H Hyun; UNIVERSITY OF SOUTHERN MISSISSIPPI STENNIS SPACE CENTER CENTER FOR MARINE SCIENCE
|
| The evolution of anticyclonic vortices in the presence of topographic effects associated with continental slope steepness and orientation is investigated using the Hybrid Coordinate Ocean Model. The trajectories of the vortices are analyzed using various configurations of slope steepness and orientation, including a flat bottom. As the steepness of the slope is increased, the development and evolution of a counter-rotating subsurface vortex (`deep cyclone') is strongly dispersive resulting in strong ... |
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| The Extratropical Transition of Tropical Storm Banyan |
SEP 2006 |
90 pages |
| Authors:
Michael D. Vancas; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF METEOROLOGY
|
| During July 2005, Typhoon Banyan recurved and underwent extratropical transition over the western North Pacific. Coincident with the extratropical transition of Banyan, a large mid-tropospheric anticyclone developed immediately east of the recurving typhoon. The anticyclone was associated with a high-amplitude, Rossby wave-like pattern that developed downstream of the anticyclone and extended across the North Pacific. Development of the anticyclone is examined with respect to the interaction between the outflow from ... |
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| Interannual Variability of Tehuantepec Eddies |
2006 |
23 pages |
| Authors:
Luis Zamudio; Harley E. Hurlburt; E. J. Metzger; Steven L. Morey; James J. O'Brien; Charles Tilburg; Jorge Zavala-Hidalgo; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| TOPEX/Poseidon satellite altimeter observations and the Naval Research Laboratory Layered Ocean Model simulations show interannual variability in the number intensity of Tehuantepec eddies off the Mexican southwest coast. Analysis of the results illustrates that downwelling coastally trapped waves, which are generated in the equatorial Pacific, play a crucial role in the modulation and generation of Tehuantepec eddies and a paradigm in which the generation and modulation of Tehuantepec eddies is ... |
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| Observed Deep Circulation in the Ulleung Basin |
15 JUL 2005 |
26 pages |
| Authors:
W. J. Teague; K. L. Tracey; D. R. Watts; J. W. Book; K. -I. Chang; P. J. Hogan; D. A. Mitchell; M. -S. Suk; M. Wimbush; J. -H Yoon; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| Records from 16 current meters and 23 pressure gauges moored near the sea floor in the Ulleung Basin of the southwestern Japan/East Sea (JES) characterized the deep circulation between June 1999 and July 2001. Mean currents range from 1 to 4 cm/s and deep pressure anomalies range from 3 to 10 mbar, with horizontal correlation scales of about 40km, and with integral time scales that range from about S to ... |
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| High Resolution Modeling of the Gulf of Mexico |
JUL 2005 |
4 pages |
| Authors:
Patrick J. Hogan; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| An advanced, high-resolution numerical ocean model is employed to investigate the dynamics and physical characteristics of the deep and shallow circulation in the Gulf of Mexico. The resolution of the ocean model (approx. 4 kilometers) and revolutionary hybrid (quasi-isopycnic) vertical coordinate makes it an excellent candidate to form the ocean model core of an ocean acoustic tomography program that can provide near real-time subsurface ocean data to augment satellite data ... |
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| Ice-Ocean Environmental Buoy Program: Archived Data Processing and Graphical Results from April 1992 through November 1998 |
AUG 1999 |
|
| Authors:
Richard Krishfield; Susumu Honjo; Takatoshi Takizawa; Kiyoshi Hatakeyama; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
 | Between 1992 and 1998, three Ice-Ocean Environmental Buoys (IOEBs) were deployed a total of six times on multiyear pack ice in the Arctic Ocean. The processing scheme for the telemetered environmental data, as well as the individual IOEBs and field operations, are described, and the processed data are presented in graphical form. The IOEB Archived Data Processing (IADP) processing scheme was conceived specifically to remove noise in ... |
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| A Modeling Study of the Coastal Eastern Boundary Current System Off Iberia and Morocco |
MAR 1999 |
98 pages |
| Authors:
Johnny R. Martinez; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| To investigate the Northern Canary Current System (NCCS), results from four numerical experiments of increasing complexity are examined. Experiment I, which uses seasonal wind forcing only, shows that, as expected, wind forcing is the key generative mechanism for the current, upwelling, meander, eddy, and filament structures. Experiments 2 and 3 have the addition of an irregular coastline. These two experiments show that capes are areas for enhanced upwelling, extensive filaments, ... |
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| Three-Dimensional Structure and Evolution of the Mixed Layer in the Arabian Sea |
30 Sep 1998 |
4 pages |
| Authors:
Kenneth H Brink; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| The long term goal of this effort is to understand better how the upper ocean responds to realistic, spatially complex wind stress patterns. Specifically, upper ocean effects related to both mid-ocean and coastal upwelling are of interest. The main scientific objective is to understand the physical processes that control the structure and evolution of the mixed layer in the Arabian Sea. Of particular interest are the effects of these variations ... |
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| Mapping Jets and Eddies in an Eastern Boundary Current |
24 APR 98 |
6 pages |
| Authors:
Adriana Huyer; P. Michael Kosro; Jack A. Barth; Robert L. Smith; OREGON STATE UNIV CORVALLIS COLL OF OCEANIC AND ATMOSPHERIC SCIENCES
|
| This report summarizes results of two large area, high resolution Seasoar/ADCP surveys of the California Current. We conclude that this is a region of intense interactions between jets, eddies, coastal currents and the continental margin. |
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| Freezing Precipitation |
31 MAR 1998 |
132 pages |
| Authors:
Eugene M. Weber; AIR FORCE WEATHER AGENCY OFFUTT AFB NE
|
| This technical note discusses three advection patterns favorable for freezing precipitation. Two graphs were developed based on 503 freezing precipitation occurrences during the past 11 years- a 1000- to 500-mb thickness graph and an 850-mb temperature graph. Two anticyclonic pressure patterns are discussed throughout the technical note. Relationships between inverted troughs and 850-mb lows are presented. Considerable discussion on synoptic patterns across the continental United States is included. This technical ... |
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| Extension of the Systematic Approach to Tropical Cyclone Track Forecasting in the Eastern and Central North Pacific |
DEC 1997 |
150 pages |
| Authors:
mark A. Boothe; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This study extends an earlier study (White 1995) of the application of the Systematic Approach to tropical cyclone track forecasting of Carr and Elsberry to the eastern and central North Pacific, and contrasts these cases with those in the western North Pacific. The data sample is first expanded to seven years (1990-1996). Modifications to the environment structure conceptual models are: (1) introduction of two Dominant Ridge synoptic regions named Ridge ... |
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| Analysis of Fine Structure and Microstructure Data from Fieberling Guyot |
30 APR 97 |
|
| Authors:
John M. Toole; Raymond W. Schmitt; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| Collection, reduction, and analysis of ocean finestructure and microstructure profiles about Fieberling Guyot, a seamount in the northeast Pacific Ocean, formed the core of research. Our research focused on developing understanding of turbulent mixing associated with flow about major bathymetric features, and as such, contributed to the Topographic interactions Accelerated Research Initiative. The intensified mixing documented at Fieberling Guyot suggests that near rough bottom regions of the ocean are key ... |
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| Lagrangian Measurements of Eddy Characteristics in the California Current System |
MAR 97 |
134 pages |
| Authors:
James G. Sires; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| During the Eastern Boundary Current program in 1993, 96 Argos-tracked surface drifters, drogued to 15 m depth, and satellite thermal imagery were used to provide a description of the mesoscale features in the California Current System off the northern California coast. The drifter movements and satellite images revealed a highly energetic series of filaments and eddies that dominated the summer flow field off the coast, similar to those noted in ... |
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| Tropical Cyclone Motion in the Western Pacific |
15 JUL 96 |
11 pages |
| Authors:
Thomas A. Schroeder; Bin Wang; HAWAII UNIV HONOLULU DEPT OF METEOROLOGY
|
| A systematic examination of the physics of beta-drift of tropical cyclones has been undertaken. Sequentially we analysed beta-drift of a vortex with baroclinic structure, explored the physics of development and gyration of beta gyres and then exposed the vortex to environmental shears. Through this work we have: identified physical factors controlling drift of a baroclinic vortex in a quiescent environment, identified variability of drift due to vortex structure, developed a ... |
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| The Effect of 300 mb Divergence on Surface Cyclogensis |
DEC 95 |
131 pages |
| Authors:
Erika L. Sauer; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Quantitative predictions of surface extratropical cyclone development are correlated to the degree of upper-level forcing from 500 mb vorticity advection and 300 mb divergence. Although it is difficult to obtain an accurate analysis of upper-level divergence, modern models and data assimilation procedures do produce consistent divergence fields. The divergence field partitioned into the longitudinal (alongstream) and transverse (cross-stream) components approximately estimates the effect of curvature and jet streaks on cyclone ... |
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| Dynamic Adjustment of Mesoscale Convective Lower-Stratospheric Outflows |
10 SEP 95 |
99 pages |
| Authors:
Scott A. Hausman; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| Recent observational studies of upper-tropospheric and lower- stratospheric winds atop mesoscale convective systems show the development of anticyclonic outflow. We propose that the anticyclone formation can be partially explained by the gradient adjustment that follows the nearly instantaneous vertical redistribution of mass by the convection. With the convection idealized by an impulsive, diabatic mass transfer from the lower troposphere to a layer near the tropopause. The ... |
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| Collections of the Works of Erevan Hydrometeorological Observatory Release 1 |
06 SEP 95 |
191 pages |
| Authors:
NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| The territory of Armenian SSR is subjected to the effect air masses, which are spread from the moderate and subtropics. High-altitude pressure charts are shown. Seasonal variations are discussed. The examination of aerosynoptic material within the period from 1944 through 1955 confirmed the special features for the territory of Armenian SSR. It is clear from the weather maps that the area is subjected to cyclo-anticyclonic activity and frontal processes, most ... |
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| Diecast Model Simulation of the California Coastal Zone |
SEP 95 |
109 pages |
| Authors:
Stanley A. Akahoshi; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The high resolution DIECAST ocean model is used to simulate mesoscale variability in the California coastal zone. This simulation uses realistic topography and coastal geometry with boundary forcing only in the form of an equatorward-flowing jet, structured after observations, imposed at the northern boundary. The mesoscale features produced by the model are qualitatively consistent with those seen in observations. Their spatial scales are somewhat larger and their intensities somewhat weaker ... |
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| Tropical Cyclone Propagation |
NOV 94 |
38 pages |
| Authors:
William M. Gray; COLORADO STATE UNIV FORT COLLINS DEPT OF ATMOSPHERIC SCIENCE
|
| This paper discusses the question of tropical cyclone propagation or why the average tropical cyclone moves 1-2 m/s faster and usually 10-20 deg to the left of its surrounding (or 5-7 deg radius) deep layer (850-300 mb) steering current. It is shown that the primary factor causing tropical cyclones to propagate faster and to the left of their steering flow is their location within a baroclinic environment. Irrespective of direction ... |
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| Observational and Theoretical Analyses of Physical Processes Influencing Tropical Cyclone Motion |
NOV 94 |
39 pages |
| Authors:
William M. Gray; COLORADO STATE UNIV FORT COLLINS DEPT OF ATMOSPHERIC SCIENCE
|
| This paper discusses the question of tropical cyclone propagation of why the average tropical cyclone moves 1-2 m/s faster and usually 10-20 to the left of its surrounding (or 5-7 deg radius) deep layer (850-300 mb) steering current. It is shown that the primary factor causing tropical cyclones to propagate faster and to the left of their steering flow is their location within a baroclinic environment. Irrespective of direction to ... |
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| Short Term Teleconnections Associated with Western Pacific Tropical Cyclones |
JUN 94 |
151 pages |
| Authors:
Cory A. Springer; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The short term teleconnections arising from an individual tropical cyclone in the western Pacific were examined using a global operational data assimilation system and forecast model. In the data assimilation, the tropical cyclone was modified using a tropical cyclone bogusing procedure that other maintained the storm in, or eliminated the storm from, the model's initial conditions. These different initial conditions were used as the initial fields for several 20 day ... |
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| Evidence for Eddy Formation in the Eastern Arabian Sea During the Northeast Monsoon |
15 APR 1994 |
16 pages |
| Authors:
John G. Bruce; Donald R. Johnson; John C. Kindle; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| The seasonal formation of a large (500-800 km diameter) anticyclonic eddy in the upper 300-400 m of the Eastern Arabian Sea during the northeast monsoon period (December-April) is indicated from hydrographic and satellite altimetry sea level observations, as well as from numerical model experiments. The center of the eddy circulation is approximately 10 degrees N, 70 degrees E, just to the west fo the north-south Laccadive Island chain. In this ... |
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| Four Years of Global Cirrus Cloud Statistics Using HIRS, Revised |
JAN 1994 |
58 pages |
| Authors:
Donald P. Wylie; W. P. Menzel; Harold M. Woolf; Kathleen I. Strabala; WISCONSIN UNIV-MADISON SPACE SCIENCE AND ENGINEERING CENTER
|
| Trends in global upper tropospheric transmissive cirrus cloud cover are beginning to emerge from a four year cloud climatology using NOAA polar orbiting HIRS multispectral infrared data. Cloud occurrence, height, and effective emissivity are determined with the CO2 slicing technique on the four years of data (June 1989 - May 1993). There is a global preponderance of transmissive high clouds, 42% on the average; about ... |
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| An Investigation Using Empirical Orthogonal Functions and Objective Analysis to Analyse the Vertical Temperature Structure of a Gulf Stream Meander |
MAR 93 |
157 pages |
| Authors:
Martin J. Sauze; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Expendable bathymetric temperature (XBT) data taken from an anticyclonic meander crest within the Gulf Stream (Hummon 1991) is analysed by looking at the empirical vertical structure. The ensemble averaged data is formed into a projection matrix that compares the value of the temperature at one depth with the temperature at a second depth. The data was smoothed with the correlation analysis being performed at ten metre intervals from five metres ... |
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| KERE Hydrographic/Tracer Studies |
93 |
10 pages |
| Authors:
Alan M. Shiller; UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG
|
| This project involved making a closely-spaced hydrographic section across the kuroshio near the point where it departs from the Japanese Coast. |
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| Interaction of an Eddy with a Continental Slope |
SEP 92 |
|
| Authors:
Xiaoming Wang; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| This study concerns the barotropic interactions between a mesoscale eddy and a straight monotonic bottom topography. Through simple to relatively complicated modeling effort, some of the fundamental properties of the interaction are investigated. The fundamental aspects of the interaction are examined using a simple contour dynamics model. With the simplest model configuration of an ideal vortex and a step topography, the basic dynamical features of the observed oceanic eddy-topography interaction ... |
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| SOFAR Float Trajectories from an Experiment to Measure the Atlantic Cross Equatorial Flow (1989-1990) |
AUG 92 |
|
| Authors:
Philip L. Richardson; Marguerite E. Zemanovic; Christine M. Wooding; William J. Schmitz Jr; James F. Price; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| Neutrally buoyant SOFAR floats at nominal depths of 800, 1800, and 3300 m were tracked for 21 months in the vicinity of western boundary currents near 6N and at several sites in the Atlantic near 11N and along the equator. Trajectories at 1800 m show a swift (> 50 cm.sec), narrow (100 km wide) southward-flowing deep western boundary current (DWBC) extending from 7N to the equator. At times (February-March 1989) ... |
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| Radar Based Case Study of a Northeast Colorado Winter Storm |
01 JUN 92 |
175 pages |
| Authors:
Nicolas S. Powell; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| Radar and conventional meteorological data collected during the 19-20 January 1991 winter storm over Northeast Colorado as part of WISP-91 (Winter Icing and Storm Project) were analyzed to describe observations of snow bands and possible band formation mechanisms. A review of the synoptic situation led to classification of this storm as an anticyclonic type of upslope storm. Single and dual-Doppler radar analyses showed well organized mesoscale snow bands oriented west-southwest ... |
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| Eddy Generation at a Convex Corner by a Coastal Current in a Rotating System |
MAR 92 |
|
| Authors:
Barry A. Klinger; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| Rotating baroclinic and barotropic boundary currents flowing around a corner in the laboratory were studied in order to discover the circumstances under which eddies were produced at the corner. Such flows are reminiscent of oceanic coastal flows around capes. When the baroclinic currents, which consisted of surface flows bounded by a density front, encountered a sharp corner, immediately downstream of the corner an anticyclone grew in the surface layer for ... |
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| Mesoscale Variability of the Caribbean Sea from GEOSAT |
MAR 91 |
66 pages |
| Authors:
Carlos A. Amaya; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Two years of GEOSAT Exact Repeat Mission (ERM) altimetry and wind speed measurements inn the Caribbean Sea are used to determine the sea surface height mesoscale variability and to characterize the wind stress field during 1987-88. The alongtrack sea surface anomalies are determined using along track derivatives for estimation of the mean sea surface height and at least square fit is used to remove the orbital error. Biased points near ... |
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| A Numerical Study of Eddy Steering by Background Flows |
DEC 90 |
|
| Authors:
Ray T. Huddleston Jr; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Gulf Stream warm core rings are intense, isolated eddies which form to the north of the Gulf Stream from cutoff meanders which detach from the Stream. After their formation they are embedded in the cooler Slope Water which flows generally westward, impinging on the continental slope near 70 W. Observations indicate that the Slope Water flows westward at approximately 5 cm/ s. In this study, the effect of background shear ... |
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| Source of Cold Water in Monterey Bay Observed by AVHRR Satellite Imagery |
DEC 90 |
136 pages |
| Authors:
Dan E. Tracy; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A one year record of Advanced Very High Resolution Radiometer (A VHRR) satellite images, beginning October 1, 1988, was processed and evaluated to determine the source of cold, nutrient-rich water in Monterey Bay. Wind records indicated a strong correlation with the intensity of upwelling at Ano Nuevo and Point Sur as seen in numerous satellite images. Close quantitative agreement between satellite derived multi-channel sea surface temperature and in situ observation ... |
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| Observations and Modeling of Currents Within the Monterey Bay During May 1988 |
JUN 90 |
120 pages |
| Authors:
Kim A. Koehler; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| April and May of 1988 along the central California coast were characterized as a period of strong coastal upwelling produced by moderate to strong northwesterly winds present throughout the period. A product of this upwelling event was the manifestation of southward geostrophic currents which extended to a distance of approximately 50 km from the coast. From 08 to 11 May 1988, hydrographic surveying was conducted within the Monterey Bay. Internal ... |
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| The Loop Current and Its Role in the Dynamics and Circulation of the Gulf of Mexico |
90 |
|
| Authors:
J. D. Thompson; H. E. Hurlburt; A. Wallcraft; NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS
|
| The Gulf of Mexico is an ideal basin to study ocean dynamics since it contains many features of much larger mid-latitude domains. A major current system, the Loop Current, dominates the circulation of the basin. Large anticyclonic rings, cross-shelf exchanges, a highly energetic western boundary regime, and smaller cyclonic and anticyclonic eddies are at least in part energized by the Loop Current. The relatively small size of the Gulf and ... |
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| Modons and Monopoles on a gamma-Plane |
90 |
|
| Authors:
Doron Nof; FLORIDA STATE UNIV TALLAHASSEE DEPT OF OCEANOGRAPHY
|
| The gamma plane approximation introduced in this study corresponds to a nonlinear horizontal shallow flow in a plane where, in addition to the familiar linear variation of f (i.e., beta), there is a quadratic variation with latitude. Such a plane may have some application to the mesoscale oceanic flow in the immediate vicinity of the North Pole because at the pole the linear gradient (beta) vanishes so that the quadratic ... |
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| A Forecasting System Using the Parabolic Equation Application to Surface-to-Air Propagation in the Presence of Elevated Layers, |
SEP 1989 |
|
| Authors:
K. H. Craig; M. F. Levy; RUTHERFORD AND APPLETON LABS CHILTON (UNITED KINGDOM)
|
| The parabolic equation approach to clear-air propagation modelling overcomes many of the difficulties associated with ray and mode theory methods. A parabolic equation model has been implemented on a PC based system using a transputer to carry out the computationally intensive numerical integrations. The model has been used from VHF to millimetric frequencies and applied to evaporation duct and elevated duct problems. The latter are important for surface-to-air propagation and ... |
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| Development and Testing of a Device Capable of Placing Model Piles by Driving and Pushing in the Centrifuge |
MAY 89 |
320 pages |
| Authors:
John J. Gill; AIR FORCE WEAPONS LAB KIRTLAND AFB NM
|
| Elastic wave propagation and the practical aspects of pile driving are discussed to develop an understanding of which aspects of pile driving must be modeled most precisely in the centrifuge. The scaling laws are developed. Design and construction of a 5 g-ton (110 g) centrifuge are presented. Construction details of the model pile placement device are discussed. The placement device has the capability of driving individual piles and can model ... |
|
| Investigation of North Atlantic Fog and Development of a Marine Fog Forecast System |
APR 89 |
58 pages |
| Authors:
C. W. Rogers; CALSPAN CORP BUFFALO NY
|
| Ocean fog and haze were studied to provide additional expertise for An Expert-system for Shipboard Obscuration Prediction (AESOP). Task I studied fog occurrence in the N. Atlantic and developed an AESOP rule base for these fogs, Task II evaluated forecast errors generated during a test of AESOP, and modified and extended the rule base to correct for these errors. Fog is primarily a summertime phenomenon in the N. Atlantic. Taylor ... |
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| Numerical Ocean Prediction in the California Coastal Region Using a High-Resolution Primitive Equation Model |
JUN 88 |
52 pages |
| Authors:
Clifford D. Johnson; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A high resolution, multi-level, primitive equation (PE) model of the California coastal region is initialized with a temperature field analyzed from real data collected during the OPTOMA11 cruises of June and July, 1984, for the purpose of forecasting the movement of thermal features in the region. The results are compared to the observations and to the forecast experiments of Rienecker et al. (1987), since they initialized their quasi-geostrophic (QG) model ... |
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| The Role of Vortex Structure in Tropical Cyclone Motion |
DEC 87 |
|
| Authors:
Michael Fiorino; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The role of vortex structure in tropical cyclone motion is studied using a moving-grid, nondivergent barotropic model on a beta plane in a no flow environment. Initial condition sensitivity tests reveal that the northwestward beta drift of the vortex is controlled by the symmetric circulation in the r = 300 - 800 km critical annulus. Enhanced cyclonic or anticyclonic flow in this critical annulus leads to long-term cyclonic or anticyclonic ... |
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| Laboratory Experiments on the Merging of Nonlinear Anticyclonic Eddies |
MAR 87 |
|
| Authors:
Doron Nof; Leslie M. Simon; FLORIDA STATE UNIV TALLAHASSEE
|
| The mutual interaction of two isolated lenslike eddies is examined with the aid of a laboratory experiment on a rotating table. The isolated anticyclonic eddies are formed by withdrawing two cylinders containing a mixture of Freon (with a density of 1.53 gm lcc), and silicone oil (with a density of 0. 853 gm lcc). The cylinders are embedded in water, and the collapse of the mixture forces two identical lenslike ... |
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| AXBT (Air-Deployed Expendable Bathythermograph) Measurements Off the Northeast Coast of South America, Fall 1985 |
DEC 86 |
|
| Authors:
Janice D. Boyd; NAVAL OCEAN RESEARCH AND DEVELOPMENT ACTIVITY NSTL STATION MS
|
| In Oct. 1985, 305 air-deployed expendable bathythermograph profiles were taken in a region of large-scale thermohaline steps. This report presents a map in the location of the staircase field during this time, contours of the depths of the 6 -26 C isotherms, and individual profile plots. Mesoscale flow patterns are inferred from the isotherm plots, and the location of the staircases in relation to the flow field is discussed. Improved ... |
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| Complex Principal Component Analysis of Sea Level Pressure Over Eastern North America and the Western Atlantic Ocean: A Search for Preferred Disturbance Activity Areas |
86 |
|
| Authors:
Frank L. Estis; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The purpose of this study was to identify preferred areas of synoptic scale disturbance activity through use of the objective analysis technique called complex principal component analysis. The technique was applied to a sea level pressure data set consisting of twice daily observations (00 and 12 GMT) during the months of January, February, and March, for the years 1973-1976 and 1979-1982. These months were chosen to encompass the time frame ... |
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| Numerical Simulation of Cold Surges |
SEP 85 |
|
| Authors:
Nancy E. Harris; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A global, six-level primitive equation model was numerically integrated to examine the interaction of a planetary wave with a growing mid- latitude baroclinic wave. The purpose of this study was to determine the contribution of the baroclinic wave to the initiation of a monsoon surge. Three experiments were run. Experiment I depicted the effect of the planetary wave on the southward migration of cold air. The cyclogenesis of a mid-latitude ... |
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| A Case Study of a Mid-Atlantic Coastal Front |
85 |
|
| Authors:
J. T. Kroll; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| A unique case of mid-Atlantic coastal frontogenesis on December 21- 22, 1983 is examined to determine the evolution of the three dimensional structure of this mesoscale phenomena. Analysis of synoptic and mesoscale surface maps suggest a coastal front which moves steadily inland. However, review of temperature and wind profiles at individual stations reveals that frontogenesis actually occurs over the land in North Carolina and southern Virginia. Lagrangian and Eulerian frontogenesis ... |
|
| Forecasters Handbook for the Southern African Continent and Atlantic/ Indian Ocean Transit |
NOV 84 |
|
| Authors:
F. R. Williams; R. J. Renard; G. H. Jung; R. D. Tomkins; R. R. Picard; NAVAL ENVIRONMENTAL PREDICTION RESEARCH FACILITY MONTEREY CA
|
| This handbook describes the analysis and forecasting of atmospheric and oceanic conditions important to air/sea operations over and near the southern African continent, to include Kenya, Tanzania, Mozambique, Republic of South Africa, and Namibia. Weather over the Malagasy Republic (formerly Madagascar), Mauritius and Reunion (the Mascarene Islands) and Seychelles Islands is also addressed. Included are descriptions of such coastal phenomena as fog, gale frequency, and onshore/offshore winds, as well as ... |
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| Collinear-Track Altimetry in the Gulf of Mexico from SEASAT: Measurements, Models and Surface Truth |
JUN 1982 |
|
| Authors:
J. Dana Thompson; George H. Born; George A. Maul; NAVAL OCEAN RESEARCH AND DEVELOPMENT ACTIVITY NSTL STATION MS
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| From 17 September to 10 October 1978 SEASAT made collinear passes over the Gulf of Mexico. Altimeter data for eight, three-day repeat passes over the eastern Gulf were examined using an arc-segment fitting technique to determine the mesoscale temporal variability of the sea surface. The pattern of sea height variability was then compared with sea height data generated by a numerical model of the Gulf (Hurlburt and Thompson, 1980) from ... |
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| The Occurrence of the Southeast Wind in the Elbe Valley |
16 FEB 1982 |
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| Authors:
H. Wehner; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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