Records
Links
Author
Carstens, J
Title
Tropical Cyclogenesis from Self-aggregated Convection in Numerical Simulations of Rotating Radiative-convective Equilibrium
Type
$loc['typeManuscript']
Year
2019
Publication
Dissertations & Theses
Abbreviated Journal
Dissertations & Theses
Volume
Issue
Pages
Keywords
Abstract
Organized convection is of critical importance in the tropical atmosphere. Recent advances in numerical modeling have revealed that moist convection can interact with its environment to transition from a quasi-random to organized state. This phenomenon, known as convective self-aggregation,is aided by feedbacks involving clouds, water vapor, and radiation that increase the spatial variance of column-integrated frozen moist static energy. Prior studies have shown self-aggregation to takeseveral different forms, including that of spontaneous tropical cyclogenesis in an environment of rotating radiative-convective equilibrium (RCE). This study expands upon previous work to address the processes leading to tropical cyclogenesis in this rotating RCE framework. More specifically,a three-dimensional, cloud-resolving numerical model is used to examine the self-aggregation of convection and potential cyclogenesis, and the background planetary vorticity is varied on an f-plane across simulations to represent a range of deep tropical and near-equatorial environments.Convection is initialized randomly in an otherwise homogeneous environment, with no background wind, precursor disturbance, or other synoptic-scale forcing.All simulations with planetary vorticity corresponding to latitudes from 10°to 20°generate intense tropical cyclones, with maximum wind speeds of 80 m s−1or above. Time to genesis varies widely, even within a five-member ensemble of 20°simulations, reflecting a potential degree of stochastic variability based in part on the initial random distribution of convection. Shared across this so-called “high-f” group is the emergence of a midlevel vortex in the days leading to genesis,which has dynamic and thermodynamic implications on its environment that facilitate the spinup of a low-level vortex. Tropical cyclogenesis is possible in this model even at values of Coriolis parameter as low as that representative of 1°. In these experiments, convection self-aggregates into a quasi-circular cluster, which then begins to rotate and gradually strengthen into a tropical storm, aided by near-surface inflow and shallow overturning radial circulations aloft within the aggregated cluster. Other experiments at these lower Coriolis parameters instead self-aggregate into an elongated band and fail to undergo cyclogenesis over the 100-day simulation. A large portion of this study is devoted to examining in greater detail the dynamic and thermodynamic evolution of cyclogenesis in these experiments and comparing the physical mechanisms to current theories.
Address
Corporate Author
Thesis
Publisher
Florida State University - FCLA; ProQuest Dissertations & Theses Global
Place of Publication
Editor
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Summary Language
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Edition
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ISBN
Medium
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Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1054
Permanent link to this record
Author
Chassignet, E. P. ; Marshall, D. P.
Title
Gulf Stream Separation in Numerical Ocean Models
Type
$loc['typeBook Chapter']
Year
2008
Publication
Ocean Modeling in an Eddying Regime
Abbreviated Journal
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Issue
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Abstract
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Thesis
Publisher
American Geophysical Union
Place of Publication
Washington, DC
Editor
Hecht, M. W.; Hasumi, H.
Language
Summary Language
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ISBN
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Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
695
Permanent link to this record
Author
Chassignet, EP ; Jones, JW ; Misra, V ; Obeysekera, J
Title
Florida's Climate: Changes, Variations, & Impacts
Type
$loc['typeBook Whole']
Year
2017
Publication
Abbreviated Journal
Volume
Issue
Pages
Keywords
Abstract
Address
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Place of Publication
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Summary Language
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Series Editor
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ISBN
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Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
847
Permanent link to this record
Author
Chen, B. ; Smith, S.R. ; Bromwich, D.H.
Title
Evolution of the Tropospheric Split Jet over the South Pacific Ocean during the 1986-89 ENSO Cycle
Type
$loc['typeJournal Article']
Year
1996
Publication
Monthly Weather Review
Abbreviated Journal
Mon. Wea. Rev.
Volume
124
Issue
8
Pages
1711-1731
Keywords
Abstract
Address
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Thesis
Publisher
Place of Publication
Editor
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Summary Language
Original Title
Series Editor
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Series Issue
Edition
ISSN
0027-0644
ISBN
Medium
Area
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Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
712
Permanent link to this record
Author
Cocke, S.
Title
Case Study of Erin Using the FSU Nested Regional Spectral Model
Type
$loc['typeJournal Article']
Year
1998
Publication
Monthly Weather Review
Abbreviated Journal
Mon. Wea. Rev.
Volume
126
Issue
5
Pages
1337-1346
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Abstract
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Series Editor
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Edition
ISSN
0027-0644
ISBN
Medium
Area
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Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
745
Permanent link to this record
Author
Cocke, S. D. ; LaRow, T. E.
Title
), Seasonal Predictions of ENSO Impacts using a Nested Regional Spectral Model
Type
$loc['typeReport']
Year
1999
Publication
Abbreviated Journal
Volume
Issue
Pages
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Abstract
Address
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Place of Publication
Editor
Ritchie, H.
Language
Summary Language
Original Title
Series Editor
Series Title
CAS/JSC Working Group on Numerical Experimentation, Research Activities in Atmospheric and Oceanic Modeling
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Series Issue
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ISBN
Medium
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Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
773
Permanent link to this record
Author
Cocke, S. ; Christidis, Z. ; LaRow, T. ; Shin, D. W.
Title
Performance of a Coupled Ocean-Amosphere Model on the IBM SP4
Type
$loc['typeConference Article']
Year
2002
Publication
Proceedings from the Tenth Workshop on the Use of Parallel Computers, ECMWF, in Meteorology, Reading, U.K.
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Issue
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Abstract
Address
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Summary Language
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Series Editor
Series Title
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Series Issue
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ISBN
Medium
Area
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Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
863
Permanent link to this record
Author
Coles, V.J. ; Stukel, M.R. ; Brooks, M.T. ; Burd, A. ; Crump, B.C. ; Moran, M.A. ; Paul, J.H. ; Satinsky, B.M. ; Yager, P.L. ; Zielinski, B.L. ; Hood, R.R.
Title
Ocean biogeochemistry modeled with emergent trait-based genomics
Type
$loc['typeJournal Article']
Year
2017
Publication
Science (New York, N.Y.)
Abbreviated Journal
Science
Volume
358
Issue
6367
Pages
1149-1154
Keywords
Atlantic Ocean ; Biochemical Phenomena/genetics ; Metabolic Networks and Pathways/*genetics ; Metagenome ; *Metagenomics ; Microbial Consortia/*genetics ; Models, Biological ; Seawater/*microbiology ; Transcriptome
Abstract
Marine ecosystem models have advanced to incorporate metabolic pathways discovered with genomic sequencing, but direct comparisons between models and “omics” data are lacking. We developed a model that directly simulates metagenomes and metatranscriptomes for comparison with observations. Model microbes were randomly assigned genes for specialized functions, and communities of 68 species were simulated in the Atlantic Ocean. Unfit organisms were replaced, and the model self-organized to develop community genomes and transcriptomes. Emergent communities from simulations that were initialized with different cohorts of randomly generated microbes all produced realistic vertical and horizontal ocean nutrient, genome, and transcriptome gradients. Thus, the library of gene functions available to the community, rather than the distribution of functions among specific organisms, drove community assembly and biogeochemical gradients in the model ocean.
Address
Horn Point Laboratory, University of Maryland Center for Environmental Science (UMCES), Post Office Box 775, Cambridge, MD 21613, USA
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
English
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
0036-8075
ISBN
Medium
Area
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Conference
Funding
strtoupper('2').strtolower('9191900')
Approved
$loc['no']
Call Number
COAPS @ rl18 @
Serial
989
Permanent link to this record
Author
Cronin, M.F. ; Gentemann, C.L. ; Edson, J. ; Ueki, I. ; Bourassa, M. ; Brown, S. ; Clayson, C.A. ; Fairall, C.W. ; Farrar, J.T. ; Gille, S.T. ; Gulev, S. ; Josey, S.A. ; Kato, S. ; Katsumata, M. ; Kent, E. ; Krug, M. ; Minnett, P.J. ; Parfitt, R. ; Pinker, R.T. ; Stackhouse Jr., P.W. ; Swart, S. ; Tomita, H. ; Vandemark, D. ; Weller, A.R. ; Yoneyama, K. ; Yu, L. ; Zhang, D.
Title
Air-Sea Fluxes With a Focus on Heat and Momentum
Type
$loc['typeJournal Article']
Year
2019
Publication
Frontiers in Marine Science
Abbreviated Journal
Front. Mar. Sci.
Volume
6
Issue
Pages
Keywords
Abstract
Turbulent and radiative exchanges of heat between the ocean and atmosphere (hereafter heat fluxes), ocean surface wind stress, and state variables used to estimate them, are Essential Ocean Variables (EOVs) and Essential Climate Variables (ECVs) influencing weather and climate. This paper describes an observational strategy for producing 3-hourly, 25-km (and an aspirational goal of hourly at 10-km) heat flux and wind stress fields over the global, ice-free ocean with breakthrough 1-day random uncertainty of 15 W m–2 and a bias of less than 5 W m–2. At present this accuracy target is met only for OceanSITES reference station moorings and research vessels (RVs) that follow best practices. To meet these targets globally, in the next decade, satellite-based observations must be optimized for boundary layer measurements of air temperature, humidity, sea surface temperature, and ocean wind stress. In order to tune and validate these satellite measurements, a complementary global in situ flux array, built around an expanded OceanSITES network of time series reference station moorings, is also needed. The array would include 500–1000 measurement platforms, including autonomous surface vehicles, moored and drifting buoys, RVs, the existing OceanSITES network of 22 flux sites, and new OceanSITES expanded in 19 key regions. This array would be globally distributed, with 1–3 measurement platforms in each nominal 10° by 10° box. These improved moisture and temperature profiles and surface data, if assimilated into Numerical Weather Prediction (NWP) models, would lead to better representation of cloud formation processes, improving state variables and surface radiative and turbulent fluxes from these models. The in situ flux array provides globally distributed measurements and metrics for satellite algorithm development, product validation, and for improving satellite-based, NWP and blended flux products. In addition, some of these flux platforms will also measure direct turbulent fluxes, which can be used to improve algorithms for computation of air-sea exchange of heat and momentum in flux products and models. With these improved air-sea fluxes, the ocean’s influence on the atmosphere will be better quantified and lead to improved long-term weather forecasts, seasonal-interannual-decadal climate predictions, and regional climate projections.
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Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
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Series Issue
Edition
ISSN
2296-7745
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1067
Permanent link to this record
Author
Davidson, F. ; Alvera-Azcárate, A. ; Barth, A. ; Brassington, G.B. ; Chassignet, E.P. ; Clementi, E. ; De Mey-Frémaux, P. ; Divakaran, P. ; Harris, C. ; Hernandez, F. ; Hogan, P. ; Hole, L.R. ; Holt, J. ; Liu, G. ; Lu, Y. ; Lorente, P. ; Maksymczuk, J. ; Martin, M. ; Mehra, A. ; Melsom, A. ; Mo, H. ; Moore, A. ; Oddo, P. ; Pascual, A. ; Pequignet, A.-C. ; Kourafalou, V. ; Ryan, A. ; Siddorn, J. ; Smith, G. ; Spindler, D. ; Spindler, T. ; Stanev, E.V. ; Staneva, J. ; Storto, A. ; Tanajura, C. ; Vinayachandran, P.N. ; Wan, L. ; Wang, H. ; Zhang, Y. ; Zhu, X. ; Zu, Z.
Title
Synergies in Operational Oceanography: The Intrinsic Need for Sustained Ocean Observations
Type
$loc['typeJournal Article']
Year
2019
Publication
Frontiers in Marine Science
Abbreviated Journal
Front. Mar. Sci.
Volume
6
Issue
Pages
Keywords
Abstract
Operational oceanography can be described as the provision of routine oceanographic information needed for decision-making purposes. It is dependent upon sustained research and development through the end-to-end framework of an operational service, from observation collection to delivery mechanisms. The core components of operational oceanographic systems are a multi-platform observation network, a data management system, a data assimilative prediction system, and a dissemination/accessibility system. These are interdependent, necessitating communication and exchange between them, and together provide the mechanism through which a clear picture of ocean conditions, in the past, present, and future, can be seen. Ocean observations play a critical role in all aspects of operational oceanography, not only for assimilation but as part of the research cycle, and for verification and validation of products. Data assimilative prediction systems are advancing at a fast pace, in tandem with improved science and the growth in computing power. To make best use of the system capability these advances would be matched by equivalent advances in operational observation coverage. This synergy between the prediction and observation systems underpins the quality of products available to stakeholders, and justifies the need for sustained ocean observations. In this white paper, the components of an operational oceanographic system are described, highlighting the critical role of ocean observations, and how the operational systems will evolve over the next decade to improve the characterization of ocean conditions, including at finer spatial and temporal scales.
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
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Summary Language
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Series Editor
Series Title
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Series Issue
Edition
ISSN
2296-7745
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1083
Permanent link to this record