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Author
Yin, J., E.P. Chassignet, W.G. Large, N.J. Norton, A.J. Wallcraft, and S.G. Yeager
Title
Salinity boundary conditions and the Atlantic meridional overturning circulation in depth and quasi-isopycnic coordinate global ocean models
Type
$loc['typeJournal Article']
Year
2009
Publication
Ocean Modelling
Abbreviated Journal
Volume
Issue
Pages
submitted
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
659
Permanent link to this record
Author
Yin, J. ; Schlesinger, M.E. ; Stouffer, R.J.
Title
Model projections of rapid sea-level rise on the northeast coast of the United States
Type
$loc['typeJournal Article']
Year
2009
Publication
Nature Geoscience
Abbreviated Journal
Nature Geosci
Volume
2
Issue
4
Pages
262-266
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1752-0894
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
394
Permanent link to this record
Author
Yu, B. ; Seed, A. ; Pu, L. ; Malone, T.
Title
Integration of weather radar data into a raster GIS framework for improved flood estimation
Type
$loc['typeJournal Article']
Year
2019
Publication
Atmospheric Science Letters
Abbreviated Journal
Atmos. Sci. Lett.
Volume
6
Issue
1
Pages
Keywords
Abstract
We present in this paper the interannual variability of seasonal temperature and rainfall in the Indian meteorological subdivisions (IMS) for boreal winter and summer seasons that take in to account the varying length of the seasons.Our study reveals that accounting for the variations in the length of the sea-sons produces stronger teleconnections between the seasonal anomalies of surface temperature and rainfall over India with corresponding sea surface temperature anomalies of the tropical Oceans (especially over the northern Indian and the equatorial Pacific Oceans) compared to the same teleconnections from fixed length seasons over the IMS. It should be noted that the IMS show significant spatial heterogeneity in these teleconnections
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1530-261X
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1069
Permanent link to this record
Author
Yu, P
Title
Development of New Techniques for Assimilating Satellite Altimetry Data into Ocean Models
Type
$loc['typeManuscript']
Year
2006
Publication
Abbreviated Journal
Volume
Issue
Pages
Keywords
Data Assimilation, Reduced Space, First Baroclinic Mode, Ocean Models, Vertical Normal Mode Decomposition, Variational
Abstract
State of the art fully three-dimensional ocean models are very computationally expensive and their adjoints are even more resource intensive. However, many features of interest are approximated by the first baroclinic mode over much of the ocean, especially in the lower and mid latitude regions. Based on this dynamical feature, a new type of data assimilation scheme to assimilate sea surface height (SSH) data, a reduced-space adjoint technique, is developed and implemented with a three-dimensional model using vertical normal mode decomposition. The technique is tested with the Navy Coastal Ocean Model (NCOM) configured to simulate the Gulf of Mexico. The assimilation procedure works by minimizing the cost function, which generalizes the misfit between the observations and their counterpart model variables. The “forward” model is integrated for the period during which the data are assimilated. Vertical normal mode decomposition retrieves the first baroclinic mode, and the data misfit between the model outputs and observations is calculated. Adjoint equations based on a one-active-layer reduced gravity model, which approximates the first baroclinic mode, are integrated backward in time to get the gradient of the cost function with respect to the control variables (velocity and SSH of the first baroclinic mode). The gradient is input to an optimization algorithm (the limited memory Broyden-Fletcher-Goldfarb-Shanno (BFGS) method is used for the cases presented here) to determine the new first baroclinic mode velocity and SSH fields, which are used to update the forward model variables at the initial time. Two main issues in the area of ocean data assimilation are addressed: 1. How can information provided only at the sea surface be transferred dynamically into deep layers? 2. How can information provided only locally, in limited oceanic regions, be horizontally transferred to ocean areas far away from the data-dense regions, but dynamically connected to it? The first problem is solved by the use of vertical normal mode decomposition, through which the vertical dependence of model variables is obtained. Analyses show that the first baroclinic mode SSH represents the full SSH field very closely in the model test domain, with a correlation of 93% in one of the experiments. One common way to solve the second issue is to lengthen the assimilation window in order to allow the dynamic model to propagate information to the data-sparse regions. However, this dramatically increases the computational cost, since many oceanic features move very slowly. An alternative solution to this is developed using a mapping method based on complex empirical orthogonal functions (EOF), which utilizes data from a much longer period than the assimilation cycle and deals with the information in space and time simultaneously. This method is applied to map satellite altimeter data from the ground track observation locations and times onto a regular spatial and temporal grid. Three different experiments are designed for testing the assimilation technique: two experiments assimilate SSH data produced from a model run to evaluate the method, and in the last experiment the technique is applied to TOPEX/Poseidon and Jason-1 altimeter data. The assimilation procedure converges in all experiments and reduces the error in the model fields. Since the adjoint, or “backward”, model is two-dimensional, the method is much more computationally efficient than if it were to use a fully three-dimensional backward model.
Address
Department of Oceanography
Corporate Author
Thesis
$loc['Ph.D. thesis']
Publisher
Florida State University
Place of Publication
Tallahassee, FL
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
Expedition
Conference
Funding
NSF, ONR, NASA
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
589
Permanent link to this record
Author
Yu, P. ; Morey, S. L. ; O'Brien, J. J.
Title
Development of new techniques for assimilating satellite altimetry data into ocean models
Type
$loc['typeReport']
Year
2006
Publication
Abbreviated Journal
Volume
Issue
Pages
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
World Meteorological Organization
Place of Publication
Geneva, Switzerland
Editor
Cote, J.
Language
Summary Language
Original Title
Series Editor
Series Title
Research Activities in Atmospheric and Ocean Modeling, Report No. 36
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
927
Permanent link to this record
Author
Yu, P. ; Morey, S. L. ; O'Brien, J. J.
Title
Development of a reduced space adjoint data assimilation technique for numerical simulation of oceanic circulation
Type
$loc['typeReport']
Year
2004
Publication
Abbreviated Journal
Volume
Issue
Pages
08.21-08.22
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
World Meteorological Organization
Place of Publication
Geneva, Switzerland
Editor
Cote, J.
Language
Summary Language
Original Title
Series Editor
Series Title
Research Activities in Atmospheric and Ocean Modeling, Report No. 34
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
894
Permanent link to this record
Author
Yu, P. ; Morey, S. L. ; Zavala-Hidalgo, J.
Title
New mapping method to observe propagating features
Type
$loc['typeMagazine Article']
Year
2004
Publication
Sea Technology
Abbreviated Journal
Volume
45
Issue
5
Pages
20-24
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
Expedition
Conference
Funding
NOAA, NASA, ONR
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
885
Permanent link to this record
Author
Yu, P. ; Morey, S.L. ; O'Brien, J.J.
Title
A reduced-dynamics variational approach for the assimilation of altimeter data into eddy-resolving ocean models
Type
$loc['typeJournal Article']
Year
2009
Publication
Ocean Modelling
Abbreviated Journal
Ocean Modelling
Volume
27
Issue
3-4
Pages
215-229
Keywords
Ocean modeling ; Data assimilation ; Variational adjoint methods
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1463-5003
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
400
Permanent link to this record
Author
Yu, P ; Zavala-Hidalgo, J ; Morey, SL ; O'Brien, JJ
Title
A new mapping method for propagating data
Type
$loc['typeConference Article']
Year
2003
Publication
OCEANS 2003 MTS/IEEE: Celebrating the Past... Teaming toward the Future
Abbreviated Journal
Volume
Issue
Pages
2804-2807
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
Expedition
Conference
MTS/IEEE Conference on Celebrating the Past - Teaming Toward the Future
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
488
Permanent link to this record
Author
Zamudio, L. ; Hogan, P. ; Metzger, E.J.
Title
Summer generation of the Southern Gulf of California eddy train
Type
$loc['typeJournal Article']
Year
2008
Publication
Journal of Geophysical Research
Abbreviated Journal
J. Geophys. Res.
Volume
113
Issue
C6
Pages
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
0148-0227
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
410
Permanent link to this record