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Author Nyadjro, E.S. ; Rydbeck, A.V. ; Jensen, T.G. ; Richman, J.G. ; Shriver, J.F.
Title On the Generation and Salinity Impacts of Intraseasonal Westward Jets in the Equatorial Indian Ocean Type $loc['typeJournal Article']
Year 2020 Publication Journal of Geophysical Research: Oceans Abbreviated Journal J. Geophys. Res. Oceans
Volume 125
Issue 6
Pages e2020JC016066
Keywords ndian Ocean ; intraseasonal variability ; westward Jet ; intraseasonal oscillations ; mixed layer salinity ; surface currents
Abstract While westerly winds dominate the equatorial Indian Ocean and generate the well‐known eastward flowing Wyrtki Jets during boreal spring and fall, there is evidence of a strong westward surface jet during winter that is swifter than eastward currents during that season. A weaker westward jet is found in summer. In this study, we report the occurrence, characteristics, and intraseasonal variability of this westward jet and its impact on mixed layer salinity in the equatorial Indian Ocean using the HYbrid Coordinate Ocean Model (HYCOM) reanalysis with the Navy Coupled Ocean Data Assimilation (NCODA). The westward jet typically occurs in the upper 50 m, above an eastward flowing equatorial undercurrent, with peak westward volume transport of approximately −8 Sv. The westward jet builds up gradually, decays rapidly, and is primarily forced by local intraseasonal wind stress anomalies generated by atmospheric intraseasonal convection. Westward acceleration of the jet occurs when the dominant intraseasonal westward wind anomaly is not balanced by the zonal pressure gradient (ZPG) force. The intraseasonal westward jet generates strong horizontal advection and is the leading cause of mixed layer freshening in the western equatorial Indian Ocean. Without it, a saltier mixed layer would persist and weaken any barrier layers. Existing barrier layers are strengthened following the passage of freshwater‐laden westward jets. Deceleration of the westward jet occurs when the eastward ZPG becomes increasingly important and the westward intraseasonal wind anomalies weaken. A rapid reversal of atmospheric intraseasonal convection‐driven surface winds eventually terminates the westward jet.
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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2169-9275
ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ user @
Serial 1118
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Author O'Brien, J. ; Richards, T. S. ; Davis, A. C.
Title The effect of El Nino on U.S. landfalling hurricanes Type $loc['typeMagazine Article']
Year 1996 Publication Bulletin of the American Meteorological Society Abbreviated Journal
Volume 77
Issue 4
Pages 773-774
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Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @
Serial 715
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Author O'Brien, J. J. ; Bourassa, M. A.
Title Scatterometry at COAPS Type $loc['typeConference Article']
Year 2000 Publication Proceedings of the Ocean Vector Wind Science Team Meeting, Arcadia, CA, USA Abbreviated Journal
Volume Issue Pages
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Funding Approved $loc['no']
Call Number COAPS @ mfield @
Serial 803
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Author O'Brien, J. J. ; Bourassa, M. A. ; Smith, S. R.
Title Climate variability in ocean surface turbulent fluxes Type $loc['typeReport']
Year 2005 Publication Abbreviated Journal
Volume Issue Pages 214-219
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Corporate Author Thesis
Publisher NOAA Office of Climate Observation
Place of Publication Silver Spring, MD, 20910. USA
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Language Summary Language Original Title
Series Editor Series Title Annual Report: The State of the Ocean and the Ocean Observing System for Climate
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ISSN ISBN Medium
Area Expedition Conference
Funding NOAA
Approved $loc['no']
Call Number COAPS @ mfield @
Serial 911
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Author O'Brien, J. J. ; Bourassa, M. A. ; Smith, S. R.
Title U.S. research vessel surface meteorology data assembly center Type $loc['typeReport']
Year 2005 Publication Abbreviated Journal
Volume Issue Pages 221-228
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Abstract
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Corporate Author Thesis
Publisher NOAA Office of Climate Observation
Place of Publication Silver Spring, MD, 20910. USA
Editor
Language Summary Language Original Title
Series Editor Series Title Annual Report: The State of the Ocean and the Ocean Observing System for Climate
Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Funding NOAA
Approved $loc['no']
Call Number COAPS @ mfield @
Serial 912
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Author O'Brien, J. J. ; Zierden, D. F. ; Griffin, M.
Title Long-term Forecasting of Wildfire season severity in Florida Type $loc['typeReport']
Year 2002 Publication Abbreviated Journal
Volume Issue Pages 42
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Publisher Center for Ocean-Atmospheric Prediction Studies, Florida State University
Place of Publication Tallahassee, FL
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Series Editor Series Title Technical Report 02-2
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ISSN ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @
Serial 856
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Author O'Brien, JJ ; Richards, TS ; Davis, AC
Title The effect of El Nino on US landfalling hurricanes Type $loc['typeJournal Article']
Year 1996 Publication Bulletin of the American Meteorological Society Abbreviated Journal
Volume 77
Issue 4
Pages 773-774
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 547
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Author O'hara, S. H. ; Arko, R. A. ; Clark, D. ; Chandler, C. L. ; Elya, J. L. ; Ferrini, V. L. ; McLain, K. ; Olson, C. J. ; Sellers, C. J. ; Smith, S. R. ; Stocks, K. I. ; Stolp, L. ; Carbotte, S. M.
Title Rolling Deck to Repository (R2R) Program Data Services for the Oceanographic Research Community Type $loc['typeJournal Article']
Year 2018 Publication American Geophysical Union Abbreviated Journal
Volume Issue Pages
Keywords 4299 General or miscellaneous, OCEANOGRAPHY: GENERAL
Abstract Research vessels supported by NSF are critical platforms contributing to academic oceanographic research in the US. The “underway” data sets obtained from the continuously operating geophysical, water column, and meteorological sensors aboard these vessels provide characterization of basic environmental conditions for the oceans and are of high scientific value for building global syntheses, climatologies, and historical time series of ocean properties (e.g the World Ocean Atlas, the GMRT bathymetric synthesis, ICOADS). The Rolling deck to Repository program (www.rvdata.us) provides a central shore-side data gateway that ensures the basic documentation, assessment and submission of all environmental data from ship operators to the NOAA long-term archives for these data.
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Series Editor Series Title Abbreviated Series Title
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Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ user @
Serial 1006
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Author O'hara, S. H. ; Arko, R. A. ; Clark, D. ; Chandler, C. L. ; Elya, J. L. ; Ferrini, V. L. ; McLain, K. ; Olson, C. J. ; Sellers, C. J. ; Smith, S. R. ; Stocks, K. I. ; Stolp, L. ; Carbotte, S. M.
Title Rolling Deck to Repository (R2R) Program Data Services for the Oceanographic Research Community Type $loc['typeAbstract']
Year 2018 Publication American Geophysical Union Abbreviated Journal AGU
Volume American Geophysical Union, Fall Meeting 2018
Issue Pages
Keywords OCEANOGRAPHY: GENERAL
Abstract Research vessels supported by NSF are critical platforms contributing to academic oceanographic research in the US. The “underway” data sets obtained from the continuously operating geophysical, water column, and meteorological sensors aboard these vessels provide characterization of basic environmental conditions for the oceans and are of high scientific value for building global syntheses, climatologies, and historical time series of ocean properties (e.g the World Ocean Atlas, the GMRT bathymetric synthesis, ICOADS). The Rolling deck to Repository program (www.rvdata.us) provides a central shore-side data gateway that ensures the basic documentation, assessment and submission of all environmental data from ship operators to the NOAA long-term archives for these data. R2R provides a set of data services for the oceanographic research community, including: publishing an online, searchable and browsable master cruise catalog, supported by cruise and data set DOIs; organizing, archiving, and disseminating original underway data and documents; assessing data quality on select data types; creating select post-field data products; and supporting at-sea event logging. In this presentation we will discuss new developments in R2R data services and challenges associated with ship-based data management. A significant challenge is the dramatic increase in data volumes associated with new sensors (e.g. the EK80 Sonar systems) whereby individual cruise distributions can be several terabytes. Ship operators, R2R and NCEI must design a way to move and store these growing volumes. R2R is also working to make information more accessible and complete. A new website has been launched along with API web services that allow users to find and use data more easily. R2R is working to improve device metadata, including working to identify the time sources for all environmental sensors to support accurate comparison and merging of data sets.
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Publisher Place of Publication Editor
Language Summary Language Original Title
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ISSN ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ user @
Serial 1020
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Author Pantina, P
Title Characterizing the Variability of the Indian Monsoon: Changes in Evaporative Sources for Summertime Rainfall Events Type $loc['typeManuscript']
Year 2010 Publication Abbreviated Journal
Volume Issue Pages
Keywords Variability, Trajectories, India, Monsoon, Evaporative Source, Moisture Source
Abstract This study focuses on the interannual and intraseasonal variability of evaporative sources for rainfall events during the Indian monsoon. The monsoon is an important part of the economy and lifestyle in India, thus, any improvements in our understanding of its mechanisms would be directly beneficial to society. We first discuss the use of evaporative sources for rainfall events as an important tool to help increase our knowledge of the variations of the monsoon. We then outline the variability of the monsoon on an interannual (wet and dry years) and intraseasonal (active and break periods) time scale. We use three reanalyses (NCEP-R2, CFSR, and MERRA) and an IMD gridded rainfall dataset to trace the location and strength of evaporative sources via a quasi-isentropic back trajectory program. The program uses reanalysis winds and evaporation, among other parameters, to estimate these sources back in time. We discuss the differences in parameters between the datasets on a seasonal, interannual, and intraseasonal time scale. We then thoroughly investigate the strength and location of evaporative sources between datasets on interannual and intraseasonal time scales, and we attempt to explain the variations by analyzing the differences in the input parameters and circulation mechanisms themselves. The study finds that the evaporative sources for given interannual or intraseasonal rainfall events do vary in strength and location. Interannually, the strongest change in evaporative source occurs over central India and the Arabian Sea, suggesting that the overall monsoon flow contributes moisture for Indian rainfall on this time scale. Intraseasonally, the strongest change in evaporative source occurs over the Bay of Bengal, suggesting that low pressure systems contribute moisture for Indian rainfall on this time scale. All three reanalyses yield similar fields of evaporative source. We conclude that accurate prediction of the Indian monsoon requires improved understanding of both interannual and intraseasonal oscillations since the sources of moisture for these events are unique.
Address Department of Earth Ocean and Atmospheric Science
Corporate Author Thesis $loc['Master's thesis']
Publisher Florida State University
Place of Publication Tallahassee, FL
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Language Summary Language Original Title
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ISSN ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @
Serial 577
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