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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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ISSN 2169-9275
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Funding Approved $loc['no']
Call Number COAPS @ user @
Serial 1118
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Author Karmakar, N. ; Misra, V.
Title The Relation of Intraseasonal Variations With Local Onset and Demise of the Indian Summer Monsoon Type $loc['typeJournal Article']
Year 2019 Publication Journal of Geophysical Research: Atmospheres Abbreviated Journal J. Geophys. Res. Atmos.
Volume 124
Issue 5
Pages 2483-2506
Keywords hydroclimatic, Indian Summer Monsoon, Intraseasonal Oscillations, eastern Indiawestward propagating
Abstract Two of the most important hydroclimatic features of the Indian Summer Monsoon (ISM) rainfall are its onset/demise and Intraseasonal Oscillations (ISOs) manifested by the active‐break cycles. In this study, we aim to understand the quantitative association between these two phenomena. An objective definition of local onset/demise of the ISM based on more than a century‐long India Meteorological Department (IMD) rain‐gauge observation is taken into consideration. Using multichannel singular spectrum analysis (MSSA) we isolate northward propagating low‐ (20–60 days; LF‐ISO) and northwestward propagating high‐ (10–20 days; HF‐ISO) frequency ISOs from the daily ISM rainfall. Our results suggest that a large number of local onset (59%) and demise (62%) events occur during positive developing phases and positive decaying phases of two ISOs, respectively, with phase‐locking between LF‐ISO and HF‐ISO being particularly important. Local onset is largely associated with favorable phases of ISOs across India except for LF‐ISO over eastern India and HF‐ISO over western Ghats and central India (CI). We find that local demise is more coherent with the ISO phases, especially with HF‐ISO across the domain. We performed a case study to understand large‐scale association with the onset of the ISM over CI. In 44 of total 58 cases (1948–2005), when CI onset occurred during favorable LF‐ISO or HF‐ISO phase, they are either linked with a northward propagation of convection from the equator in LF‐ISO timescale (28 cases) or westward propagating structures from the western Pacific in HF‐ISO timescale (27 cases).
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ISSN 2169-897X
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Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ user @
Serial 1014
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Author Shinoda, T. ; Han, W. ; Zamudio, L. ; Lien, R.-C. ; Katsumata, M.
Title Remote Ocean Response to the Madden-Julian Oscillation during the DYNAMO Field Campaign: Impact on Somali Current System and the Seychelles-Chagos Thermocline Ridge Type $loc['typeJournal Article']
Year 2017 Publication Atmosphere Abbreviated Journal Atmosphere
Volume 8
Issue 9
Pages 171
Keywords Madden-Julian oscillation ; CINDY/DYNAMO ; Somali current ; Indian Ocean
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Language Summary Language Original Title
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ISSN 2073-4433
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Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @
Serial 282
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Author Krishnamurti, T.N. ; Jana, S. ; Krishnamurti, R. ; Kumar, V. ; Deepa, R. ; Papa, F. ; Bourassa, M.A. ; Ali, M.M.
Title Monsoonal intraseasonal oscillations in the ocean heat content over the surface layers of the Bay of Bengal Type $loc['typeJournal Article']
Year 2017 Publication Journal of Marine Systems Abbreviated Journal Journal of Marine Systems
Volume 167
Issue Pages 19-32
Keywords Intraseasonal oscillations ; Ocean heat content ; Bay of Bengal
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Language Summary Language Original Title
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Series Volume Series Issue Edition
ISSN 0924-7963
ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @
Serial 64
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Author Podestá, G. ; Letson, D. ; Messina, C. ; Royce, F. ; Ferreyra, R.A. ; Jones, J. ; Hansen, J. ; Llovet, I. ; Grondona, M. ; O'Brien, J.J.
Title Use of ENSO-related climate information in agricultural decision making in Argentina: a pilot experience Type $loc['typeJournal Article']
Year 2002 Publication Agricultural Systems Abbreviated Journal Agricultural Systems
Volume 74
Issue 3
Pages 371-392
Keywords El Nino-Southern Oscillation ; argentine pampas ; climate forecasts ; climate-adaptive management ; linked modeling
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ISSN 0308521X
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Funding Approved $loc['no']
Call Number COAPS @ mfield @
Serial 491
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Author Izaurralde, R.C. ; Rosenberg, N.J. ; Brown, R.A. ; Legler, D.M. ; Tiscareño López, M. ; Srinivasan, R.
Title Modeled effects of moderate and strong 'Los Niños' on crop productivity in North America Type $loc['typeJournal Article']
Year 1999 Publication Agricultural and Forest Meteorology Abbreviated Journal Agricultural and Forest Meteorology
Volume 94
Issue 3-4
Pages 259-268
Keywords El Nino ; El Nino Southern Oscillation (ENSO) ; EPIC ; corn ; wheat
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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 0168-1923
ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @
Serial 530
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Author Brolley, J.M. ; O'Brien, J.J. ; Schoof, J. ; Zierden, D.
Title Experimental drought threat forecast for Florida Type $loc['typeJournal Article']
Year 2007 Publication Agricultural and Forest Meteorology Abbreviated Journal Agricultural and Forest Meteorology
Volume 145
Issue 1-2
Pages 84-96
Keywords wildfires ; Keetch-Byram drought index ; drought ; El Nino/Southern oscillation ; spectral weather generator
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
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ISSN 0168-1923
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Area Expedition Conference
Funding USDA and NOAA
Approved $loc['no']
Call Number COAPS @ mfield @
Serial 422
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Author Michael, J.-P. ; Misra, V. ; Chassignet, E.P.
Title The El Niño and Southern Oscillation in the historical centennial integrations of the new generation of climate models Type $loc['typeJournal Article']
Year 2013 Publication Regional Environmental Change Abbreviated Journal Reg Environ Change
Volume 13
Issue S1
Pages 121-130
Keywords ENSO ; CMIP5 ; El Nino ; Southern Oscillation ; Ocean-atmosphere interaction ; Climate ; Variability
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ISSN 1436-3798
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Funding Approved $loc['no']
Call Number COAPS @ mfield @
Serial 189
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Author Misra, V. ; DiNapoli, S.M. ; Bastola, S.
Title Dynamic downscaling of the twentieth-century reanalysis over the southeastern United States Type $loc['typeJournal Article']
Year 2013 Publication Regional Environmental Change Abbreviated Journal Reg Environ Change
Volume 13
Issue S1
Pages 15-23
Keywords Atlantic multi-decadal oscillation ; Hurricanes ; Pacific Decadal Oscillation
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Publisher Place of Publication Editor
Language Summary Language Original Title
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ISSN 1436-3798
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Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @
Serial 190
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Author Krishnamurthy, V. ; Misra, V.
Title Daily atmospheric variability in the South American monsoon system Type $loc['typeJournal Article']
Year 2011 Publication Climate Dynamics Abbreviated Journal Clim Dyn
Volume 37
Issue 3-4
Pages 803-819
Keywords South American monsoon ; ENSO ; Atlantic multidecadal oscillation ; Intraseasonal oscillation-MJO ; NAO
Abstract
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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 0930-7575
ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @
Serial 300
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