Effect of El Niño/La Niña on tropical easterly jet stream during Asian summer monsoon season
ABSTRACT The influence of El Niño/La Niña on the upper‐tropospheric circulation pattern, especially on tropical easterly jet stream (TEJ) over the Asian summer monsoon region, has been studied using ECMWF Reanalysis (ERA) Interim Data for a period of 34 years (1980–2013). The TEJ shows distinctive f...
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| Veröffentlicht in: | International journal of climatology 2017-12, Vol.37 (15), p.4994-5004 |
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| creator | Nithya, K. Manoj, M. G. Mohankumar, K. |
| description | ABSTRACT
The influence of El Niño/La Niña on the upper‐tropospheric circulation pattern, especially on tropical easterly jet stream (TEJ) over the Asian summer monsoon region, has been studied using ECMWF Reanalysis (ERA) Interim Data for a period of 34 years (1980–2013). The TEJ shows distinctive features during El Niño and La Niña events. The intensity of the TEJ increases and it spreads horizontally and vertically during La Niña years, whereas it weakens and shrinks spatially in El Niño years. Walker circulation over the summer monsoon region shows strong easterlies in La Niña events accompanied with vertically enhanced zonal flow. Lower level (∼850 hPa) convergence as well as upper level (∼150 hPa) divergence is strong in La Niña events and a westward shift of divergence centre is also observed in these years. A strong (weak) anticyclonic flow at upper levels at about 150 hPa is prominent during La Niña (El Niño) years over the Tibetan region causing significant inter‐annual variability of the TEJ.
Tropical easterly jet (m s−1) composites from 15°S to 35°N latitude and 20° and 130°E longitude for (a) El Niño, (b) La Niña and (c) climatology of TEJ from 1980 to 2013 (34 years). |
| doi_str_mv | 10.1002/joc.5137 |
| format | Article |
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The influence of El Niño/La Niña on the upper‐tropospheric circulation pattern, especially on tropical easterly jet stream (TEJ) over the Asian summer monsoon region, has been studied using ECMWF Reanalysis (ERA) Interim Data for a period of 34 years (1980–2013). The TEJ shows distinctive features during El Niño and La Niña events. The intensity of the TEJ increases and it spreads horizontally and vertically during La Niña years, whereas it weakens and shrinks spatially in El Niño years. Walker circulation over the summer monsoon region shows strong easterlies in La Niña events accompanied with vertically enhanced zonal flow. Lower level (∼850 hPa) convergence as well as upper level (∼150 hPa) divergence is strong in La Niña events and a westward shift of divergence centre is also observed in these years. A strong (weak) anticyclonic flow at upper levels at about 150 hPa is prominent during La Niña (El Niño) years over the Tibetan region causing significant inter‐annual variability of the TEJ.
Tropical easterly jet (m s−1) composites from 15°S to 35°N latitude and 20° and 130°E longitude for (a) El Niño, (b) La Niña and (c) climatology of TEJ from 1980 to 2013 (34 years).</description><identifier>ISSN: 0899-8418</identifier><identifier>EISSN: 1097-0088</identifier><identifier>DOI: 10.1002/joc.5137</identifier><language>eng</language><publisher>Chichester, UK: John Wiley & Sons, Ltd</publisher><subject>Annual variations ; Asian summer monsoon ; Circulation patterns ; Divergence ; El Nino ; El Nino phenomena ; El Niño/La Niña ; Interannual variability ; Jet stream ; Jet streams (meteorology) ; La Nina ; La Nina events ; Monsoon circulation ; Monsoons ; Ocean currents ; Rivers ; Stream function ; Summer ; Summer monsoon ; Tropical climate ; Tropical easterly jet ; Tropical easterly jet stream ; Tropospheric circulation ; Upper level divergence ; Velocity potential ; Walker circulation ; Weather forecasting ; Wind ; Zonal flow ; Zonal flow (meteorology)</subject><ispartof>International journal of climatology, 2017-12, Vol.37 (15), p.4994-5004</ispartof><rights>2017 Royal Meteorological Society</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c2937-ead5c0610f154e11c215078e9aac7025a89c078dfe9f86457f9d07fa0335102c3</citedby><cites>FETCH-LOGICAL-c2937-ead5c0610f154e11c215078e9aac7025a89c078dfe9f86457f9d07fa0335102c3</cites><orcidid>0000-0001-8415-0636</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2Fjoc.5137$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2Fjoc.5137$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,27923,27924,45573,45574</link.rule.ids></links><search><creatorcontrib>Nithya, K.</creatorcontrib><creatorcontrib>Manoj, M. G.</creatorcontrib><creatorcontrib>Mohankumar, K.</creatorcontrib><title>Effect of El Niño/La Niña on tropical easterly jet stream during Asian summer monsoon season</title><title>International journal of climatology</title><description>ABSTRACT
The influence of El Niño/La Niña on the upper‐tropospheric circulation pattern, especially on tropical easterly jet stream (TEJ) over the Asian summer monsoon region, has been studied using ECMWF Reanalysis (ERA) Interim Data for a period of 34 years (1980–2013). The TEJ shows distinctive features during El Niño and La Niña events. The intensity of the TEJ increases and it spreads horizontally and vertically during La Niña years, whereas it weakens and shrinks spatially in El Niño years. Walker circulation over the summer monsoon region shows strong easterlies in La Niña events accompanied with vertically enhanced zonal flow. Lower level (∼850 hPa) convergence as well as upper level (∼150 hPa) divergence is strong in La Niña events and a westward shift of divergence centre is also observed in these years. A strong (weak) anticyclonic flow at upper levels at about 150 hPa is prominent during La Niña (El Niño) years over the Tibetan region causing significant inter‐annual variability of the TEJ.
Tropical easterly jet (m s−1) composites from 15°S to 35°N latitude and 20° and 130°E longitude for (a) El Niño, (b) La Niña and (c) climatology of TEJ from 1980 to 2013 (34 years).</description><subject>Annual variations</subject><subject>Asian summer monsoon</subject><subject>Circulation patterns</subject><subject>Divergence</subject><subject>El Nino</subject><subject>El Nino phenomena</subject><subject>El Niño/La Niña</subject><subject>Interannual variability</subject><subject>Jet stream</subject><subject>Jet streams (meteorology)</subject><subject>La Nina</subject><subject>La Nina events</subject><subject>Monsoon circulation</subject><subject>Monsoons</subject><subject>Ocean currents</subject><subject>Rivers</subject><subject>Stream function</subject><subject>Summer</subject><subject>Summer monsoon</subject><subject>Tropical climate</subject><subject>Tropical easterly jet</subject><subject>Tropical easterly jet stream</subject><subject>Tropospheric circulation</subject><subject>Upper level divergence</subject><subject>Velocity potential</subject><subject>Walker circulation</subject><subject>Weather forecasting</subject><subject>Wind</subject><subject>Zonal flow</subject><subject>Zonal flow (meteorology)</subject><issn>0899-8418</issn><issn>1097-0088</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp1kNFKwzAUhoMoOKfgIwS88abbOW3TJJdjzKkMd6O3lpAm0tI2M2mRPZbP4IuZbd56df4D33cO_ITcIswQIJ03Ts8YZvyMTBAkTwCEOCcTEFImIkdxSa5CaABASiwm5H1lrdEDdZauWvpS_3y7-UYdg6Kup4N3u1qrlhoVBuPbPW3MQMPgjepoNfq6_6CLUKuehrHrjKed64OLYoiC66_JhVVtMDd_c0reHlavy8dks10_LRebRKcy44lRFdNQIFhkuUHUKTLgwkilNIeUKSF13CtrpBVFzriVFXCrIMsYQqqzKbk73d159zmaMJSNG30fX5YoOeQSCl5E6v5Eae9C8MaWO193yu9LhPLQXrR0eWgvoskJ_apbs_-XK5-3yyP_CznLcOY</recordid><startdate>201712</startdate><enddate>201712</enddate><creator>Nithya, K.</creator><creator>Manoj, M. G.</creator><creator>Mohankumar, K.</creator><general>John Wiley & Sons, Ltd</general><general>Wiley Subscription Services, Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><orcidid>https://orcid.org/0000-0001-8415-0636</orcidid></search><sort><creationdate>201712</creationdate><title>Effect of El Niño/La Niña on tropical easterly jet stream during Asian summer monsoon season</title><author>Nithya, K. ; Manoj, M. G. ; Mohankumar, K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c2937-ead5c0610f154e11c215078e9aac7025a89c078dfe9f86457f9d07fa0335102c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Annual variations</topic><topic>Asian summer monsoon</topic><topic>Circulation patterns</topic><topic>Divergence</topic><topic>El Nino</topic><topic>El Nino phenomena</topic><topic>El Niño/La Niña</topic><topic>Interannual variability</topic><topic>Jet stream</topic><topic>Jet streams (meteorology)</topic><topic>La Nina</topic><topic>La Nina events</topic><topic>Monsoon circulation</topic><topic>Monsoons</topic><topic>Ocean currents</topic><topic>Rivers</topic><topic>Stream function</topic><topic>Summer</topic><topic>Summer monsoon</topic><topic>Tropical climate</topic><topic>Tropical easterly jet</topic><topic>Tropical easterly jet stream</topic><topic>Tropospheric circulation</topic><topic>Upper level divergence</topic><topic>Velocity potential</topic><topic>Walker circulation</topic><topic>Weather forecasting</topic><topic>Wind</topic><topic>Zonal flow</topic><topic>Zonal flow (meteorology)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Nithya, K.</creatorcontrib><creatorcontrib>Manoj, M. G.</creatorcontrib><creatorcontrib>Mohankumar, K.</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>International journal of climatology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Nithya, K.</au><au>Manoj, M. G.</au><au>Mohankumar, K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of El Niño/La Niña on tropical easterly jet stream during Asian summer monsoon season</atitle><jtitle>International journal of climatology</jtitle><date>2017-12</date><risdate>2017</risdate><volume>37</volume><issue>15</issue><spage>4994</spage><epage>5004</epage><pages>4994-5004</pages><issn>0899-8418</issn><eissn>1097-0088</eissn><abstract>ABSTRACT
The influence of El Niño/La Niña on the upper‐tropospheric circulation pattern, especially on tropical easterly jet stream (TEJ) over the Asian summer monsoon region, has been studied using ECMWF Reanalysis (ERA) Interim Data for a period of 34 years (1980–2013). The TEJ shows distinctive features during El Niño and La Niña events. The intensity of the TEJ increases and it spreads horizontally and vertically during La Niña years, whereas it weakens and shrinks spatially in El Niño years. Walker circulation over the summer monsoon region shows strong easterlies in La Niña events accompanied with vertically enhanced zonal flow. Lower level (∼850 hPa) convergence as well as upper level (∼150 hPa) divergence is strong in La Niña events and a westward shift of divergence centre is also observed in these years. A strong (weak) anticyclonic flow at upper levels at about 150 hPa is prominent during La Niña (El Niño) years over the Tibetan region causing significant inter‐annual variability of the TEJ.
Tropical easterly jet (m s−1) composites from 15°S to 35°N latitude and 20° and 130°E longitude for (a) El Niño, (b) La Niña and (c) climatology of TEJ from 1980 to 2013 (34 years).</abstract><cop>Chichester, UK</cop><pub>John Wiley & Sons, Ltd</pub><doi>10.1002/joc.5137</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0001-8415-0636</orcidid></addata></record> |
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| subjects | Annual variations Asian summer monsoon Circulation patterns Divergence El Nino El Nino phenomena El Niño/La Niña Interannual variability Jet stream Jet streams (meteorology) La Nina La Nina events Monsoon circulation Monsoons Ocean currents Rivers Stream function Summer Summer monsoon Tropical climate Tropical easterly jet Tropical easterly jet stream Tropospheric circulation Upper level divergence Velocity potential Walker circulation Weather forecasting Wind Zonal flow Zonal flow (meteorology) |
| title | Effect of El Niño/La Niña on tropical easterly jet stream during Asian summer monsoon season |
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