Why precipitation has reduced in North China
Based on Reanalysis datasets from NCEP/NCAR and summer rainfall datasets from China National Climate Center (NCC), by using trend analysis and composite analysis methods, the reasons causing summer precipitation in North China to reduce was investigated. The results show that summer rainfall in Nort...
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creator | Lisheng Hao Jinzhong Min |
description | Based on Reanalysis datasets from NCEP/NCAR and summer rainfall datasets from China National Climate Center (NCC), by using trend analysis and composite analysis methods, the reasons causing summer precipitation in North China to reduce was investigated. The results show that summer rainfall in North China had a significant decreasing tendency, especially true since 1965 in which an abrupt change occurred. The northern hemisphere atmospheric circulation at 500 hPa had a remarkable change after 1965, from outstanding meridional circulation to outstanding zonal circulation, leading to upper trough activity to decrease, resulting in the rainfall weather processes caused by upward motion behind trough significantly to reduce. At 500 hPa in Mongolian region, air temperature decreased, resulting in lower troposphere pressure to increase, leading to low pressure activity significantly to decrease and rainfall weather processes influencing North China to reduce. At the same time, the decreased air temperature in 500hPa would caused the upper troposphere geopotential height to reduce, resulting in high-altitude jet southerly location, the East Asian summer monsoon to weaken, then it was difficult for water vapor transport to cross the Yangtze River valley and reach the North China region, with a southerly summer monsoon rainfall zone. The summer precipitation reduction in North China had a good correlation with the northern hemispheric circulation changes. |
doi_str_mv | 10.1109/RSETE.2011.5964433 |
format | Conference Proceeding |
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The results show that summer rainfall in North China had a significant decreasing tendency, especially true since 1965 in which an abrupt change occurred. The northern hemisphere atmospheric circulation at 500 hPa had a remarkable change after 1965, from outstanding meridional circulation to outstanding zonal circulation, leading to upper trough activity to decrease, resulting in the rainfall weather processes caused by upward motion behind trough significantly to reduce. At 500 hPa in Mongolian region, air temperature decreased, resulting in lower troposphere pressure to increase, leading to low pressure activity significantly to decrease and rainfall weather processes influencing North China to reduce. At the same time, the decreased air temperature in 500hPa would caused the upper troposphere geopotential height to reduce, resulting in high-altitude jet southerly location, the East Asian summer monsoon to weaken, then it was difficult for water vapor transport to cross the Yangtze River valley and reach the North China region, with a southerly summer monsoon rainfall zone. The summer precipitation reduction in North China had a good correlation with the northern hemispheric circulation changes.</description><identifier>ISBN: 9781424491728</identifier><identifier>ISBN: 142449172X</identifier><identifier>EISBN: 1424491703</identifier><identifier>EISBN: 9781424491711</identifier><identifier>EISBN: 1424491711</identifier><identifier>EISBN: 9781424491704</identifier><identifier>DOI: 10.1109/RSETE.2011.5964433</identifier><language>eng</language><publisher>IEEE</publisher><subject>anomaly ; atmospheric circulation ; Convergence ; Europe ; North China ; Ocean temperature ; reduction ; Rivers ; summer precipitation ; Terrestrial atmosphere ; Wind speed</subject><ispartof>2011 International Conference on Remote Sensing, Environment and Transportation Engineering, 2011, p.940-943</ispartof><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/5964433$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>309,310,780,784,789,790,2058,27925,54920</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/5964433$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc></links><search><creatorcontrib>Lisheng Hao</creatorcontrib><creatorcontrib>Jinzhong Min</creatorcontrib><title>Why precipitation has reduced in North China</title><title>2011 International Conference on Remote Sensing, Environment and Transportation Engineering</title><addtitle>RSETE</addtitle><description>Based on Reanalysis datasets from NCEP/NCAR and summer rainfall datasets from China National Climate Center (NCC), by using trend analysis and composite analysis methods, the reasons causing summer precipitation in North China to reduce was investigated. The results show that summer rainfall in North China had a significant decreasing tendency, especially true since 1965 in which an abrupt change occurred. The northern hemisphere atmospheric circulation at 500 hPa had a remarkable change after 1965, from outstanding meridional circulation to outstanding zonal circulation, leading to upper trough activity to decrease, resulting in the rainfall weather processes caused by upward motion behind trough significantly to reduce. At 500 hPa in Mongolian region, air temperature decreased, resulting in lower troposphere pressure to increase, leading to low pressure activity significantly to decrease and rainfall weather processes influencing North China to reduce. At the same time, the decreased air temperature in 500hPa would caused the upper troposphere geopotential height to reduce, resulting in high-altitude jet southerly location, the East Asian summer monsoon to weaken, then it was difficult for water vapor transport to cross the Yangtze River valley and reach the North China region, with a southerly summer monsoon rainfall zone. The summer precipitation reduction in North China had a good correlation with the northern hemispheric circulation changes.</description><subject>anomaly</subject><subject>atmospheric circulation</subject><subject>Convergence</subject><subject>Europe</subject><subject>North China</subject><subject>Ocean temperature</subject><subject>reduction</subject><subject>Rivers</subject><subject>summer precipitation</subject><subject>Terrestrial atmosphere</subject><subject>Wind speed</subject><isbn>9781424491728</isbn><isbn>142449172X</isbn><isbn>1424491703</isbn><isbn>9781424491711</isbn><isbn>1424491711</isbn><isbn>9781424491704</isbn><fulltext>true</fulltext><rsrctype>conference_proceeding</rsrctype><creationdate>2011</creationdate><recordtype>conference_proceeding</recordtype><sourceid>6IE</sourceid><sourceid>RIE</sourceid><recordid>eNo1j8tKxDAYRiMiqGNfQDd5AFtzT_6llHqBQcEZcDmkSX4a0U5J62LeXsHx2xzO5sBHyDVnDecM7t423bZrBOO80WCUkvKEXHIllAJumTwlFVj378Kdk2qeP9jvjAED6oLcvg8HOpUU8pQXv-T9SAc_05Lid0iR5pG-7Msy0HbIo78iZ-g_51QduSKbh27bPtXr18fn9n5dZ2BLjQxkLzAGjwGiSsIgcNWj09FYtL3RFp0DwX1CrcE7Z4RTCN7wPkgmV-Tmr5pTSrup5C9fDrvjPfkDBxRC3g</recordid><startdate>201106</startdate><enddate>201106</enddate><creator>Lisheng Hao</creator><creator>Jinzhong Min</creator><general>IEEE</general><scope>6IE</scope><scope>6IL</scope><scope>CBEJK</scope><scope>RIE</scope><scope>RIL</scope></search><sort><creationdate>201106</creationdate><title>Why precipitation has reduced in North China</title><author>Lisheng Hao ; Jinzhong Min</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-i90t-f093b2fdcafc9d4e26f914bf85d67f7b657f88921aef559a886284f9a61bc303</frbrgroupid><rsrctype>conference_proceedings</rsrctype><prefilter>conference_proceedings</prefilter><language>eng</language><creationdate>2011</creationdate><topic>anomaly</topic><topic>atmospheric circulation</topic><topic>Convergence</topic><topic>Europe</topic><topic>North China</topic><topic>Ocean temperature</topic><topic>reduction</topic><topic>Rivers</topic><topic>summer precipitation</topic><topic>Terrestrial atmosphere</topic><topic>Wind speed</topic><toplevel>online_resources</toplevel><creatorcontrib>Lisheng Hao</creatorcontrib><creatorcontrib>Jinzhong Min</creatorcontrib><collection>IEEE Electronic Library (IEL) Conference Proceedings</collection><collection>IEEE Proceedings Order Plan All Online (POP All Online) 1998-present by volume</collection><collection>IEEE Xplore All Conference Proceedings</collection><collection>IEEE Electronic Library (IEL)</collection><collection>IEEE Proceedings Order Plans (POP All) 1998-Present</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Lisheng Hao</au><au>Jinzhong Min</au><format>book</format><genre>proceeding</genre><ristype>CONF</ristype><atitle>Why precipitation has reduced in North China</atitle><btitle>2011 International Conference on Remote Sensing, Environment and Transportation Engineering</btitle><stitle>RSETE</stitle><date>2011-06</date><risdate>2011</risdate><spage>940</spage><epage>943</epage><pages>940-943</pages><isbn>9781424491728</isbn><isbn>142449172X</isbn><eisbn>1424491703</eisbn><eisbn>9781424491711</eisbn><eisbn>1424491711</eisbn><eisbn>9781424491704</eisbn><abstract>Based on Reanalysis datasets from NCEP/NCAR and summer rainfall datasets from China National Climate Center (NCC), by using trend analysis and composite analysis methods, the reasons causing summer precipitation in North China to reduce was investigated. The results show that summer rainfall in North China had a significant decreasing tendency, especially true since 1965 in which an abrupt change occurred. The northern hemisphere atmospheric circulation at 500 hPa had a remarkable change after 1965, from outstanding meridional circulation to outstanding zonal circulation, leading to upper trough activity to decrease, resulting in the rainfall weather processes caused by upward motion behind trough significantly to reduce. At 500 hPa in Mongolian region, air temperature decreased, resulting in lower troposphere pressure to increase, leading to low pressure activity significantly to decrease and rainfall weather processes influencing North China to reduce. At the same time, the decreased air temperature in 500hPa would caused the upper troposphere geopotential height to reduce, resulting in high-altitude jet southerly location, the East Asian summer monsoon to weaken, then it was difficult for water vapor transport to cross the Yangtze River valley and reach the North China region, with a southerly summer monsoon rainfall zone. The summer precipitation reduction in North China had a good correlation with the northern hemispheric circulation changes.</abstract><pub>IEEE</pub><doi>10.1109/RSETE.2011.5964433</doi><tpages>4</tpages></addata></record> |
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identifier | ISBN: 9781424491728 |
ispartof | 2011 International Conference on Remote Sensing, Environment and Transportation Engineering, 2011, p.940-943 |
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language | eng |
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source | IEEE Electronic Library (IEL) Conference Proceedings |
subjects | anomaly atmospheric circulation Convergence Europe North China Ocean temperature reduction Rivers summer precipitation Terrestrial atmosphere Wind speed |
title | Why precipitation has reduced in North China |
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