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Numerical Experiments on the Impact of Spring North Pacific SSTA on NPO and Unusually Cool Summers in Northeast China

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doi: 10.1007/s00376-014-3247-8

  • A set of numerical experiments designed to analyze the oceanic forcing in spring show that the combined forcing of cold (warm) El Nio (La Nia) phases in the Nio4 region and sea surface temperature anomalies (SSTA) in the westerly drifts region would result in abnormally enhanced NorthEast Cold Vortex (NECV) activities in early summer. In spring, the central equatorial Pacific El Niňo phase and westerly drift SSTA forcing would lead to the retreat of non-adiabatic waves, inducing elliptic low-frequency anomalies of tropical air flows. This would enhance the anomalous cyclone-anticyclone-cyclone-anticyclone low-frequency wave train that propagates from the tropics to the extratropics and further to the mid-high latitudes, constituting a major physical mechanism that contributes to the early summer circulation anomalies in the subtropics and in the North Pacific mid-high latitudes. The central equatorial Pacific La Niňa forcing in the spring would, on the one hand, induce teleconnection anomalies of high pressure from the Sea of Okhotsk to the Sea of Japan in early summer, and on the other hand indirectly trigger a positive low-frequency East Asia-Pacific teleconnection (EAP) wave train in the lower troposphere.
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Manuscript History

Manuscript received: 13 December 2013
Manuscript revised: 11 March 2014
通讯作者: 陈斌, bchen63@163.com
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Numerical Experiments on the Impact of Spring North Pacific SSTA on NPO and Unusually Cool Summers in Northeast China

    Corresponding author: ZHAO Bin, zhaob@cma.gov.cn
  • 1. Laboratory of Research for Middle-High Latitude Circulation Systems and East Asian Monsoon, Changchun 130062;
  • 2. Institute of Meteorological Sciences of Jilin Province, Changchun 130062;
  • 3. National Meteorological Center, Beijing 100081;
  • 4. Jilin Meteorological Science and Technology Service Center, Changchun 130062
Fund Project:  This study was supported by a National Natural Science Foundation project approved under Grant Nos. 41175083, 41275096 and 41305091, and a China Meteorological Administration special public welfare reserch funds registered under Grant Nos. GYHY201006020, GYHY 201106016, and GYHY201106015.

Abstract: A set of numerical experiments designed to analyze the oceanic forcing in spring show that the combined forcing of cold (warm) El Nio (La Nia) phases in the Nio4 region and sea surface temperature anomalies (SSTA) in the westerly drifts region would result in abnormally enhanced NorthEast Cold Vortex (NECV) activities in early summer. In spring, the central equatorial Pacific El Niňo phase and westerly drift SSTA forcing would lead to the retreat of non-adiabatic waves, inducing elliptic low-frequency anomalies of tropical air flows. This would enhance the anomalous cyclone-anticyclone-cyclone-anticyclone low-frequency wave train that propagates from the tropics to the extratropics and further to the mid-high latitudes, constituting a major physical mechanism that contributes to the early summer circulation anomalies in the subtropics and in the North Pacific mid-high latitudes. The central equatorial Pacific La Niňa forcing in the spring would, on the one hand, induce teleconnection anomalies of high pressure from the Sea of Okhotsk to the Sea of Japan in early summer, and on the other hand indirectly trigger a positive low-frequency East Asia-Pacific teleconnection (EAP) wave train in the lower troposphere.

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