doi:  10.3878/j.issn.1006-9895.1804.18112
夏季亚洲高空急流纬向非对称变异与北大西洋海温和欧亚陆面热力异常的可能联系

Zonally Asymmetric Variation of Summer Asian Upper-tropospheric Jet and its possible association with North Atlantic SSTA and Eurasian Land Surface Thermal Anomaly
摘要点击 919  全文点击 172  投稿时间:2018-01-21  修订日期:2018-03-30
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基金:  (41230422、41625019、41405068)
中文关键词:  夏季亚洲高空急流  纬向非对称变异 北大西洋海温三级子  欧亚陆面热力异常
英文关键词:  Summer  Asian upper-tropospheric  Jet, Zonally  asymmetric variation, North  Atlantic SSTA  tripole, Eurasian  land surface  thermal anomaly
           
作者中文名作者英文名单位
梅一清meiyiqing南京信息工程大学气象灾害预报预警与评估协同创新中心
陈海山chenhaishan南京信息工程大学大气科学学院;南京信息工程大学气象灾害预报预警与评估协同创新中心
刘鹏南京信息工程大学大气科学学院;南京信息工程大学气象灾害预报预警与评估协同创新中心
李笛中国气象局成都高原气象研究所/高原与盆地暴雨旱涝灾害四川省重点实验室;中国气象局成都高原气象研究所/高原与盆地暴雨旱涝灾害四川省重点实验室
引用:梅一清,陈海山,刘鹏,李笛.2018.夏季亚洲高空急流纬向非对称变异与北大西洋海温和欧亚陆面热力异常的可能联系[J].大气科学
Citation:meiyiqing,chenhaishan.2018.Zonally Asymmetric Variation of Summer Asian Upper-tropospheric Jet and its possible association with North Atlantic SSTA and Eurasian Land Surface Thermal Anomaly[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      基于1979-2015年ERA-Interim再分析资料,分析了夏季亚洲高空急流纬向非对称变异特征及其可能的外强迫因子。研究发现夏季亚洲200hPa纬向风异常EOF第二模态(方差贡献为16.4%)主要表现出了急流纬向非对称的空间异常形态,反映了西亚和东亚区域急流南北偏移的反位相变化。通过进一步的诊断分析,我们发现急流纬向非对称变异与北大西洋海温和欧亚陆面热力异常可能存在一定的联系。北大西洋三级型海温异常会激发出向下游传播的异常波列,夏季该波列在欧亚大陆上空的异常环流中心与急流纬向非对称相关的异常环流中心对应一致,其中东欧平原的异常反气旋和巴尔喀什湖附近的异常气旋对西亚急流变化存在影响,东亚地区急流的变化与贝加尔湖北部异常气旋和贝加尔湖南部的异常反气旋有关。对比欧亚土壤湿度关键区内气候态和垂直环流,陆面热力异常可能会改变局地环流进而影响急流变异,且这种影响存在区域差异。
Abstract:
      Based on the ERA-Interim reanalysis data during 1979-2015, the zonally-asymmetric variation of summer Asian upper-tropospheric jet and its possible external forcing factors were analyzed. The second empirical orthogonal functions mode of summer Asian 200-hPa zonal wind anomalies, which accounts for 16.4% of total variance, is characterized by the zonally asymmetric spatial distribution. The mode reflects the out-of phase change of meridional displacement of jet over West Asia and East Asia. The North Atlantic sea surface temperature anomalies (SSTA) and the Eurasian surface thermal anomalies may have a linkage with the zonally asymmetric variation. The North Atlantic SSTA tripole pattern in spring can stimulate a downstream wave train, sharing consistent anomalous circulation centers over Eurasian in summer with the zonally-asymmetric variation of Asian jet. The anomalous anticyclonic circulation around east European Plain and anomalous cyclonic circulation around Balkhash?Lake related to the wave train could affect West Asian jet. In addition, the East Asian jet is correlated well with the anomalous cyclonic circulation to the north of Lake Baikal and anomalous anticyclonic circulation to the south. Land surface thermal anomaly may also change the local circulation and affect the jet variation by modulating vertical motion and land-atmosphere interaction over soil moisture key areas and the impacts are regional different.
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