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首页> 外文期刊>Climate dynamics >Dominant modes of winter precipitation variability over Central Southwest Asia and inter-decadal change in the ENSO teleconnection
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Dominant modes of winter precipitation variability over Central Southwest Asia and inter-decadal change in the ENSO teleconnection

机译：冬季降水变异性的主导模式在西南亚中部和恩索省互联网连接中的跨跨境变化

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This study contributes to an improved understanding of Central Southwest Asia (CSWA) wintertime (November-April) precipitation by analyzing the dominant spatial-temporal modes of the regional winter precipitation and examining their relationship with global sea surface temperature (SST) and large-scale atmospheric circulation fields, for 1950/51-2014/15. Empirical orthogonal function (EOF) analysis results show that the first mode (EOF-1) of winter precipitation is characterized by a mono-sign pattern, with significant links to El Nino-Southern Oscillation (ENSO). EOF-2 displays a north-south dipole related to the latitudinal shift in the jet stream position, while the west-east dipole in EOF-3 appears to be influenced by the thermal contrast between the equatorial regions and higher latitudes. Further, we focus on the interdecadal change of connection between wintertime ENSO and EOF-1 observed around the early 1980s. The relationship is weak during 1950/51-1983/84 (P1), but strong and statistically significant in 1984/85-2014/15 (P2). In P1, without the ENSO signal, EOF-1 related atmospheric circulation anomalies are confined mainly over the mid- to high-latitudes of the Northern Hemisphere, associated with the extratropical East Atlantic-Western Russia (EA-WR) teleconnection. In P2, however, a close connection to the tropical Pacific is observed that includes a pronounced SST expression similar to that of ENSO. As a result of the increased relationship between ENSO and EOF-1 in P2, the regional impact of EA-WR observed over CSWA in P1 is linearly superimposed by the anomalous hemispheric-wide atmospheric response forced by the ENSO conditions in the Pacific.
机译：这项研究有助于通过分析区域冬季降水的主导空间 - 颞态模式和与全球海面温度（SST）和大规模的关系，改善对亚洲中央西南亚（CSWA）冬季（11月至4月）冬季（11月至4月）降水的了解。大气循环领域，1950/51-2014 / 15。经验正交功能（EOF）分析结果表明，冬季沉淀的第一模式（EOF-1）的特征在于单标模式，具有与EL Nino-Southern振荡（ENSO）的显着链接。 EOF-2显示与喷射流位置的纬度偏移相关的南北偶联，而Eof-3中的西部偶极子似乎受到赤道地区和更高纬度之间的热对比的影响。此外，我们专注于冬季enso和20世纪80年代初期观察到的冬季ENSO和EOF-1之间的联系的互连变化。在1950 / 51-1983 / 84（P1）期间，这种关系弱，但在1984 / 85-2014 / 15（P2）中强大和统计学意义。在P1中，没有ENSO信号，EOF-1相关的大气循环异常主要由北半球的中高纬度，与越野东部大西洋 - 西部俄罗斯（EA-WR）电信连接有关。然而，在P2中，观察到与热带太平洋的紧密连接，其包括与ENSO类似的明显SST表达式。由于苯特索和EOF-1之间的关系增加，P1中的CSWA中观察到的EA-WR的区域影响是通过太平洋的enso病症的异常半球形的大气反应线性叠加。

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