Influences of Large-scale Atmospheric Circulation and Local Sea Surface Temperature on Convective Activity over the Sea of Japan in December
Influences of Large-scale Atmospheric Circulation and Local Sea Surface Temperature on Convective Activity over the Sea of Japan in December
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DOI：
10.2151/sola.2008-029
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发表时间：
2008-01-01
期刊：
影响因子：
1.9
通讯作者：
Iwamoto, Katsushi
中科院分区：
文献类型：
--
作者：
Takano, Yohei;Tachibana, Yoshihiro;Iwamoto, Katsushi
利用近50年的再分析资料，从年际变化的角度分析了2005年12月日本周围冬季气候异常的特征，包括异常大雪。2005年日本海附近的异常降雪是由于日本海上空的一个异常的空气质量修改，由于日本海的温暖的热力学特征的大的变化。热力学收支分析表明，2005年12月日本海上空的空气质量变化是40多年来最强的。日本海上空的空气质量变化与500 hPa高度场正位相（SJ型）的一个大尺度南北向偶极子型（包括覆盖西伯利亚的北方高压和覆盖日本广大地区的南方低压）密切相关。此外，晚秋局地海温变率与气团改造有显著相关。然而，北极涛动是不显着相关的空气质量修改在日本海的年际时间尺度上。
The characteristics of the anomalous winter climate around Japan in December 2005, including abnormally heavy snowfall, were analyzed from the viewpoint of interannual variation using reanalysis data for 50 years. The anomalous snowfall near the Sea of Japan in 2005 is attributed to an anomalous air-mass modification over the Sea of Japan, the large changes of thermodynamic characteristics due to the warmth of the Sea of Japan. Thermodynamic budget analyses showed that the air-mass modification in December 2005 over the Sea of Japan was the strongest in more than 40 years. Air-mass modification over the Sea of Japan was strongly related with a large-scale atmospheric north-south dipole pattern consisting of a northern high covering Siberia and a southern low covering a wide area of Japan in the 500 hPa height field in the positive phase (SJ pattern). In addition, the local SST variability during late autumn was significantly related to air-mass modification. However, the Arctic Oscillation was not significantly correlated with the air-mass modification over the Sea of Japan on an interannual timescale.