Dominant modes of interannual variability in precipitation over the Hengduan Mountains during rainy seasons,International Journal of Climatology

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Dominant modes of interannual variability in precipitation over the Hengduan Mountains during rainy seasons
International Journal of Climatology ( IF 3.5 ) Pub Date : 2020-12-29 , DOI: 10.1002/joc.6990
Weichen Tao ₁ , Gang Huang _{1,

2,

3} , Danhong Dong ₁ , Pengfei Wang _{1,

4} , Ting Yu ₅ , Hainan Gong ₄

Affiliation

Present study investigates the dominant modes of interannual variability in precipitation over the Hengduan Mountains (HM) during rainy seasons. The leading two empirical orthogonal function (EOF) modes of HM precipitation explain 28.4 and 13.9% of the total variance, respectively. Positive EOF1 phase features enhanced precipitation anomalies over the southern HM, and a dipole structure with wet anomalies occupying large areas from the YunGui plateau to Tibetan Plateau is observed in positive EOF2 phase. Analysis of moisture budget and omega equation indicate the importance of leading EOF modes related circulation anomalies, which bring the horizontal warm advection to the HM, favouring the anomalous upward motions and precipitation increase there. For EOF1, the HM is controlled by an anomalous quasi‐barotropic cyclone. This cyclone is one part of a zonally oriented barotropic wave‐like pattern highly resembling the Silk Road pattern. Besides, the SST anomalies over the Indo‐Pacific sector are similar to the decaying phase of La Niña, which induces the wet anomalies and further triggers the anomalous lower‐level cyclone as a Rossby wave response. For EOF2, an anomalous cyclone appears over the Northeast Asia from lower to upper levels, and southerly wind anomalies prevail over the HM. The North Atlantic Oscillation and its coupled tripole SST pattern trigger a zonal wave‐like pattern at middle and high latitudes emanating from the Central Europe, across Mongolia to Northeast Asia. Moreover, the SST anomalies over the Indo‐Pacific sector resemble the developing phase of El Niño, which induces the meridional Pacific‐Japan/East Asia‐Pacific teleconnection from tropical NWP to Northeast Asia.

中文翻译：

横断山区雨季降水年际变化的主导模式

本研究调查了雨季期间横断山脉（HM）降水量年际变化的主要模式。HM降水的前两种经验正交函数（EOF）模式分别解释了总方差的28.4和13.9％。EOF1正相的特征是在HM南部降水异常增强，并且在EOF2正相中从云贵高原到青藏高原都观测到偶极子结构，且湿润异常占据了大面积区域。对水分收支和ω方程的分析表明，与环流异常相关的超前EOF模式的重要性，这使HM出现了水平暖平流，有利于HM的异常向上运动和降水增加。对于EOF1，HM是由异常准正压气旋控制的。这种旋风是高度类似于丝绸之路模式的地带性正压波状模式的一部分。此外，印度太平洋区域的海温异常与拉尼娜的衰变相类似，后者诱发了湿异常，并进一步触发了低空旋风异常，作为罗斯比波响应。对于EOF2，东北亚从上到下出现异常气旋，而HM则偏南风。北大西洋涛动及其耦合的三重SST模式触发了从中欧，蒙古到东北亚的中高纬度地区的带状波状模式。此外，印度太平洋地区的SST异常类似于厄尔尼诺现象的发展阶段，

更新日期：2021-03-09

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