Surface temperature-related variations in the East Asian summer monsoon during three warming stages,International Journal of Climatology

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Surface temperature-related variations in the East Asian summer monsoon during three warming stages
International Journal of Climatology ( IF 3.5 ) Pub Date : 2021-04-26 , DOI: 10.1002/joc.7153
Weizhi Huang ₁ , Yunting Qiao ₁ , Maoqiu Jian ₁

Affiliation

The global mean surface temperature has experienced different warming stages, but there is less work on discussion of the regional climate changes under the background of different global warming rates. This study investigated the surface temperature (ST)-related trends in the East Asian summer monsoon (EASM) and underlying mechanisms during three warming stages, with a view to develop a new understanding of the responses of the EASM to global warming. Based on the statistical method of piecewise linear regression (PLR) to ST anomaly time series, the ST variation process from 1958 to 2014 has been divided into three stages with different linear trends: 1958–1975 (hiatus), 1976–1997 (acceleration) and 1998–2014 (slowdown). During the first stage, accompanied by two anomalous lower-level cyclones, a weakening trend of the southerly winds over eastern China is observed. The enhanced cyclone over the Yellow Sea, with local ST cooling, is associated with the CGT-like (circumglobal teleconnection) pattern, while the other one over the Philippines can be attributed to the local sea surface temperature (SST) warming. The ST-related anomalous EASM circulation exhibits an enhanced lower-level anticyclone over the northern Philippine Sea during the second stage. The warming around Lake Baikal and the phase change of the East Atlantic/Western Russia (EAWR) pattern can weaken upper-level East Asian jet stream (EAJS) and then provide a favourable condition for the descent related to the lower-level anticyclonic anomaly. As for the third stage, the anomalous ST and related EASM circulation both display a dipole pattern. Through influencing the meridional thermal contrast and distribution of convergence over East Asia (EA), the interaction between anomalous ST and EASM circulation may be the major mechanism that results in the increased (decreased) ST and enhanced barotropic anticyclone (cyclone) over southern (northern) EA.

中文翻译：

东亚夏季风在三个变暖阶段与地表温度相关的变化

全球平均地表温度经历了不同的变暖阶段，但对不同全球变暖速率背景下区域气候变化的讨论较少。本研究调查了东亚夏季风 (EASM) 的地表温度 (ST) 相关趋势及其三个变暖阶段的潜在机制，以期对东亚夏季风对全球变暖的响应有了新的认识。基于分段线性回归（PLR）对ST异常时间序列的统计方法，将1958-2014年ST变化过程分为三个不同线性趋势的阶段：1958-1975（间断）、1976-1997（加速）和 1998-2014 年（放缓）。在第一阶段，伴随着两个异常的低层气旋，华东地区偏南风有减弱趋势。黄海上空增强的气旋，伴随着局部 ST 冷却，与 CGT 样（环全球遥相关）模式有关，而菲律宾上空的另一场气旋可归因于当地海面温度 (SST) 变暖。在第二阶段，与 ST 相关的异常 EASM 环流在菲律宾北部上空表现出增强的低层反气旋。贝加尔湖周围变暖和东大西洋/俄罗斯西部（EAWR）模式的相变可以削弱上层东亚急流（EAJS），从而为与下层反气旋异常相关的下降提供有利条件。至于第三阶段，异常ST和相关的EASM环流均呈现偶极子模式。

更新日期：2021-04-26

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