Zhichao Yang , Chujie Gao , Gen Li , Yang Li , Bei Xu , Dezhi Zhang , Zhi Yuan , Xuanke Wang
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引用次数: 0
摘要
海洋大陆(MC)的夏季降水与当地居民的生活息息相关,相应的强对流活动对亚洲区域气候的远程变化也至关重要。利用 1958 年至 2020 年的观测和再分析数据,我们发现不同衰减速率的厄尔尼诺现象会导致海洋大陆地区夏季降水异常的不同。在快速衰减(FD)的厄尔尼诺夏季,管委会地区降水过剩,而在缓慢衰减(SD)的厄尔尼诺夏季,管委会降水减少。在夏季衰减期,赤道中东太平洋暖海面温度异常迅速转为冷海面温度异常,而受印度洋-西太平洋电容效应影响,管委会地区的暖海面温度异常持续存在。这种局地暖的 SST 异常导致异常上升和过量降水,进一步刺激低层偏东风向 MC 以东移动,增加了水汽输送。在 SD 厄尔尼诺现象中,中东太平洋暖海温异常持续到夏季衰减,不断调整沃克环流。与减弱的沃克环流区域相关的异常局地下降运动阻碍了夏季 MC 降水。我们的研究结果有利于对地中海夏季气候变迁的局地研究,并可能有利于区域气候预测。
Opposite summer precipitation anomalies over the Maritime Continent in fast and slow decaying El Niño cases
Summer precipitation over the Maritime Continent (MC) is tightly connected to livelihoods of the locals, and the corresponding strong convective activities are also crucial to Asian regional climate variations remotely. Using observational and reanalysis data from 1958 to 2020, we found that El Niño with different decay rates can cause different summer precipitation anomalies in the MC area. In the fast decaying (FD) El Niño summer, the MC area shows a precipitation surplus, while the MC precipitation decreases during the slow decaying (SD) El Niño summer. For the FD El Niño, the equatorial central-eastern Pacific warm sea surface temperature (SST) anomaly quickly turns into cold in the decaying summer, while the SST over MC region sustains a warm anomaly owing to the Indo-western Pacific Ocean capacitor effect. This local warm SST anomaly leads to anomalous ascent and then excessive precipitation, further stimulating low-level easterly wind to east of the MC with increased water vapor transport. For the SD El Niño, the central-eastern Pacific warm SST anomaly sustains till the decaying summer, continuously adjusting the Walker circulation. An anomalous local descent motion associated with the weakened Walker circulation region hampers the MC precipitation in summer. Our findings benefit the local researches of the MC summer climate variations, and potentially favor the regional climate predictions.
期刊介绍:
The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.