The Oceanic Barrier Layer in the Eastern Indian Ocean as a Predictor for Rainfall Over Indonesia and Australia
The Oceanic Barrier Layer in the Eastern Indian Ocean as a Predictor for Rainfall Over Indonesia and Australia
复制标题
DOI：
10.1029/2021gl094519
复制
发表时间：
2021-11
影响因子：
5.2
通讯作者：
D. Ivanova;J. McClean;J. Sprintall;Ruei-Gu Chen
中科院分区：
文献类型：
--
作者：
D. Ivanova;J. McClean;J. Sprintall;Ruei-Gu Chen
热带地区的障碍层将热量困在一个较浅且稳定的近地表，并限制较冷的水从下面卷进。这两个过程都提高了海洋表面温度，增强了大气对流。利用高分辨率全耦合前能量尺度地球系统模式0版(E3SMv0)研究了东印度洋雨季障碍层与局地大气对流和远距离降水的关系。偏最小二乘回归表明，澳大利亚的降雨量与苏门答腊岛以西的障碍层厚度(BLT)之间存在显著的关系，这一关系发生在一个月前。最大的正回归系数在澳大利亚北部。苏门答腊岛以西的地区是东亚季风湿气流向澳大利亚北部的战略位置。苏门答腊岛西部BLT的增厚加剧了蒸发和局部对流，并放大了输送到澳大利亚的水汽，从而增加了陆地降雨量。
Barrier layers in the tropics trap heat in a shallow and stable near‐surface layer and limit entrainment of cooler water from below. Both processes act to increase sea surface temperature and enhance atmospheric convection. The high resolution fully coupled pre‐industrial Energy Exascale Earth System Model version 0 (E3SMv0) is used to investigate the relationship between barrier layers in the eastern Indian Ocean during the wet season with local atmospheric convection and remote rainfall. A partial least squares regression reveals a significant relationship between Australasian rainfall and the barrier layer thickness (BLT) west of Sumatra, occurring one month earlier. The largest positive regression coefficients are over northern Australia. The region west of Sumatra is strategically located where the East‐Asian monsoon moisture flows toward northern Australia. Thickening of the west Sumatra BLT intensifies evaporation and local convection and amplifies the moisture transported to Australia acting to increase the terrestrial rainfall.