Role of equatorial central Pacific sea surface temperature in modulating rainfall over north India during Indian summer monsoon,International Journal of Climatology

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Role of equatorial central Pacific sea surface temperature in modulating rainfall over north India during Indian summer monsoon
International Journal of Climatology ( IF 3.5 ) Pub Date : 2021-04-30 , DOI: 10.1002/joc.7165
Monalisa Sahoo _{1,

2} , Ramesh Kumar Yadav ₁

Affiliation

The summer monsoon season contributes about 80% of annual rainfall in the highly populated region of north India. The teleconnections moderating the variation of summer monsoon rainfall in this region are not satisfactorily understood. A pathway of the equatorial central Pacific sea surface temperature (PSST) influences the north India summer rainfall is revealed from the high-resolution, more reliable, and state-of-the-art 41-year (1979–2019) observational data analysis and numerical experiment. The rise in PSST intensifies convection over the equatorial central Pacific with compensatory subsidence over the western equatorial Pacific. Consequently, a much broader and intense anomalous convergence is developed at the upper-troposphere, which subsequently intensifies the Asian subtropical westerly jet-stream. The Asian jet intensification strengthens the tropospheric wind shear at north India, as the low-level monsoonal winds are easterlies over there. The strong wind shear restricts the convective activities in north India. These results are also confirmed using the CFSv2 model sensitivity experiment and a case study of the year 2010.

中文翻译：

赤道中太平洋海面温度在印度夏季风期间调节印度北部降雨的作用

在印度北部人口稠密的地区，夏季季风季节贡献了大约 80% 的年降雨量。对调节该地区夏季季风降雨变化的遥相关性的理解并不令人满意。通过高分辨率、更可靠和最先进的 41 年（1979-2019）观测数据分析揭示了赤道中太平洋海面温度 (PSST) 影响印度北部夏季降雨的路径。数值实验。PSST 的上升加剧了赤道中太平洋上空的对流，而赤道西太平洋发生了补偿性下沉。因此，在对流层上层形成了更广泛和强烈的异常辐合，随后加强了亚洲副热带西风急流。亚洲急流增强加强了印度北部的对流层风切变，因为那里的低层季风是东风。强风切变限制了印度北部的对流活动。使用 CFSv2 模型敏感性实验和 2010 年的案例研究也证实了这些结果。

更新日期：2021-04-30

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