Role of Oceanic and Terrestrial Atmospheric Moisture Sources in Intraseasonal Variability of Indian Summer Monsoon Rainfall.
Role of Oceanic and Terrestrial Atmospheric Moisture Sources in Intraseasonal Variability of Indian Summer Monsoon Rainfall.
复制标题
DOI：
10.1038/s41598-017-13115-7
复制
发表时间：
2017-10-06
影响因子：
4.6
通讯作者：
Murtugudde R
中科院分区：
文献类型：
--
作者：
Pathak A;Ghosh S;Kumar P;Murtugudde R
印度次大陆的夏季季风降雨在季节内时间尺度上表现出显著的变化，分别为10-60天的高降水和低降水周期，称为活跃期和间歇期。本文基于拉格朗日轨迹方法，基于ecmwf - era -中期再分析数据，利用一个动态循环模型，研究了从海洋和陆地到印度大陆的水分在季节内时间尺度上的输送。季风降水的季节内变化与从印度大陆到印度洋的南北模式和从核心季风区到印度东部的东西模式有关。研究发现，西部和中部印度洋（WIO和CIO）的海洋水汽源对前者有贡献，而主要的陆地水汽源恒河盆地（GB）则对后者有贡献。活跃期印度-恒河平原上季风槽的形成，使得除了来自WIO和CIO的西南急流外，还有来自孟加拉湾和GB的高水汽输送到CMZ。我们的结果表明，在模拟季风季节内变化的模式中，需要正确地表示海洋和陆地的水分来源。
Summer Monsoon Rainfall over the Indian subcontinent displays a prominent variability at intraseasonal timescales with 10–60 day periods of high and low rainfall, known as active and break periods, respectively. Here, we study moisture transport from the oceanic and terrestrial sources to the Indian landmass at intraseasonal timescales using a dynamic recycling model, based on a Lagrangian trajectory approach applied to the ECMWF–ERA–interim reanalysis data. Intraseasonal variation of monsoon rainfall is associated with both a north-south pattern from the Indian landmass to the Indian Ocean and an east-west pattern from the Core Monsoon Zone (CMZ) to eastern India. We find that the oceanic sources of moisture, namely western and central Indian Oceans (WIO and CIO) contribute to the former, while the major terrestrial source, Ganga basin (GB) contributes to the latter. The formation of the monsoon trough over Indo-Gangetic plain during the active periods results in a high moisture transport from the Bay of Bengal and GB into the CMZ in addition to the existing southwesterly jet from WIO and CIO. Our results indicate the need for the correct representation of both oceanic and terrestrial sources of moisture in models for simulating the intraseasonal variability of the monsoon.
登录
查看更多内容
影响因子：
4.9
作者：
Krishnamurthy, V.;Shukla, J.
通讯作者：
Shukla, J.
影响因子：
4.6
作者：
Annamalai, H;Slingo, JM
通讯作者：
Slingo, JM
影响因子：
4.9
作者：
Dominguez, F;Kumar, P;Ting, MF
通讯作者：
Ting, MF
影响因子：
5.2
作者：
Goswami, BN;Xavier, PK
通讯作者：
Xavier, PK
DOI：
10.1126/science.1215904
发表时间：
2012-02-17
期刊：
Science (New York, N.Y.)
影响因子：
--
作者：
Hanson MA;Roth CB;Jo E;Griffith MT;Scott FL;Reinhart G;Desale H;Clemons B;Cahalan SM;Schuerer SC;Sanna MG;Han GW;Kuhn P;Rosen H;Stevens RC
通讯作者：
Stevens RC