Meteorology and Atmospheric Physics

, Volume 130, Issue 2, pp 175–190 | Cite as

Atmospheric water budget over the South Asian summer monsoon region

Original Paper
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Abstract

High resolution hybrid atmospheric water budget over the South Asian monsoon region is examined. The regional characteristics, variability, regional controlling factors and the interrelations of the atmospheric water budget components are investigated. The surface evapotranspiration was created using the High Resolution Land Data Assimilation System (HRLDAS) with the satellite-observed rainfall and vegetation fraction. HRLDAS evapotranspiration shows significant similarity with in situ observations and MODIS satellite-observed evapotranspiration. Result highlights the fundamental importance of evapotranspiration over northwest and southeast India on atmospheric water balance. The investigation shows that the surface net radiation controls the annual evapotranspiration over those regions, where the surface evapotranspiration is lower than 550 mm. The rainfall and evapotranspiration show a linear relation over the low-rainfall regions (<500 mm/year). Similar result is observed in in NASA GLDAS data (1980–2014). The atmospheric water budget shows annual, seasonal, and intra-seasonal variations. Evapotranspiration does not show a high intra-seasonal variability as compared to other water budget components. The coupling among the water budget anomalies is investigated. The results show that regional inter-annual evapotranspiration anomalies are not exactly in phase with rainfall anomalies; it is strongly influenced by the surface conditions and other atmospheric forcing (like surface net radiation). The lead and lag correlation of water budget components show that the water budget anomalies are interrelated in the monsoon season even up to 4 months lead. These results show the important regional interrelation of water budget anomalies on south Asian monsoon.

Notes

Acknowledgements

The TRMM data used in study is obtained from National Aeronautics and Space Administration (USA) Giovanni website. In situ observations from IMD and MODIS evapotranspiration data are obtained from University of Montana, USA. ERA Interim data are downloaded from ECMWF website. GLDAS data are available at NASA LDAS (GES DISC) server. Authors thank two anonymous reviewers for their constructive comments, which helped to improve this manuscript.

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Copyright information

© Springer-Verlag Wien 2017

Authors and Affiliations

  1. 1.National Centre for Earth Science StudiesESSO-MoES, Government of IndiaThiruvananthapuramIndia
  2. 2.Ministry of Earth SciencesNew DelhiIndia

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