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  Impact of irrigation on South Asian summer monsoons

Saeed, F., Hagemann, S., & Jacob, D. (2009). Impact of irrigation on South Asian summer monsoons. Geophysical Research Letters, 36: L20711. doi:10.1029/2009GL040625.

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Saeed, F.1, 2, Author              
Hagemann, S.1, 2, Author              
Jacob, D.3, Author              
Affiliations:
1The Land in the Earth System, MPI for Meteorology, Max Planck Society, ou_913551              
2Terrestrial Hydrology, The Land in the Earth System, MPI for Meteorology, Max Planck Society, ou_913560              
3The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913550              

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 Abstract: The Indian subcontinent is one of the most intensely irrigated regions of the world and state of the art climate models do not account for the representation of irrigation. Sensitivity studies with the regional climate model REMO show distinct feedbacks between the simulation of the monsoon circulation with and without irrigation processes. We find that the temperature and mean sea level pressure, where the standard REMO version without irrigation shows a significant bias over the areas of Indus basin, is highly sensitive to the water used for irrigation. In our sensitivity test we find that removal of this bias has causedness differential heating between land and sea masses. This in turns reduces the westerlies entering into land from Arabian Sea, hence creating conditions favorable for currents from Bay of Bengal to intrude deep into western India and Pakistan that have been unrealistically suppressed before. We conclude that the representation of irrigated water is unavoidable for realistic simulation of south Asian summer monsoon and its response under global warming.

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Language(s): eng - English
 Dates: 2009-10
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: eDoc: 437277
DOI: 10.1029/2009GL040625
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Title: Geophysical Research Letters
  Alternative Title : Geophys. Res. Letts.
Source Genre: Journal
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Pages: - Volume / Issue: 36 Sequence Number: L20711 Start / End Page: - Identifier: -