Details

Autor(en) / Beteiligte

• Douglas, Ellen M.
• Niyogi, Dev
• Frolking, S.
• Yeluripati, J. B.
• Pielke Sr, Roger A.
• Niyogi, Nivedita
• Vörösmarty, C. J.
• Mohanty, U. C.

Titel

Changes in moisture and energy fluxes due to agricultural land use and irrigation in the Indian Monsoon Belt

Ist Teil von

• Geophysical research letters, 2006-07, Vol.33 (14), p.L14403-n/a

Ort / Verlag

Washington, DC: American Geophysical Union

Erscheinungsjahr

2006

Quelle

Wiley Online Library Journals【Remote access available】

Beschreibungen/Notizen

• We present a conceptual synthesis of the impact that agricultural activity in India can have on land‐atmosphere interactions through irrigation. We illustrate a “bottom up” approach to evaluate the effects of land use change on both physical processes and human vulnerability. We compared vapor fluxes (estimated evaporation and transpiration) from a pre‐agricultural and a contemporary land cover and found that mean annual vapor fluxes have increased by 17% (340 km3) with a 7% increase (117 km3) in the wet season and a 55% increase (223 km3) in the dry season. Two thirds of this increase was attributed to irrigation, with groundwater‐based irrigation contributing 14% and 35% of the vapor fluxes in the wet and dry seasons, respectively. The area averaged change in latent heat flux across India was estimated to be 9 Wm−2. The largest increases occurred where both cropland and irrigated lands were the predominant contemporary land uses.