Premium
Asian irrigation, African rain: Remote impacts of irrigation
Author(s) -
Vrese Philipp,
Hagemann Stefan,
Claussen Martin
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl068146
Subject(s) - irrigation , environmental science , precipitation , monsoon , arid , climate change , agriculture , food security , water resources , irrigation statistics , water resource management , climatology , geography , farm water , water conservation , meteorology , geology , oceanography , ecology , biology , paleontology , archaeology
Irrigation is not only vital for global food security but also constitutes an anthropogenic land use change, known to have strong effects on local hydrological and energy cycles. Using the Max Planck Institute for Meteorology's Earth System Model, we show that related impacts are not confined regionally but that possibly as much as 40% of the present‐day precipitation in some of the arid regions in Eastern Africa are related to irrigation‐based agriculture in Asia. Irrigation in South Asia also substantially influences the climate throughout Southeast Asia and China via the advection of water vapor and by altering the Asian monsoon. The simulated impact of irrigation on remote regions is sensitive to the magnitude of the irrigation‐induced moisture flux. Therefore, it is likely that a future extension or decline of irrigated areas due to increasing food demand or declining fresh water resources will also affect precipitation and temperatures in remote regions.