Central Asia is facing an unprecedented juxtaposition of regional climate- and water-related issues, emphasised by a changing climate. We investigate the potential impact of long-term climate change on the availability of water resources in the Amu Darya River, one of the two major rivers that feed the Aral Sea, and its effect on irrigation in the region. Using a water balance accounting model developed for the Amu Darya basin, we find that projected increases in summer temperatures of up to 5 °C by 2070–2099 under a high-emission scenario, combined with likely shifts in the seasonality of precipitation, would lead to an increase in crop water consumptive demand of between 10.6 and 16 % (or between 3.7 and 5.5 km³ y⁻¹) relative to 1961–1990. By the end of the century, 34 to 49 % of the basin’s existing 3.4 million ha of irrigated land would go unirrigated in a 1:20 year drought. Runoff is also expected to decline by between 10 and 20 % on current levels, however contributions to river flows from unsustainable glacial retreat and snow-melt are likely to remain small. While the uncertainty surrounding the precipitation projections is high, the effect of increased temperatures on irrigation practices in the basin is more robust in the long-term.

Item Type:	Refereed Article
Keywords:	Amu Darya, Central Asia, climate change, water resources, irrigation
Research Division:	Earth Sciences
Research Group:	Physical Geography and Environmental Geoscience
Research Field:	Surface Processes
Objective Division:	Environment
Objective Group:	Climate and Climate Change
Objective Field:	Global Effects of Climate Change and Variability (excl. Australia, New Zealand, Antarctica and the South Pacific) (excl. Social Impacts)
UTAS Author:	White, CJ (Dr Chris White)
ID Code:	97380
Year Published:	2014
Web of Science® Times Cited:	10
Deposited By:	Engineering
Deposited On:	2014-12-15
Last Modified:	2017-10-30
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