Final Technical Report - weADAPT

Range of change in annual rainfall in Mekong River basin
Wet year scenario
Zone Climate scenario:
CO 2 = 360 ppm
Climate scenario:
CO 2 = 540 ppm
Climate scenario:
CO 2 = 720 ppm
Unit: Millimeter/100km 2
Thailand 1,384 1,257 1,384
Lao PDR 1,981 2,222 2,549
Vietnam 1,743 1,939 1,983
Table 6: Annual precipitation in Mekong River basin in Lao PDR, Thailand and
Vietnam – Wet year scenario
The condition is different in the driest year of the decade; annual precipitation in
Mekong River delta in Viet Nam will remain unchanged but Thailand will have higher
rainfall by almost 10%. Annual rainfall will remain almost unchanged in Lao PDR under
climate condition at atmospheric CO 2 of 540ppm but will increase by 25% under climate
condition at atmospheric CO 2 of 720ppm.
Zone
Range of change in annual rainfall in Mekong River basin
Climate scenario:
CO 2 = 360 ppm
Dry year scenario
Climate scenario: Climate scenario:
CO 2 = 540 ppm CO 2 = 720 ppm
Unit: Millimeter/100km 2
Thailand 1,069 1,105 1,168
Lao PDR 1,504 1,529 1,888
Vietnam 1,457 1,424 1,434
Table 7: Annual precipitation in Mekong River basin in Lao PDR, Thailand and
Vietnam – Dry year scenario
4.4 Conclusions
The major change in climate pattern in the lower Mekong River basin is mainly
on the precipitation and prolonged summertime. The result from simulation shows that
precipitation will increase throughout the region in the future, especially in Lao PDR.
Climate variability tends to be more extreme as the range of precipitation between dry
Final technical report – AIACC AS07 40