Summer 2014 marked another milestone for the Aral Sea, the once-extensive lake in Central Asia that has been shrinking markedly since the 1960s. For the first time in modern history, the eastern basin of the South Aral Sea has completely dried.
Philip Micklin, a geographer emeritus from Western Michigan University and an Aral Sea expert. He said:
This is the first time the eastern basin has completely dried in modern times. And it is likely the first time it has completely dried in 600 years, since Medieval desiccation associated with diversion of Amu Darya to the Caspian Sea.
A massive irrigation project has devastated the Aral Sea over the past 50 years. In the 1950s and 1960s, the government of the former Soviet Union diverted the Amu Darya and the Syr Darya – the region’s two major rivers – to irrigate farmland. The diversion began the lake’s gradual retreat. By the year 2000, the lake had already separated into the North (Small) Aral Sea in Kazakhstan and the South (Large) Aral Sea in Uzbekistan. The South Aral had further split into western and eastern lobes.
The eastern lobe of the South Aral nearly dried in 2009 and then saw a huge rebound in 2010. Water levels continued to fluctuate annually in alternately dry and wet years.
According to Micklin, the desiccation in 2014 occurred because there has been less rain and snow in the watershed that starts in the distant Pamir Mountains; this has greatly reduced water flow on the Amu Darya. In addition, huge amounts of river water continue to be withdrawn for irrigation. The Kok-Aral Dam across the Berg Strait – a channel that connects the northern Aral Sea with the southern part – played some role, but has not been a major factor this year, he said. Micklin said:
This part of the Aral Sea is showing major year-to-year variations that are dependent on flow of Amu Darya. I would expect this pattern to continue for some time.
Eleanor Imster has helped write and edit EarthSky since 1995. She was an integral part of the award-winning EarthSky radio series almost since it began until it ended in 2013. Today, as Lead Editor at EarthSky.org, she helps present the science and nature stories and photos you enjoy. She also serves as one of the voices of EarthSky on social media platforms including Facebook, Twitter and G+. She and her husband live in Tennessee and have two grown sons.