A southeastward view across the Kara Sea and arctic Russia reveals dark brown water flowing from the estuaries of the Yenisei and Ob rivers. The colored dissolved organic material (CDOM) that darkens such waters may be increasing in concentration as the climate warms. The effects of CDOM upon such things as Arctic Ocean temperature and primary production are active topics of research.
The above Aqua MODIS data were collected on June 29, 2012. Click on the image for a larger view or get the full-resolution version (9.8 megabytes)