Water cycle: Lena

My work on land surface processes and land-atmosphere-ocean interactions has so far focused on the question of how the hydrologic cycle is changing in a changing climate. I utilize measurements of those components of the hydrologic system that I believe are reliable (runoff, snow depth, surface air temperature, ground-based cloud and radiation observations). For Siberia, I have analyzed more than 60 years of these observations for trends and co-variation that indicate physical processes and interactions. In the satellite era, I examine the potential role of decreasing sea ice coverage as a moisture source in the Arctic and Sub-arctic. To look at changes in processes which are difficult to measure, I have run several conceptual experiments with the NSIPP catchment-based land surface model. My first paper on this topic has been presented at several conferences during 2006 and will be submitted shortly.