Land Surface Climate in the Regional Arctic System Model
Lettenmaier, Dennis P.
MetadataShow full item record
The Regional Arctic System Model (RASM) is a fully coupled, regional Earth system model applied over the pan-Arctic domain. This paper discusses the implementation of the Variable Infiltration Capacity land surface model (VIC) in RASM and evaluates the ability of RASM, version 1.0, to capture key features of the land surface climate and hydrologic cycle for the period 1979-2014 in comparison with uncoupled VIC simulations, reanalysis datasets, satellite measurements, and in situ observations. RASM reproduces the dominant features of the land surface climatology in the Arctic, such as the amount and regional distribution of precipitation, the partitioning of precipitation between runoff and evapotranspiration, the effects of snow on the water and energy balance, and the differences in turbulent fluxes between the tundra and taiga biomes. Surface air temperature biases in RASM, compared to reanalysis datasets ERA-Interim and MERRA, are generally less than 2 degrees C; however, in the cold seasons there are local biases that exceed 6 degrees C. Compared to satellite observations, RASM captures the annual cycle of snow-covered area well, although melt progresses about two weeks faster than observations in the late spring at high latitudes. With respect to derived fluxes, such as latent heat or runoff, RASM is shown to have similar performance statistics as ERA-Interim while differing substantially from MERRA, which consistently overestimates the evaporative flux across the Arctic region.
The article of record as published may be found at http://dx.doi.org/10.1175/JCLI-D-15-0415.1
Showing items related by title, author, creator and subject.
Hamman, Joseph; Nijssen, Bart; Roberts, Andrew; Craig, Anthony; Maslowski, Wieslaw; Osinski, Robert (American Geophysical Union, 2017-01);The coastal streamflow flux from the Arctic drainage basin is an important driver of dynamics in the coupled ice-ocean system. Comprising more than one-third of the total freshwater flux into the Arctic Ocean, streamflow ...
Hamman, Joseph; Nijssen, Bart; Roberts, Andrew; Craig, Anthony; Maslowski, Wieslaw; Osinski, Robert (AGU Publications, 2017-03);The coastal streamflow flux from the Arctic drainage basin is an important driver of dynamics in the coupled ice-ocean system. Comprising more than one third of the total freshwater flux into the Arctic Ocean, streamflow ...
Bradley, Douglas A. (Naval Postgraduate School (U.S.)Program for Culture and Conflict Studies, 2011-04-22);"In 1867, Secretary of State William Seward purchased Alaska securing America's place with Russia, Norway, Denmark, and neighboring Canada as an Arctic nation. Though criticized as 'Seward's Ice Box,' in short time, Alaska ...