Effects of multilayer snow scheme on the simulation of snow: Offline Noah and coupled with NCEP CFSv2

Autor: Subodh Kumar Saha, K. Sujith, Samir Pokhrel, Hemantkumar S. Chaudhari, Anupam Hazra
Jazyk: angličtina
Rok vydání: 2017
Předmět:
Zdroj: Journal of Advances in Modeling Earth Systems, Vol 9, Iss 1, Pp 271-290 (2017)
Druh dokumentu: article
ISSN: 1942-2466
DOI: 10.1002/2016MS000845
Popis: Abstract The Noah version 2.7.1 is a moderately complex land surface model (LSM), with a single layer snowpack, combined with vegetation and underlying soil layer. Many previous studies have pointed out biases in the simulation of snow, which may hinder the skill of a forecasting system coupled with the Noah. In order to improve the simulation of snow by the Noah, a multilayer snow scheme (up to a maximum of six layers) is introduced. As Noah is the land surface component of the Climate Forecast System version 2 (CFSv2) of the National Centers for Environmental Prediction (NCEP), the modified Noah is also coupled with the CFSv2. The offline LSM shows large improvements in the simulation of snow depth, snow water equivalent (SWE), and snow cover area during snow season (October to June). CFSv2 with the modified Noah reveals a dramatic improvements in the simulation of snow depth and 2 m air temperature and moderate improvements in SWE. As suggested in the previous diagnostic and sensitivity study, improvements in the simulation of snow by CFSv2 have lead to the reduction in dry bias over the Indian subcontinent (by a maximum of 2 mm d−1). The multilayer snow scheme shows promising results in the simulation of snow as well as Indian summer monsoon rainfall and hence this development may be the part of the future version of the CFS.
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