Coupling of the Common Land Model to the NCAR Community Climate Model

Xubin Zeng, Muhammad Shajkh, Yongjiu Dai, Robert E. Dickinson, Ranga Myneni

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Abstract

The Common Land Model (CLM), which results from a 3-yr joint effort among seven land modeling groups, has been coupled with the National Center for Atmospheric Research (NCAR) Community Climate Model (CCM3). Two 15-yr simulations of CCM3 coupled with CLM and the NCAR Land Surface Model (LSM), respectively, are used to document the relative impact of CLM versus LSM on land surface climate. It is found that CLM significantly reduces the summer cold bias of surface air temperature in LSM, which is associated with higher sensible heat fluxes and lower latent heat fluxes in CLM, and the winter warm bias over seasonally snow-covered regions, especially in Eurasia. CLM also significantly improves the simulation of the annual cycle of runoff in LSM. In addition, CLM simulates the snow mass better than LSM during the snow accumulation stage. These improvements are primarily caused by the improved parameterizations in runoff, snow, and other processes (e.g., turbulence) in CLM. The new land boundary data (e.g., leaf-area index, fractional vegetation cover, albedo) also contribute to the improvement in surface air temperature simulation over some regions. Overall, CLM has little impact on precipitation and surface net radiative fluxes.

Original languageEnglish (US)
Pages (from-to)1832-1854
Number of pages23
JournalJournal of Climate
Volume15
Issue number14
Publication statusPublished - Jul 15 2002

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ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Zeng, X., Shajkh, M., Dai, Y., Dickinson, R. E., & Myneni, R. (2002). Coupling of the Common Land Model to the NCAR Community Climate Model. Journal of Climate, 15(14), 1832-1854.