A comparative study of two land surface schemes in regional climate integrations over South America

Vasubandhu Misra, Paul A. Dirmeyer, Ben P. Kirtman

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

A case study comparison using two different land surface models in the Regional Spectral Model (RSM) is presented here. This comparison is motivated from recent studies that show a significant impact of land surface processes on the predictability of precipitation at seasonal to interannual scales. We find in this comparative study that coupled land-atmosphere interactions using the simplified simple biosphere (SSiB) scheme and a two-layer soil (control) model with uniform vegetation fraction yield mixed results. It does not clearly indicate the superiority of one scheme over, the other for this particular case. The warmer mean surface temperatures simulated by RSM-SSiB improve the seasonal (January-February-March [JFM]) simulation over Amazon River Basin, along Brazilian Highlands, over Bolivian Plateau, and over central America relative to the control model. However, the RSM-SSiB runs exhibit a strong warm bias-in the surface temperature over the subtropics of South America. The mean JFM onshore easterly flow from the tropical Atlantic Ocean and the low-level jet are relatively stronger in the SSiB model. The mean JFM precipitation from the RSM-SSiB model shows an improvement over Guianan Highlands, Venezeulan Llanos, and Amazon River Basin. However, the mean JFM precipitation of the control model over the Caribbean Sea, Central America, and equatorial eastern Pacific Ocean is better than the SSiB model.

Original languageEnglish (US)
Pages (from-to)LBA 48-1-LBA 48-9
JournalJournal of Geophysical Research: Atmospheres
Volume107
Issue number20
DOIs
StatePublished - Jan 1 2002

    Fingerprint

Keywords

  • 1836 Hydrology: Hydrologie budget (1655)
  • 3309 Meteorology and Atmospheric Dynamics: Climatology (1620)
  • 3374 Meteorology and Atmospheric Dynamics: Tropical meteorology
  • 9360 Information Related to Geographic Region: South America

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this