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

Vasubandhu Misra, Paul A. Dirmeyer, Benjamin Kirtman

Research output: Contribution to journalArticle

7 Citations (Scopus)

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)
JournalJournal of Geophysical Research C: Oceans
Volume107
Issue number20
DOIs
StatePublished - 2002
Externally publishedYes

Fingerprint

regional climate
climate
land surface
comparative study
biosphere
Central America
river basins
highlands
Catchments
surface temperature
South America
Caribbean Sea
river basin
Rivers
Atlantic Ocean
Pacific Ocean
ocean
vegetation
plateaus
soils

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

  • Oceanography
  • Astronomy and Astrophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geophysics
  • Geochemistry and Petrology

Cite this

A comparative study of two land surface schemes in regional climate integrations over South America. / Misra, Vasubandhu; Dirmeyer, Paul A.; Kirtman, Benjamin.

In: Journal of Geophysical Research C: Oceans, Vol. 107, No. 20, 2002.

Research output: Contribution to journalArticle

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