Impact of different initial soil moisture fields on Eta model weather forecasts for South America

L. Gustavo Goncalves de Goncalves, W. James Shuttleworth, Sin Chan Chou, Yongkang Xue, Paul R. Houser, David L. Toll, José Marengo, Mathew Rodell

Research output: Contribution to journalArticle

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Abstract

Two 7-day weather simulations were made for South America in July 2003 and January 2004 (in the Southern Hemisphere summer and winter) to investigate the impacts of using different soil moisture initialization fields in the Eta model coupled to the Simplified Simple Biosphere (SSiB) land surface model. The alternative initial soil moisture fields were (1) the soil moisture climatology used operationally by the Centro de Previsão do Tempo e Estudos Climáticos in Brazil and (2) the soil moisture fields generated by a South American Land Data Assimilation System (SALDAS) based on SSiB. When the SALDAS soil moisture fields were used, there was an increase in the model performance relative to climatology in the equitable threat score calculated with respect to observed surface precipitation fields and a decrease (up to 53%) in the root-mean-square error relative to the NCEP analysis of the modeled geopotential height at 500 hPa and mean sea level pressure. However, there was small change in the model skill in positioning the primary South American weather systems because of a change in the upper troposphere circulation caused by SALDAS initialization, most noticeably in the South Atlantic Convergence Zone.

Original languageEnglish (US)
Article numberD17102
JournalJournal of Geophysical Research: Space Physics
Volume111
Issue number17
DOIs
StatePublished - Sep 16 2006

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soil moisture
Soil moisture
weather
forecasting
assimilation
data assimilation
Climatology
biosphere
climatology
geopotential height
Troposphere
root-mean-square errors
Sea level
Southern Hemisphere
sea level pressure
Brazil
geopotential
troposphere
sea level
Mean square error

ASJC Scopus subject areas

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

Cite this

Impact of different initial soil moisture fields on Eta model weather forecasts for South America. / de Goncalves, L. Gustavo Goncalves; Shuttleworth, W. James; Chou, Sin Chan; Xue, Yongkang; Houser, Paul R.; Toll, David L.; Marengo, José; Rodell, Mathew.

In: Journal of Geophysical Research: Space Physics, Vol. 111, No. 17, D17102, 16.09.2006.

Research output: Contribution to journalArticle

de Goncalves, L. Gustavo Goncalves ; Shuttleworth, W. James ; Chou, Sin Chan ; Xue, Yongkang ; Houser, Paul R. ; Toll, David L. ; Marengo, José ; Rodell, Mathew. / Impact of different initial soil moisture fields on Eta model weather forecasts for South America. In: Journal of Geophysical Research: Space Physics. 2006 ; Vol. 111, No. 17.
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