Comparison of local precipitation-SST relationship between the observation and a reanalysis dataset

Details Comparison of local precipitation-SST relationship between the observation and a reanalysis dataset Comparison of local precipitation-SST relationship between the observation and a reanalysis dataset

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3112206a&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 12, CiteID L12206

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6

Meteorology And Atmospheric Dynamics: Climatology (1620), Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation, Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions (0312, 4504), Meteorology And Atmospheric Dynamics: Precipitation (1854), Meteorology And Atmospheric Dynamics: Tropical Meteorology

Scientific paper

We defined a grid-scale time-phase relationship between precipitation (PR) and underlying sea surface temperature (SST) as the local PR-SST relationship, and compared the spatial distribution of the relationship in the observation with that in a reanalysis dataset. An analysis using observed pentad mean data shows precipitation lagging SST for two pentads over large areas of tropical oceans. A reanalysis dataset, on the other hand, has a shorter time-phase difference between precipitation and SST than that in the observation and does not match the spatial distribution of the observed local PR-SST relationship over the tropical Indian Ocean and the tropical western Pacific. A reanalysis dataset may not capture the observed local PR-SST relationship in terms of either time-phase difference or spatial distribution because a numerical model in a data assimilation system uses SST as a lower boundary condition as well as the inhomogeneity of observations the system used.

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