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On the (In)Homogeneity of Reanalysis Products

On the (In)Homogeneity of Reanalysis Products The homogeneity of the ECMWF 40-yr Re-Analysis (ERA-40) is assessed. This is done by comparing ERA-40 data with results from the NCEP–NCAR reanalysis and also by investigating a known relationship between a modeled (latent heat flux) and an external (SST) quantity. The direct comparison between the two reanalyses reveals a lot of inhomogeneities. They occur mainly in the Southern Hemisphere and before 1980. While observational density was sufficient to effectively constrain the models in the Northern Hemisphere, it was not in the Southern Hemisphere. From the investigation of the relationship between latent heat flux and SST it is found that, because of an increasing amount of data, the reanalysis results become more reliable toward the end of the reanalysis period (approximately after 1980). When using the reanalysis data to investigate climate change issues care has to be taken not to confuse the inhomogeneities with real changes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Climate American Meteorological Society

On the (In)Homogeneity of Reanalysis Products

Journal of Climate , Volume 17 (19) – Sep 25, 2003

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Publisher
American Meteorological Society
Copyright
Copyright © 2003 American Meteorological Society
ISSN
1520-0442
DOI
10.1175/1520-0442(2004)017<3866:OTIORP>2.0.CO;2
Publisher site
See Article on Publisher Site

Abstract

The homogeneity of the ECMWF 40-yr Re-Analysis (ERA-40) is assessed. This is done by comparing ERA-40 data with results from the NCEP–NCAR reanalysis and also by investigating a known relationship between a modeled (latent heat flux) and an external (SST) quantity. The direct comparison between the two reanalyses reveals a lot of inhomogeneities. They occur mainly in the Southern Hemisphere and before 1980. While observational density was sufficient to effectively constrain the models in the Northern Hemisphere, it was not in the Southern Hemisphere. From the investigation of the relationship between latent heat flux and SST it is found that, because of an increasing amount of data, the reanalysis results become more reliable toward the end of the reanalysis period (approximately after 1980). When using the reanalysis data to investigate climate change issues care has to be taken not to confuse the inhomogeneities with real changes.

Journal

Journal of ClimateAmerican Meteorological Society

Published: Sep 25, 2003

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