Evaluation of the Global Land Data Assimilation System (GLDAS) air temperature data products

Journal of Hydrometeorology
By: , and 

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Abstract

There is a high demand for agrohydrologic models to use gridded near-surface air temperature data as the model input for estimating regional and global water budgets and cycles. The Global Land Data Assimilation System (GLDAS) developed by combining simulation models with observations provides a long-term gridded meteorological dataset at the global scale. However, the GLDAS air temperature products have not been comprehensively evaluated, although the accuracy of the products was assessed in limited areas. In this study, the daily 0.25° resolution GLDAS air temperature data are compared with two reference datasets: 1) 1-km-resolution gridded Daymet data (2002 and 2010) for the conterminous United States and 2) global meteorological observations (2000–11) archived from the Global Historical Climatology Network (GHCN). The comparison of the GLDAS datasets with the GHCN datasets, including 13 511 weather stations, indicates a fairly high accuracy of the GLDAS data for daily temperature. The quality of the GLDAS air temperature data, however, is not always consistent in different regions of the world; for example, some areas in Africa and South America show relatively low accuracy. Spatial and temporal analyses reveal a high agreement between GLDAS and Daymet daily air temperature datasets, although spatial details in high mountainous areas are not sufficiently estimated by the GLDAS data. The evaluation of the GLDAS data demonstrates that the air temperature estimates are generally accurate, but caution should be taken when the data are used in mountainous areas or places with sparse weather stations.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Evaluation of the Global Land Data Assimilation System (GLDAS) air temperature data products
Series title Journal of Hydrometeorology
DOI 10.1175/JHM-D-14-0230.1
Volume 16
Year Published 2015
Language English
Publisher American Meteorological Society
Contributing office(s) Earth Resources Observation and Science (EROS) Center
Description 18 p.
First page 2463
Last page 2480