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Climate Variability & Change

Objective: Our primary objective is to evaluate the potential and ability of GLDAS (Global Land Data Assimilation System) land surface state simulation results, and to assess the impacts of (1) satellite rainfall algorithms, (2) GLDAS model structure, and (3) Rainfall's space-time resolutions, as a function of storm meteorology and watershed characteristics. Approach: First, we plan to use the land surface states simulated with a physically-based, distributed hydrologic model driven by ground-based and rain gauge rainfall as 'reference fields' to evaluate the ability of GLDAS to simulate land surface state variables when using different satellite rainfall forcing. Second, we plan to utilize the recently released high-resolution satellite rainfall products; namely, PERSIANN, CMORPH, NRLgeo, TRMM's 3B42RT and TRMM's 3B42v6 in order to more fully measure the reliability of all these products in GLDAS simulations. Third, we plan to conduct this study in different data-rich regions, characterized by different climate and watershed characteristics, to understand the effects of different climates and watershed characteristics. Fourth, we plan to partition the total error in GLDAS simulations into its components: GLDAS model error, and satellite rainfall input error. Fifth, we also plan to evaluate the impacts of satellite rainfall resolution (in both space and time) on GLDAS simulations of land surface state variables. Significance to NASA: NASA's key science questions: 'How is the global Earth system changing?', 'What are the primary causes of change in the Earth system?', and 'How does the Earth system respond to natural and human-induced changes?' are currently unattainable due to lack of information on uncertainty of global land surface state variable simulations. Quantifying this uncertainty will give quantitative confidence to those answers. The proposed research also supports NASA's Strategic Objective of 'studying the Earth from space' by helping to understand and promote the use of NASA's space-based advances.

Project PI: Mekonnen Gebremichael/University of Connecticut

School of Engineering 261 Glenbrook Rd., Unit 2237 University of Connecticut Storrs, CT 06269-2237

Email: bitew@engr.uconn.edu

http://www.engr.uconn.edu/mekonnennasa.php

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Started: Aug 09, 2010

Last Activity: Dec 09, 2010

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