HR: 09:15h
AN: GC21B-05    [Abstracts]
TI: Investigating Linkages Between the Dynamics of Dust Events and Synoptic and Land Surface Conditions With a Regional Dust Modeling System WRF-DuMo in Central and East Asia Under the NEESPI Initiative
AU: * Darmenova, K
EM: kdarmenova@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0340,
AU: Sokolik, I N
EM: isokolik@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0340,
AB: Growing evidence suggests that land-use/land cover changes and increasing amounts of anthropogenic aerosols might be among the key drivers of observed climate change. Under the Northern Eurasian Earth Science Partnership Initiative (NEESPI) we have been developing a regional dust modeling system by incorporating the dust module DuMo into the NCAR Weather Research and Forecasting (WRF) model. A new terrestrial preprocessor that ingests external aeolian datasets has been developed to support physically-based dust emission schemes implemented in WRF-DuMo. This presentation will focus on the interannual variability of dust events in Central and East Asia in terms of their intensity and duration, addressing the relative importance of prevailing synoptic conditions and regional land surface properties in modulating dust outbreaks. Several studies suggested that during the last two decades dust storm frequency has decreased in both Central and East Asia. The changes in large-scale circulation pattern were suggested to be a main factor. We perform simulations of dust storm events, which occurred under different synoptic conditions for selected spring months over past 50 years, to examine whether the regional modeling system WRF-DuMo is capable of reproducing the observed decreasing trend. In addition, we examine the sensitivity of modeled dust fluxes to meteorological and land surface input parameters for dust events of differing intensity. The results will be presented with the focus on establishing a consistent methodology for developing of a dust event climatology in Central and East Asia.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 1631 Land/atmosphere interactions (1218, 1843, 3322)
DE: 1632 Land cover change
DE: 1637 Regional climate change
DE: 3355 Regional modeling
SC: Global Environmental Change [GC]
MN: 2007 Fall Meeting