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UC Irvine Extends Climate Research With IBM Supercomputer
6/29/2004
First Discovery
Our first project involves the emission and long-range transport of mineral aerosols. We used the ESMF to probe the physical causes and biogeochemical and climate consequences of large desert dust particles, and found a huge discrepancy between previous simulations, which underestimated the abundance of these particles, and our observations. Remote regions such as the Southern Ocean near the Antarctic may receive inputs of dust-borne nutrients like iron much less regularly, and in much larger-sized particles, than currently thought.
The ESMF makes possible new simulations that will include the complex, time-consuming, physical processes we have shown are responsible for greater emissions of large desert dust particles. We will soon run new, coupled simulations, which address the previous biases of dust on climate and biogeochemistry. These will have fewer surfaces cooling, more atmospheric heating, and more variable dust fertilization of ocean biogeochemistry than current models.
Our improved dust distributions will strengthen radiative feedbacks in dust source regions and weaken them afar. We believe these results will show that dust is more capable of drying out arid regions, and generating more dust than previously thought.
Charlie Zender (zender@uci.edu) is assistant professor of the Department of Earth System Science at the University of California-Irvine.
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