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Webinar: The role of the land surface in weather and climate
Tuesday, 04 September 2018, 1:00
Tuesday, September 4, 2018. 1:00PM Eastern. Webinar: The role of the land surface in weather and climate. Paul Dirmeyer, George Mason University. Sponsored by UCAR | NCAR CGD: Climate & Global Dynamics. More information here.
Abstract: Similar to the ocean, the land surface is a slow manifold relative to the atmosphere that provides predictability and prediction skill across a range of time scales. Landatmosphere feedbacks occur when and where three ingredients are in place: sensitivity (a.k.a. coupling), variability and memory (persistence of land anomalies). Although the peak influence of land surface states like soil moisture is in the “sub-seasonal” time range between 1-3 weeks, significant impact of land and errors in its representation begin the first day of simulation, and manifest at all time scales. The process chains that link soil moisture, vegetation, snow, and other land states through the energy and water cycles manifest through their effects on the growing daytime boundary layer, cloud formation and convection. Thus, the diurnal cycle is key to assessing and improving model performance related to landatmosphere interactions. We show evidence of land surface impacts from a variety of global weather and climate models and highlight some current shortcomings that may inform model development.