Understanding Wind Profiler Observations of Stratocumulus-Topped Marine Boundary Layer

Saturday, October 29, 2011
Hall 1-2 (San Jose Convention Center)
Javier Lujan , University of Texas at El Paso, El Paso, TX
Leslie Hartten, PhD , Physical Sciences Division, NOAA/Earth System Research Laboratory, Boulder, CO
Marine stratocumulus (Sc) clouds occur over cool ocean waters off the west costs of continents and have an impact on Earth’s radiation budget. By having more information of the marine Sc better modeling can be done on Sc and Energy budget over the oceans.

While the immediate problem of this research is not to measure the thickness of Sc, it is closely related and is part of future research. The main issue is trying to determine what the wind profiler observations over the eastern Pacific Ocean are telling us with the help of ceilometer data. While most profilers are used to measure horizontal winds, the one used in this research displayed three different variables: reflectivity, vertical velocity, and spectral width. The data collected and used was obtained from the Pan American Climate Study (PACS) 2004 research cruise which took place over the eastern Pacific Ocean off the coast of South America. A possible observation that the wind profiler displays may be the marine boundary layer (MBL), which is seen as a bright line in the reflectivity at around 1.5 km high because of the enhanced reflectivity from the humidity and temperature gradients. Research is still ongoing, but the MBL hypothesis will be further analyzed. 

If concluded to be the marine boundary layer, then future research can be done to calculate the thickness of Sc and better understand their role in Earth’s energy budget.