Atmos. Chem. Phys. Discuss., 10, 3301-3318, 2010
www.atmos-chem-phys-discuss.net/10/3301/2010/
doi:10.5194/acpd-10-3301-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
A comparison of ship and satellite measurements of cloud properties in the southeast Pacific stratus deck
M. A. Brunke1, S. P. de Szoeke2, P. Zuidema3, and X. Zeng1
1The University of Arizona, Department of Atmospheric Sciences, Tucson, Arizona, USA
2Oregon State University, College of Oceanic and Atmospheric Sciences, Corvallis, Oregon, USA
3University of Miami, Rosentiel School of Marine and Atmospheric Science, Miami, Florida, USA

Abstract. Here, liquid water path (LWP), cloud fraction, cloud top height, and cloud base height are retrieved by a suite of satellite instruments (the CPR aboard CloudSat, CALIOP aboard CALIPSO, and MODIS aboard Aqua) and compared to ship observations from research cruises made in 2001 and 2003–2007 into the stratus/stratocumulus deck over the southeast Pacific Ocean. It is found that CloudSat LWP is generally too high over this region and the CloudSat/CALIPSO cloud bases are too low which is to be expected from the increased sensitivity to precipitation by both the radar and lidar. This results in a relationship (LWP~h9) between CloudSat LWP and CALIPSO cloud thickness (h) that is very different from the adiabatic relationship (LWP~h2) from in situ observations. Furthermore, comparing results from a global model (CAM3.1) to ship observations reveals that, while the simulated LWP is quite reasonable, the model cloud is too thick and too low, allowing the model to have LWPs that are almost independent of h. Such differences may be reduced in future versions of both the satellite data and the model.

Citation: Brunke, M. A., de Szoeke, S. P., Zuidema, P., and Zeng, X.: A comparison of ship and satellite measurements of cloud properties in the southeast Pacific stratus deck, Atmos. Chem. Phys. Discuss., 10, 3301-3318, doi:10.5194/acpd-10-3301-2010, 2010.
 
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