Effects of Aerosol on Cloud Liquid Water Path: Statistical Method a Potential Source for Divergence in Past Observation Based Correlative StudiesReport as inadecuate




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1

Earth and Environmental Sciences Department, Graduate Center, The City University of New York, New York, NY 10031, USA

2

Cooperative Remote Sensing Science and Technology CREST Institute, City University of New York, New York, NY 10031, USA





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Author to whom correspondence should be addressed.



Academic Editor: Toshihiko Takemura

Abstract Studies show a divergence in correlation between aerosol and cloud proxies, which has been thought of in the past as the results of varying physical mechanisms. Though modeling studies have supported this idea, from an observational standpoint it is difficult to attribute with confidence the correlations to specific physical mechanisms. We explore a methodology to assess the correlation between cloud water path and aerosol optical depth using Moderate-resolution Imaging Spectroradiometer MODIS Aqua retrieved aerosol and cloud properties for absorbing and non-absorbing aerosol types over land and over the Atlantic Ocean for various meteorological conditions. The data covers a three-month period, June through August, during which different aerosol types are predominant in specific regions. Our approach eliminates outliers; sorts the data into aerosol bins; and the mean Aerosol Optical Depth AOD value for each bin and the corresponding mean Cloud Water Path CWP value are determined. The mean CWP is plotted against the mean AOD. The response curve for all aerosol types shows a peak CWP value corresponding to an aerosol loading value AODpeak. The peak is used to divide the total range of aerosol loading into two sub ranges. For AOD value below AODpeak, mean CWP and mean AOD are positively correlated. The correlation between mean CWP and mean AOD is negative for aerosol loading above AODpeak. Irrespective of aerosol type, atmospheric water vapor content and lower tropospheric static stability, the peak observed for each aerosol type seems to describe a universal feature that calls for further investigation. It has been observed for a variety of geographical locations and different seasons. View Full-Text

Keywords: cloud water path CWP; aerosol optical depth AOD; correlation cloud water path CWP; aerosol optical depth AOD; correlation





Author: Ousmane Sy Savane 1,* , Brian Vant-Hull 2, Shayesteh Mahani 2 and Reza Khanbilvardi 2

Source: http://mdpi.com/



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