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Preprints
https://doi.org/10.5194/acpd-14-18943-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/acpd-14-18943-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

  21 Jul 2014

21 Jul 2014

Review status
This preprint was under review for the journal ACP but the revision was not accepted.

Long-term observation of aerosol–cloud relationships in the Mid-Atlantic of the United States

S. Li1, E. Joseph1, Q. Min2, and B. Yin2 S. Li et al.
  • 1Howard University, 2355 6th Street, NW, Washington DC, 20059, USA
  • 2Atmospheric Sciences Research Center, State University of New York at Albany, Albany, NY 12203, USA

Abstract. Long-term ground-based observations (2006 to 2010) of aerosol and cloud properties derived from passive radiometric sensors deployed at an atmospheric measurement field station in the Baltimore–Washington corridor operated by Howard University were used to examine aerosol indirect effect on cloud optical depth (COD), liquid water path (LWP), cloud droplets effective radius (Re) and cloud droplets number concentration (Nd). A higher frequency of clouds with large COD (> 20) and small Re (< 7 m) was found during summer of 2006 and 2007 along with higher frequency of abundant aerosol loading. The five-year data are screened for summer months only and are separated into clean and polluted cases based on aerosol particulate matter with aerodynamic diameter ≤ 2.5 m (PM2.5) value. Evidence of aerosol indirect effect is found where for polluted cases the mean and median values of COD and Nd distributions were elevated while the mean and median values of Re were decreased. Further reinforcing this conclusion is the result that the mean and median values of LWP distributions did not show prominent difference between clean and polluted cases, this implies that differences between the two cases of influential factors on cloud properties were relatively controlled. Moreover aerosol indirect effects were found insignificant when LWP was small but significant when LWP was large through the analysis of sensitivity of Nd to LWP under different aerosol loading and the measurements of aerosol size distribution.

S. Li et al.

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S. Li et al.

S. Li et al.

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