A simple relationship between cloud drop number concentration and precursor aerosol concentration for the regions of Earth's large marine stratocumulus decks 1Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA
01 Feb 2012
2Meteorology Department, Naval Post Graduate School, Monterey, CA, USA
Received: 12 Oct 2011 – Published in Atmos. Chem. Phys. Discuss.: 25 Oct 2011Abstract. Aircraft–based measurements of cloud condensation nuclei (CCN),
accumulation mode and Aitken mode number concentrations, cloud drop number
concentration (CDNC), and selected ancillary measurements are presented for
the three large, semi-permanent marine stratocumulus decks of the earth (in
the Pacific offshore of California and Chile and in the Atlantic offshore of
Namibia). Based on these data, a simple linear relationship between CDNC and
the accumulation mode number concentration (AMNC) is derived via regression.
The slope of the regression is 0.72 ± 0.04 with an R2 of 0.90,
higher than those found for CDNC-CCN linear regressions. Explanations of the
relatively favorable CDNC-AMNC relationship and its utility for climate
studies are discussed.
Revised: 11 Jan 2012 – Accepted: 19 Jan 2012 – Published: 01 Feb 2012
Citation: Hegg, D. A., Covert, D. S., Jonsson, H. H., and Woods, R. K.: A simple relationship between cloud drop number concentration and precursor aerosol concentration for the regions of Earth's large marine stratocumulus decks, Atmos. Chem. Phys., 12, 1229-1238, doi:10.5194/acp-12-1229-2012, 2012.