A simple relationship between cloud drop number concentration and precursor aerosol concentration for the regions of Earth's large marine stratocumulus decks

by D. a. Hegg, D. S. Covert, H. H. Jonsson, R. K. Woods
Atmospheric Chemistry and Physics ()


Aircraft-based measurements of cloud condensation nuclei (CCN),\naccumulation mode and Aitken mode number concentrations, cloud drop\nnumber concentration (CDNC), and selected ancillary measurements are\npresented for the three large, semi-permanent marine stratocumulus decks\nof the earth (in the Pacific offshore of California and Chile and in the\nAtlantic offshore of Namibia). Based on these data, a simple linear\nrelationship between CDNC and the accumulation mode number concentration\n(AMNC) is derived via regression. The slope of the regression is 0.72\n+/- 0.04 with an R-2 of 0.90, higher than those found for CDNC-CCN\nlinear regressions. Explanations of the relatively favorable CDNC-AMNC\nrelationship and its utility for climate studies are discussed.

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Available from www.atmos-chem-phys.net
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