Natural marine cloud brightening in the Southern Ocean

Mace, Gerald G.; Benson, Sally; Humphries, Ruhi; Gombert, Peter M.; Sterner, Elizabeth

doi:10.5194/acp-23-1677-2023

Title: Natural marine cloud brightening in the Southern Ocean

Journal Article · Wed Feb 01 00:00:00 EST 2023 · Atmospheric Chemistry and Physics (Online)

DOI:https://doi.org/10.5194/acp-23-1677-2023· OSTI ID:1922999

;

; Gombert, Peter M.; Sterner, Elizabeth

The number of cloud droplets per unit volume (N_d) is a fundamentally important property of marine boundary layer (MBL) liquid clouds that, at constant liquid water path, exerts considerable controls on albedo. Past work has shown that regional N_d has a direct correlation to marine primary productivity (PP) because of the role of seasonally varying, biogenically derived precursor gases in modulating secondary aerosol properties. These linkages are thought to be observable over the high-latitude oceans, where strong seasonal variability in aerosol and meteorology covary in mostly pristine environments. Here, we examine N_d variability derived from 5 years of MODIS Level 2-derived cloud properties in a broad region of the summer eastern Southern Ocean and adjacent marginal seas. We demonstrate latitudinal, longitudinal and temporal gradients in N_d that are strongly correlated with the passage of air masses over high-PP waters that are mostly concentrated along the Antarctic Shelf poleward of 60°S. We find that the albedo of MBL clouds in the latitudes south of 60°S is significantly higher than similar liquid water path (LWP) clouds north of this latitude.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM) Data Center

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Contributing Organization:: Pacific Northwest National Laboratory (PNNL); Brookhaven National Laboratory (BNL); Argonne National Laboratory (ANL); Oak Ridge National Laboratory (ORNL)

Grant/Contract Number:: SC00222001; DESC0018995; SC0018995; SC0022200; 80NSSC21k1969

OSTI ID:: 1922999

Alternate ID(s):: OSTI ID: 1958432

Journal Information:: Atmospheric Chemistry and Physics (Online), Journal Name: Atmospheric Chemistry and Physics (Online) Vol. 23 Journal Issue: 2; ISSN 1680-7324

Publisher:: Copernicus GmbHCopyright Statement

Country of Publication:: Germany

Language:: English

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