Wind‐Driven and Seasonal Effects on Marine Aerosol Production in the Bellingshausen Sea, Antarctica

• Published in: Geophysical Research Letters
• Main Authors: S. Dasarathy, L. M. Russell, S. D. Rodier, J. S. Bowman
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2023
• Subjects: marine aerosol; remote sensing; antarctic peninsula; southern ocean; Bellingshausen Sea; AOD; Geophysics. Cosmic physics; QC801-809; Antarc*; Antarctic; Antarctic Peninsula; Antarctica; Southern Ocean
• Online Access: https://doi.org/10.1029/2022GL099723; https://doaj.org/article/9ca4bd3b41d8400ca36ac61aa2db8ec7

Abstract We assessed satellite‐retrieved marine aerosol in the western Antarctic Peninsula (WAP) across a 12‐year period from coarse‐mode aerosol optical depth (AODC), often used as a proxy for sea spray aerosol (SSA), and marine aerosol optical depth (MAOD), a newly developed proxy for tropospheric marine aerosol. Across open ocean to coastal regions, daily fluctuations in nighttime and daytime winds, respectively, drove increasing MAOD and AODC. MAOD depicted strong correlations with wind speed across open ocean and weak correlations in coastal regions. In the open ocean, AODC exhibited a very weak significant correlation to wind speed and a weak significant correlation to sea surface temperature (SST). We thus observed that warmer SST enhanced the production of SSA, supporting prior studies. This is the first study to assess patterns of AODC in the WAP. In contrast to the tropical Pacific, seasonal patterns showed that biological activity likely contributed toward MAOD and AODC magnitudes.