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Ocean Contributions to the Marine Boundary Layer Aerosol Budget
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Journal Article
Ocean Contributions to the Marine Boundary Layer Aerosol Budget
2019
Overview
[...]uncertainty in the origin, number size distribution, and chemical composition of background aerosol complicates the assessments of direct and indirect anthropogenic aerosol forcing and makes it difficult for Earth system science models to accurately predict 21st century climate change. Because effects on climate are estimated from the differences between model simulations with present-day and preindustrial aerosol and precursor emissions, concerns over the global aerosol budget in the absence of anthropogenic influence have sparked renewed interest in the natural emissions of trace gases (acting as particle precursors) and aerosols. A reduction of the uncertainties in the representation of natural aerosols in climate models requires an improved quantification of their number, size distribution, chemical composition, and hygroscopic properties in the marine boundary layer (MBL). Studies have shown that the production rates and physiological properties of SSA and the resulting efficacy to act as CCN or INP can be strongly influenced by the ocean’s biogeochemical state (nutrient availability, pH, bacterial and phytoplankton abundance, eco-physiological factors, and evolutionary drivers). By combining Moderate Resolution Imaging Spectroradiometer (MODIS) and Aerosol Robotic Network (AERONET) AOD retrievals with 2 m wind speed data, the study develops a new power–law relationship between AOD and surface–wind over the oceans.
