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Estimating the portion of Marine Cloud Brightening sea-salt aerosols that activate when incorporated into low-lying marine clouds: preliminary results

Authors

Hernandez-Jaramillo,  Diana C.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Medcraft,  Chris
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Braga,  Ramon C.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rosenfeld,  Daniel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Harrison,  Daniel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Hernandez-Jaramillo, D. C., Medcraft, C., Braga, R. C., Rosenfeld, D., Harrison, D. (2023): Estimating the portion of Marine Cloud Brightening sea-salt aerosols that activate when incorporated into low-lying marine clouds: preliminary results, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2669


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019225
Abstract
Airborne measurements were carried out as part of the Australian Marine Cloud Brightening (MCB) campaign performed between mid-February and early April 2023 in the Southern part of the Great Barrier Reef (GBR). MCB may have the potential to mitigate episodic bleaching events exacerbated by climate change at the scale of the GBR by the aerosol direct effect and indirect effects on aerosol optical depth and net albedo of low-level maritime clouds respectively. During the campaign experiments were conducted by atomising seawater at the stern of a research vessel at a target production rate of approximately 10^14 s^-1 sea salt aerosols (SSA). Sampling measurements were performed from a Cessna 337 aircraft equipped to measure aerosols, cloud properties and meteorological conditions. The sampling strategy included consecutive transects at cloud base at the intersection of the sea salt aerosol (SSA) plume and low-level maritime clouds, followed by in-cloud sampling of perturbed clouds. In this study I aim to determine the actual production rate of SSA achieved, and what portion are incorporated into cloud and subsequently activated to form cloud droplets as a function of boundary layer conditions and turbulence. This work was undertaken as part of the Reef Restoration and Adaptation Program, funded by the partnership between the Australian Governments Reef Trust and the Great Barrier Reef Foundation.