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Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

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Modelling artificial sea salt emission in large eddy simulations.

Z Maalick¹, H Korhonen², H Kokkola³

¹Department of Applied Physics, University of Eastern Finland, PO Box 1627, Kuopio 70211, Finland zubairm@uef.fi.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

|November 19, 2014

Summary

Marine cloud brightening research shows that aerosol water evaporation causes cooling, delaying sea salt particle dispersion. This effect increases particle scavenging, highlighting the importance of high-resolution modeling for emission source design.

Keywords:

geoengineering large eddy simulation marine cloud brightening sea salt

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Area of Science:

Atmospheric Science
Cloud Physics
Aerosol Science

Background:

Designing effective marine cloud brightening emission sources requires understanding aerosol processes.
Previous studies lacked explicit treatment of aerosol water's impact on particle dispersion and buoyancy.

Purpose of the Study:

To investigate sea salt particle dispersion from artificial sea spray injections at a cloud-resolving scale.
To quantify the effects of aerosol water condensation and evaporation on particle dispersion and ambient temperature.

Main Methods:

Utilized a cloud-resolving scale model with explicit treatment of aerosol water.
Incorporated condensation, evaporation, and their impact on ambient temperature.
Employed higher model resolution to capture near-source aerosol loss via coagulation.

Main Results:

Evaporation-induced cooling (up to 1.4 K) delayed particle dispersion by 10-20 minutes for a seawater flux of 15 kg s⁻¹.
Aerosol water increased particle scavenging by a factor of 1.14 compared to simulations without it.
Cooling and dispersion were resolution-dependent, with maximum scavenging of 20% at 50m resolution within 5 hours.

Conclusions:

Aerosol water significantly influences sea salt particle dispersion and scavenging in marine cloud brightening.
High-resolution modeling is crucial for accurately simulating these processes and designing effective emission strategies.
Further regional, high-resolution studies modeling extended injection periods are recommended.