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Published Online August 15, 2002
Science DOI: 10.1126/science.1073869

Research Articles

Submitted on May 13, 2002
Accepted on August 5, 2002

The Role of Sea Spray in Cleansing Air Pollution over Ocean via Cloud Processes

Daniel Rosenfeld 1, Ronen Lahav 1, Alexander Khain 1, Mark Pinsky 1

1 Institute of Earth Sciences, the Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Particulate air pollution has been shown to strongly suppress precipitation from convective clouds over land. New observations show that precipitation from similar polluted clouds over ocean is much less affected, because large sea salt nuclei override the precipitation suppression effect of the large number of small pollution nuclei. Raindrops initiated by the sea salt grow by collecting small cloud droplets that form on the pollution particles, thereby cleansing the air. Therefore, sea salt helps cleansing the atmosphere of the air pollution, via cloud processes. This implies that over oceans the climatic aerosol indirect effects are significantly smaller than current estimates.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)