Coupling between ocean biota and atmospheric aerosols: Dust, dimethylsulphide, or artIfact?

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Title Coupling between ocean biota and atmospheric aerosols: Dust, dimethylsulphide, or artIfact?
Author Cropp, Roger Allan; Gabric, Albert Jerome; McTainsh, Grant Harvey; Braddock, Roger David; Tindale, Neil
Journal Name Global Biogeochemical Cycles
Editor Mheinrat Andreae
Year Published 2005
Place of publication Washington DC, USA
Publisher American Geophysical Union
Abstract Two hypotheses that postulate interactions between ocean biota and aerosols in the atmosphere have generated substantial research into marine systems. The stimulation of phytoplankton photosynthesis by the provision of iron, a micronutrient contained in deposited aeolian dust, (the "Iron Hypothesis"), and the contribution of dimethylsulphide (DMS) produced by marine ecosystems to the atmospheric burden of aerosols (the "CLAW Hypothesis") have been the focus of much research. Satellite sensors, such as the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) now provide moderate-resolution time series of measurements of the optical properties of the oceans and atmosphere over most of the earth's surface. These data provide an unprecedented opportunity to investigate the ubiquity of biotic linkages between the ocean and atmosphere at the global scale. We analysed five years of SeaWiFS 8-day fields of two variables, chlorophyll concentration and aerosol optical depth, for the global oceans. This first global, multi-year approach does not yet allow unequivocal conclusions as satellite measurements of chlorophyll can be influenced by aerosol properties of the atmosphere and several variables we do not yet examine are likely to play a role. We find correlation between optical properties of the ocean and atmosphere over much of the globe, in particular the mid-latitudes. While some regional analyses indicate that SeaWiFS chlorophyll retrievals are biased by dust in the atmosphere, our results do not support the existence of widespread bias in the SeaWiFS products, but are consistent with global-scale couplings posited by the Iron and CLAW hypotheses.
Peer Reviewed Yes
Published Yes
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Copyright Statement Copyright 2005 American Geophysical Union. Reproduced in accordance with the copyright policy of the publisher. This journal is available online, use hypertext links.
Volume 19
Issue Number 4
Page from 1
Page to 21
ISSN 0886-6236
Date Accessioned 2006-02-10
Language en_AU
Research Centre Australian Rivers Institute
Faculty Faculty of Environmental Sciences
Subject PRE2009-Environmental Sciences
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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