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Stable isotopes measurements reveal dual carbon pools contributing to organic matter enrichment in marine aerosol.


ABSTRACT: Stable carbon isotope ratios in marine aerosol collected over the Southern Indian Ocean revealed ?(13)C values ranging from -20.0‰ to -28.2‰. The isotope ratios exhibited a strong correlation with the fractional organic matter (OM) enrichment in sea spray aerosol. The base-level isotope ratio of -20.0‰ is characteristic of an aged Dissolved Organic Matter (DOM) pool contributing a relatively homogeneous background level of DOM to oceanic waters. The range of isotope ratios, extending down to -28.2‰, is characteristic of more variable, stronger, and fresher Particulate Organic Matter (POM) pool driven by trophic level interactions. We present a conceptual dual-pool POM-DOM model which comprises a 'young' and variable POM pool which dominates enrichment in sea-spray and an 'aged' but invariant DOM pool which is, ultimately, an aged end-product of processed 'fresh' POM. This model is harmonious with the preferential enrichment of fresh colloidal and nano-gel lipid-like particulate matter in sea spray particles and the observed depleted ?(13)C ratio resulting from isotope equilibrium fractionation coupled with enhanced plankton photosynthesis in cold water (-2?°C to +8?°C). These results re-assert the hypothesis that OM enrichment in sea-spray is directly linked to primary production and, consequently, can have implications for climate-aerosol-cloud feedback systems.

SUBMITTER: Ceburnis D 

PROVIDER: S-EPMC5098177 | biostudies-other | 2016 Nov

REPOSITORIES: biostudies-other

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Stable isotopes measurements reveal dual carbon pools contributing to organic matter enrichment in marine aerosol.

Ceburnis Darius D   Masalaite Agne A   Ovadnevaite Jurgita J   Garbaras Andrius A   Remeikis Vidmantas V   Maenhaut Willy W   Claeys Magda M   Sciare Jean J   Baisnée Dominique D   O'Dowd Colin D CD  

Scientific reports 20161107


Stable carbon isotope ratios in marine aerosol collected over the Southern Indian Ocean revealed δ<sup>13</sup>C values ranging from -20.0‰ to -28.2‰. The isotope ratios exhibited a strong correlation with the fractional organic matter (OM) enrichment in sea spray aerosol. The base-level isotope ratio of -20.0‰ is characteristic of an aged Dissolved Organic Matter (DOM) pool contributing a relatively homogeneous background level of DOM to oceanic waters. The range of isotope ratios, extending do  ...[more]

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