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| Titel |
Influence of terrestrial inputs on continental shelf carbon dioxide |
| VerfasserIn |
L.-Q. Jiang, W.-J. Cai, Y. Wang, J. E. Bauer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 2 ; Nr. 10, no. 2 (2013-02-07), S.839-849 |
| Datensatznummer |
250017504
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| Publikation (Nr.) |
 copernicus.org/bg-10-839-2013.pdf |
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| Zusammenfassung |
| The US South Atlantic Bight (SAB) is a low-latitude
shallow continental shelf bordered landward by abundant salt marshes and
rivers. Based on previously published data on sea surface partial pressure
of carbon dioxide (pCO2) and new dissolved inorganic carbon (DIC) and
dissolved organic carbon (DOC) data, a model analysis is presented to
identify and quantify the contributions of various terrestrial carbon inputs
on SAB sea surface pCO2. After removal of pCO2 variations due to
annual temperature variability and air–sea gas exchange from the in situ
pCO2, the temperature- and gas-exchange-corrected pCO2 (TG-corrected
pCO2) is derived. Contributions from rivers, salt marshes, and the
continental shelf to the TG-corrected pCO2 are then calculated. Our
findings demonstrate that although additions of CO2 from within shelf waters (i.e., ΔpCO2(shelf)) were the
greatest of the three components and underwent the largest seasonal changes,
ΔpCO2(shelf) showed smaller onshore–offshore gradients than
rivers and marshes. In contrast, CO2 contributions from river (ΔpCO2(river)) and salt marsh (ΔpCO2(marsh)) components were
greatest closest to the coast and decreased with distance offshore. In
addition, the magnitude of ΔpCO2(marsh) was about three-fold
greater than ΔpCO2(river). Our findings also revealed that
decomposition of terrestrial organic carbon was an important factor
regulating the seasonal pattern of pCO2 on the inner shelf. Despite
large uncertainties, this study demonstrates the importance of terrestrial
inputs, in particular those from coastal wetlands, on coastal ocean CO2
distributions. |
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