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| Titel |
Response of the Black Sea methane budget to massive short-term submarine inputs of methane |
| VerfasserIn |
O. Schmale, M. Haeckel, D. F. McGinnis |
| 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 ; 8, no. 4 ; Nr. 8, no. 4 (2011-04-15), S.911-918 |
| Datensatznummer |
250005692
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| Publikation (Nr.) |
 copernicus.org/bg-8-911-2011.pdf |
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| Zusammenfassung |
| A steady state box model was developed to estimate the methane input into
the Black Sea water column at various water depths. Our model results reveal
a total input of methane of 4.7 Tg yr−1. The model predicts that the
input of methane is largest at water depths between 600 and 700 m (7% of
the total input), suggesting that the dissociation of methane gas hydrates
at water depths equivalent to their upper stability limit may represent an
important source of methane into the water column. In addition we discuss
the effects of massive short-term methane inputs (e.g. through eruptions of
deep-water mud volcanoes or submarine landslides at intermediate water
depths) on the water column methane distribution and the resulting methane
emission to the atmosphere. Our non-steady state simulations predict that
these inputs will be effectively buffered by intense microbial methane
consumption and that the upward flux of methane is strongly hampered by the
pronounced density stratification of the Black Sea water column. For
instance, an assumed input of methane of 179 Tg CH4 d−1
(equivalent to the amount of methane released by 1000 mud volcano
eruptions) at a water depth of 700 m will only marginally influence the
sea/air methane flux increasing it by only 3%. |
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