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| Titel |
High storage rates of anthropogenic CO2 in the Indian sector of the
Southern Ocean |
| VerfasserIn |
Akihiko Murata, Yu-ichiro Kumamoto, Ken-ichi Sasaki |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250139161
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| Publikation (Nr.) |
 EGU/EGU2017-2341.pdf |
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| Zusammenfassung |
| Using high-quality data for CO2-system and related properties collected 17 years apart
through international observation programs, we examined decadal-scale increases of
anthropogenic CO2 along a zonal section at nominal 62˚ S ranging from 30˚ E to 160˚ E in
the Indian sector of the Southern Ocean. In contrast to previous studies, increases of
anthropogenic CO2 were largest (> 9.0 μmol kg−1) in Antarctic Bottom Water, where little
storage of anthropogenic CO2 has been reported. Significant increases of anthropogenic CO2
in bottom and/or deep waters were detected through the section, although they became
reduced in magnitude and depth range west of 110˚ E. Vertical distributions of anthropogenic
CO2 showed significant positive correlations with decadal-scale changes in CFC-12, a proxy
of circulation and ventilation, meaning that the distributions were mainly controlled by
physical processes. Comparison of increases of anthropogenic CO2 between calculation
methods with and without total alkalinity presented differences of increases of
anthropogenic CO2west of 50˚ E. This is probably because decreases in production
of particulate inorganic carbons in the Southern Ocean. The highest storage rate
of anthropogenic CO2 was estimated to be 1.1 ± 0.6 mol m−2 a−1 at longitudes
130˚ -160˚ E. The results highlight storage rates higher than ever reported in the
Southern Ocean, where very low storage of anthropogenic CO2 has been evidenced. |
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