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| Titel |
Five decades of oxygen trends in the North Atlantic |
| VerfasserIn |
Ilaria Stendardo, Nicolas Gruber |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048192
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| Zusammenfassung |
| Ocean warming is expected to cause a substantial deoxygenation of the ocean’s thermocline.
Prior work in the North Atlantic indicated indeed a substantial loss of dissolved oxygen in its
thermocline, but very few investigations have covered changes over more than 20 years. Since
oxygen measurements have a long history, we potentially can extend the analysis back in
time for several decades. To this end, we built a quality controlled dataset for the
North Atlantic to estimate long-term trends from 1960 to 2009 based on CARINA
and GLODAP (Stendardo et al., 2010), augmented with selected cruises from the
World Ocean Database (WOD05). Oxygen trends were estimated along isopycnal
surfaces for 8 regions using linear regression with bootstrapping. Our results show a
decrease of oxygen in Intermediate and Mode waters in almost all regions over
the last 5 decades, with an average rate of -1.5±1.4 μmol kg-1 decade-1. The
most substantial decrease occurred in the Western European Basin from 30Ë N to
53Ë N and in the northern part of the Newfoundland basin. In contrast, oxygen
increased in the Labrador Sea Water throughout the North Atlantic. Integrated over
each water mass, the change of oxygen over the last 49 years amounts to a loss of
-37.9±13.2 Tmol for the Mode waters (30.9< Ïă1 |
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