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| Titel |
Apparent oxygen utilization rates calculated from tritium and helium-3 profiles at the Bermuda Atlantic Time-series Study site |
| VerfasserIn |
R. H. R. Stanley, S. C. Doney, W. J. Jenkins, D. E. Lott III |
| 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 ; 9, no. 6 ; Nr. 9, no. 6 (2012-06-04), S.1969-1983 |
| Datensatznummer |
250007112
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| Publikation (Nr.) |
 copernicus.org/bg-9-1969-2012.pdf |
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| Zusammenfassung |
| We present three years of Apparent Oxygen Utilization Rates (AOUR) estimated
from oxygen and tracer data collected over the ocean thermocline at monthly
resolution between 2003 and 2006 at the Bermuda Atlantic Time-series Study
(BATS) site. We estimate water ages by calculating a transit time
distribution from tritium and helium-3 data. The vertically integrated AOUR
over the upper 500 m, which is a regional estimate of export, during the
three years is 3.1 ± 0.5 mol O2 m−2 yr−1. This is
comparable to previous AOUR-based estimates of export production at the BATS
site but is several times larger than export estimates derived from sediment
traps or 234Th fluxes. We compare AOUR determined in this study to AOUR
measured in the 1980s and show AOUR is significantly greater today than
decades earlier because of changes in AOU, rather than changes in
ventilation rates. The changes in AOU are likely a methodological artefact
associated with problems with early oxygen measurements. |
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