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| Titel |
How well can we derive Global Ocean Indicators from Argo data? |
| VerfasserIn |
K. Schuckmann, P.-Y. Traon |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 7, no. 6 ; Nr. 7, no. 6 (2011-11-22), S.783-791 |
| Datensatznummer |
250004870
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| Publikation (Nr.) |
 copernicus.org/os-7-783-2011.pdf |
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| Zusammenfassung |
| Argo deployments began in the year 2000 and by November 2007, the array
reached its initial goal of 3000 floats operating worldwide. In this study,
Argo temperature and salinity measurements during the period 2005 to 2010 are
used to estimate Global Ocean Indicators (GOIs) such as global ocean heat
content (GOHC), global ocean freshwater content (GOFC) and global steric sea
level (GSSL). We developed a method based on a simple box averaging scheme
using a weighted mean. Uncertainties due to data processing methods and
choice of climatology are estimated. This method is easy to implement and run
and can be used to set up a routine monitoring of the global ocean. Over the
six year time period, trends of GOHC and GSSL are
0.54 ± 0.1 W m−2 and 0.75 ± 0.15 mm yr−1,
respectively. The trend of GOFC is barely significant. Results show that
there is significant interannual variability at global scale, especially for
GOFC. Annual mean GOIs from the today's Argo sampling can be derived with an
accuracy of ±0.11 cm for GSSL, ±0.22 × 108 J m−2 for GOHC, and
±700 km3 for GOFC. Long-term trends (15 yr) of GOIs based on the
complete Argo sampling for the upper 1500 m depth can be estimated with an
accuracy of ±0.04 mm yr−1 for GSSL, ±0.02 W m−2 for GOHC and ±20 km3 yr−1
for GOFC – under the assumption that no systematic errors remain in
the observing system. |
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