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| Titel |
Impact of global ocean model resolution on sea-level variability with emphasis on interannual time scales |
| VerfasserIn |
T. Penduff, M. Juza, L. Brodeau, G. C. Smith, B. Barnier, J.-M. Molines, A.-M. Treguier, G. Madec |
| 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 ; 6, no. 1 ; Nr. 6, no. 1 (2010-02-25), S.269-284 |
| Datensatznummer |
250003359
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| Publikation (Nr.) |
 copernicus.org/os-6-269-2010.pdf |
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| Zusammenfassung |
| Four global ocean/sea-ice simulations driven by the same realistic 47-year
daily atmospheric forcing were performed by the DRAKKAR group at 2°, 1°, ½°, and ¼° resolutions. Simulated mean sea-surface heights (MSSH) and
sea-level anomalies (SLA) are collocated over the period 1993–2004 onto the
AVISO dataset. MSSH fields are compared with an inverse estimate. SLA
datasets are filtered and compared over various time and space scales with
AVISO regarding three characteristics: SLA standard deviations, spatial
correlations between SLA variability maps, and temporal correlations between
observed and simulated band-passed filtered local SLA timeseries. Beyond the
2°−1° transition whose benefits are moderate, further increases in
resolution and associated changes in subgrid scale parameterizations
simultaneously induce (i) strong increases in SLA standard deviations, (ii)
strong improvements in the spatial distribution of SLA variability, and (iii)
slight decreases in temporal correlations between observed and simulation SLA
timeseries. These 3 effects are not only clear on mesoscale (14–180 days)
and quasi-annual (5–18 months) fluctuations, but also on the slower
(interannual), large-scale variability ultimately involved in
ocean-atmosphere coupled processes. Most SLA characteristics are
monotonically affected by successive resolution increases, but irregularly
and with a strong dependance on frequency and latitude. Benefits of enhanced
resolution are greatest in the 1°−½° and ½°−¼° transitions, in
the 14–180 day range, and within eddy-active mid- and high-latitude regions.
In the real ocean, most eddy-active areas are characterized by a strong SLA
variability at all timescales considered here; this localized, broad-banded
temporal variability is only captured at ¼° resolution. |
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