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| Titel |
Two-dimensional reconstruction of past sea level (1950–2003) from tide gauge data and an Ocean General Circulation Model |
| VerfasserIn |
W. Llovel, A. Cazenave, P. Rogel, A. Lombard, M. B. Nguyen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 5, no. 2 ; Nr. 5, no. 2 (2009-06-23), S.217-227 |
| Datensatznummer |
250002398
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| Publikation (Nr.) |
 copernicus.org/cp-5-217-2009.pdf |
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| Zusammenfassung |
| A two-dimensional reconstruction of past sea level is proposed at yearly
interval over the period 1950–2003 using tide gauge records from 99 selected
sites and 44-year long (1960–2003) 2°×2° sea level grids from the
OPA/NEMO ocean general circulation model with data assimilation. We focus on
the regional variability and do not attempt to compute the global mean
trend. An Empirical Orthogonal Function decomposition of the reconstructed
sea level grids over 1950–2003 displays leading modes that reflect two main
components: (1) a long-term (multi-decadal), regionally variable signal and
(2) an interannual, regionally variable signal dominated by the signature of
El Nino-Southern Oscillation. Tests show that spatial trend patterns of the
54-year long reconstructed sea level significantly depend on the temporal
length of the two-dimensional sea level signal used for the reconstruction
(i.e., the length of the gridded OPA/NEMO sea level time series). On the
other hand, interannual variability is well reconstructed, even when only
~10-years of model grids are used. The robustness of the results is
assessed, leaving out successively each of the 99 tide gauges used for the
reconstruction and comparing observed and reconstructed time series at the
non considered tide gauge site. The reconstruction performs well at most
tide gauges, especially at interannual frequency. |
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