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| Titel |
Adriatic Sea surface temperature and ocean colour variability during the MFSPP |
| VerfasserIn |
E. Böhm, V. Banzon, E. D'Acunzo, F. D'Ortenzio, R. Santoleri |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 21, no. 1 ; Nr. 21, no. 1, S.137-149 |
| Datensatznummer |
250014549
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| Publikation (Nr.) |
 copernicus.org/angeo-21-137-2003.pdf |
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| Zusammenfassung |
Two years and six months
of night-time Advanced Very High Resolution Radiometer (AVHRR) sea surface
temperature (SST) and daytime Sea viewing Wide Field of view Sensor (SeaWiFS)
data collected during the MFSPP have been used to examine spatial and temporal
variability of SST and chlorophyll (Chl) in the Adriatic Sea. Flows along the
Albanian and the Italian coasts can be distinguished year-round in the monthly
averaged Chl but only in the colder months in the monthly averaged SST’s. The
Chl monthly-averaged fields supply less information on circulation features
away from coastal boundaries and where conditions are generally oligotrophic,
except for the early spring bloom in the Southern Adriatic Gyre. To better
characterise the year-to-year and seasonal variability, exploratory data
analysis techniques, particularly the plotting of multiple Chl-SST histograms,
are employed to make joint quantitative use of monthly-averaged fields. Modal
water mass (MW), corresponding to the Chl-SST pairs in the neighbourhood of the
maximum of each monthly histogram, are chosen to represent the temporal and
spatial evolution of the prevalent processes and their variability in the
Adriatic Sea. Over an annual cycle, the MW followed a triangular path with the
most pronounced seasonal and interannual variations in both Chl-SST properties
and spatial distributions of the MW in the colder part of the year. The winter
of 1999 is the colder (by at least 0.5°C) and most eutrophic (by 0.2 mg/m
3). The fall of the year 2000 is characterised by the lack of cooling in
the month of November that was observed in the previous year. In addition to
characterising the MW, the two-dimensional histogram technique allows a
distinction to be made between different months in terms of the spread of SST
values at a given Chl concentration. During spring and summer, the spread is
minimal indicating surface homothermal conditions. In fall and winter, on the
other hand, a spread of points suggesting a linear negative correlation between
SST and Chl is found. This behaviour is related to the high nutrient content of
cooler water associated with upwelling or the Po River fresh water outflow.
Key words. Oceanography: general
(diurnal, seasonal and annual cycles; marginal and semi-enclosed seas; water
masses) |
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