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  4. An evaluation of long-term physical and hydrochemical measurements at the Sylt Roads Marine Observatory (1973–2019), Wadden Sea, North Sea
 
Verlagslink DOI
10.5194/essd-15-1037-2023

An evaluation of long-term physical and hydrochemical measurements at the Sylt Roads Marine Observatory (1973–2019), Wadden Sea, North Sea

Veröffentlichungsdatum
2023
Autoren
Rick, Johannes J.  
Scharfe, Mirco  
Romanova, Tatyana  
van Beusekom, Justus E.E.  
Asmus, Ragnhild  
Asmus, Harald  
Mielck, Finn  
Kamp, Anja  
Sieger, Rainer  
Wiltshire, Karen  
Zusammenfassung
The Sylt Roads pelagic time series covers physical and hydrochemical parameters at five neighboring stations in the Sylt–Rømø bight, Wadden Sea, North Sea. Since the beginning of the time series in 1973, sea surface temperature (SST), salinity, ammonium, nitrite, nitrate, and soluble reactive phosphorus (SRP) have been measured twice a week. The other parameters were introduced later (dissolved silicate (Si) since 1974, pH since 1979, dissolved organic nitrogen (DON) since 1996, dissolved organic phosphorus (DOP) since 2001, chlorophyll a since 1979, and suspended particulate matter (SPM) since 1975), and in the case of dissolved oxygen, were already discontinued (1979–1983). In the years 1977, 1978, and 1983, no sampling took place. Since the start of the continuous sampling in 1984, the sea surface temperature in the bight has risen by +1.11 ∘C, with the highest increases during the autumn months, while the pH and salinity decreased by 0.23 and 0.33 units, respectively. Summer and autumn salinities are generally significantly elevated compared to spring and winter conditions. Dissolved nutrients (ammonium, nitrite, nitrate, and SRP) have displayed periods of intense eutrophication (1973–1998) and de-eutrophication since 1999. Silicate has shown significantly higher winter levels since 1999. Interestingly, phytoplankton parameters did not mirror these large changes in nutrient concentrations, as a seasonal comparison of the two eutrophication periods showed no significant differences with regard to chlorophyll a. This phenomenon might be triggered by an important switch in nutrient limitation during the time series. With regard to nutrients, the phytoplankton was probably primarily limited by silicate until 1998, while, since 1999, the SRP limitation has become increasingly important. All data are available in Rick et al. (2017b–e, 2020a–o) from https://doi.org/10.1594/PANGAEA.150032, https://doi.org/10.1594/PANGAEA.873549
https://doi.org/10.1594/PANGAEA.873545
https://doi.org/10.1594/PANGAEA.873547
https://doi.org/10.1594/PANGAEA.918018
https://doi.org/10.1594/PANGAEA.918032
https://doi.org/10.1594/PANGAEA.918027
https://doi.org/10.1594/PANGAEA.918023
https://doi.org/10.1594/PANGAEA.918033
https://doi.org/10.1594/PANGAEA.918028
https://doi.org/10.1594/PANGAEA.918024
https://doi.org/10.1594/PANGAEA.918034
https://doi.org/10.1594/PANGAEA.918029
https://doi.org/10.1594/PANGAEA.918025
https://doi.org/10.1594/PANGAEA.918035
https://doi.org/10.1594/PANGAEA.918030
https://doi.org/10.1594/PANGAEA.918026
https://doi.org/10.1594/PANGAEA.918036
https://doi.org/10.1594/PANGAEA.918031
Schlagwörter
sea surface temperature
Verlag
Copernics Publications
Institution
Hochschule Bremen  
Fachbereich
Hochschule Bremen - Fakultät 5: Natur und Technik  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Earth System Science Data  
Band
15
Heft
3
Startseite
1037
Endseite
1057
Sprache
Englisch

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