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| Titel |
Organic matter dynamics and CO2 responses of the 2010 Svalbard mesocosm experiment |
| VerfasserIn |
Kai G. Schulz, Richard G. J. Bellerby, Anja Engel, Jean-Pierre Gattuso, Dag O. Hessen, Signe Klavsen, Sebastian A. Krug, Gisle Nondal, Anna Silyakova, Ulf Riebesell |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250051143
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| Zusammenfassung |
| In June/July 2010 nine mesocosms were moored in the Kongsfjord off Spitsbergen each
enclosing about 50Â m3 of nutrient poor fjord water. Additions of CO2 enriched seawater
between day t0 and t4 established a gradient of CO2 partial pressures ranging from about 180
to 1400 μatm. A relatively weak phytoplankton bloom developed in all mesocosms mainly
fueled by dissolved inorganic phosphorus, ammonia and dissolved organic nitrogen, peaking
between day t6 and t10. After this bloom 5 μmoll-1 of nitrate and 0.32 μmoll-1 of
phosphate were added to all mesocosms on day t13. The timing of the second bloom,
however, was different between CO2 treatments. While standing stocks of organic biomass
peaked between day t18 and t20 at elevated CO2 levels, the peak was delayed by almost a
week at the lower CO2 levels (between day t25 and t30). This phenomenon was
probably related to differences in inorganic nutrient utilization which started earlier at
elevated CO2. Here we present water-column dynamics of particulate and dissolved
organic and inorganic carbon, nitrogen and phosphorus during the experiment. |
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