The advective origin of an under-ice spring bloom in the Arctic Ocean using multiple observational platforms
| Autor: | Marit Norli, Cecilie von Quillfeldt, Geir Johnsen, Ian Robbins, Jørgen Berge, Mark A. Moline, Finlo Cottier, Kai Sørensen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Water mass 010504 meteorology & atmospheric sciences Photoacclimation Advection of cells Chlorophyll a Biology 01 natural sciences Water column Arctic Phytoplankton Sea ice Autonomous underwater vehicle VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 Pulse amplitude modulated fluorescence (PAM) 0105 earth and related environmental sciences geography Original Paper geography.geographical_feature_category Sea-ice algae 010604 marine biology & hydrobiology Chaetoceros VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 Spring bloom biology.organism_classification Oceanography Satellite Under-ice bloom General Agricultural and Biological Sciences Bloom |
| Zdroj: | Polar Biology |
| Popis: | Source at https://doi.org/10.1007/s00300-018-2278-5. Under-ice blooms of phytoplankton in the Chukchi Sea have been observed, with strong implications for our understanding of the production regimes in the Arctic Ocean. Using a combination of satellite remote sensing of phytoplankton biomass, in situ observations under sea ice from an autonomous underwater vehicle (AUV), and in vivo photophysiology, we examined the composition, magnitude and origin of a bloom detected beneath the sea ice Northwest of Svalbard (Southern Yermak Plateau) in May 2010. In situ concentration of up to 20 mg chlorophyll a [Chl a] m−3, were dominated by the northern planktonic spring species of diatoms, Thalassiosira nordenskioeldii, T. antarctica var. borealis, Chaetoceros socialis species complex and Fragilariopsis oceanica. These species were also found south of the marginal ice zone (MIZ). Cells in the water column under the sea ice were typically high-light acclimated, with a mean light saturation index (Ek) of 138 μmol photons m−2 s−1 and a ratio between photoprotective carotenoids (PPC) and Chl a (w:w) of 0.2. Remotely sensed data of [Chl a] showed a 32,000 km2 bloom developing south of the MIZ. In effect, our data suggest that the observed under-ice bloom was in fact a bloom developed in open waters south of the ice edge, and that a combination of northward-flowing water masses and southward drifting sea ice effectively positioned the bloom under the sea ice. This have implications for our general understanding of under-ice blooms, suggesting that their origin and connection with open water may be different in different regions of the Arctic. |
| Databáze: | OpenAIRE |
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