

You have already added 0 works in your ORCID record related to the merged Research product.
You have already added 0 works in your ORCID record related to the merged Research product.
<script type="text/javascript">
<!--
document.write('<div id="oa_widget"></div>');
document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=undefined&type=result"></script>');
-->
</script>
Environmental drivers of under-ice phytoplankton bloom dynamics in the Arctic Ocean

doi: 10.1525/elementa.430
Environmental drivers of under-ice phytoplankton bloom dynamics in the Arctic Ocean
The decline of sea-ice thickness, area, and volume due to the transition from multi-year to first-year sea ice has improved the under-ice light environment for pelagic Arctic ecosystems. One unexpected and direct consequence of this transition, the proliferation of under-ice phytoplankton blooms (UIBs), challenges the paradigm that waters beneath the ice pack harbor little planktonic life. Little is known about the diversity and spatial distribution of UIBs in the Arctic Ocean, or the environmental drivers behind their timing, magnitude, and taxonomic composition. Here, we compiled a unique and comprehensive dataset from seven major research projects in the Arctic Ocean (11 expeditions, covering the spring sea-ice-covered period to summer ice-free conditions) to identify the environmental drivers responsible for initiating and shaping the magnitude and assemblage structure of UIBs. The temporal dynamics behind UIB formation are related to the ways that snow and sea-ice conditions impact the under-ice light field. In particular, the onset of snowmelt significantly increased under-ice light availability (>0.1–0.2 mol photons m–2 d–1), marking the concomitant termination of the sea-ice algal bloom and initiation of UIBs. At the pan-Arctic scale, bloom magnitude (expressed as maximum chlorophyll a concentration) was predicted best by winter water Si(OH)4 and PO43– concentrations, as well as Si(OH)4:NO3– and PO43–:NO3– drawdown ratios, but not NO3– concentration. Two main phytoplankton assemblages dominated UIBs (diatoms or Phaeocystis), driven primarily by the winter nitrate:silicate (NO3–:Si(OH)4) ratio and the under-ice light climate. Phaeocystis co-dominated in low Si(OH)4 (i.e., NO3:Si(OH)4 molar ratios >1) waters, while diatoms contributed the bulk of UIB biomass when Si(OH)4 was high (i.e., NO3:Si(OH)4 molar ratios <1). The implications of such differences in UIB composition could have important ramifications for Arctic biogeochemical cycles, and ultimately impact carbon flow to higher trophic levels and the deep ocean.
- Aix-Marseille University France
- Sorbonne University France
- Mediterranean Institute of Oceanography France
- Sorbonne University France
- Stanford University United States
Under-ice phytoplankton blooms, 290, 551, [SDU.STU.OC] Sciences of the Universe [physics]/Earth Sciences/Oceanography, arctic ocean, nutrients, Arctic Ocean, Climate change, GE1-350, under-ice phytoplankton blooms, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, Sea Ice, Nutrients, biogeochemical cycles, Biogeochemical cycles, sea ice, Under-ice phytoplankton blooms; Biogeochemical cycles; Nutrients; Sea Ice; Climate change; Arctic Ocean, Environmental sciences, climate change, [SDE]Environmental Sciences
Under-ice phytoplankton blooms, 290, 551, [SDU.STU.OC] Sciences of the Universe [physics]/Earth Sciences/Oceanography, arctic ocean, nutrients, Arctic Ocean, Climate change, GE1-350, under-ice phytoplankton blooms, [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography, Sea Ice, Nutrients, biogeochemical cycles, Biogeochemical cycles, sea ice, Under-ice phytoplankton blooms; Biogeochemical cycles; Nutrients; Sea Ice; Climate change; Arctic Ocean, Environmental sciences, climate change, [SDE]Environmental Sciences
2 Research products, page 1 of 1
- 2020IsAmongTopNSimilarDocuments
- IsRelatedTo
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).55 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 1% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Top 10% impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 1% visibility views 3 download downloads 2 - 3views2downloads
Data source Views Downloads ZENODO 3 2


