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. (2020). An update on Inuit perceptions of their changing environment, Qikiqtaaluk (Baffin Island, Nunavut) (Vol. 8).
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. (2020). Stress factors resulting from the Arctic vernal sea-ice melt: Impact on the viability of bacterial communities associated with sympagic algae (Vol. 8).
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. (2020). Reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in Baffin Bay, Canadian Arctic (Vol. 8).
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. (2019). The co-distribution of Arctic cod and its seabird predators across the marginal ice zone in Baffin Bay (Vol. 7).
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. (2019). The evolution of light and vertical mixing across a phytoplankton ice-edge bloom (Vol. 7).
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L. C. Matthes, J. K. Ehn, S. L.-Girard, N. M. Pogorzelec, M. Babin, C. J. Mundy. (2019). Average cosine coefficient and spectral distribution of the light field under sea ice: Implications for primary production (Vol. 7).
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Margaux Gourdal, Odile Crabeck, Martine Lizotte, Virginie Galindo, Michel Gosselin, Marcel Babin, Michael Scarratt, Maurice Levasseur. (2019). Upward transport of bottom-ice dimethyl sulfide during advanced melting of arctic first-year sea ice (Vol. 7).
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. (2019). Environmental factors influencing the seasonal dynamics of spring algal blooms in and beneath sea ice in western Baffin Bay (Vol. 7).
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. (2019). Temporal evolution of IP25 and other highly branched isoprenoid lipids in sea ice and the underlying water column during an Arctic melting season (Vol. 7).
Abstract: In recent years, certain mono- and di-unsaturated highly branched isoprenoid (HBI) alkene biomarkers (i.e., IP25 and HBI IIa) have emerged as useful proxies for sea ice in the Arctic and Antarctic, respectively. Despite the relatively large number of sea ice reconstructions based on IP25 and HBI IIa, considerably fewer studies have addressed HBI variability in sea ice or in the underlying water column during a spring bloom and ice melt season. In this study, we quantified IP25 and various other HBIs at high temporal and vertical resolution in sea ice and the underlying water column (suspended and sinking particulate organic matter) during a spring bloom/ice melt event in Baffin Bay (Canadian Arctic) as part of the Green Edge project. The IP25 data are largely consistent with those reported from some previous studies, but also highlight: (i) the short-term variability in its production in sea ice; (ii) the release of ice algae with high sinking rates following a switch in sea ice conditions from hyper- to hyposaline within the study period; and (iii) the occurrence of an under-ice phytoplankton bloom. Outcomes from change-point analysis conducted on chlorophyll a and IP25, together with estimates of the percentage of ice algal organic carbon in the water column, also support some previous investigations. The co-occurrence of other di- and tri-unsaturated HBIs (including the pelagic biomarker HBI III) in sea ice are likely to have originated from the diatom Berkeleya rutilans and/or the Pleurosigma and Rhizosolenia genera, residing either within the sea ice matrix or on its underside. Although a possible sea ice source for HBIs such as HBI III may also impact the use of such HBIs as pelagic counterparts to IP25 in the phytoplankton marker-IP25 index, we suggest that the impact is likely to be small based on HBI distribution data.
Programme: 1164
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. (2019). Late spring bloom development of pelagic diatoms in Baffin Bay (Vol. 7).
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