de5f6ecb-6bcf-4d28-9c90-8769870bec96 eng; CAN Polar Data Catalogue Canadian Cryospheric Information Network (519) 888-4567 x32689 200 University Avenue West, University of Waterloo Waterloo Ontario N2L 3G1 Canada pdc@uwaterloo.ca 2022-04-08T13:00:36 North American Profile of ISO 19115:2003 2009-01-01 https://www.polardata.ca/pdcsearch/PDCSearchDOI.jsp?doi_id=12966 Fine-scale time series of surface dimethylsulfide concentrations across ice-covered and ice-free waters of the Canadian Arctic Archipelago in summer, 2017 2018-11-08 Levasseur, Maurice St-Onge, Joanie Lizotte, Martine Massé, Guillaume Tremblay, Jean-Éric Levasseur, M., St-Onge, J., Lizotte, M., Massé, G. and Tremblay, J-E (2018). Fine-scale time series of surface dimethylsulfide concentrations across ice-covered and ice-free waters of the Canadian Arctic Archipelago in summer, 2017. Canadian Cryospheric Information Network (CCIN). Unpublish data. This study presents sea surface concentrations of marine dimethylsulfide (DMS) measured across the Labrador Sea and the Canadian Arctic Archipelago during summer of 2017 (July-August). Using a novel automated instrument (ACT-MIMS) more than 2500 DMS observations were collected at high frequency alongside ancillary measurements of salinity, temperature, fluorescence (chlorophyll a proxy), solar radiation, ice concentration and the algal precursor of DMS, dimethylsulfoniopropionate. DMS concentrations ranged from ca. 1 to 32 nmol L-1 (average of 6 nmol L-1) in 2017 over an area covering a wide range of contrasting marine environments from coastal to open ocean, ice-free waters, as well as under-ice waters. Surface water DMS hotspots were measured in association with thermohaline oceanographic features in high productivity coastal waters, as well as with the presence of ponded first-year ice (FYI). Nighttime increases and daytime decreases of DMS concentrations were also observed in productive areas of the Labrador Sea and Davis Strait continental shelf. The association of DMS concentrations with diurnal solar radiation variation suggests the involvement of photobiological processes. Overall, our results strengthen the view that aqueous DMS cycling in the Arctic is intimately linked with sea ice dynamics and physiological responses to light. As such, future changes in the seasonality of the Arctic cryosphere will likely play an important role in shaping DMS emissions, although the sign and magnitude of the change remain highly uncertain. The objective of this project is to characterize the distribution of oceanic dimethylsulfide (DMS) on a large scale and to link it with the physicochemical and biological parameters of the environment as well as the dynamics of the ice (type, spatial coverage, presence of pond cast iron on the surface). The development of a high-resolution continuous measurement instrument and its deployment aboard the CCGS Amundsen will significantly improve the spatial and temporal resolution of DMS measurements in different contrasting environments (open water, under and around the ice pack, coastal environments) of the Canadian Arctic. Ancillary data for salinity, surface temperature, fluorescence (chlorophyll a proxy), O2 / Ar ratio (net community production proxy) as well as composite images at 360oC contiguous to the vessel and satellite images of the canopy cover ice, will be exploited. Polar Data Catalogue Canadian Cryospheric Information Network (519) 888-4567 x32689 200 University Avenue West, University of Waterloo Waterloo Ontario N2L 3G1 Canada pdc@uwaterloo.ca polardata.ca http https://metadata.arice-h2020.eu/geonetwork/srv/api/records/de5f6ecb-6bcf-4d28-9c90-8769870bec96/attachments/map.png Canadian Arctic Archipelago Chlorophyll Dimethylsulfide (DMS) Nunavut Sea ice Polar Data Catalogue Thesaurus (Canada) 2021-06-02 Canadian Cryospheric Information Network (519) 888-4567 x32689 200 University Avenue West, University of Waterloo Waterloo Ontario N2L 3G1 Canada pdc@uwaterloo.ca polardata.ca http https://www.polardata.ca/pdcinput/public/keywordlibrary Frobisher Bay, Labrador Sea, Davis Strait, Baffin Bay, Lancaster Sound, M'Clintock Channel, Gulf of Boothia, Foxe Basin, Nunavut, Canada – OAUFQ Terms of Use of the Polar Data Catalogue: https://www.polardata.ca/pdcinput/public/termsofuse eng; CAN environment -103.28 -57.71 54 78.21 Time period can be either covered by the content of the dataset or the date when the data has been collected. 2017-07-12 2017-08-16 Summary: Not Applicable Research Program(s): ArcticNet,Other. For further information: Maurice.Levasseur@bio.ulaval.ca, joaniestonge2@gmail.com false Digital file 1.0 Polar Data Catalogue Canadian Cryospheric Information Network (519) 888-4567 x32689 200 University Avenue West, University of Waterloo Waterloo Ontario N2L 3G1 Canada pdc@uwaterloo.ca This metadata was generated from the PDC metadata database at 2021-06-02 Polar Data Catalogue Canadian Cryospheric Information Network (519) 888-4567 x32689 200 University Avenue West, University of Waterloo Waterloo Ontario N2L 3G1 Canada pdc@uwaterloo.ca