Ice Covered Ecosystems - CAMbridge bay Process Studies (ICE-CAMPS)

Sea ice algae are an important contributor of primary production in the Arctic ecosystem. Within the bottom-ice environment, access to nutrients from the underlying ocean is a major factor controlling production, phenology, and taxonomic composition of ice algae. Previous studies have demonstrated that tides and currents play an important role in driving the flux of nutrients to bottom-ice algal communities when biological demand during the spring bloom is high. In this study we investigate how surface currents under land-fast, first-year ice influence nutrient supply based on stoichiometric composition, algal chlorophyll a biomass, and species composition during spring 2016, in Dease Strait, Nunavut. Stronger water dynamics over a shoaled and constricted strait dominated by tidal currents (tidal strait) supported turbulent flow more than 85% of the deployment duration in comparison to outside the tidal strait in an embayment where turbulent flow was only evidenced a small percentage (< 15%) of the time. The system appeared to be nitrate-depleted with surface water concentrations averaging 1.3 mol L–1. Increased currents were correlated significantly with a decrease in ice thickness and an increase in ice algal chlorophyll a. Furthermore, pennate diatoms dominated the ice algal community abundance with greater contribution within the strait where currents were greatest. These observations all support the existence of a greater nutrient flux to the ice bottom where currents increased towards the center of the tidal strait, resulting in an increase of bottom ice chlorophyll a biomass by 5–7 times relative to that outside of the strait. Therefore, expanding beyond the long identified biological hotspots of open water polynyas, this paper presents the argument for newly identified hotspots in regions of strong sub-ice currents but persistent ice covers, so called “invisible polynyas”.

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Related Collections and Datasets


Field Value
Title Ice Covered Ecosystems - CAMbridge Bay Process Studies
Research Program Name ICE-CAMPS
Keyword Vocabulary Polor Data Catalogue
Keyword Vocabulary URL
Theme Cryosphere
Status Complete
Project DOI 10.5203/pb1d-a512
Metadata Creation Date 2022
Publisher CanWIN
Related Facilities Centre for Earth Observation Science
University of Manitoba
Field Value
Project extent
Project Area Dease Straight, Nunavut
Spatial regions Cambridge Bay
Spatial extent West Bound Longitude
Spatial extent East Bound Longitude
Spatial extent South Bound Latitude
Spatial extent North Bound Latitude
Temporal extent
Project Start Date 2016-05-06
Project End Date
Field Value
Project Contributors
Principal Investigators
Principal Investigators 1
Principal Investigator Name
Mundy, C.J
Type of Name
Principal Investigator Email
Principal Investigator Affiliation
Centre for Earth Observation Science - University of Manitoba
Principal Investigator ORCID ID
Project Data Curator Mundy, C.J
Project Data Curator email
Project Data Curator Affiliation Centre for Earth Observation Science - University of Manitoba
Funder Information
Field Value
License Name Creative Commons Attribution-ShareAlike 4.0 International
Licence Schema Name SPDX
Licence URL
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