Oceanographic observations (CTD, CDOM fluorescence, nitrates, and currents) in Nansen and Eureka Sounds, Greely Fiord, and Antoinette Bay of the eastern Canadian Arctic Archipelago in May and September 2025
Description
This data set supplements manuscript "Eddies in ice-covered fjords of the northern Canadian Arctic Archipelago" by Igor A. Dmitrenko, Sergei A. Kirillov, Paul G. Myers, David Capelle, David G. Babb, Clark Pennelly, Lisa C. Matthes, and Dorthe Dahl-Jensen submitted to Journal of Geophysical Research: Oceans. We present observations of cyclonic passing and standing eddies beneath landfast ice in the Nansen Sound fiord system. Baroclinic eddies of a double-concave or negative lens shape were observed below the ice in 2025. The transformation of a cyclonic standing eddy of a negative lens shape into a typical surface-intensified eddy was observed from the ice-covered winter to the ice-free summer 2025. Data files are in ASCII format. Oceanographic survey data: 1. 23 CTD (conductivity-temperature-depth), FCDOM (fluorescence of colored dissolved organic matter), and nitrate profiles taken in the Nansen Sound fiord system between 3 and 25 May 2025 using snowmobiles and a Twin Otter aircraft operated on skis. Observations were carried out with a RBRconcerto3 CTD outfitted with a Seapoint FCDOM sensor for EX/EM = 370/460 nm and a Sea-Bird Scientific SUNA V2 optical nitrate sensor. FCDOM and nitrate vertical profiles were averaged with a 7-m moving window. CTD data was 1-meter binned. 2. 6 CTD profiles collected from the CCGS Amundsen in September 2025 over the junction of Nansen and Eureka Sounds and Greely and Hare Fiords using a Sea-Bird 9plus CTD. 3. Velocity data from the CCGS Amundsen vessel-mounted ADCP obtained over the junction of Nansen and Eureka Sounds and Greely and Hare Fiords in September 2025. A hull-mounted ADCP is Teledyne RD Ocean Surveyor 150 kHz. Mooring data: The landfast ice-tethered mooring was deployed in Eureka Sound at 80.015608°N, 86.645053°W from November 2024 to May 2025. The mooring setup consisted of two Teledyne RD Workhorse 300 kHz Acoustic Doppler current profilers (ADCPs) placed at 105 m (up‐looking) and at 107 m (down‐looking), and an Ice Tethered Profiler (ITP) by McLane Research Laboratory preprogramed to cast every 12 hr (up- and downward) in the depth range from 6 to 339 m. Only two portions of the ITP CTD and ADCP record from 8–13 February and 1–6 April 2025 are presented. The ITP was equipped with a CTD sensor 41CP and a dissolved oxygen (DO) sensor SBE-43. Only zonal currents presented. Files: 1. ITP CTD and DO data.CSV: ITP CTD and dissolved oxygen profiles for 8–13 February and 1–7 April 2025; 2. Moored ADCPs zonal current.CSV: Moored ADCP zonal current profiles for 8–13 February and 1–7 April 2025; 3. CTD CDOM Nitr data May and September 2025.CSV: CTD, CDOM fluorescence, and nitrate vertical profiles for oceanographic surveys in May and September 2025; 4. Amundsen ADCP profiles.CSV: Velocity data from the CCGS Amundsen vessel-mounted ADCP obtained over the junction of Nansen and Eureka Sounds and Greely and Hare Fiords in 11 and 16 September 2025.
Files
Institutions
- University of ManitobaManitoba, Winnipeg