Oceanographic observations in the northern Canadian Arctic Archipelago in August 2024
Description
Data are Conductivity-Temperature-Depth (CTD), Colored Dissolved Organic Matter (CDOM) fluorescence and nitrate profiles collected in August 2024 from the Canadian Coast Guard icebreaker Des Groseilliers in the northern Canadian Arctic Archipelago in Nansen Sound, Greely Fjord and Eureka Sound. Data file is in ASCII format. The CTD observations were carried out with a Sea-Bird Scientific SBE-19plus CTD that was calibrated prior to the expedition and was accurate to ±0.005°C and ±0.0005 S m–1. We used practical salinity calculated directly from the conductivity and temperature of seawater as defined by Practical Salinity Scale 1978. All CTD casts were taken down to 522 m depth or less. CDOM fluorescence for EX/EM = 370/460 nm is from Wet Labs ECO fluorometer. The CDOM sensor sensitivity is 0.09 parts per billion (ppb). Nitrate measurements based on the absorption characteristics of nitrate in the UV light spectrum are from a Sea-Bird Scientific SUNA V2 Optical Nitrate Sensor. The nitrate profiling was accurate to ±2 mmol m–3 (mmol m–3 = millimoles of nitrate per cubic meter of water) or ± 10% of reading according to the manufacturer’s specifications. All profiles were 1-meter binned. CDOM and nitrate profiles were averaged with a 7-meter moving window. Our data, compared with historical observations of 1960s and 1970s, indicate enhancing outflow of cool and less saline Pacific-modified polar water through the northern Canadian Arctic Archipelago. This data set supplements manuscript "Following half-century oceanographic data gap in the northern Canadian Arctic Archipelago: Multidecadal variability of the Pacific water throughflow" by Igor A. Dmitrenko, Sergei A. Kirillov, David G. Babb, Tonya Burgers, Qiang Wang, Sergey Danilov, and Dorthe Dahl-Jensen.
Files
Institutions
Categories
Funding
Canada Excellence Research Chairs