Oceanographic observations (CTD and DOM fluorescence) in the Nansen Sound fiord system of the eastern Canadian Arctic Archipelago in May 2025

This data set supplements manuscript "Temperature quenching of DOM fluorescence sensor: spatial variability of the temperature response in the ice-covered fjords of the Northern Canadian Arctic Archipelago Eddies in ice-covered fjords of the northern Canadian Arctic Archipelago" by Igor A. Dmitrenko, Colin A. Stedmon, David Capelle, Tonya Burgers, Sergei A. Kirillov, Rachel Mandryk, David G. Babb, Jens Ehn, and Dorthe Dahl-Jensen submitted to Journal of Geophysical Research: Oceans. Using in situ observations in the Nansen Sound fiord system, we assessed the temperature quenching of DOM fluorescence subtracting a linear relationship with temperature for the Atlantic-derived water layer, where the terrestrial and Pacific-derived DOM fractions are weak or absent. After correcting for temperature quenching, DOM fluorescence has been used as an effective proxy for identifying water dynamics in the landfast ice-covered fjords of the Nansen Sound fiord system.
Data file is in ASCII format.
The data set consists of 49 CTD (conductivity-temperature-depth) and FCDOM (fluorescence of colored dissolved organic matter) profiles taken in the Nansen Sound fiord system between 7 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. FCDOM vertical profiles were averaged with a 7-m moving window. CTD profiles were 1-meter binned.