High-resolution, mixed layer NCP estimates and ancillary data from the Central and Eastern North American Arctic: 2015, 2018, 2019

• Main Authors: Izett, Robert, Tortell, Philippe
• Format: Dataset
• Language: unknown
• Published: 2021
• Subjects: Arctic; Hudson Bay; Baffin Bay; Canadian Arctic Archipelago; Hudson; Hudson Strait; Myers; Waterman; Arctic Archipelago; Baffin; Labrador Sea; Sea ice; Subarctic
• Online Access: https://zenodo.org/record/5593382; https://doi.org/10.5281/zenodo.5593382

This dataset contains compiled ship-based, high-resolution (underway) estimates of mixed layer net community production (NCP) from three summertime cruises in the Central and Eastern North American Arctic in 2015, 2018 and 2019. NCP estimates were derived from underway O2/Ar observations, obtained using ship-based membrane inlet mass spectrometry. Ancillary data - including geographic information for the underway measurements (time, location) - are also provided. Data are provided in NetCDF and Matlab (.mat) format. This dataset is a supplement to the following publication: Izett, R. W., Castro de la Guardia, L., Chanona, M., Myers, P. G., Waterman, S., and Tortell, P. D. Impact of vertical mixing on summertime net community production in Canadian Arctic and Subarctic waters: Insights from in situ measurements and numerical simulations. Publication abstract: We present ΔO2/Ar-based estimates of mixed layer net community production (NCP) from three summer cruises in the central and eastern North American Arctic and Subarctic oceans. Coupling shipboard underway and discrete observations with output from an ocean circulation model, we correct the NCP estimates for vertical mixing contributions to the surface O2 budget. Large positive corrections were derived in regions of strong wind-driven mixing, such as the Labrador Sea, and the physically-dynamic Canadian Arctic Archipelago. In contrast, corrections were small in the density-stratified Baffin Bay, where vertical mixing was low, and in the well-mixed Hudson Strait, where vertical O2 gradients were weak. We observed a heterogeneous distribution of corrected NCP across the study region, reflecting varying contributions of nutrient supply, freshwater input and sea ice dynamics. Elevated NCP was apparent in the Labrador Sea, Hudson Strait, and nearshore regions influenced by glacial meltwater and recent ice retreat. Low NCP and localized net heterotrophy were observed in Baffin Bay, and near strong freshwater and organic matter sources in Hudson Bay and the Queen ...