Abstract
Abstract. The MALINA oceanographic campaign was conducted during summer 2009 to investigate the carbon stocks and the processes controlling the carbon fluxes in the Mackenzie River estuary and the Beaufort Sea. During the campaign, an extensive suite of physical, chemical and biological variables were measured across seven shelf–basin transects (south–north) to capture the meridional gradient between the estuary and the open ocean. Key variables such as temperature, absolute salinity, radiance, irradiance, nutrient concentrations, chlorophyll a concentration, bacteria, phytoplankton and zooplankton abundance and taxonomy, and carbon stocks and fluxes were routinely measured onboard the Canadian research icebreaker CCGS Amundsen and from a barge in shallow coastal areas or for sampling within broken ice fields. Here, we present the results of a joint effort to compile and standardize the collected data sets that will facilitate their reuse in further studies of the changing Arctic Ocean. The data set is available at https://doi.org/10.17882/75345 (Massicotte et al., 2020).
Highlights
The Mackenzie River is the largest source of terrestrial particles entering the Arctic Ocean
JE was the logistic coordinator for the cruise and was responsible for Inherent optical property (IOP) measurements from the CTD rosette and contributed to SPM, particulate organic carbon (POC) and particulate absorption measurements and processing
DV and DM participated in the MALINA cruise and sampled for flow cytometry, DNA and cultures
Summary
The Mackenzie River is the largest source of terrestrial particles entering the Arctic Ocean (see Doxaran et al, 2015, and references therein). The possible increase in nutrients brought by Arctic rivers may contribute to higher autotrophic production and sequestration of organic carbon (Tremblay et al, 2014). Detailed studies about these processes are needed to determine if the Arctic Ocean will become a biological source or a sink of atmospheric CO2.
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