Kolyma river and near shore CTD measurements throughout the open water season using a HYDROLAB HL7 multiparameter probe, summer 2019.

The aim of the CACOON project is to quantify the effect of changing freshwater export and terrestrial permafrost thaw on the type and fate of river-borne organic matter delivered to Arctic coastal waters, and resultant changes on ecosystem functioning in the coastal Arctic Ocean (https://www.changing-arctic-ocean.ac.uk/project/cacoon/). To capture the spatial and temporal variability, CTD data were collected in the lower Kolyma river in 2019 during the open water season between June 7th and September 2nd using small motorboats. CTD measurements were collected using a HYDROLAB HL7 multiparameter probe with a Hydrolab Surveyor HL Handheld unit. The following parameters were collected: specific conductivity, turbidity, barometric pressure, dissolved oxygen, depth, water temperature, salinity and chlorophyll-a. Additional information regarding the multiparameter probe, see manufacturer homepage (https://www.ott.com/products/water-quality-2/hydrolab-hl7-multiparameter-sonde-2338/). This dataset is part of a publication by: Fuchs et al., 2021; High-resolution bathymetry models for the Kolyma and Lena delta near-shore regions, ESSD. Additional information and project overview is published: CACOON Ice spring campaign, Reports on Polar and Marine Research, 749, 2021. Two additional datasets belonging to the same project are available: 1. CTD data from the Lena Delta region in combination with two bathymetrical maps for the Lena near-shore and Kolyma Gulf are available on the PANGAEA Data Publisher (www.pangaea.de). 2. CTD cast data from the Lena Delta at the BODC entitled: Lena river delta and near shore CTD short time logs under ice using a HYDROLAB HL7 multiparameter probe, spring 2019 (doi:10.5285/c0f9eff8-0efa-1044-e053-6c86abc0ce9f).