The Effect of Carbonate Chemistry on Sea Ice Biota in the High Arctic 2018
The High Arctic is a highly variable system whose biota consists of both that within the water column and that associated with ice. During some years the North Pole region is largely ice free, and in other years experiences heavy concentrations of ice of up to 2 meters (m) in thickness. We participa...
| Main Authors: | , |
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| Format: | Dataset |
| Language: | English |
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NSF Arctic Data Center
2018
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| Online Access: | https://dx.doi.org/10.18739/a2bg2hb5z https://arcticdata.io/catalog/view/doi:10.18739/A2BG2HB5Z |
| Summary: | The High Arctic is a highly variable system whose biota consists of both that within the water column and that associated with ice. During some years the North Pole region is largely ice free, and in other years experiences heavy concentrations of ice of up to 2 meters (m) in thickness. We participated in the Research Vessel/Ice Breaker (RVIB) Oden cruise to the North Pole in late summer, 2018, with the objective to sample High Arctic sea ice biota and the carbonate chemistry of sea ice. Ice concentrations were extremely heavy during this year, and the programs objectives were met by mooring to a large ice floe and establishing a temporary ice camp to collect ice and atmospheric information. Our sampling included samples from that floe, but also from other areas that were reached using a helicopter. Ice cores were sampled following established best practices (Miller et al., 2015) using a 0.9 m Kovacs ice corer driven by a small electric drill. Cores were removed from the corer, and temperatures were taken using a Amadigit thermistor. All cores were then cut using a stainless-steel saw into 10 centimeter (cm) sections. For carbonate chemistry, each section was placed into a gas-impermeable Tedlar® bag, sealed, and the surrounding air removed through a valve using a manual pump. Independent cores were collected for biological properties and processed in a similar manner. Ice samples were thawed in the dark from 4-10⁰ Celsius (C) for approximately 24 hours before analysis. In the ships laboratories, samples were analyzed for Dissolved Inorganic Carbon (DIC) by an Automated Infrared Inorganic Carbon Analyzer (AIRICA; Marianda) system equipped with a LI-COR LI7000 detector and for Total Alkalinity (TA) by an automatic open-cell potentiometric titration with 0.1 Molar (M) hydrochloric acid using a Metrohm Titrando system (Dickson et al., 2007). Samples for chlorophyll and particulate organic matter were filtered through 25 millimeter (mm) GF/F filters; chlorophyll was analyzed by fluorometry, and Particulate Organic Carbon/Particulate Organic Nitrogen (POC/PON) samples were dried at 60ºC and returned to VIMS for analysis on a Costech elemental analyzer. Additional cores were collected for experimental analysis in a ships cold room, where the carbonate chemistry was altered by immersing core sections in seawater with enhanced DIC levels. All experiments were conducted using Tedlar bags to eliminate atmospheric exchanges of gases. Samples were processed at the end of 7 days as above. Results have been reported in Torstensson et al. (in press). |
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