Data for contribution of marine phytoplankton and bacteria to ocean alkalinity ...

• Main Authors: Lee, Kitack, Lee, Chang-Ho
• Format: Dataset
• Language: English
• Published: Dryad 2021
• Subjects: Arctic; Arctic Ocean; Bering Sea; Chukchi Sea; Pacific; Chukchi; Phytoplankton
• Online Access: https://dx.doi.org/10.5061/dryad.fbg79cnvp; https://datadryad.org/stash/dataset/doi:10.5061/dryad.fbg79cnvp

The contributions of phytoplankton and bacteria cells to alkalinity (AT) were measured in seawater samples obtained from 205 locations including the East Sea, the North Pacific Ocean, the Bering Sea, the Chukchi Sea, and the Arctic Ocean. We attributed the differences in AT values measured for unfiltered versus filtered samples to AT components contributed by phytoplankton (retained on a 0.7 µm filter) and by phytoplankton and bacteria combined (AT-BIO; retained on a 0.45 µm filter). The AT-BIO values reached 10-19 μmol kg-1 in the East Sea and the North Pacific Ocean, and progressively decreased to a level of 1 μmol kg-1 with distance towards the Arctic Ocean. The study shows that the AT-BIO values are non-negligible in coastal and open ocean environments and need to be considered when assessing the accuracy of carbon parameters calculated using the thermodynamic models that use measured AT as an input parameter. ... : Sampling locations Sampling was carried out on board the R/V ARAON during the study from 17 July 2020 to 15 September 2020. The sampling locations were approximately evenly spaced along a transect from the East Sea to the North Pacific Ocean, the Bering Sea, the Chukchi Sea, and the Arctic Ocean. A total of 205 surface seawater samples were collected in 4-L polycarbonate bottles from the underway clean seawater line. To obtain depth profiles, a total 24 discrete samples were collected in 1-L high density polyethylene bottles using a rosette sampler (SeaBird Electronics, SBE 911 plus) at two sites (76.003ºN, 170.588ºW; 74.499ºN, 162.262ºW) in the Arctic Ocean. Determination of AT, AT-BIO, AT-PLANKTON, and AT-BACTERIA For each seawater sample the AT values of an unfiltered and a filtered (0.7 μm and 0.45 μm) sample were measured within 12 h of collection. The total contribution of all biogenic particles to the AT of the unfiltered seawater (AT-BIO; Equation 2) was determined as the difference between the ...