nerc.ac.uk

Dissolved organic carbon and nitrogen cycling along the west Antarctic Peninsula during summer

Dittrich, R.; Henley, S.F.; Ducklow, H.W.; Meredith, M.P. ORCID: https://orcid.org/0000-0002-7342-7756. 2022 Dissolved organic carbon and nitrogen cycling along the west Antarctic Peninsula during summer. Progress in Oceanography, 206, 102854. 14, pp. 10.1016/j.pocean.2022.102854

Before downloading, please read NORA policies.
[thumbnail of Open Access]
Preview
Text (Open Access)
© 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
1-s2.0-S0079661122001136-main.pdf - Published Version
Available under License Creative Commons Attribution 4.0.

Download (7MB) | Preview

Abstract/Summary

The cycling of dissolved organic matter in the productive west Antarctic Peninsula (WAP) region is not well understood. For this study, dissolved organic carbon (DOC) and nitrogen (DON) concentrations and other biogeochemical measurements were collected along the WAP shelf during austral summer 2017. Concentrations of both DOC and DON in the upper ocean were lower than in lower latitudes (38.13–48.00 μmol C L−1, 2.90–10.52 μmol N L−1). DOC is produced along with particulate organic carbon during primary production, and is subsequently consumed by bacteria. DON shows high variability and is more likely the product of bacterial activity only in the surface waters. The N-isotopic composition of nitrate and particulate nitrogen showed intense nitrification, especially along the coast, and supports the findings of intense upper ocean cycling of organic matter of both particulate and dissolved forms. Export of DOM from the productive surface layer was negligible in the shelf waters of the WAP. Samples from glacial melt areas showed increased DON concentrations (7.88–10.52 μmol N L−1) so we conclude that increasing warming and continuing melting of Antarctic glaciers may lead to higher concentrations of dissolved organic matter but also higher bacterial activity with more intense upper-ocean carbon and nitrogen cycling.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.pocean.2022.102854
ISSN: 0079-6611
Additional Keywords: Nitrogen cycling, Biogeochemistry, West Antarctic Peninsula, Stable isotopes, Dissolved organic matter, Sea ice
Date made live: 29 Jul 2022 10:07 +0 (UTC)
URI: https://nora.nerc.ac.uk/id/eprint/532995

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...