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Issue 10, 2019
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Unexpectedly high dimethyl sulfide concentration in high-latitude Arctic sea ice melt ponds

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Abstract

Dimethyl sulfide (DMS) production in the northern Arctic Ocean has been considered to be minimal because of high sea ice concentration and extremely low productivity. However, we found DMS concentration (1–33 nM) in melt ponds on sea ice at a very high latitude (78°N) in the central Arctic Ocean to be up to ten times that in the adjacent open ocean (<3 nM). We divided melt ponds into three categories: freshwater melt ponds, brackish melt ponds, and open saline melt ponds. Melt ponds from each category had different formation mechanisms and associated DMS contents. Closed brackish ponds (salinity of >20) had particularly high DMS concentration. Water in brackish ponds was mixed with open ocean water in the past via a hole at the bottom of the floe that kept the pond open to the ocean; therefore, unlike freshwater melt ponds, brackish ponds became sites of DMS accumulation. Our results suggest that continuous increase in melt pond coverage on Arctic sea ice could considerably impact future Arctic climate as well as enhancing DMS concentration in the Arctic atmosphere.

Graphical abstract: Unexpectedly high dimethyl sulfide concentration in high-latitude Arctic sea ice melt ponds

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Submitted
25 Apr 2019
Accepted
13 Aug 2019
First published
13 Aug 2019

Environ. Sci.: Processes Impacts, 2019,21, 1642-1649
Article type
Communication

Unexpectedly high dimethyl sulfide concentration in high-latitude Arctic sea ice melt ponds

K. Park, I. Kim, J. Choi, Y. Lee, J. Jung, S. Ha, J. Kim and M. Zhang, Environ. Sci.: Processes Impacts, 2019, 21, 1642
DOI: 10.1039/C9EM00195F

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