In:
Biogeosciences, Copernicus GmbH, Vol. 19, No. 20 ( 2022-10-28), p. 5021-5040
Abstract:
Abstract. Climate-relevant trace gas air–sea exchange exerts an
important control on air quality and climate, especially in remote regions
of the planet such as the Southern Ocean. It is clear that polar regions
exhibit seasonal trends in productivity and biogeochemical cycling, but
almost all of the measurements there are skewed to summer months. If we want
to understand how the Southern Ocean affects the balance of climate through
trace gas air–sea exchange, it is essential to expand our measurement
database over greater temporal and spatial scales, including all seasons.
Therefore, in this study, we report measured concentrations of
dimethylsulfide (DMS, as well as related sulfur compounds) and isoprene in the
Atlantic sector of the Southern Ocean during the winter to understand the
spatial and temporal distribution in comparison to current knowledge and
climatological calculations for the Southern Ocean. The observations of
isoprene are the first in the winter season in the Southern Ocean. We found
that the concentrations of DMS from the surface seawater and air in the
investigated area were 1.03 ± 0.98 nmol−1 and 28.80 ± 12.49 pptv, respectively. The concentrations of isoprene in surface seawater were
14.46 ± 12.23 pmol−1. DMS and isoprene fluxes were 4.04 ± 4.12 µmol m−2 d−1 and 80.55 ± 78.57 nmol m−2 d−1, respectively. These results are generally lower than the values
presented or calculated in currently used climatologies and models. More
data are urgently needed to better interpolate climatological values and
validate process-oriented models, as well as to explore how finer
measurement resolution, both spatially and temporally, can influence air–sea
flux calculations.
Type of Medium:
Online Resource
ISSN:
1726-4189
DOI:
10.5194/bg-19-5021-2022
DOI:
10.5194/bg-19-5021-2022-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2022
detail.hit.zdb_id:
2158181-2
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