Spatio-temporal distribution, photoreactivity and environmental control of dissolved organic matter in the sea-surface microlayer of the eastern marginal seas of China
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Published:2022-11-18
Issue:22
Volume:19
Page:5251-5268
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Yang Lin, Zhang Jing, Engel AnjaORCID, Yang Gui-PengORCID
Abstract
Abstract. As the boundary interface between the atmosphere and ocean, the sea-surface
microlayer (SML) plays a significant role in the biogeochemical cycles of
dissolved organic matter (DOM) and macronutrients in marine environments. In
our study, the optical properties of DOM were compared between the sub-surface water (SSW) and
the SML during spring, summer and winter in the East China Sea (ECS) and the
Yellow Sea (YS). In addition, photoexposure experiments were designed to
compare photochemical degradation processes of DOM between the SML and the
SSW. Chromophoric DOM (CDOM), fluorescent DOM, dissolved organic carbon,
chlorophyll a (Chl a), picoplankton, nutrients and bacteria were frequently enriched
in the SML. The enrichment factors (EFs) of tryptophan-like component 4 were
significantly higher than other fluorescence components; the longer
wavelength absorption values of CDOM showed higher EFs in the SML, and a
more significant relationship between CDOM and Chl a in the SML, indicating
that autochthonous DOM was more strongly enriched in the SML than the
terrestrial DOM. Higher EFs were generally observed in the SML in the
off-shore regions than in the coastal regions, and CDOM in the SML was
photobleached more after relatively strong irradiation, as also indicated by
the lower percentages of humic-like DOM and lower specific UV absorbance
values (SUVA254) in the SML than the SSW. Compared
to the SSW, the elevated nutrients may stimulate phytoplankton growth,
biological activity and then production of abundant fresh autochthonous DOM
in the SML. Our results revealed a new enrichment model for exploring the
air–sea interface environment, which can explain the more autochthonous
properties of DOM in the SML than the SSW.
Funder
Key Technologies Research and Development Program National Natural Science Foundation of China
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
Reference79 articles.
1. Aller, J. Y., Kuznetsova, M., Jahns, C. J., and Kemp, P. F.: The sea surface
microlayer as a source of viral and bacterial enrichment in marine aerosols,
J. Aerosol Sci., 36, 801–812,
https://doi.org/10.1016/j.jaerosci.2004.10.012, 2005. 2. Bittar, T. B., Vieira, A. A. H., Stubbins, A., and Mopper, K.: Competition
between photochemical and biological degradation of dissolved organic matter
from the cyanobacteria Microcystis aeruginosa, Limnol. Oceanogr., 60,
1172–1194, https://doi.org/10.1002/lno.10090, 2015. 3. Blough, N. V.: Photochemistry in the sea-surface microlayer, in:
The Sea Surface and Global Change, edited by: Liss, P. S. and Duce, R. A., Cambridge University Press, Oxford, UK, 383–424,
https://doi.org/10.1017/CBO9780511525025.014, 1997. 4. Breitburg, D., Levin, L. A., Oschlies, A., Grégoire, M., Chavez, F. P.,
Conley, D. J., Garçon, V., Gilbert, D., Gutiérrez, D., Isensee, K.,
Jacinto, G. S., Limburg, K. E., Montes, I., Naqvi, S. W. A., Pitcher, G. C.,
Rabalais, N. N., Roman, M. R., Rose, K. A., Seibel, B. A., Telszewski, M.,
Yasuhara, M., and Zhang, J.: Declining oxygen in the global ocean and
coastal waters, Science, 5, 359, eaam7240,
https://doi.org/10.1126/science.aam7240, 2018, 5. Brinkmann, T., Sartorius, D., and Frimmel, F. H.: Photobleaching of humic
rich dissolved organic matter, Aquat. Sci., 65, 415–424,
https://doi.org/10.1007/s00027-003-0670-9, 2003.
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