DOI: 10.1002/gbc.20047
Scopus记录号: 2-s2.0-84879587896
论文题名: Diel patterns of oceanic dimethylsulfide (DMS) cycling: Microbial and physical drivers
作者: Galí M ; , Simó R ; , Vila-Costa M ; , Ruiz-González C ; , Gasol J ; M ; , Matrai P
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 3 起始页码: 620
结束页码: 636
语种: 英语
英文关键词: diel cycles
; dimethyl sulfide
; dimethylsulfoniopropionate
; microbial activity
; solar radiation
Scopus关键词: Bacterial production
; Climatic effects
; Diel cycles
; Dimethyl sulfide
; Dimethylsulfoniopropionate
; Marine emissions
; Microbial activities
; Temporal dynamics
; Solar radiation
; Sun
; Experiments
; climate effect
; concentration (composition)
; dimethylsulfide
; dimethylsulfoniopropionate
; microbial activity
; numerical model
; solar radiation
; Atlantic Ocean
; Mediterranean Sea
; Sargasso Sea
; Bacteria (microorganisms)
英文摘要: Dimethylsulfide (DMS) is a biogenic gas with potential climatic effects, and its marine emission depends on the interplay between microbial activity and physical forcing in the oceanic upper mixed layer. We investigated the diel cycling patterns of DMS and its precursor dimethylsulfoniopropionate (DMSP) in four experiments (28 to 48 h long) performed in mesotrophic to ultraoligotrophic Mediterranean and Sargasso Sea waters. Samples taken every 4 or 6 h were analyzed for dimethylated sulfur pools and incubated to measure DMS and DMSP cycling rates, as well as primary and bacterial production. In all four experiments, DMS budgets showed pronounced day versus night variability. In the three summer experiments, gross community DMS production (GPDMS) increased by twofold to threefold from nighttime to daytime, peaking 0-4 h after solar noon. This excess GPDMS was balanced by higher photochemical and microbial sinks during the day, effectively buffering DMS concentrations. In the only winter experiment, GPDMS exhibited opposed temporal dynamics and peaked at nighttime in parallel to total DMSP consumption. Community DMSP to DMS conversion yields were generally <10% throughout the winter experiment and at night in summer, and increased to >15% (even >50%) during the day in summer, presumably due to phytoplankton radiative stress. Our data suggest that (1) diel variability should be taken into account in process studies, diagnostic, and prognostic models of DMS cycling and (2) the community DMS yield is a key variable that defines characteristic DMS cycling regimes. ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77637
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Marine Biology and Oceanography, Institut de Ciències Del Mar, CSIC, Pg. Marítim de la Barceloneta 37-49, ES-08003 Barcelona, Catalonia, Spain; Department of Continental Ecology-Limnology, Centre d'Estudis Avançats de Blanes, CSIC, Blanes, Spain; Bigelow Laboratory for Ocean Sciences, W. Boothbay Harbor, ME, United States
Recommended Citation:
Galí M,, Simó R,, Vila-Costa M,et al. Diel patterns of oceanic dimethylsulfide (DMS) cycling: Microbial and physical drivers[J]. Global Biogeochemical Cycles,2013-01-01,27(3)