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Spatial Distribution and Biogeochemical Cycling of Dimethylated Sulfur Compounds and Methane in the East China Sea During Spring
Author(s) -
Zhai Xing,
Li JianLong,
Zhang HongHai,
Tan DanDan,
Yang GuiPeng
Publication year - 2019
Publication title -
journal of geophysical research: oceans
Language(s) - English
Resource type - Journals
eISSN - 2169-9291
pISSN - 2169-9275
DOI - 10.1029/2018jc014488
Subject(s) - dimethylsulfoniopropionate , biogeochemical cycle , sulfur , dimethyl sulfide , particulates , environmental chemistry , seawater , methane , oceanography , environmental science , cycling , sulfur cycle , chemistry , geology , nutrient , geography , organic chemistry , phytoplankton , archaeology
The spatial distributions of dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP), dimethylsulfoxide (DMSO), and methane (CH 4 ) were studied in the East China Sea during May 2017, and the possible controlling factors and biogeochemical cycling processes are discussed. The mean surface concentrations of DMS and CH 4 were 10.66 and 9.93 nmol/L in the coastal area and 7.60 and 6.88 nmol/L in the open ocean, respectively. Horizontal and vertical profiles of the dimethylated sulfur compounds and CH 4 were largely affected by different water masses, with enhancement observed in the coastal area. Significant correlations were found between CH 4 and particulate DMSP ( r = 0.609, p < 0.01, n = 42), and between CH 4 and dissolved DMSO ( r = 0.654, p < 0.01, n = 42). A dissolved DMSP (DMSP d ) spike experiment revealed that the bacterial communities had potential to utilize DMSP d , meanwhile producing CH 4 under oligotrophic conditions. The average mixing ratio of atmospheric DMS was 109 ± 49 pptv. Variations of marine DMS and wind speed explained 23 and 40% of the variation in the mixing ratios of atmospheric DMS, respectively. The sea‐to‐air fluxes of DMS and CH 4 were estimated to be 18.64 ± 14.92 and 13.85 ± 15.03 μmol m −2 d −1 , respectively.