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海水中主要含硫化合物β-二甲基巯基丙酸内盐(DMSP)降解可产生丙烯酸(AA)和活性气体二甲基硫(DMS)。2011年8月对黄海冷水团海域的AA及相关参量的分布特征进行了研究。结果表明,该海域表层海水中AA的浓度为0~0.208μmol/L,平均值为(0.081±0.075)μmol/L。AA的高值区出现在海域的东南部,可能是受到长江冲淡水的影响。AA的浓度总体上呈现出由南到北递增的趋势,与Chl-a较为一致,表明该海域的AA主要是由DMSP裂解产生的。表层海水中AA与温度表现出明显的负相关性。AA的垂直分布表现为:中层>底层>表层,这可能是产生AA的浮游植物与消耗AA的细菌共同作用的结果。海域中AA浓度与DMSP或DMS无明显的相关性。AA浓度远高于DMS,AA/DMS平均为106∶1,初步估算出DMSP降解产生的AA约为66.5%。AA/Chl-a平均为126.6 mmol/g,比DMSP/Chl-a高1个数量级,比DMS/Chl-a高2个数量级。
Degradation of beta-dimethyl mercaptopropionate (DMSP), a major sulfur-containing compound in seawater, produces acrylic acid (AA) and an active gas, dimethyl sulfide (DMS). In August 2011, the distribution characteristics of AA and related parameters in the Yellow Sea cold water area were studied. The results showed that the concentration of AA in surface seawater of this area was 0 ~ 0.208μmol / L with an average of (0.081 ± 0.075) μmol / L. The high value area of AA appears in the southeastern part of the sea, possibly affected by the Yangtze River’s freshwater. The concentration of AA generally showed an increasing trend from south to north, which was consistent with Chl-a, indicating that the AA in the sea was mainly produced by DMSP cleavage. Surface water AA and temperature showed a significant negative correlation. The vertical distribution of AA showed as follows: middle layer> bottom> surface layer, which may be the result of the interaction between AA-producing phytoplankton and AA-consuming bacteria. There was no significant correlation between concentration of AA in sea area and DMSP or DMS. The concentration of AA was much higher than that of DMS. The average AA / DMS ratio was 106: 1. It was estimated that the AA produced by DMSP degradation was about 66.5%. AA / Chl-a averaged 126.6 mmol / g, one order of magnitude higher than DMSP / Chl-a and two orders of magnitude higher than DMS / Chl-a.