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为深入研究我国近海异戊二烯的生物地球化学过程及气候效应,于2013年11月6—23日(秋季)在黄海、渤海海域设25个采样点采集海水样品,其中在A断面4个采样点采集不同深度海水样品,运用吹扫捕集-气质联用法对海水中c(异戊二烯)进行分析,研究其分布规律及影响因素,并对异戊二烯的海-气通量进行了探讨.结果表明:1表层海水中c(异戊二烯)的范围为10.76~48.67 pmol/L,平均值为(22.85±10.52)pmol/L,其水平分布呈北高南低的特征;2c(异戊二烯)与ρ(Chla)(Chla为叶绿素a)呈正相关(R=0.643 4,n=25,P<0.000 4),说明浮游植物生物量是影响研究海域内c(异戊二烯)水平分布与变化规律的重要因素;3调查期间c(异戊二烯)在A断面上的垂直分布较为均匀且没有出现明显分层现象;4表层海水中异戊二烯处于过饱和状态,其海-气释放通量范围为6.26~449.81 nmol/(m2·d),平均值为(91.62±109.75)nmol/(m2·d).研究显示,我国陆架海区可能是全球海洋、大气异戊二烯重要的源,相关的调查研究工作亟需展开.
In order to further study the biogeochemical processes and climate effects of offshore isoprene in China, seawater samples were collected from 25 sampling sites in the Yellow Sea and Bohai Sea from November 6 to November 23, 2013 (Autumn), of which 4 Samples of seawater samples of different depths were taken at the sampling points. The c (isoprene) in seawater was analyzed by the method of purge and trap - GC-MS, and the distribution and influencing factors were studied. The sea-air flux of isoprene The results showed that: (1) c (isoprene) in surface seawater ranged from 10.76 to 48.67 pmol / L with an average of (22.85 ± 10.52) pmol / L, (R = 0.643 4, n = 25, P <0.000 4), indicating that the phytoplankton biomass is the major factor influencing c (isoenzyme Butadiene and pentadiene; 3 the vertical distribution of c (isoprene) in section A was more uniform and no obvious delamination occurred during the survey period; 4 the isoprene in surface seawater was in In the saturated state, the flux of sea-air release was 6.26 ~ 449.81 nmol / (m2 · d) with an average of (91.62 ± 109.75) nmol / (m2 · d) National Sea shelf may be the world’s oceans, atmosphere isoprene important source of much-needed research work related to unfold.