Key Laboratory of Marine Chemistry Theory and Technology, Ocean University of China, Ministry of Education/Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China.
Key Laboratory of Marine Chemistry Theory and Technology, Ocean University of China, Ministry of Education/Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China.
Chemosphere. 2017 Jul;178:291-300. doi: 10.1016/j.chemosphere.2017.03.037. Epub 2017 Mar 21.
Spatial distribution and sea-to-air flux of isoprene in the East China Sea and the South Yellow Sea in July 2013 were investigated. This study is the first to report the concentrations of isoprene in the China marginal seas. Isoprene concentrations in the surface seawater during summer ranged from 32.46 to 173.5 pM, with an average of 83.62 ± 29.22 pM. Distribution of isoprene in the study area was influenced by the diluted water from the Yangtze River, which stimulated higher in-situ phytoplankton production of isoprene rather than direct freshwater input. Variations in isoprene concentrations were found to be diurnal, with high values observed during daytime. A significant correlation was observed between isoprene and chlorophyll a in the study area. Relatively higher isoprene concentrations were recorded at stations where the phytoplankton biomass was dominated by Chaetoceros, Skeletonema, Pennate-nitzschia, and Thalassiosira. Positive correlation was observed between isoprene and methyl iodide. In addition, sea-to-air fluxes of isoprene approximately ranged from 22.17 nmol m d-537.2 nmol m d, with an average of 161.5 ± 133.3 nmol m d. These results indicate that the coastal and shelf areas may be important sources of atmospheric isoprene.
2013 年 7 月，调查了东海和南黄海的异戊二烯的空间分布和海-气通量。本研究首次报道了中国边缘海的异戊二烯浓度。夏季表层海水中异戊二烯浓度范围为 32.46 至 173.5 pM，平均值为 83.62 ± 29.22 pM。研究区域内异戊二烯的分布受长江稀释水的影响，这刺激了更高的原位浮游植物异戊二烯的产生，而不是直接的淡水输入。发现异戊二烯浓度存在昼夜变化，白天观测到较高值。在研究区域内，异戊二烯与叶绿素 a 之间存在显著相关性。在浮游植物生物量主要由角毛藻、 skeletonema、Pennate-nitzschia 和 Thalassiosira 主导的站点记录到相对较高的异戊二烯浓度。异戊二烯与碘甲烷之间存在正相关关系。此外，海-气通量的异戊二烯范围约为 22.17 nmol m d-537.2 nmol m d，平均值为 161.5 ± 133.3 nmol m d。这些结果表明，沿海和陆架区可能是大气异戊二烯的重要来源。
