Distribution and sea-to-air flux of isoprene in the East China Sea and the South Yellow Sea during summer.
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-2d-1-537.2 nmol m-2d-1, with an average of 161.5 ± 133.3 nmol m-2d-1. These results indicate that the coastal and shelf areas may be important sources of atmospheric isoprene.
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.
Jian-Long
JL
Li
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. Electronic address: honghaizhang@ouc.edu.cn.
Hong-Hai
HH
Zhang
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; Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Institute of Marine Chemistry, Ocean University of China, Qingdao 266100, China. Electronic address: gpyang@ouc.edu.cn.
Gui-Peng
GP
Yang
D000393:Air Pollutants / Q000737:chemistry*; D018533:Biomass; D002070:Butadienes / Q000032:analysis*; D002681:China; D002734:Chlorophyll / Q000032:analysis; D000077194:Chlorophyll A; D045782:Hemiterpenes / Q000032:analysis*; D010420:Pentanes / Q000032:analysis*; D010839:Phytoplankton / Q000378:metabolism; D045483:Rivers; D012621:Seasons; D012623:Seawater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D000393:Air Pollutants; D002070:Butadienes; D045782:Hemiterpenes; D010420:Pentanes; D014874:Water Pollutants, Chemical; C005059:isoprene; D002734:Chlorophyll; D000077194:Chlorophyll A
Distribution; East China Sea; Isoprene; Phytoplankton; Sea-to-air flux; South Yellow Sea