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Liu Sumin,Hong Bo,Wang Guifen,Wang Weiqiang,Xie Qiang,Ni Zekai,Yu Liu,Jiang Huichang,Long Tong,Xu Hongzhou. 2020. Physical structure and phytoplankton community off the eastern Hainan coast during summer 2015. Acta Oceanologica Sinica, 39(11):103-114
Physical structure and phytoplankton community off the eastern Hainan coast during summer 2015
2015年夏季海南岛东部沿岸物理结构及浮游植物群落
Received:May 09, 2020  
DOI:10.1007/s13131-020-1668-z
Key words:eastern Hainan upwelling  cold tongue  dissolved oxygen  phytoplankton community
中文关键词:  琼东上升流  冷舌  溶解氧  浮游植物群落结构
基金项目:The National Key Research and Development Program of China under contract No. 2018YFC0309800; the National Natural Science Foundation of China under contract Nos 41666001, 41576006, 41976014, 41776045; the Chinese Academy of Sciences Frontier Basic Research Project under contract No. QYJC201910; the Sanya Governmental Academy-Locality S&T Cooperation Program under contract No. 2015YD28.
Author NameAffiliationE-mail
Liu Sumin State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China
Graduate School, University of Chinese Academy of Sciences, Beijing 100049, China 
 
Hong Bo South China University of Technology, Guangzhou 510641, China bohong@scut.edu.cn 
Wang Guifen Hohai University, Nanjing 210098, China  
Wang Weiqiang State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China  
Xie Qiang Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China
Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China 
 
Ni Zekai Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China  
Yu Liu Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China  
Jiang Huichang Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China  
Long Tong Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China  
Xu Hongzhou Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China hzxu@idsse.ac.cn 
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Abstract:
      Based on satellite remote sensing dataset and survey data during upwelling season of 2015, the spatial structures of phytoplankton biomass and community for the first time in the eastern Hainan upwelling (EHU) and its adjacent area, the eastern Leizhou Peninsula upwelling (ELPU) were illustrated. It is found that a significant cold tongue with high salinity and low temperature along the eastern Hainan coast driven by upwelling-favorable summer monsoon. The ELPU was relative weaker than the EHU because of its wide and gentle continental slope. Due to mixing by tides and waves, DO concentration with high value (>6.0 mg/L) were almost homogenous from surface to 30 m depth at the EHU. Beneath that, low DO water (<6.0 mg/L, anoxia) were pumped upward from bottom by the upwelling. The ELPU has worse DO condition compared with the EHU where bottom DO were lower than 3.5 mg/L owing to abundant DO consumption. The phytoplankton biomass reached maximal value about 1.5 mg/m3 at 30 m depth layer rather than surface layer at the EHU indicating the impact limit of upwelling on phytoplankton growth and DO distribution. Nourished by rich nutrient input, the phytoplankton biomass at the ELPU were much higher than the EHU where the maximal value can reach about 4.0 mg/m3. The phytoplankton biomass were reduced to about 0.2–0.3 mg/m3 at the offshore areas of the EHU and ELPU which were close to the value at open sea. At the inshore of the EHU, the phytoplankton community was dominated by diatom which accounted for about 50% of phytoplankton biomass. And prokaryotes (about 40%), green algae (about 20%) and prochlorococcus (about 20%) became main species at the offshore of the EHU. At the ELPU, diatom accounted for about 80% of phytoplankton biomass followed by green algae, indicating a different ecosystem at this region compared with the EHU.
中文摘要:
      琼东上升流(EHU)是南海北部最强劲的上升流系统之一。它的水动力过程已经被很多研究所揭示,但是它的浮游植物群落依然不清楚。通过利用卫星遥感数据和2015年上升流季节的航次数据,我们首次阐明了琼东上升流区域(EHU)和其临近区域雷州半岛东部上升流区(ELPU)浮游植物生物量和群落的空间结构。在夏季季风的驱动下,我们在琼东沿岸发现了一个显著的低温高盐冷舌。由于雷州半岛东部大陆架宽广平缓,ELPU比EHU相对较弱。在EHU,由于受潮汐和风浪混合的影响,高溶解氧浓度 (>6.0 mg/l)几乎从表层延伸到30米深度。其次,低溶解氧的海水(<6.0 mg/l, 缺氧)被上升流从底层抽吸到上层。ELPU和EHU相比有更差的DO状况,在EHU,底层DO浓度由于大量的消耗,浓度甚至低于3.5 mg/l。在EHU,浮游植物生物量最大值出现在30米水层而不是在表层,约为1.5 mg/m3。这表明了上升流对于浮游植物生长和DO分布的影响范围。由于营养物质输入丰富, ELPU处的浮游植物生物量比EHU高很多。在EHU处,浮游植物生物量最大值可以达到4.0 mg/m3。浮游植物生物量在EHU和ELPU的沿岸区域则降低到了大约0.2~0.3 mg/m3,而这个值与远海接近。在EHU的近岸,浮游植物群落结构被硅藻所主宰,大约占了浮游植物生物量的50%。原核生物(大约40%)、绿藻(大约20%)、原绿球藻(大约20%)组成了EHU的近岸的主要群落。在ELPU,硅藻大约占了浮游植物生物量的80%,其次是绿藻,这表明与EHU相比,这个区域是一个相对不同的生态系统。
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