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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年夏季海南島東部沿岸物理結構及浮游植物群落
    Received:May 09, 2020  
    DOI:10.1007/s13131-020-1668-z
    Key words:eastern Hainan upwelling  cold tongue  dissolved oxygen  phytoplankton community
    中文關鍵詞:  瓊東上升流  冷舌  溶解氧  浮游植物群落結構
    基金項目: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:
          瓊東上升流(EHU)是南海北部最強勁的上升流系統之一。它的水動力過程已經被很多研究所揭示,但是它的浮游植物群落依然不清楚。通過利用衛星遙感數據和2015年上升流季節的航次數據,我們首次闡明了瓊東上升流區域(EHU)和其臨近區域雷州半島東部上升流區(ELPU)浮游植物生物量和群落的空間結構。在夏季季風的驅動下,我們在瓊東沿岸發現了一個顯著的低溫高鹽冷舌。由于雷州半島東部大陸架寬廣平緩,ELPU比EHU相對較弱。在EHU,由于受潮汐和風浪混合的影響,高溶解氧濃度 (>6.0 mg/l)幾乎從表層延伸到30米深度。其次,低溶解氧的海水(<6.0 mg/l, 缺氧)被上升流從底層抽吸到上層。ELPU和EHU相比有更差的DO狀況,在EHU,底層DO濃度由于大量的消耗,濃度甚至低于3.5 mg/l。在EHU,浮游植物生物量最大值出現在30米水層而不是在表層,約為1.5 mg/m3。這表明了上升流對于浮游植物生長和DO分布的影響范圍。由于營養物質輸入豐富, ELPU處的浮游植物生物量比EHU高很多。在EHU處,浮游植物生物量最大值可以達到4.0 mg/m3。浮游植物生物量在EHU和ELPU的沿岸區域則降低到了大約0.2~0.3 mg/m3,而這個值與遠海接近。在EHU的近岸,浮游植物群落結構被硅藻所主宰,大約占了浮游植物生物量的50%。原核生物(大約40%)、綠藻(大約20%)、原綠球藻(大約20%)組成了EHU的近岸的主要群落。在ELPU,硅藻大約占了浮游植物生物量的80%,其次是綠藻,這表明與EHU相比,這個區域是一個相對不同的生態系統。
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