摘要
采用船载海−气CO2连续观测系统于2011年和2014年夏季在琼州海峡开展了现场观测,分析研究了表层海水二氧化碳分压(pCO2)时空变化及其影响因子。2011年和2014年夏季pCO2分别为(516±29)μatm和(533±15)μatm,海−气CO2交换通量分别为(8.4±1.7)mmol/(m^2·d)和(4.5±0.4)mmol/(m^2·d),均是大气CO2的强源,高于相邻及相似海域,主要受控于东口海域上升流和海峡中部狭管效应。2011年夏季东口上升流增大pCO2的同时也促进了浮游植物繁殖,光合作用吸收水体CO2,降低了pCO2,而且受其影响,西口口门附近叶绿素a和溶解氧含量陡增,pCO2突降。2014年夏季东口海域上升流较弱,且观测海域垂直混合作用显著,pCO2和溶解氧分布特征与2001年夏季明显不同。海峡中部狭管效应造成水体输运速率大、混合作用强,浮游植物“来不及”生长,pCO2较高。
The sea surface temperature(SST),salinity(SSS),dissolved oxygen(DO),chlorophyll a(Chl a)and surface partial pressure of carbon dioxide(pCO2)was determined by underway measurement system in the Qiongzhou Strait in summer 2011 and 2014,and the spatiotemporal variations of pCO2 were analyzed and its control factors were explained.The averages of pCO2 in surface sea water were(516±29)μatm and(533±15)μatm,sea-air CO2 fluxes were(8.4±1.7)mmol/(m^2·d)and(4.5±0.4)mmol/(m^2·d)in summer 2011 and 2014,the Qiongzhou Strait acted as strong atmospheric CO2 source and was more higher than the adjacent and similar sea areas.The upwelling forced the CO2-enriched subsurface water to intrude the surface water and elevated pCO2 in the east mouth,also promoted biological productivity and absorbed CO2 from sea water,and also made the pCO2 drop and DO rise sharply in the vicinity of west mouth in summer 2011.The upwelling was weak in east mouth and vertical mixing was strong along ship-track in summer 2014,the distributions of pCO2 and DO were obviously different from that in summer 2011.Narrow channel effect was significant in the middle of Qiongzhou Strait,high water transportation speed with strong mixing resulted in weak photosynthetic activity,they altogether maintained high pCO2 in summer 2011 and 2014.
作者
马玉
廖世智
李锐祥
蔡钰灿
曹永港
许春玲
史华明
王迪
许欣
Ma Yu;Liao Shizhi;Li Ruixiang;Cai Yucan;Cao Yonggang;Xu Chunling;Shi Huaming;Wang Di;Xu Xin(South China Sea Marine Survey and Technology Center,State Oceanic Administration,Guangzhou 510300,China;Key Laboratory of Marine Environmental Survey Technology and Application,Ministry of Natural Resources,Guangzhou 510300,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2020年第12期110-118,共9页
基金
海洋观测预报与防灾减灾(2200128)。
关键词
琼州海峡
二氧化碳分压
上升流
狭管效应
the Qiongzhou Strait
partial pressure of carbon dioxide
upwelling
narrow channel effect
作者简介
马玉(1982-),男,安徽省亳州市人,博士,高级工程师,从事海洋生物地球化学研究。E-mail:362005949@qq.com。
