首页|El Ni(n)o影响下春季南海北部表层水体CO2分压变化

El Ni(n)o影响下春季南海北部表层水体CO2分压变化

The changes of partial pressure of carbon dioxide in surface water in the northern South China Sea under the influence of El Ni（n）o in spring

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采用走航连续观测系统分别在2011年5月和2015年5月对南海北部表层水体温度、盐度、溶解氧、叶绿素a和pCO2进行了现场观测.在El Ni(n)o影响下,2015年5月华南地区及广东省降雨量偏多,大量冲淡水人海,南海北部冲淡水区域海表盐度显著降低,2015年5月冲淡水区域海表盐度平均值为(28.05±6.18),低于2011年5月的海表盐度平均值(29.65±2.58),同时实测冲淡水区域海表温度平均升高约2.10℃.冲淡水携带的营养物质和适度升高的海表温度共同促进了冲淡水区域浮游植物的繁殖.浮游植物光合作用不断地将海水中的游离CO2转化为有机碳,同时释放出氧气,使得水体pCO2降低,2015年5月冲淡水区域pCO2平均值为(286±95) μatm,低于2011年5月的pCO2平均值(300±42)μatm.2015年5月实测获得离岸海域pCO2平均值为(421±9) μatm,高于2011年5月pCO2平均值(386±13)μatm,二者差值为35μatm,海表温度是离岸海域pCO2的主要影响因子,2015年5月ElNi(n)o期间离岸海域SST升高1.96℃.E1Ni(n)o影响下冲淡水区域的碳忙作用增加,离岸海域的碳源作用增强,冲淡水区域碳汇增加与离岸海域碳源增强基本抵消,2015年5月南海北部整体仍是CO2弱汇区,约为-0.40 mmol·m-2·d-1,与2011年5月通量值-0.58 mmol· m-2·d-1差别不明显.
The sea surface temperature(SST),salinity(SSS),dissolved oxygen (DO) content,chlorophyll a(Chl a) content and surface partial pressure of carbon dioxide (pCO2) were measured with underway measurement system in the northern South China Sea (NSCS) in May 2011 and May 2015.Rainfall in South China and Guangdong province increased in May 2015 due to the influence of El Ni(n)o,a large amount of diluted water was discharged into nearshore area,and the SSS in the diluted water area decreased to (28.05±6.18),which was lower than that in May 2011 (29.65±2.58),meanwhile the averaged SST in the diluted water was 2.10 ℃ higher than that in May 2011.The abundant nutrients brought by the diluted water and higher SST jointly promoted phytoplankton propagation,which absorbed a mount of CO2 from sea water and released O2.The average of pCO2 in diluted water area was (286±95) μatm in May 2015,which was lower than (300±42) μatm of pCO2 in May 2011.SST was the major contmlling factor of pCO2 in offshore area,and rose by 1.96 ℃ during El Ni(n)o,which led to the increase ofpCO2.The averaged pCO2 in offshore waters was (421±9) μatm in May 2015 and (386± 13) μatm in May 2011,respectively.The influence of E1 Ni(n)o made carbon sink increase in diluted water area and carbon source enhance in offshore area,however,those two processes offset mostly each other.The NSCS was still a weak CO2 sink of-0.40 mmol· m-2· d-1 in May 2015,similar to the flux of-0.58 mmol·m-2·d-1in May 2011.

the northern South China Sea(NSCS)El Ni(n)osea-air fluxpartial pressure of carbon dioxidesea surface temperature(SST)sea surface salinity(SSS)dissolved oxygen(DO)

马玉、高全洲、李团结、蔡钰灿、张乾柱、史华明、张军晓、王迪

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中山大学地理科学与规划学院,广东省城市化与地理环境空间模拟重点实验室,广州510275

国家海洋局南海调查技术中心,广州510300

广东省地质过程与矿产资源探查重点实验室,广州510275

南海北部 厄尔尼诺 pCO2 海-气交换通量 海表温度 海表盐度 溶解氧

广东省自然科学基金国家自然科学基金国家自然科学基金

2014A0303110034134001941071054

2016

10.13671/j.hjkxxb.2016.0210

环境科学学报
中国科学院生态环境研究中心

环境科学学报

CSTPCDCSCD北大核心
影响因子：1.645
ISSN：0253-2468
年,卷(期)：2016.36(10)
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