南海北部春季非水华期的CO<sub>2</sub>分压及其调控

翟惟东

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翟惟东.南海北部春季非水华期的CO₂分压及其调控[J].海洋学报,2015,37(6):31-40

南海北部春季非水华期的CO₂分压及其调控

Sea surface partial pressure of CO₂ and its controls in the northern South China Sea in the non-bloom period in spring

投稿时间：2014-10-08

DOI：10.3969/j.issn.0253-4193.2015.06.004

中文关键词: CO₂分压温度效应南海北部吕宋海峡

英文关键词:partial pressure of CO₂ temperature effect northern South China Sea Luzon Strait

基金项目:国家海洋局海洋环境评价方法研究项目(DOMEP-MEA-01-10); 海洋公益性行业科研专项(201505003)。

作者	单位
翟惟东	国家海洋环境监测中心, 辽宁大连 116023 厦门大学近海海洋环境科学国家重点实验室, 福建厦门 361102

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中文摘要:

针对南海北部和吕宋海峡附近海域的海-气CO₂通量及其调控问题,研究了2009年3月底至4月中旬在这些海域通过走航观测的方法取得的海-气CO₂分压和海表温度、盐度等相关数据。结果表明,在河口、沿岸流以外的南海北部开阔海域,与大气平衡的CO₂分压分布在368~380 μatm,南低北高,平均值为371 μatm;而海表CO₂分压分布在293~405 μatm,南高北低。南海北部开阔海域的海表CO₂分压主要受温度效应调控,也在一定程度上受水团混合、海-气交换、生物活动等非温度效应的影响。在相同水温条件下,黑潮区的海表CO₂分压比南海北部的海表CO₂分压低。本研究和大多数前人研究的结果都表明,南海北部海盆区域和吕宋海峡西侧海域在春季与大气CO₂接近源汇平衡,而非大气CO₂的显著源区。

英文摘要:

To clarify air-sea CO₂ flux and the controls in the northern South China Sea (SCS) and the adjacent open sea areas around the Luzon Strait, a new dataset of sea surface and atmospheric partial pressures of CO₂ (pCO₂) associated with underway temperature and salinity obtained from late March to mid-April in 2009 was investigated. In the northern SCS open sea areas other than those estuaries and the coastal current area, atmospheric pCO₂ increased from 368 μatm at a south site to 380 μatm at a north site, with the average of 371 μatm, while sea surface pCO₂ declined from 405 μatm in the south area to 293 μatm in the north area. The northern SCS pCO₂ was significantly influenced by sea surface temperature, although non-temperature effects such as water mixing, air-sea exchanges, and biological activities also affected the sea surface pCO₂ distribution. In the Kuroshio-influenced area around the Luzon Strait, however, sea surface pCO₂ in given water temperature was generally lower than that in the northern SCS. Based on this dataset, the author suggested that, the springtime CO₂ uptake in the northern SCS basin area and the area west of the Luzon Strait from the atmosphere was nearly equal to CO₂ release to the atmosphere at the same time, which is similar to the consensus in relevant literatures based on qualified data. The earlier report published in Haiyang Xuebao in 2014 suggesting that the northeast part of the SCS serves as a significant source of the atmospheric CO₂ in spring is questionable.

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