基于海水环境和气象参数经验公式估算的东海海-气CO2通量

李熠; 何海伦; 陈大可

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海洋学研究 ›› 2012, Vol. 30 ›› Issue (3) : 30-40.

基于海水环境和气象参数经验公式估算的东海海-气CO₂通量

李熠¹, 何海伦^1,2, 陈大可^*1

作者信息 +

Air-sea CO₂ flux in the East China Sea estimated by empirical formula based on the parameters of

LI Yi¹, HE Hai-lun^1,2, CHEN Da-ke^*1

Author information +

文章历史 +

摘要

使用 World Ocean Altas 2009提供的气候态月平均温度、盐度和磷酸盐浓度资料,以及Globalview和NCEP的大气资料, 借助较为可靠的经验公式,估算了东海海表CO₂分压(pCO₂ )和海-气CO₂通量的平均分布特征和季节变化。结果表明,pCO₂的空间分布形态四季大体相同, 但其强度随季节变化, 春、冬季低,夏、秋季高。CO₂通量在东海陆架区为汇,汇的强度从NW向SE逐渐减弱;在黑潮区为源,强度从SW向NE逐渐减弱。东海整体于春、冬季为CO₂的汇,夏、秋季为CO₂的源。进一步分析东海pCO₂和CO₂通量季节变化的主要影响因子表明,东海海表pCO₂变化主要受温度控制,而在陆架区,盐度和磷酸盐的作用不可忽略。东海整体CO₂通量变化在4至10月由风速主导,11月至翌年3月由海表pCO₂控制;陆架区CO₂通量的季节变化主要由风速决定;黑潮区CO₂通量的变化在夏季由风速主导,秋季由风速和pCO₂共同影响。

Abstract

Using the empirical formula of TSUNOGAI et al, a preliminary study was made on the climatological distribution and seasonal variation of the sea surface pCO₂ and air-sea CO₂ flux in the East China Sea,and the influence of sea surface temperature, salinity, phosphate concentration and wind speed. The formula was based on environmental parameters ( sea surface temperature, salinity and phosphate concentration). The data used were from WOA09 ( monthly mean climatological sea surface temperature, salinity and phosphate concentration) ,Globalview ( atmospheric pCO₂ ) and NCEP ( monthly mean wind speed). The spatial distribution of the calculated pCO₂ maintains a gradually increasing trend from the northwest to the southeast while its magnitude varies significantly with seasons, lower in spring and winter, higher in summer and autumn. Space-time pattern of the CO₂ flux varies obviously, the continental shelf region as a whole is the convergence of CO₂ from atmosphere, while the Kuroshio region is the source. The convergence intensity gradually weakens from the northwest to the southeast and that of source strengthens from the north to the south. The East China Sea uptake CO₂ from atmosphere in spring and winter while release CO₂ to atmosphere in summer and autumn.
Analysis of seasonal change of the sea surface pCO₂ in the East China Sea shows that SST is its main controlling factor. They change in the same phase, reache the maximum in summer and minimum in winter. In the Kuroshio area, salinity and phosphate concentration remains stable all the year round, their seasonal variations could be neglected and the variation of pCO₂ is completely controlled by temperature. In the continental shelf area, the changes of salinity and phosphate concentration are contrary to that of temperature,but the magnitude is relatively low. The seasonal change of pCO₂ is still controlled by SST in most of the months except June,July and December,when the role of salinity and phosphate concentration tops that of SST.
For the East China Sea as a whole, the CO₂ flux changes with the wind speed from April to October, indicating that the wind speed is the leading role in the air-sea CO₂ exchange. During this period, the wind speed changes significantly due to monsoon conversion, which has great impacts on the CO₂ flux. From November to March, the CO₂ flux changes with sea surface pCO₂, when the wind speed remains high all along and pCO₂ varies significantly. In the continental shelf area, the surface pCO₂ remains lower than the atmosphere pressure all along,and the CO₂ flux is smaller than zero, its magnitude is closely related to the wing speed,and obviously high in winter except for a relatively high value in July associated with the strengthening of summer monsoon. The CO2 flux in the Kuroshio area is year-round positive and has a maximum in June-July and October-November respectively. The extreme value in June-July is closely related to summer monsoon enhancement,while that in October-November to the start of the winter monsoon and wind speed enhancement. It should be noted that though the wind speed is strong in winter, the CO₂ flux is not great because of comparatively low surface pCO₂. The variation of CO₂ flux in Kuroshio area is controlled by both wind speed and surface pCO₂.

导出引用

李熠, 何海伦, 陈大可. 基于海水环境和气象参数经验公式估算的东海海-气CO₂通量[J]. 海洋学研究. 2012, 30(3): 30-40

LI Yi, HE Hai-lun, CHEN Da-ke. Air-sea CO₂ flux in the East China Sea estimated by empirical formula based on the parameters of[J]. Journal of Marine Sciences. 2012, 30(3): 30-40

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