秋季黄河<i>p</i>CO<sub>2</sub>控制因素及水-气界面通量

张龙军; 徐雪梅; 温志超

秋季黄河pCO₂控制因素及水-气界面通量

中国海洋大学海洋环境与生态教育部重点实验室, 山东, 青岛, 266100

基金项目: 国家重点基础研究发展计划(973)资助项目(2002CB412501);国家自然科学基金资助项目(40476063)

详细信息

作者简介:
张龙军(1955- ),男,山东潍坊人,教授,博士,主要从事海洋和河流碳循环研究.E-mail:longjunz@ouc

中图分类号: X143

Control factors of pCO₂ and CO₂ degassing fluxes from the Yellow River in autumn

Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China

Funds: The study isfinancially supported by the National Basic Research Program of China (No.2002CB412501) and the National Natural Science Foundation of China (No.40476063)

摘要: 根据2006年11月1~10日,秋季黄河平水期二氧化碳分压(pCO₂)的现场实测数据及相关同步观测资料,对黄河表层水pCO₂的分布及其影响因素进行了研究。结果表明:水体pCO₂在80~166Pa,平均值110Pa,在世界主要河流中属中等偏下水平;空间分布存在较大的不均匀性,中游高于上游和下游。浮游植物的光合作用对pCO₂有一定的影响但强度较弱,即使在叶绿素最高值3.58μg/L的包头站pCO₂仍达到91Pa。黄河水体有机物含量较低且继承了陆源有机物难降解的特性,干流和库区EpCO₂/AOU的比值为0.14和0.20,远低于生物好氧呼吸作用控制水体pCO₂的理论下限0.62,因此,生物好氧呼吸作用对水体pCO₂的贡献不大。悬浮物(TSS)含量为3.77~1308mg/L,溶解无机碳(DIC)含量为3.03~4.14mmol/L,普遍高于世界其它河流且最大值均出现在潼关站;同时水体pCO₂与TSS、PIC、DIC含量具有极好的正相关性。因此黄河流域强烈的机械侵蚀和化学风化作用形成的碳酸盐体系是控制水体pCO₂的主要因素。利用Wanninkhof提出的淡水水-气交换系数的通量模式估算,黄河水域水-气界面CO₂交换速率约为0.229μmol/m²·s,秋季可向大气释放CO₂14.5亿moL,相当于8250km²草原或是112km²森林一年的固碳量。黄河CO₂释放通量与渥太华河相近,但要远小于亚马逊河。
- 黄河 /
- 二氧化碳分压pCO₂ /
- 控制因素 /
- 水-气界面CO₂通量
Abstract: The partial pressure of CO₂(pCO₂) in the water of the Yellow River was directly measured in November 2006,and the distribution and dynamics of pCO₂ are discovered in the combination of the related parameters.The results indicate that the pCO₂ in the surface water ranges between 80 and 166 Pa,with an average value of 110 Pa,and is lower than that in other important rivers in the world.Furthermore,the significant variations in the spatial pCO₂ distribution,i.e,the pCO₂ value in the middle part of the river is higher than upstream and downstream.Photosynthesis of phytoplankton has a slight effect on pCO₂, even though Chla reaches the maximum 3.58 μg/L at Baotou station where the pCO₂ value is still 91 Pa.Since the organic matter level in the Yellow River water is low and hard to degrade,the EpCO₂/AOU value just varies from 0.14 to 0.20 in the mainstream and reserwir,lower than the theoretical value of 0.62,which suggests that the biological aerobic respiration effect has little contribution to pCO₂.The content of TSS and DIC in the Yellow River water varies from 3.77 to 1308.33 mg/L and from 3.03 to 4.14 mmol/L,respectively,both of which are generally higher than other rivers in the world,and the maximum appears at Tongguan.Meanwhile the pCO₂ has a positive relationships with TSS,PIC and DIC.So the main control factors of pCO₂ are attributed to the carbonate system with high carbonate content induced by the strong mechanical erosion and chemical weathering in the Yellow River drainage area.Based on the model of wanninkhof and the wind speed,the released CO₂ from the Yellow River to atmosphere is estimated about 14.5×10⁸ mol in autumn at the rate of 0.229 μmol/(m²·s),which is equal to the CO₂ absorption of 8 250 km² grass or 112 kmz forest.CO₂ outgassing flux from the Yellow River is close to that of the Ottawa River and less than the Amawn River.
- Yellow River /
- partial pressure of CO₂(pCO₂) /
- control factors /
- air-water interface

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秋季黄河pCO₂控制因素及水-气界面通量

作者简介:
张龙军(1955- ),男,山东潍坊人,教授,博士,主要从事海洋和河流碳循环研究.E-mail:longjunz@ouc

Control factors of pCO₂ and CO₂ degassing fluxes from the Yellow River in autumn

计量

秋季黄河pCO₂控制因素及水-气界面通量

中国海洋大学海洋环境与生态教育部重点实验室, 山东, 青岛, 266100

作者简介:
张龙军(1955- ),男,山东潍坊人,教授,博士,主要从事海洋和河流碳循环研究.E-mail:longjunz@ouc

English Abstract

Control factors of pCO₂ and CO₂ degassing fluxes from the Yellow River in autumn

Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China

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秋季黄河pCO2控制因素及水-气界面通量

作者简介: 张龙军(1955- ),男,山东潍坊人,教授,博士,主要从事海洋和河流碳循环研究.E-mail:longjunz@ouc

Control factors of pCO2 and CO2 degassing fluxes from the Yellow River in autumn

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秋季黄河pCO2控制因素及水-气界面通量

中国海洋大学海洋环境与生态教育部重点实验室, 山东, 青岛, 266100

作者简介: 张龙军(1955- ),男,山东潍坊人,教授,博士,主要从事海洋和河流碳循环研究.E-mail:longjunz@ouc

English Abstract

Control factors of pCO2 and CO2 degassing fluxes from the Yellow River in autumn

Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China

全文HTML

目录

秋季黄河pCO₂控制因素及水-气界面通量

作者简介:
张龙军(1955- ),男,山东潍坊人,教授,博士,主要从事海洋和河流碳循环研究.E-mail:longjunz@ouc

Control factors of pCO₂ and CO₂ degassing fluxes from the Yellow River in autumn

秋季黄河pCO₂控制因素及水-气界面通量

作者简介:
张龙军(1955- ),男,山东潍坊人,教授,博士,主要从事海洋和河流碳循环研究.E-mail:longjunz@ouc

Control factors of pCO₂ and CO₂ degassing fluxes from the Yellow River in autumn