Carbon dioxide emissions from lakes and reservoirs of China: A regional estimate based on the calculated pCO2
Carbon dioxide emissions from lakes and reservoirs of China: A regional estimate based on the calculated pCO2
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中国湖泊水库二氧化碳排放：基于pCO(2)计算的区域估算
DOI：
10.1016/j.atmosenv.2017.09.032
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发表时间：
2017-12
影响因子：
5
通讯作者：
Lijiang Chen
中科院分区：
文献类型：
--
作者：
Zhidan Wen;Song KS;Yingxin Shang;Chong Fang;Lin Li;Lili Lv;Xianguo Lv;Lijiang Chen
根据中国207个湖泊和84个水库夏末的CO2分压（pCO 2）计算值，评价了内陆水在与大气CO2交换中的作用。结果表明，近60%的水体相对于大气CO2处于过饱和状态，水库样品的平均pCO 2值高于湖泊。淡水湖泊的pCO 2平均值约为盐湖的3.5倍。将湖泊水库划分为5个组群（内蒙古-新疆高原区、青藏高原区、东北平原山区、云贵高原区和东部平原区）。云贵高原地区的pCO 2浓度最高，这可能是由于典型的岩溶地貌，岩溶作用可能会促进水相CO2浓度的增加，岩溶作用对大气CO2的捕获具有显著的影响。内蒙古-新疆高原和青藏高原地区水库对大气的CO2通量为负，其他沃茨对大气的CO2通量均为过饱和。分析了pCO 2与环境变量之间的关系，结果表明，总磷、溶解性有机物、总悬浮物等指标在个别区域与pCO 2存在相关性，但在所有调查的沃茨中均未观察到这种相关性。这表明，在小区域尺度下，用环境因子预测湖泊pCO 2可能比扩大尺度更有效。因此，由于环境和水质条件的变化，将研究区域的CO2浓度或排放通量外推到更大尺度的常用算法可能不准确。
The role of inland water in CO2exchange with the atmosphere was evaluated on the basis of calculated partial pressure of CO2(pCO2) from sampling of 207 lakes and 84 reservoirs across China in late summer. The results suggested that almost 60% of these water bodies were supersaturated with CO2with respect to atmosphere, and the collected reservoirs samples exhibited higher meanpCO2than lakes. The meanpCO2in fresh water lakes was about 3.5 times of the value in saline lakes. The lakes and reservoirs were divided into five groups (Inner Mongolia -Xinjiang plateau region, Tibetan Plateau region, Northeastern plain and mountainous region, Yunnan- Guizhou Plateau region, and Eastern plain region). The Yunnan- Guizhou Plateau region showed the highestpCO2compared with other regions, most likely due to the typical karst landforms, karst processes may promote aqueous CO2concentration, and karstification has a significant effect on the capture of atmospheric CO2. Inner Mongolia-Xinjiang plateau and Tibetan Plateau region reserviors showed negative CO2flux to atmosphere, other waters in this study all supersaturated with CO2with respect to the atmosphere. A which We analyzed the relationship betweenpCO2and environmental variables, and results showed that some indicators had correlations withpCO2in individual region such as total phosphorus, dissolved organic matter, and total suspended solids, but the relationship could not be observed with all surveyed waters. This indicated that it might be much more effective in a smaller regional scale than the broadened scale when the environmental factors were used as the predictor ofpCO2in lakes. Therefore, the common algorithm that extrapolates CO2concentration or emission flux from the study region to a wider scale might not be accurate because of the changes in the environmental and water quality conditions.
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DOI：
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