| Carbon dioxide partial pressure and carbon fluxes of air-water interface in Taihu Lake, China |
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| 作者姓名： | 范成新 胡维平 Phillip W. Ford 陈宇炜 瞿文川 张路 |
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| 作者单位： | Nanjing Institute of Geography & Limnology，Chinese Academy of Sciences，Nanjing 210008，China，Nanjing Institute of Geography & Limnology，Chinese Academy of Sciences，Nanjing 210008，China，CSIRO Land and Water，GPO Box 1666，Canberra，ACT 2601，Australia，Nanjing Institute of Geography & Limnology，Chinese Academy of Sciences，Nanjing 210008，China，Nanjing Institute of Geography & Limnology，Chinese Academy of Sciences，Nanjing 210008，China，Nanjing Institute of Geography & Limnology，Chinese Academy of Sciences，Nanjing 210008，China |
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| 基金项目： | This research was supported by the Knowledge Innovation Project of Chinese Academy of Sciences （KZCXI-SW-01-15） and （KZCXI-SW-12） |
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| 摘 要： | 1 INTRODUCTION Carbon dioxide (CO2) is principal greenhouse gas. Its air-water exchange is important in terrestrial ecosystems for climate change (Frankignoulle et al., 1998; Schimel et al., 2001). The direction of CO2 gas movement depends on the CO2 concentration gradient between air and surface water. The amount of CO2 exchange is related to the gas exchange coefficient, k. All lakes, with their small area but large atmospheric CO2 flux are important to under-stand the CO2 fluxes …
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| 关 键 词： | 二氧化碳 太湖 海洋化学 空气-水分界面 溶解气体 |
| 收稿时间： | 2004-01-22 |
| 修稿时间： | 2004-11-16 |
Carbon dioxide partial pressure and carbon fluxes of air-water interface in Taihu Lake, China |
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| Fan Chengxin,Hu Weiping,Phillip W. Ford,Chen Yuwei,Qu Wenchuan,Zhang Lu.Carbon dioxide partial pressure and carbon fluxes of air-water interface in Taihu Lake, China[J].Chinese Journal of Oceanology and Limnology,2005,23(1):29-38. |
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| Authors: | Fan Chengxin Hu Weiping Phillip W Ford Chen Yuwei Qu Wenchuan Zhang Lu |
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| Institution: | (1) Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, 210008 Nanjing, China;(2) CSIRO Land and Water, GPO Box 1666, 2601 Canberra, ACT, Australia |
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| Abstract: | To obtain carbon dioxide (CO2) flux between water-air interface of Taihu lake, monthly water samplers at 14 sites and the local meteorological data of
the lake were collected and analyzed in 1998. Carbon dioxide partial pressures (pCO2) at air-water interface in the lake were calculated using alkalinity, pH, ionic strength, active coefficient, and water temperature.
The carbon fluxes at different sublakes and areas were estimated by concentration gradient between water and air in consideration
of Schmidt numbers of 600 and daily mean windspeed at 10 m above water surface. The results indicated that the mean values
of pCO2 in Wuli Lake, Meiliang Bay, hydrophyte area, west littoral zone, riverine mouths, and the open lake areas were 1 807.8±1
071.4 (mean±standard deviation) μatm (1atm=1.013 25×105Pa), 416.3±217.0 μatm, 576.5±758.8 μatm, 304.2±243.5 μatm, 1 933.6±1 144.7 μatm, and 448.5±202.6 μatm, respectively. Maximum
and minimum pCO2 values were found in the hypertrophic (4 053.7 μatm) and the eutrophic (3.2 μatm) areas. The riverine mouth areas have the
maximum fluxes (82.0±62.8 mmol/m2a). But there was no significant difference between eutrophic and mesotrophic areas in pCO2 and the flux of CO2. The hydrophyte area, however, has the minimum (−0.58±12.9 mmol/m2a). In respect to CO2 equilibrium, input of the rivers will obviously influence inorganic carbon distribution in the riverine estuary. For example,
the annual mean CO2 flux in Zhihugang River estuary was 19 times of that in Meiliang Bay, although the former is only a part of the latter. The
sites in the body of the lake show a clear seasonal cycle with pCO2 higher than atmospheric equilibrium in winter, and much lower than atmospheric in summer due to CO2 consumption by photosynthesis. The CO2 amount of the net annual evasion that enters the atmosphere is 28.42×104 t/a, of which those from the west littoral zone and the open lake account for 53.8% and 36.7%, respectively.
This research was supported by the Knowledge Innovation Project of Chinese Academy of Sciences (KZCXI-SW-01-15) and (KZCX1-SW-12) |
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| Keywords: | carbon dioxide partial pressure air-water interface carbon flux trophic area river input Taihu Lake |
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