Study on the concentration variation of CO2 in the background area of Xisha
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摘要: CO2是引起全球气候变暖的最重要温室气体。大气中过量CO2被海水吸收后将改变海水中碳酸盐体系的组成,造成海水酸化,危害海洋生态环境。本文采用局部近似回归法对2013年12月—2014年11月期间西沙海洋大气CO2浓度连续监测数据进行筛分,得到西沙大气CO2区域本底浓度。结果表明,西沙大气CO2区域浓度具有明显的日变化和季节变化特征。4个季节西沙大气CO2区域本底浓度日变化均表现为白天低、夜晚高,最高值405.39×10-6 (体积比),最低值399.12×10-6(体积比)。西沙大气CO2区域本底浓度季节变化特征表现为春季和冬季高,夏季和秋季低。CO2月平均浓度最高值出现在2013年12月,为406.22×10-6 (体积比),最低值出现在2014年9月,为398.68×10-6 (体积比)。西沙大气CO2区域本底浓度日变化主要受本区域日照和温度控制。季节变化主要控制因素是南海季风和大气环流,南海尤其是北部海域初级生产力变化和海洋对大气CO2的源/汇调节作用。Abstract: CO2 is the most important greenhouse gases that cause global warming. After the sea absorb excess CO2, the composition of carbonate system changes. Consequently, the pH of the seawater will reduce and damage the marine ecological environment. The atmospheric carbon dioxide (CO2) was observed at Xisha in the South China Sea from December 2013 to November 2014. A mathematical procedure based on robust local regression was applied to distinguish background and non-background concentration. The CO2 background concentration shows large diurnal and seasonal variations. The CO2 concentration shows lower during daytime and higher during nighttime in four seasons. The maximum is 405.39×10-6 (V/V) and minimum is 399.12×10-6(V/V). The CO2 seasonal cycle shows higher in spring and winter, lower in summer and autumn. The monthly maximum appears in November 2013 (i.e., 406.22×10-6 (V/V)) and the minimum appears in September 2014 . The diurnal variation of background concentration is mainly affected by sunlight and temperature in the region. And the seasonal variation is controlled by monsoon, atmospheric circulation, photosynthesis, and source or sink of the sea to air.
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Key words:
- Xisha /
- South China Sea /
- atmospheric CO2 /
- the background concentration
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Dlugokencky E, Tans P P, 2014: Recent CO2, NOAA, ESRS, available online at www.esrl. noaa.gov/gmd/ccgg/trends/global.html. 2013: Globally averaged marine surface annual mean data, NOAA/ESRL (www.esrl.noaa.gov/gmd/ccgg/trends/). Prather M J, Holmes C D, Hsu J. Reactive greenhouse gas scenarios: Systematic exploration of uncertainties and the role of atmospheric chemistry[J]. Geophysical Research Letters, 2012, 39(9): L09803. Joos F, Roth R, Fuglestvedt J S, et al. Carbon dioxide and climate impulse response functions for the computation of greenhouse gas metrics: a multi-model analysis[J]. Atmospheric Chemistry and Physics, 2013, 13(2793): 2793-2825. Sabine C L, Feely R A, Gruber N, et al. The oceanic sink for anthropogenic CO2[J]. Science, 2004, 305(5682): 367-371. Hansell D A, Craig A C, Daniel J R, et al. Dissolved organic matter in the ocean: a controversy stimulates new insights[J]. Oceanography, 2009, 22(4): 202-211. Riehesell U. Effects of CO2 enrichment on marine phytoplankton[J]. Journal of Oceanography, 2004, 60(4): 719-729. Keeling C D. Atmospheric carbon dioxide variations at Mauna Loa observatory, Hawaii[J]. Tellus, 1976, 28(6): 538-551. Conway T J, Tans P P, Waterman L S, et al. Evidence for interannual variability of the carbon cycle from the NOAA/CMDL global air sampling network[J]. Journal of Geophysical Research, 1994, 99(D11): 22831-22855. Alison C E. δ 13C of atmospheric CO2 at Cape Grim: the in situ record, the flask record, air standards and the CG92 calibration scale[M]//Dick A L, Bouma W, Derek N. Baseline Atmospheric Program (Australia) 1996. Victoria: Bureau of Meteorology and CSIRO Division of Atmospheric Research, Melbourne, 1999: 45-56. World Meteorological Organization. 12th WMO/IAEA Meeting of experts on carbon dioxide concentration and related tracers measurement techniques[R]. Vienna: WMO GAW Report No.161, 2005. 周凌稀, 张晓春, 郝庆菊, 等. 温室气体本底观测研究[J]. 气候变化研究进展, 2006, 2(2): 63-67. Zhou Lingxi, Zhang Xiaochun, Hao Qingju, et al. Study of the background greenhouse gas observation[J]. Advances in Climate Change Research, 2006, 2(2): 63-67. 周凌晞, 刘立新, 张晓春, 等. 我国温室气体本底浓度网络化观测的初步结果[J]. 应用气象学报, 2008, 19(6): 641-645. Zhou Lingxi, Liu Lixin, Zhang Xiaochun, et al. Preliminary results on network observation of greenhouse gases at china GAW stations[J]. Journal of Applied Meteorological Science, 2008, 19(6): 641-645. 刘立新, 周凌晞, 张晓春, 等. 我国4个国家级本底站大气CO2浓度变化特征[J]. 中国科学D辑: 地球科学, 2009, 39(2): 222-228. Liu Lixin, Zhou Lingxi, Zhang Xiaochun, et al. The characteristics of atmospheric CO2 concentration variation of four national background stations in China[J]. Science China Series D: Earth Sciences, 2009, 52(11): 1857-1863. Zhou Lingxi, Conway T J, White J W C, et al. Long-term record of atmospheric CO2 and stable isotopic ratios at Waliguan Observatory: Background features and possible drivers, 1991-2002[J]. Global Biogeochemical Cycles, 2005, 19(3): GB3021. 方双喜, 周凌晞, 臧昆鹏, 等. 光腔衰荡光谱(CRDS)法观测我国4个本底站大气CO2 [J]. 环境科学学报, 2011, 31(3): 624-629. Fang Shangxi, Zhou Lingxi, Zang Kunpeng, et al. Measurement of atmospheric CO2 mixing ratio by cavity ring-down spectroscopy (CRDS) at the 4 background stations in China[J]. Acta Scientiae Circumstantiae, 2011, 31(3): 624-629. World Meteorological Organization. Global Atmosphere Watch[R]. Geneva: WMO, 1993, 86: 1-19. 张芳, 周凌晞, 许林. 瓦里关大气CH4浓度变化及其潜在源区分析[J]. 中国科学: 地球科学, 2013, 43(4): 536-546. Zhang Fang, Zhou Lingxi, Xu Lin. Temporal variation of atmospheric CH4 and the potential source regions at Waliguan, China[J]. Science China: Earth Sciences, 2013, 43(4):536-546. Ruckstuhl A F, Henne S, Reimann S, et al. Robust extraction of baseline signal of atmospheric trace species using local regression[J]. Atmospheric Measurement Techniques, 2012, 5(11): 2613-2624. Ruckstuhl A F, Jacobson M P, Field R W, et al. Baseline subtraction using robust local regression estimation[J]. Journal of Quantitative Spectroscopy & Radiative Transfer, 2001, 68(2): 179-193. 浦静姣, 徐宏辉, 顾骏强, 等. 长江三角洲背景地区CO2浓度变化特征研究[J]. 中国环境科学, 2012, 32(6): 973-979. Pu Jingjiao, Xu Honghui, Gu Junqiang, et al. Study on the concentration variation of CO2 in the background area of Yangtze River Delta[J]. China Environmental Science, 2012, 32(6): 973-979. 张林海, 仝川, 曾从盛. 河口湿地近地面大气CO2浓度日变化和季节变化[J]. 环境科学, 2014, 35(3): 879-884. Zhang Linhai, Gong Chuan, Zeng Congsheng. Diurnal and seasonal variations of surface atmospheric CO2 concentration in the river estuarine marsh[J]. Environmental Science, 2014, 35(3): 879-884. 王慧鹏, 王春明, 项杰, 等. QuikSCAT卫星散射计矢量风检验及南海月平均风场特征分析[J]. 气象科学, 2014, 34(1): 54-59. Wang Huipeng, Wang Chunming, Xiang Jie, et al. Validation of QuikSCAT satellite scatterometer winds and characteristics of monthly mean wind speed in South China Sea[J]. Journal of the Meteorological Sciences, 2014, 34(1): 54-59. 刘铁军, 郑崇伟, 潘静, 等. 中国周边海域海表风场的季节特征、大风频率和极值风速特征分析[J]. 延边大学学报: 自然科学版, 2013, 39(2): 148-152. Liu Tiejun, Zheng Chongwei, Pan Jing, et al. Analysis of seasonal characteristics, gale frequency and extreme wind speed around the China Sea[J]. Journal of Yanbian University: Natural Science, 2013, 39(2): 148-152. 王蓉, 肖瑜璋, 俞胜宾, 等. 南海北部近岸海域风场特征分析与预报研究[J]. 海洋预报, 2011, 28(2): 1-8. Wang Rong, Xiao Yuzhang, Yu Shengbin, et al. Analysis and forecasting of wind field character on the north of South China Sea borders near-ocean area[J]. Marine Forecasts, 2011, 28(2): 1-8. 吕柯伟, 胡建宇, 杨小怡. 南海及邻近海域海面风场季节性变化的空间差异[J]. 热带海洋学报, 2012, 31(6): 41-47. Lv Kewei, Hu Jianyu, Yang Xiaoyi. Spatial patterns in seasonal variability of sea surface wind over the South China Sea and its adjacent ocean[J]. Journal of Tropical Oceanography, 2012, 31(6): 41-47. 郝锵, 宁修仁, 刘诚刚, 等. 南海北部初级生产力遥感反演及其环境调控机制[J]. 海洋学报, 2007, 29(3): 58-68. Hao Qiang, Ning Xiuren, Liu Chenggang, et al. Satellite and in situ observations of primary production in the northern South China Sea[J]. Haiyang Xuebao, 2007, 29(3): 58-68. 翟惟东. 南海北部与珠江河口水域CO2通量及其调控因子[D]. 厦门: 厦门大学, 2003: 41-55. Zhai Weidong. Air-Sea Fluxes of Carbon Dioxide and Upper Ocean Biogeochemical Processes in the Northern South China Sea and the Pearl River Estuary[D]. Xiamen: Xiamen University, 2003: 41-55. Zhai Weidong, Dai Minhan, Cai Weijun, et al. The partial pressure of carbon dioxide and air-sea fluxes in the northern South China Sea in spring, summer and autumn[J]. Marine Chemistry, 2005, 96(1/2): 87-97. Dai Minhan, Zhai Weidong, Cai Weijun, et al. Effects of an estuarine plume-associated bloom on the carbonate system in the lower reaches of the Pearl River estuary and the coastal zone of the northern South China Sea[J]. Continental Shelf Research, 2008, 28(12): 1416-1423. Zhai Weidong, Dai Minhan, Chen B S, et al. Seasonal variations of sea-air CO2 fluxes in the largest tropical marginal sea (South China Sea) based on multiple-year underway measurements[J]. Biogeosciences, 2013, 10(11): 7775-7791.
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