引用本文:汪 巍,刘 冰,李健军,王瑞斌,等.青藏高原高寒草甸地区大气CO2浓度变化特征[J].环境科学研究,2015,28(4):503-508.
WANG Wei,LIU Bing,LI Jianjun,WANG Ruibin,et al.Characteristics of Atmospheric CO2 Variations in an Alpine Meadow Region on the Tibetan Plateau[J].Reserrch of Environmental Science,2015,28(4):503-508.]
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青藏高原高寒草甸地区大气CO2浓度变化特征
汪 巍, 刘 冰, 李健军, 王瑞斌
中国环境监测总站, 国家环境保护环境监测质量控制重点实验室, 北京 100012
摘要:
大气CO2浓度的长期连续观测是研究全球和区域碳循环过程及其气候和环境效应的重要基础. 利用基于非色散红外吸收光谱法(NDIR)的大气CO2在线观测系统,于2012年3月—2013年2月在青海门源大气背景站对青藏高原高寒草甸地区大气φ(CO2)进行了连续观测. 结果表明:①观测期间,门源站大气φ(CO2)波动较大,其背景值出现频率为59%,背景值平均为391.2×10-6,低于2012年全球平均值(393.1×10-6);受排放源和吸收汇影响的φ(CO2)非背景值出现频率分别为25%和16%,二者平均值分别为401.1×10-6和380.7×10-6. ②夏季φ(CO2)日变幅最大,达到28.9×10-6;春季、夏季、秋季、冬季φ(CO2)最高值分别出现在08:00、07:00、08:00和11:00,最低值均出现在16:00. ③门源站φ(CO2)背景值季节变化明显,最高值出现在1月,月均值为397.7×10-6;最低值出现在8月,月均值为381.0×10-6. ④不同季节φ(CO2)-风玫瑰图分析结果显示,春季、夏季、秋季φ(CO2)高值主要出现在W-NW-N扇区,冬季高值主要出现在SE-S-SW扇区. 门源站大气φ(CO2)的季节变化特征主要是排放源、吸收汇以及地面风共同作用的结果.
关键词:  青藏高原  高寒草甸  CO2  背景浓度  地面风
DOI:
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基金项目:中国科学院战略先导科技专项(B)(XDB05030205)
Characteristics of Atmospheric CO2 Variations in an Alpine Meadow Region on the Tibetan Plateau
WANG Wei, LIU Bing, LI Jianjun, WANG Ruibin
State Environmental Protection Key Laboratory of Quality Control in Environmental Monitoring, China National Environmental Monitoring Center, Beijing 100012, China
Abstract:
Abstract:Continuous online measurement of atmospheric CO2 is an important foundation for research on global and regional carbon cycles as well as their climatic and environmental effects. From March 2012 to February 2013, atmospheric CO2 concentrations were measured continuously at Menyuan Atmospheric Background Station with a non-dispersive infrared absorption spectrometer system. This is the first time such measurements have been made in an alpine meadow region on the Tibetan Plateau. The analysis results showed that:1) The CO2 time series showed remarkable fluctuations. Approximately 59% of observed values were filtered as background data. The average value of CO2 background concentration was 391.2×10-6, which was lower than the global average in the year 2012 (393.1×10-6). 25% and 16% of observed values were filtered as non-background data, being influenced by sources and sinks, with average values of CO2 non-background concentrations of 401.1×10-6 and 380.7×10-6, respectively. 2) The highest variation amplitude of hourly concentration in a day reached 28.9×10-6 in the summer. The highest hourly average concentration was observed at 08:00,7:00, 08:00 and 11:00 in the spring, summer, autumn and winter, respectively, with the lowest hourly average concentration observed at 16:00 in all the seasons. 3) The atmospheric CO2 concentrations in Menyuan clearly varied seasonally, with the maximum value of 397.7×10-6 in January and the minimum value of 381.0×10-6 in August. 4) Higher measured CO2 concentrations were associated with winds from the W-NW-N direction in the spring, summer and autumn, while from the SE-S-SW direction in the winter. The seasonal variation characteristics of CO2 concentrations in Menyuan were due to the combined impacts of of the seasonal variation of sources and sinks, as well as the surface wind.
Key words:  Tibetan Plateau  alpine meadow ecosystem  CO2  background concentration  surface wind