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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

汪 巍, 刘 冰, 李健军, 王瑞斌. 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.
引用本文: 汪 巍, 刘 冰, 李健军, 王瑞斌. 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. Characteristics of Atmospheric CO2 Variations in an Alpine Meadow Region on the Tibetan Plateau[J]. Research of Environmental Sciences, 2015, 28(4): 503-508.
Citation: WANG Wei, LIU Bing, LI Jianjun, WANG Ruibin. Characteristics of Atmospheric CO2 Variations in an Alpine Meadow Region on the Tibetan Plateau[J]. Research of Environmental Sciences, 2015, 28(4): 503-508.

青藏高原高寒草甸地区大气CO2浓度变化特征

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

  • 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.

     

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