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青藏高原上空甲烷的时空分布特征及其夏季高值形成机制分析

周杰 官莉

周杰, 官莉. 青藏高原上空甲烷的时空分布特征及其夏季高值形成机制分析[J]. 气候与环境研究, 2017, 22(3): 315-321. doi: 10.3878/j.issn.1006-9585.2016.16062
引用本文: 周杰, 官莉. 青藏高原上空甲烷的时空分布特征及其夏季高值形成机制分析[J]. 气候与环境研究, 2017, 22(3): 315-321. doi: 10.3878/j.issn.1006-9585.2016.16062
Jie ZHOU, Li GUAN. Characteristics of Spatial and Temporal Distributions of Methane over the Tibetan Plateau and Mechanism Analysis for High Methane Concentration in Summer[J]. Climatic and Environmental Research, 2017, 22(3): 315-321. doi: 10.3878/j.issn.1006-9585.2016.16062
Citation: Jie ZHOU, Li GUAN. Characteristics of Spatial and Temporal Distributions of Methane over the Tibetan Plateau and Mechanism Analysis for High Methane Concentration in Summer[J]. Climatic and Environmental Research, 2017, 22(3): 315-321. doi: 10.3878/j.issn.1006-9585.2016.16062

青藏高原上空甲烷的时空分布特征及其夏季高值形成机制分析

doi: 10.3878/j.issn.1006-9585.2016.16062
基金项目: 

国家自然科学基金项目 41575029

详细信息
    作者简介:

    周杰, 男, 1991年出生, 硕士研究生, 主要从事大气遥感资料应用研究。E-mail: 457858344@qq.com

  • 中图分类号: X831

Characteristics of Spatial and Temporal Distributions of Methane over the Tibetan Plateau and Mechanism Analysis for High Methane Concentration in Summer

Funds: 

National Natural Science Foundation of China 41575029

  • 摘要: 利用搭载在美国Aqua卫星上的大气红外探测仪(AIRS)观测资料反演的全球甲烷(CH4)产品和NCEP再分析资料,分析了2003~2014年青藏高原上空CH4的时空变化特征,探讨了夏季CH4高值变化与季风的关系。研究结果表明:就青藏高原整体而言,CH4浓度随高度增加递减;对流层中高层CH4含量季节变化较为明显,其平均浓度在7~9月处于高值,6月、10月次之,其余月份处于低值。2003~2014年CH4含量呈逐年上升趋势,年增长率约为4.66ppb(10-9)。高原上空CH4空间分布分析显示,高原北部CH4浓度高于南部地区。夏季风期间,随着高原上的强对流输送和上空南亚高压的阻塞,对流层中高层CH4浓度明显增加并不断积累,在8月底至9月初出现最大值。在分析季风指数的基础上发现,夏季季风影响下的强对流输送是高原对流层中高层CH4高值形成的主要原因之一,对流层中高层CH4浓度最大值出现时间较季风指数的峰值滞后约半至一个月,随着夏季风的撤退,CH4浓度高值迅速降低。
  • 图  1  不同季节青藏高原及周边地区300 hPa处CH4平均浓度的空间分布:(a)春季;(b)夏季;(c)秋季;(d)冬季

    Figure  1.  Spatial distributions of averaged CH4 concentration at 300 hPa over the Tibetan Plateau and its surrounding areas in different seasons: (a) Spring; (b) summer; (c) autumn; (d) winter

    图  2  青藏高原对流层中高层CH4平均浓度垂直分布的年变化

    Figure  2.  Annual variation of the vertical distribution of averaged CH4 concentration in the middle and upper troposphere over the Tibetan Plateau

    图  3  2003~2014年青藏高原300 hPa处CH4平均浓度的年际变化(灰色实线为2003~2014趋势,黑色虚线为2003~2010年趋势,黑色点线为2011~2014年趋势)

    Figure  3.  Interannual variations of averaged CH4 concentration at 300 hPa over the Tibetan Plateau from 2003 to 2014 (the grey spot solid line represents the growth trend of CH4 concentration from 2003 to 2014, the black solid line represents the growth trend of CH4 concentration from 2003 to 2010, the black dotted line represents the growth trend of CH4 concentration from 2011 to 2014)

    图  4  青藏高原地区300 hPa上空CH4平均浓度和季风指数的逐月变化

    Figure  4.  Monthly changes in averaged CH4 concentration at 300 hPa over the Tibetan Plateau and monsoon index

    图  5  2008年夏季风撤退期(a)青藏高原上空CH4平均浓度与(b)日季风指数的逐日变化

    Figure  5.  Daily variations of (a) averaged CH4 concentration over the Tibetan Plateau and (b) daily monsoon index during the declining period of the summer monsoon in 2008

    表  1  不同季节青藏高原及周边同纬度地区300 hPa处CH4平均浓度

    Table  1.   Averaged CH4 concentrations at 300 hPa over the Tibetan Plateau and the surrounding area of the same latitude in different seasons

    300 hPa处CH4平均浓度(×10–9
    青藏高原区域 周边同纬度陆地区域
    春季 1784 1789
    夏季 1822 1822
    秋季 1817 1822
    冬季 1787 1797
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-03-24
  • 网络出版日期:  2016-06-15
  • 刊出日期:  2017-05-20

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