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

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

周杰,
官莉

南京信息工程大学气象灾害预报预警与评估协同创新中心, 中国气象局气溶胶-云-降水重点开放实验室, 南京 210044

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
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- 被引次数: 0
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

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

Jie ZHOU,
Li GUAN

Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044

Funds:

National Natural Science Foundation of China 41575029

摘要

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。
- 甲烷 /
- 大气红外探测仪(AIRS) /
- 青藏高原 /
- 时空分布 /
- 季风指数
Abstract: Observations of global methane inversion (CH₄) products measured middle-upper by the Atmospheric Infrared Sounder (AIRS) on the Aqua satellite and the NCEP reanalysis data are used to investigate characteristic changes in CH₄ over the Tibetan Plateau from 2003 to 2014. The relationship between the CH₄ change and the monsoon is explored. The results indicate that, taking the Tibetan Plateau as whole, the concentration of CH₄ decreases with the increase in altitude. The seasonal variation of CH₄ in the middle-upper troposphere is significant. Monthly average concentration of CH₄ is the highest from July to September, followed by that in June and October, and the value is low in other months. The concentration of CH₄ increased year by year during 2003-2014, showing an overall increasing trend with an annual growth rate of about 4.66ppb (10^-9). Based on analysis of the spatial distribution of CH₄ over the plateau, the concentration of CH₄ is higher in the north than in the south of the plateau. During the summer monsoon period, CH₄ concentration in the mid-upper troposphere significantly increases and continues to accumulate due to strong convective transport and influences of South Asia high blocking over the plateau. The maximum CH₄ concentration appears at the end of August to early September. Analysis of the monsoon index suggests that strong convection under the influence of summer monsoon is one of the major factors contributing to the high value of CH₄ over the Tibetan Plateau. The maximum CH₄ concentration appears about one month later than the Monsoon Index. With the decline of the monsoon, the high value of CH₄ also quickly decreases.
- Methane /
- Atmospheric infrared sounder (AIRS) /
- Tibetan Plateau /
- Spatial and temporal distribution /
- Monsoon index

HTML全文

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

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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

下载: 全尺寸图片幻灯片

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)

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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

下载: 全尺寸图片幻灯片

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

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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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