Vertical distribution of the Asian tropopause aerosols detected by CALIPSO.
Vertical distribution of the Asian tropopause aerosols detected by CALIPSO.
复制标题
用CALIPSO探测的亚洲对流层顶气溶胶的垂直分布。
DOI：
10.1016/j.envpol.2019.06.111
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发表时间：
2019-10
影响因子：
8.9
通讯作者：
H. Niu;Shi-chang Kang;W. Gao;Yuhang Wang;Rukumesh Paudyal
中科院分区：
文献类型：
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作者：
H. Niu;Shi-chang Kang;W. Gao;Yuhang Wang;Rukumesh Paudyal
表征气溶胶光学特性的垂直分布对于减少量化气溶胶辐射强迫和气候影响的不确定性至关重要。对四年（2007-2010）云气溶胶激光雷达和红外探路者卫星观测（CALIPSO）激光雷达测量结果的分析揭示了与亚洲夏季季风相关的对流层气溶胶层的存在。利用五种典型气溶胶光学和微物理参数的测量来探索南亚地区对流层顶气溶胶的性质、空间/垂直分布和年演化。从532和1064nm气溶胶消光系数、532nm后向散射系数和532nm退偏振比等不同纬度-高度和经度-高度截面提取的结果表明，季风季节，北阿拉伯海、印度、北孟加拉湾和赤道印度洋上空有大量气溶胶垂直延伸至对流层顶（12km），最终到达对流层顶（12km）。青藏高原东南部。与亚洲夏季风相关的对流输送是控制对流层顶气溶胶垂直分布的重要因素。 532nm处气溶胶散射比的演变表明，从赤道印度洋到南亚，季风季节存在气溶胶层向上倾斜和上升的结构，这典型地表明亚洲季风区气溶胶增强。为了更好地了解该气溶胶层的性质和起源，需要有关气溶胶尺寸分布和详细成分的信息。在未来评估区域或全球气候系统的研究中应考虑对流层顶气溶胶的增强。还迫切需要对气溶胶进行进一步的卫星观测和现场观测来诊断该气溶胶层，该气溶胶层可能源自人为排放。
Characterizing the vertical distribution of aerosol optical properties is crucial to reduce the uncertainty in quantifying the radiative forcing and climate effects of aerosols. The analysis of four-year (2007–2010) Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) lidar measurements revealed the existence of tropospheric aerosol layers associated with the Asian summer monsoon. The measurements of five typical aerosol optical and microphysical parameters were used to explore the properties, spatial/vertical distributions, annual evolution of tropopause aerosols over the South Asia region. Results extracted from various latitude-height and longitude-height cross sections of aerosol extinction coefficient at 532 and 1064 nm, backscatter coefficient at 532 nm, and depolarization ratio at 532 nm demonstrated that a large amount of aerosols vertically extended up to the tropopause (12 km) during the monsoon season over the north Arabian Sea, India, north Bay of Bengal, and equatorial Indian Ocean, finally reaching the southeast of the Tibetan Plateau. Convective transport associated with Asian summer monsoon is an important factor controlling the vertical distribution of tropopause aerosols. The evolution of aerosol scattering ratio at 532 nm indicated that from equatorial Indian Ocean to South Asia, there exists an upward tilting and ascending structure of the aerosols layer during the monsoon season, which typically indicates enhanced aerosols over the Asian monsoon region. Information on aerosol size distribution and detailed composition are needed for better understanding the nature and origin of this aerosol layer. Enhancement of the tropopause aerosols should be considered in the future studies in evaluating the regional or global climate systems. Further satellite observations of aerosols and in-situ observations are also urgently needed to diagnose this aerosol layer, which likely originate from anthropogenic emissions.