Scanning Imaging Absorption Spectrometer for Atmospheric Cartography（SCIAMACHY） limb observation data are used to retrieve stratospheric aerosol extinction profiles. The retrieved aerosol profiles are compared with ...Scanning Imaging Absorption Spectrometer for Atmospheric Cartography（SCIAMACHY） limb observation data are used to retrieve stratospheric aerosol extinction profiles. The retrieved aerosol profiles are compared with Stratospheric Aerosol and Gas Experiment（SAGE） Ⅱ aerosol data records. The comparisons are made over the period 2003–2004. The results show that the SCIAMACHY aerosol profile retrievals exhibit general agreement with the coincident SAGE Ⅱ data records. In the 15–35 km altitude range, the percentage differences between the SCIAMACHY-retrieved and SAGE Ⅱ–measured zonal mean aerosol extinction profiles are less than 20% for the 20–30°N and 30–40°N latitude zones, and less than 25% for the 40–50°N zone. The stratospheric aerosol optical depths in this altitude range calculated from SCIAMACHY retrievals are in good agreement with SAGE Ⅱ measurements, with present differences less than 6% for the three latitude zones. The aerosol retrievals from SCIAMACHY observations are combined with the SAGE Ⅱ aerosol data records, form a long-term data-set for the period 2000–2010. Using the combined SAGE Ⅱ and SCIAMACHY dataset, the variation trends of the stratospheric aerosol layer over East Asia（20–50°N, 70–150°E） are analyzed. The results indicate that the stratospheric aerosols have a significant trend of increase over East Asia during 2000–2010. The stratospheric aerosol optical depths increase by about 5% per year over the 11-yr period. The increase in stratospheric aerosols is found to be obviously related to moderate volcanic eruptions.展开更多
利用长达20年的SAGEⅡ(stratospheric aerosol and gasexperimentⅡ)资料,研究了东亚地区5.0～15.0km高空气溶胶多年时空分布特征和变化趋势,并研究了东亚沙尘活动对高空及下游的气溶胶输送。发现东亚高空气溶胶水平分布呈现上中下3层...利用长达20年的SAGEⅡ(stratospheric aerosol and gasexperimentⅡ)资料,研究了东亚地区5.0～15.0km高空气溶胶多年时空分布特征和变化趋势,并研究了东亚沙尘活动对高空及下游的气溶胶输送。发现东亚高空气溶胶水平分布呈现上中下3层不同的分布特征,下层5.0～8.5km高值区对应气溶胶源区青藏高原和西北沙漠地区;中层9.0～10.0km高值区对应温带气旋高发的中纬度地区;上层10.5～15.0km表现为低纬气溶胶含量显著高于高纬地区。高空各层气溶胶的空间分布受天气系统的影响具有明显的季节变化。近10年来东亚高空气溶胶呈减少趋势,平均光学厚度约下降了0.016。另外还发现沙尘活动与5.0～11.5km范围内的气溶胶显著相关,反映沙尘活动影响的高度范围可以达到整个对流层。定义沙尘暴高空影响指数,用来分析东亚沙尘暴对下游地区的影响,发现随着时间推移沙尘逐渐向东移动,在约12天之后可以到达大西洋。展开更多
基金funded by the National Natural Science Foundation of China[grant number 41275047],[grant number41675032],[grant number 41575034]
文摘Scanning Imaging Absorption Spectrometer for Atmospheric Cartography（SCIAMACHY） limb observation data are used to retrieve stratospheric aerosol extinction profiles. The retrieved aerosol profiles are compared with Stratospheric Aerosol and Gas Experiment（SAGE） Ⅱ aerosol data records. The comparisons are made over the period 2003–2004. The results show that the SCIAMACHY aerosol profile retrievals exhibit general agreement with the coincident SAGE Ⅱ data records. In the 15–35 km altitude range, the percentage differences between the SCIAMACHY-retrieved and SAGE Ⅱ–measured zonal mean aerosol extinction profiles are less than 20% for the 20–30°N and 30–40°N latitude zones, and less than 25% for the 40–50°N zone. The stratospheric aerosol optical depths in this altitude range calculated from SCIAMACHY retrievals are in good agreement with SAGE Ⅱ measurements, with present differences less than 6% for the three latitude zones. The aerosol retrievals from SCIAMACHY observations are combined with the SAGE Ⅱ aerosol data records, form a long-term data-set for the period 2000–2010. Using the combined SAGE Ⅱ and SCIAMACHY dataset, the variation trends of the stratospheric aerosol layer over East Asia（20–50°N, 70–150°E） are analyzed. The results indicate that the stratospheric aerosols have a significant trend of increase over East Asia during 2000–2010. The stratospheric aerosol optical depths increase by about 5% per year over the 11-yr period. The increase in stratospheric aerosols is found to be obviously related to moderate volcanic eruptions.
文摘利用长达20年的SAGEⅡ(stratospheric aerosol and gasexperimentⅡ)资料,研究了东亚地区5.0～15.0km高空气溶胶多年时空分布特征和变化趋势,并研究了东亚沙尘活动对高空及下游的气溶胶输送。发现东亚高空气溶胶水平分布呈现上中下3层不同的分布特征,下层5.0～8.5km高值区对应气溶胶源区青藏高原和西北沙漠地区;中层9.0～10.0km高值区对应温带气旋高发的中纬度地区;上层10.5～15.0km表现为低纬气溶胶含量显著高于高纬地区。高空各层气溶胶的空间分布受天气系统的影响具有明显的季节变化。近10年来东亚高空气溶胶呈减少趋势,平均光学厚度约下降了0.016。另外还发现沙尘活动与5.0～11.5km范围内的气溶胶显著相关,反映沙尘活动影响的高度范围可以达到整个对流层。定义沙尘暴高空影响指数,用来分析东亚沙尘暴对下游地区的影响,发现随着时间推移沙尘逐渐向东移动,在约12天之后可以到达大西洋。
