Aerosol variability over East Asia as seen by POLDER space-borne sensors
Aerosol variability over East Asia as seen by POLDER space-borne sensors
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DOI：
10.1029/2010jd014286
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发表时间：
2010-12
影响因子：
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通讯作者：
X. Su;P. Goloub;I. Chiapello;H. Chen;F. Ducos;Zhengqiang Li
中科院分区：
文献类型：
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作者：
X. Su;P. Goloub;I. Chiapello;H. Chen;F. Ducos;Zhengqiang Li
[1] 本文致力于基于 PARASOL/POLDER-3 陆地气溶胶产品来分析东亚地区的气溶胶分布和变异性。我们首先将 POLDER-3 气溶胶光学深度 (AOD) 与根据 14 个站点的 AERONET（气溶胶机器人网络）反演计算得出的精细模式 AOD（颗粒半径 ≤ 0.30 μm）进行了比较。在陆地上观察到的相当好的相关性（R ≈ 0.92）表明 POLDER-3 反演对较小部分的细颗粒（主要来自人为来源）具有显着的敏感性。我们利用4年的POLDER-3 2级数据（2005年3月至2009年2月）分析了东亚地区气溶胶分布的特征和季节变化。我们的研究表明，从 POLDER-3 检索到的东亚细模气溶胶的空间分布与人类活动高度相关。我们的工作还证明了季节性精细模式 AOD 模式随地理位置的强烈变化。最后，分析了2003-2009年华北地区特别是北京市地区夏季精细模式AOD的年际变化，为评估2008年夏季奥运会期间北京强制减排的区域影响做出了贡献。我们发现，2003年、2007年和2008年夏季细模AOD平均值相对较高。月平均AOD（6-8月）的年际变化规律表明，6月总体变化最强，变化与7月相似，但与8月不同。作为参考点，还讨论了北京地区夏季测量的总 AOD 和根据 AERONET 反演计算的精细模式 AOD。
[1] This paper is devoted to analysis of aerosol distribution and variability over East Asia based on PARASOL/POLDER-3 aerosol products over land. We first compared POLDER-3 Aerosol Optical Depth (AOD) with fine mode AOD (particles radius ≤ 0.30 μm) computed from AERONET (Aerosol Robotic Network) inversions over 14 sites. The rather good correlation (R ≈ 0.92) observed over land demonstrates the remarkable sensitivity of POLDER-3 retrievals to the smaller fraction of fine particles, mostly originating from anthropogenic sources. We analyzed the characteristics and seasonal variation of aerosol distribution over East Asia by considering 4 years of POLDER-3 Level 2 data (March 2005 to February 2009). Our study shows that the spatial distribution of fine-mode aerosols over East Asia, as retrieved from POLDER-3, is highly associated with human activities. Our work also evidenced a strong variability of seasonal fine-mode AOD patterns with geographical locations. Finally, the interannual variation during 2003–2009 periods of summer fine-mode AOD over North China, in particular the Beijing City region, was analyzed for the contribution to evaluating the regional impact of emission reduction enforced in Beijing during the 2008 Olympic Summer Games. We found that the summer average of fine-mode AOD exhibited relatively higher values in 2003, 2007, and 2008. The interannual variation patterns of monthly averaged AOD (June to August) shows that June generally exhibits the strongest variation and varies similarly to July, but differs from August. As a reference point, measured total AOD and fine-mode AOD computed from AERONET inversions in summer are also discussed for the Beijing City region.