基于CALIOP和MODIS数据的气溶胶时空分布特征对比分析

大气与环境光学学报 ›› 2017, Vol. 12 ›› Issue (3): 210-220.

基于CALIOP和MODIS数据的气溶胶时空分布特征对比分析

曾昭亮1，2，郭建平2*，马大喜1 ，刘洪利2，吴文正1，桂柯3，娄梦筠2

（1.江西理工大学建筑与测绘工程学院，江西赣州 341000；
2.中国气象科学研究院灾害天气国家重点实验室，北京100081;
3.成都信息工程学院大气科学学院，高原大气与环境四川省重点实验室，四川成都 610225）

收稿日期:2016-10-09 修回日期:2016-11-01 出版日期:2017-05-28 发布日期:2017-05-18
作者简介: 曾昭亮（1992-），男，江西吉安人，研究生，主要从事大地测量学与测绘工程、大气气溶胶遥感、激光雷达数据处理等方面的研究。
基金资助:
Supported by the 973 Program and National Pillar Program of the Ministry of Science and Technology（国家科技部973支撑项目，2016YFC0203306),12th Five-year Pillar Program Ministry of Science and Technology（国家科技部十二五科技支撑项目 2014BAC16B01）, Key Project of National Natural Science Foundation of China (国家自然科学基金重点项目，91544217), General Project of National Natural Science Foundation of China (国家自然科学基金面上项目，41471301)

Spatio-Temporal Variation of Aerosol Optical Depth from CALIOP and MODIS Data and Their Intercomparison

ZENG Zhaoliang1，2, GUO Jianping2*, MA Daxi1, LIU Hongli2, WU Wenzheng1, GUI Ke3, LOU Mengyun2

(1.School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2.State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;
3.College of Atmospheric Sciences, Chengdu University of Information Technology, Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225, China )

Received:2016-10-09 Revised:2016-11-01 Published:2017-05-28 Online:2017-05-18

摘要/Abstract

摘要：

利用两个AERONET站点（Hangzhou_ZFU、SACOL）的Level 2 气溶胶光学厚度（aerosol optical depth, AOD）数据对比验证CALIOP Level 2 AOD数据。结果表明：Hangzhou_ZFU、SACOL站的相关系数为0.87、0.85，回归方程的斜率为0.76、0.92，这表明CALIOP AOD与AERONET AOD显著相关，在这两个站点及附近区域具有适应性。基于2008~2015年无云条件下的CALIOP Level 3月气溶胶产品和同期的MODIS Terra/Aqua Level 3月气溶胶产品，对比分析中国东南和西北区域气溶胶光学厚度（aerosol optical depth, AOD）时空分布特征。分析表明：中国东南区域AOD季节与空间变化明显，AOD高值主要分布在长三角、珠三角等地，且夏季最高、春季次之，秋冬季相当。MODIS AOD月均值保持在在0.25~0.8之间，且与CALIOP 夜间AOD值接近，但与CALIOP白天AOD值差异较大，最大相差值可达0.45。中国西北区域两种卫星获取的AOD值空间分布非常相似，其高值区都位于塔里木盆地、准格尔盆地和柴达木盆地；AOD值春季最高，夏季减少、冬季次之、秋季最低；MODIS AOD值波动显著且普遍高于CALIOP AOD值。

关键词: CALIOP AOD, MODIS AOD, 时空变化, AOD月均值

Abstract:

Combining CALIOP aerosol optical depth (AOD) products and coincident AODs at two AERONET sites (i.e., Hangzhou_ZFU and SACOL), CALIOP Level 2 column AOD against AERONET AOD is validated. Intercomparison analyses show that the correlation coefficient between AOD at Hangzhou_ZFU (SACOL) and CALIPSO-derived AOD reaches as high as 0.87 (0.85), and the slope of the regression equation is 0.76 (0.92), indicating that CALIOP AOD is better enough to be applied to characterize the regional air pollution. Based on concurrent CALIOP level 3 monthly mean gridded AOD products (daytime and nighttime) and the MODIS Terra/Aqua level 3 monthly mean AOD dataset of the 8 years (2008~2015), the spatial and temporal variations of AOD over Southeast China and Northwest China are analyzed. Results show that Southeast China exhibits a significant seasonal and spatial variability. High AOD values are largely located in Yangtze River Delta and Pearl River Delta. The highest AOD occurs in spring, followed by summer, and then winter and autumn. In terms of monthly average AOD, MODIS tends to overestimate AOD compared with AERONET, ranging from 0.25 to 0.8. CALIOP AOD during night is commensurate with MODIS AOD. By comparison, much difference exists between the daytime CALIPSO AOD and MODIS AOD, which is as high as 0.45. Results from both MODIS and CALIPSO AODs suggest that the spatial distribution of AOD is very similar. To be more specific, the high AOD value is largely located in the Tarim Basin, Junggar Basin and Qaidam Basin. Meanwhile, the highest AOD value occurs in the spring, followed by summer, then winter and autumn. Overall, MODIS AOD values fluctuate significantly and are generally higher than CALIOP AOD values.

Key words: CALIOP AOD, MODIS AOD, spatio-emporal variation, monthly mean AOD

中图分类号:

曾昭亮郭建平马大喜刘洪利吴文正桂柯娄梦筠. 基于CALIOP和MODIS数据的气溶胶时空分布特征对比分析[J]. 大气与环境光学学报, 2017, 12(3): 210-220.

ZENG Zhao-Liang, GUO Jian-Beng, MA Da-Xi, LIU Hong-Li, WU Wen-Zheng, GUI Ke, LOU Meng-Jun. Spatio-Temporal Variation of Aerosol Optical Depth from CALIOP and MODIS Data and Their Intercomparison[J]. Journal of Atmospheric and Environmental Optics, 2017, 12(3): 210-220.

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