气象2012，Vol.38Issue(8)：943-949,7.
长江三角洲地区近30年非雾天能见度特征分析
Analysis of the Visibility Change in the Yangtze River Delta Region in Recent 30 Years
摘要
Abstract
The visibility change was analyzed with the observations from ground stations and the aerosol optical depth （AOD） data from Moderate-resolution Imaging Spectroradiometer （MODIS） in the Yangtze River Delta region in recent 30 years. It shows that the annual mean visibility was 19.5 ±1.8 km during 1980--2009 with a maximum value of 21.9 km in 1984 and a minimum value of 16.1 km in 2007. The visi- bility has a downward trend in recent 30 years at a rate of -0.20±0. 013 km/a and tends to become stable in the last few years. The visibility changes with the seasons in this region which is the highest in summer, followed by autumn and spring and the lowest in winter; the visibility in the coastal areas is higher than that in inland, and it is lower along the rivers; the decreasing rate along the rivers and the coast areas is higher, especially in the southeastern Zhejiang. The EOF method was used to analyze the visibility of the Yangtze River Delta region. The result shows that the eigenvectors of the first mode are all positive, indi- cating the decreasing trend of the visibility in the whole region. The analysis on the regional and long-term visibility change made by the MODIS AOD data coincides with that by the ground station observations.关键词
能见度/气溶胶光学厚度（AOD）/经验正交函数（EOF）/长江三角洲地区Key words
visibility/aerosol optical depth (AOD)/empirical orthogonal function (EOF)/the YangtzeRiver Delta region分类
资源环境引用本文复制引用
张恩红,朱彬,曹云昌,王红磊..长江三角洲地区近30年非雾天能见度特征分析[J].气象,2012,38(8):943-949,7.基金项目
“973”项目（2009CB426313）、国家自然科学基金重点项目（41030962）、教育部博士点基金（20093228110003）及江苏省高校“青蓝工程”和江苏省优势学科建设工程（PAPD）共同资助 （）
