ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 38 Issue 8 > 2012,38(8):943-949. DOI:10.7519/j.issn.1000-0526.2012.08.006 Prev Next
Analysis of the Visibility Change in the Yangtze River Delta Region in Recent 30 Years
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
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 visibility 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, indicating 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.
Keywords:
Project Supported:
Clc Number:
Mobile website
