DOI: 10.1016/j.atmosenv.2015.03.021
Scopus记录号: 2-s2.0-84924902137
论文题名: A study of aerosol optical depth variations over the Indian region using thirteen years (2001-2013) of MODIS and MISR Level 3 data
作者: Mehta M
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 109 起始页码: 161
结束页码: 170
语种: 英语
英文关键词: Aerosol optical depth
; India
; MISR
; MODIS
; Tendencies
; Trends
Scopus关键词: Aerosols
; Atmospheric aerosols
; Atmospheric thermodynamics
; Earth (planet)
; NASA
; Optical properties
; Radiometers
; Satellites
; Aerosol optical depths
; India
; MISR
; MODIS
; Tendencies
; Trends
; Loading
; rain
; aerosol
; anthropogenic effect
; error analysis
; MODIS
; optical depth
; satellite data
; seasonal variation
; urban area
; aerosol
; air pollution
; altitude
; Article
; biomass
; humidity
; India
; industrialization
; moderate resolution imaging spectroradiometer
; multi angle imaging spectroradiometer
; oceanic regions
; optical depth
; priority journal
; satellite imagery
; seasonal variation
; sensor
; time series analysis
; topography
; troposphere
; vegetation
; wind
; winter
; India
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Aerosols affect the earth's climate system both on a regional as well as on a global scale. Several studies have identified India (the second most populous country) as one of the regional hot spots of aerosols due its increasing anthropogenic activities. The paper presents a temporal (annual and seasonal) study of aerosol optical depth (AOD) in the country using satellite data for thirteen year period (2001-2013). The Indian region is divided into four sub regions i.e., north, west, east and south. The analysis is carried out using Level 3 data from two satellite sensors, namely, MODIS (1°×1°) and MISR (0.5°×0.5°), onboard NASA's Terra platform. Annual and seasonal mean AOD variation has been studied. It is found that annual aerosol loading remains highest in Indo-Gangetic Plains (IGP) in all the years. In winter season, the overall loading is lowest for the entire country while it reaches maximum in the monsoon season. This could be attributed to the relative humidity, wind and associated rainfall patterns in the country. Also, the aerosol tendencies have been computed using the first and last six year period change in aerosol optical depth. Further, annual and seasonal trends in AOD have been calculated using weighted least square regression approach and the results have been compared. Statistically significant trends are reported at 95% confidence level. Weights are assigned corresponding to the expected errors associated with the satellite data. There is a good agreement in the seasonal tendencies and trends computed from both the sensors for winter, monsoon and post-monsoon seasons. Significantly increasing trends are found in winter and post-monsoon seasons which could be due to increase in anthropogenic activities. All the observations are separately reported for ten most populous cities of India. Delhi and Kolkata are amongst the most polluted cities in India. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81819
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Photogrammetry and Remote Sensing Department, Indian Institute of Remote Sensing (IIRS), ISRO, Govt. of India, 4-Kalidas Road, Dehradun, India
Recommended Citation:
Mehta M. A study of aerosol optical depth variations over the Indian region using thirteen years (2001-2013) of MODIS and MISR Level 3 data[J]. Atmospheric Environment,2015-01-01,109