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Spectral Variations of AOD and Its Validation Using MODIS: First Cut Results from Kannur, India

Atmospheric and Climate Sciences 2012年第1期2卷 94-100页

作者： K. M. Praseed T. nishanth M. K. Satheesh Kumar 不详

The properties of aerosols present in the atmosphere are often influenced by the environment in which they are being disbursed. Subsequently, the variation in the environmental conditions may severely affect the aerosol size and distribution. Thus it is quite exciting to investigate the spatial and temporal variations of AOD that are being affected by the significant changes in the environment to a large extent. This paper presents preliminary observations of diurnal variation of Aerosol Optical Depth (AOD) over two distinct locations in Kannur, India. The AOD over a location which has strong marine influence shows the presence of coarse particles while that on a valley of Western Ghats reveals the combined influences of both land and the ocean. The correlation between AOD measured from the ground and that retrieved from MODIS is fairly good. The AODs retrieved from ground based observation is validated with that estimated from MODIS in the context of meteorological parameters observed during the period of this observation.

关键词： Aerosol MICROTOP MODIS Meteorological Parameters Kannur

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Correlative Study between UV Irradiance and TOC Using AURA OMI at Kannur (12.3N, 75.4E)

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Atmospheric and Climate Sciences 2011年第2期1卷 55-60页

作者： nishanth T. Sheela M. Joseph Praseed K. M. M. K. Satheesh Kumar 不详

The solar UV radiation has prominent impacts on human life, animals and plants with positive and negative effects. Atmospheric ozone, which is formed from the photodissociation of molecular oxygen mainly in the stratosphere, absorbs a significant factor of solar UV radiation. The ozone in the stratosphere acts as a protective layer to prevent UV radiation reaching on the surface of the earth. Hence the intensity of solar UV radiation on the surface has a strong dependence on the Total Ozone Column (TOC). The UV irradiance on earth surface depends on geometrical factors such as solar zenith angle, altitude, latitude and other atmospheric parameters as well. This is an attempt to study the variation of solar UV flux at its four discrete wavelengths ranging from 305 - 380 nm at Kannur, which is located in the north of Kerala in India. Hence such a correlation of TOC and UV irradiance is relevant to realize the radiation budget at this location (12.3N, 75.4E) using AURA OMI data. This paper reveals the correlation of day to day, month to month temporal variation of total ozone column (in DU) and UV irradiance (w/m2). From the analysis, the anti-correlation between UV and TOC is revealed and its impact in the solar radiation budget is established.

关键词： UV Irradiance Aura OMI Total Ozone Column Sun Burn

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Analysis of Long Term Variation of the Total Column and Tropospheric Ozone over the Indian Region

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Atmospheric and Climate Sciences 2021年第1期11卷 194-213页

作者： C. T. Resmi T. nishanth P. S. Vijoy M. K. Satheesh Kumar M. Balachandramohan Department of Physics Erode Arts and Science College Tamil Nadu India Department of Physics Sree Krishna College Guruvayur Kerala India Department of Atomic and Molecular Physics Manipal Academy of Higher Education Karnataka India

Ozone plays a significant part in regulating climate change and the chemical characteristics of the atmosphere. Changes in atmospheric ozone can be studied in more detail using ground-based and satellite-based instruments. Studies on the long-term global changes in total column ozone have begun more than three-decade ago using satellite data. The main objective of this work is to analyze the Total Column Ozone (TCO) variations, and tropo-spheric ozone variations over different twenty locations in the Indian sub-continent by using Total Ozone Mapping Spectrometer (TOMS) and AURA OMI/MLS data. The long-term analysis of total column ozone is divided into two phases (1979-1994 and 2005-2018), and tropospheric ozone for one phase (2005-2018) in order to detect changes in the ozone trend pattern. The results of linear regression analysis show a declining trend of total column ozone, and an increasing trend of tropospheric ozone over the selected locations. The impact of wind pattern on the variation of ozone has been analyzed by using NCEP reanalysis data, and found that wind patterns played a prominent role in spatial and temporal changes in total and tropospheric ozone distribution over the subcontinent. Latitudinal variation of total column ozone from Nagarcoil to Anantanag has also been studied for the years 1979, 1994, 2005, and 2018, which indicates an increase in ozone concentration with latitude.

关键词： Ozone Indian Sub-Continent Seasonal Variation Satellite Data Wind Profile

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