Ultraviolet Radiation Measurement in the South of Sinkiang Using a Compact Zenith-sky Spectrometer

[ABSTRACT] Terrestrial levels of solar UV radiation determine the impact on human health. Ozone depletion and associated increases in solar UV radiation reaching the earth’s surface are therefore major environmental issues. The quality (spectrum) and quantity (intensity) of terrestrial UV radiation vary with factors including the elevation of the sun above the horizon and absorption and scattering by molecules in the atmosphere, notably ozone, and by clouds. Here we report the measurement of UV radiation in the south of Sinkiang, the northwest part of China, using a compact zenith-sky spectrometer in summer 2004. The measurement site, as an area of 1090 meters altitude near the planetary boundary layer, has more extreme climatic conditions and air with less anthropogenic pollution. The spectral power distribution and the diurnal variation of ambient UV radiation from 290nm to 380nm were measured during days of clear sky. The zenith-sky spectrometer consists of a small telescope pointing zenith direction with a field of view of 13 mrad, a fibre-coupled compact spectrometer with 0.6 spectral resolution and a CCD detector. A filter ( ZWB3 ) was used to block the light above 400nm to reduce stray light. Due to the high spectral resolution, the stratospheric O3 slant columns were analyzed from the UV spectra by Differential Optical Absorption Spectroscopy methodology at the same time. The compact zenith-sky spectrometer gains in terms of field-operability, mobility and flexibility as well as being a cost-effective alternative to the normal zenith-sky system with expensive spectrometer and CCD detector. Additionally, the vertical profile of temperature, humidity and pressure were measured under 30km height by sounding radio.

https://opac.ll.chiba-u.jp/da/curator/104182/

https://opac.ll.chiba-u.jp/da/curator/104182/BA71319447-10-P118.pdf

Chiba University. Center for Environmental Remote Sensing

千葉大学環境リモートセンシング研究センター

Presentation

BA71319447

Proceedings of the CEReS international symposium = CEReS国際シンポジウム資料集

10

118

122

2005-02-17

eng

publisher

Proceedings of the symposium on environmental remote sensing