UV Data Record Release 1, daily maximum NO2 photolysis rate constant - Multimission

This product gives the daily maximum value for the photolysis rate constant of the important tropospheric photolysis reaction NO2->O(3P)+NO near the Earth's surface. The reaction of the exited oxygen atom thus formed with oxygen molecule is a major source of troposheric ozone. The solar spectral actinic flux near the Earth's surface at a given location and time of day is multiplied by quantum yield of the reaction and ozone absorption cross section, and the photolysis rate constant is obtained upon integration over wavelength. The rate constants are calculated half-hourly intervals during the sunlit part of the day and the maximum value is reported. Input total column ozone data are obtained from GOME-2/Metop measurements while daily cloud data are collected from multiple overpasses of AVHRR/3 instrument onboard both Metop and NOAA satellites.

本数据集提供地球表面附近重要对流层光解反应NO₂→O(³P)+NO的光解速率常数日最大值。由此生成的激发态氧原子与氧分子的反应，是对流层臭氧的主要来源。将特定地点、特定时刻的地球表面附近太阳光谱光化通量，与该反应的量子产率及臭氧吸收截面相乘，再通过波长积分即可得到光解速率常数。光解速率常数在日间日照时段以半小时为间隔进行计算，并给出其最大值。输入的总柱臭氧数据来自GOME-2/Metop卫星观测结果，而每日云量数据则收集自Metop与NOAA卫星搭载的AVHRR/3仪器的多次过境观测。