近百年北半球中纬度火山灰尘幕指数的估量

从气候系统的能源--太阳入射能变化的角度来考虑,主要由火山活动引起的大气透明度变化的作用显著超过已知的大气顶上的太阳常数变化幅度.为此,本文根据近百年来北半球中纬度的和近年来我国实测的太阳直接辐射以及北半球中纬度逐年气溶胶光学厚度等资料,对Lamb（1970）的工作进行了修正和补充,重新估量得出了1883-1982逐年的北半球中纬度火山灰尘幕指数V_N·M.

THE ASSESSMENT OF VOLCANIC DUST VEIL INDEX OF NORTHERN TEMPERATE ZONE IN THE RECENT 100 YEARS

Considering the fact that the controlling role played toy the volcanic dust is in the change of solar constant rather than in solar activity, we have gathered plenty of information for volcanic eruptions and utilized three sets of data: 1. annual direct radiation of Northern temperate zone from Pivavarova （1977）; 2. mean annulal aerosol optical depth between 20 °N and 65°N from Bryson （1980） ; 3. winter-summer mean direct radiation for East China in the last 23 years. We have tried to correct the pioneering work of Lamb （1970）, assessed and reestablished the yearly volcanic dust veil index of Northern temperate zone （V _N·M） from 1883 to 1982.