Exploring the ‘prehistory’ of the equatorial stratosphere with observations following major volcanic eruptions
Exploring the ‘prehistory’ of the equatorial stratosphere with observations following major volcanic eruptions
复制标题
通过大型火山喷发后的观测探索赤道平流层的“史前史”
作者：
Hamilton Kevin;Sakazaki T.
自1953年以来，低纬度站的气象气球探测表明，赤道平流层的盛行风在平均约27个月的周期内经历了强东风和强西风的显着交替。为了全面了解这种“准两年振荡”（QBO）的行为，人们尝试重建 1953 年之前的赤道平流层风。本文考虑了一种通过分析火山喷发后平流层气溶胶漂移的观测来估计遥远过去的风的方法。我们回顾了 1883 年喀拉喀托火山喷发的著名案例，并推断了 1902 年 5 月加勒比主要岛屿喷发后的风。这一 1902 年的风估计为最近发表的 QBO 重建提供了独立证实。
Since 1953 meteorological balloon soundings from low‐latitude stations have revealed that the prevailing winds in the equatorial stratosphere undergo a remarkable alternation between strong easterlies and strong westerlies in a cycle with a period averaging ~27 months. To understand the full range of the behavior of this ‘quasibiennial oscillation’ (QBO), attempts have been made to reconstruct the equatorial stratospheric winds in the pre‐1953 era. This paper considers one approach to estimating winds in the distant past, through analysis of observations of the drift of stratospheric aerosol after volcanic eruptions. We review the famous case of the 1883 eruption of Krakatau and also deduce the winds following the major Caribbean island eruptions in May 1902. This 1902 wind estimate provides independent confirmation of a recently published reconstruction of the QBO.