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Multiwavelength lidar observations of the decay phase of the stratospheric aerosol layer produced by the eruption of Mount Pinatubo in June 1991

机译:1991年6月皮纳图博火山爆发产生的平流层气溶胶层衰减相的多波长激光雷达观测

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A small three-wavelength (355-, 532-, and 1064-nm) lidar system at NASA Langley Research Center in Hampton, Virginia, has been used since 1992 to make measurements on stratospheric aerosols. The data have been processed to study the decay rate of the stratospheric aerosol layer formed after the eruption of Mount Pinatubo in 1991 and its modulation, the aerosol effective radius, and the column mass loading. The stratospheric aerosol decay curves show annual and biennial cycles as well as short-term changes. At 532 nm, the decay time constant was 302 days for the period from February 1992 to August 1994 and had increased to 645 days for the period from September 1994 to December 1997. By 1996 the integrated stratospheric aerosol backscatter had fallen to levels (7.7 X 10(-5) sr(-1) at 532 nm) close to those seen in 1979 and 1989-1991. This decreasing trend was still continuing in 1997, showing no evidence for any anthropogenic contribution to the stratospheric aerosol. (C) 1998 Optical Society of America. [References: 25]
机译:自1992年以来,位于弗吉尼亚州汉普顿的NASA兰利研究中心使用了一个小型的三波长(355、532和1064 nm)激光雷达系统,对平流层气溶胶进行了测量。处理这些数据以研究1991年皮纳图博火山喷发及其调节后形成的平流层气溶胶层的衰减速率,气溶胶有效半径和色谱柱质量负荷。平流层气溶胶衰减曲线显示出一年和两年一次的周期以及短期变化。在532 nm处,1992年2月至1994年8月期间的衰减时间常数为302天,而1994年9月至1997年12月期间的衰减时间常数已增加至645天。到1996年,平流层气溶胶反向散射积分降到了水平(7.7 X 10(-5)sr(-1)在532 nm)接近于1979和1989-1991。这种下降趋势在1997年仍在继续,没有证据表明对平流层气溶胶有任何人为的贡献。 (C)1998年美国眼镜学会。 [参考:25]

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