The Quantitative Assessment of the Mt. Pinatubo Signal in Antarctic Snow

这一奖项是为了支持一项研究，该研究在南极附近对地表积雪进行采样，并在南极附近钻探浅层岩芯，以寻找1991年6月山体喷发的证据。菲律宾的皮纳图博。卫星、地面和机载大气仪器可对火山喷发排放的二氧化硫的数量以及火山二氧化硫产生的平流层气溶胶的全球分布和衰变进行广泛的测量和观测。南极洲的地面和空中测量清楚地表明，这次喷发产生的平流层硫酸盐气溶胶在1991年底到达南半球的高纬度，并在整个1993年一直存在于南极大气中。南极地区最近采集的雪坑样本的初步结果表明，Pinatubo信号是存在的，并可以与1991年8月中旬发生的另一次火山喷发(Cerro Hudson)的信号区分开来。结合皮纳图博已知的硫酸盐气溶胶总产量，拟议的采样和分析将产生必要的定量信息，以建立低纬火山喷发的爆炸性与南极雪中相应信号的幅度之间的经验关系。

This award is for support for a study to sample surface snow in pits and to drill shallow cores in the vicinity of South Pole to look for evidence of the June, 1991, eruption of Mt. Pinatubo in the Philippines. Extensive measurements and observations by satellite, ground-based and airborne atmospheric instruments are available regarding the amount of sulfur dioxide emitted from the eruption, as well as the global distribution and decay of the stratospheric aerosols derived from the volcanic sulfur dioxide. Ground-based and airborne measurements in Antarctica clearly indicate that the stratospheric sulfate aerosols from this eruption reached high southern latitudes in late 1991 and persisted in the Antarctic atmosphere through 1993. Preliminary results from snow pit samples recently taken in the South Pole area indicate that the Pinatubo signal exists and can be separated from the signal of another volcanic eruption (Cerro Hudson) which occurred in mid-August, 1991. Combined with the known total sulfate aerosol production from Pinatubo, the proposed sampling and analyses will yield the quantitative information necessary to establish empirical relationships between the explosivity of a low-latitude eruption and the amplitude of its corresponding signals in Antarctic snow.