GTCP: The Use of Cosmogenic 35S and 7BE in Determing Depositional Fluxes of SO2

通过测量气溶胶、降水收集物和气体（35SO2）中的宇宙成因35S和7Be， PIs计划在每月的时间尺度上确定35S作为时间函数的以下特性：(1) 35SO2的氧化速率，(2)湿沉降中源自云内氧化的35SO4的比例，(3)35SO4气溶胶的平均停留时间，(4)35SO2的“干”沉降通量。所测各组分中两种核素的浓度和每一种的湿降水通量（结合有效产生比）提供了35SO2在大气中的去向的完整分析)。pi计划每月进行一次测量，以确定控制大气中35SO2清除的参数的季节变化。PIs希望表明35S和稳定S在边界层盒中在一个月的时间尺度上是均匀的，这样35S得到的结果就可以直接适用于普通的气态SO2，并将得到一个完整的大气SO2系统作为地点和季节的函数的评价。

Using measurements of cosmogenic 35S and 7Be in aerosols and precipitation collections and gas (35SO2), the PIs plan to 1determine, on a monthly timescale, the following properties of 35S as a function of time: (1) the rate of 35SO2 oxidation, (2) the fraction of 35SO4 in wet deposition originating from in-cloud oxidation, (3) the mean residence time of 35SO4 aerosol and (4) the "dry" deposition flux of 35SO2. The concentrations of the two nuclides in the various components measured and the wet precipitation fluxes of each (combined with the effective production ratio) provides a complete analysis of the fate of 35SO2 in the atmosphere). The PIs intend to make measurements on a monthly basis to define the seasonal variations in the parameters controlling the removal of 35SO2 from the atmosphere. The PIs desire to show that 35S and stable S are homogenized in the boundary layer box on a monthly timescale, in which case the results obtained from 35S are directly applicable to ordinary gaseous SO2 and a complete evaluation of the atmospheric SO2 system as a function of locale and season will be obtained.