An Airborne Study of the Chemistry of Atmospheric Sulfur

大气硫化学的机载研究

• 批准号: 9420721
• 负责人: Alan Bandy
• 金额: $ 44万
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-15 至 1999-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9420721&HistoricalAwards=false
• 关键词: Airborne; Study; Chemistry; Atmospheric; Sulfur

9420721 Bandy The major objective of this research is to quantify the efficiencies for the conversion of dimethylsulfide (DMS) to its various gas phase oxidation products in a remote marine atmosphere. This information is fundamental to assessing the significance of DMS as a precursor for atmospheric aerosol in the marine environment. An enhanced understanding of this linkage will provide a basis for incorporating tropospheric aerosol into global climate models and thereby contribute to a reduction in the present large uncertainty in the calculated climate forcing due to atmospheric aerosols derived from marine sources of DMS. The experimental work plan is centered on the measurement of sulfur dioxide (SO2), DMS, and carbonyl sulfide (OCS) during the field portion of the Southern Hemisphere Marine Aerosol Characterization Experiment (ACE-1). A novel gas chromatograph/quadrupole mass spectrometer (GC/MS) system will be used on-board the NCAR C-130 aircraft platform to perform measurements of these sulfur-containing gases. This GC/MS instrumentation will measure these three sulfur analytes at a frequency of one sample every four to five minutes and with a minimum detectability of approximately one part-per-trillion (volume to volume). These researchers will combine their analytical data with other ACE-1 measurements to determine the mechanisms, rates, and efficiencies of the chemical processes that affect the formation, growth, distribution, and radiative effects of atmospheric aerosols derived from sulfur gas precursors.

9420721 Bandy这项研究的主要目标是量化在遥远的海洋大气中将二甲基硫化物转化为各种气相氧化产物的效率。这一信息对于评估海洋环境中DMS作为大气气溶胶前体的重要性至关重要。加强对这种联系的了解将为将对流层气溶胶纳入全球气候模式提供基础，从而有助于减少目前计算的气候强迫的巨大不确定性，这是由于海洋海洋来源的大气气溶胶造成的。实验工作计划的中心是在南半球海洋气溶胶特性实验(ACE-1)的野外部分测量二氧化硫(SO2)、二甲基硫(DMS)和羰基硫化物(OCS)。NCAR C-130飞机平台上将使用一种新型的气相色谱仪/四极杆质谱仪(GC/MS)系统来测量这些含硫气体。该GC/MS仪器将以每四到五分钟一个样品的频率测量这三种硫分析物，最低可检测性约为万亿分之一(体积对体积)。这些研究人员将把他们的分析数据与其他ACE-1测量相结合，以确定影响来自硫磺气体前体的大气气溶胶的形成、生长、分布和辐射效应的化学过程的机制、速率和效率。