The Influence of Scavenging by Precipitation on Radiatively Important Aerosols and Optical Properties of the Troposphere

降水清除对对流层辐射重要气溶胶和光学特性的影响

• 批准号: 9414293
• 负责人: James Galloway
• 金额: $ 53.19万
• 依托单位: University of Virginia Main Campus
• 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: 1995-06-01 至 2000-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9414293&HistoricalAwards=false
• 关键词: Influence; Scavenging; Precipitation; Radiatively; Important

9414293 Galloway Recent modeling studies indicate that anthropogenic and natural aerosols impact climate through direct (radiation absorption and scattering) and indirect (cloud albedo, frequency, and extent) effects. Scavenging and removal by precipitation are the principal sinks for radiatively important aerosols. To develop a predictive capability for the influence of aerosols on climate, the deposition flux of non-sea salt (nns) SO4 =, black carbon, and mineral aerosol, and the corresponding influences on optical characteristics of the scavenged air parcel must be quantified over space and time. As part of Theme 2 of the Atmosphere/Ocean Chemistry Experiment (AEROCE), Phase III, the University of Virginia 1) measure the chemical composition of precipitation at Bermuda and Barbados; 2) measure, as a function of wavelength, the optical extinction coefficient for insoluble aerosol scavenged by precipitation at the two site; 3) quantify the influence of scavenging and removal by precipitation on the aerosol burden and associated radiative properties of S, N, C, and mineral aerosol over the western North Atlantic Ocean; and 4) provide data for the chemical composition of precipitation to evaluate and refine atmospheric model calculations proposed under AEROCE and as ancillary studies to the program.

9414293 Galloway 最近的建模研究表明，人为和自然气溶胶通过直接（辐射吸收和散射）和间接（云反照率、频率和范围）影响气候。 降水清除和清除是具有重要辐射作用的气溶胶的主要汇。 为了开发气溶胶对气候影响的预测能力，必须在空间和时间上量化非海盐 (nns) SO4 =、黑碳和矿物气溶胶的沉积通量，以及对扫气气团光学特性的相应影响。 作为大气/海洋化学实验 (AEROCE) 第三阶段主题 2 的一部分，弗吉尼亚大学 1) 测量百慕大和巴巴多斯降水的化学成分； 2) 测量两个地点的降水清除的不溶性气溶胶的消光系数，作为波长的函数； 3) 量化降水清除和清除对北大西洋西部上空 S、N、C 和矿物气溶胶的气溶胶负荷和相关辐射特性的影响； 4) 提供降水化学成分数据，以评估和完善 AEROCE 下提出的大气模型计算，并作为该计划的辅助研究。