| DOI: | 10.2172/1221164
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| 报告号: | Final report: DOE-CUBOULDER--06080
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| 报告题名: | Collaborative research. Study of aerosol sources and processing at the GVAX Pantnagar Supersite |
| 作者: | Worsnop, Doug [Univ. of Colorado, Boulder, CO (United States)]; Volkamer, Rainer [Univ. of Colorado, Boulder, CO (United States)]
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| 出版年: | 2012
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| 发表日期: | 2012-08-13
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| 总页数: | 9
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | Atmosphere
; Scattered solar radiation
; radiation closure
; aerosol direct effect
; aerosol optical properties
; reactive trace gases
; secondary organic aerosol
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| 中文主题词: | 大气科学
; 碳
; 氮
; 大气辐射
; 吸收
; 散射
; 太阳辐射
; 二氧化氮
; 氧
; 吸附作用
; 光学厚度
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| 主题词: | ATMOSPHERE
; CARBON
; NITROGEN
; ATMOSPHERIC RADIATION
; ABSORPTION
; SCATTERING
; SOLAR RADIATION
; NITROGEN DIOXIDE
; OXYGEN
; OPTICAL DEPTH
|
| 英文摘要: | The Two Column Aerosol Project (TCAP) investigated uncertainties in the aerosol direct effect in the northern hemisphere mid-latitudes. The University of Colorado 2D-MAX-DOAS and LED-CE-DOAS instruments were collocated with DOEâs Atmospheric Radiation Measurement (ARM) Mobile Facility (AMF) and Mobile Aerosol Observing System (MAOS) during the TCAP-1 campaign at Cape Cod, MA (1 July to 13 August 2012). We have performed atmospheric radiation closure studies to evaluate the use of a novel parameter, i.e., the Raman Scattering Probability (RSP). We have performed first measurements of RSP almucantar scans, and measure RSP in spectra of scattered solar photons at 350nm and 430nm. Radiative Transfer Modelling of RSP demonstrate that the RSP measurement is maximally sensitive to infer even extremely low aerosol optical depth (AOD < 0.01) reliably by DOAS at low solar relative azimuth angles. We further assess the role of elevated aerosol layers on near surface observations of oxygen collision complexes, O 2-O2. Elevated aerosol layers modify the near surface absorption of O2-O2 and RSP. The combination of RSP and O2-O2 holds largely unexplored potential to better constrain elevated aerosol layers and measure column aerosol optical properties such as aerosol effective radius, extinction, aerosol phase functions and refractive indices. The TCAP deployment also provides a time series of reactive trace gas vertical profiles, i.e., nitrogen dioxide (NO2) and glyoxal (C2H2O2), which are measured simultaneously with the aerosol optical properties by DOAS. NO2 is an important precursor for ozone (O3) that modifies oxidative capacity. Glyoxal modifies oxidative capacity and is a source for brown carbon by forming secondary organic aerosol (SOA) via multiphase reactions in aerosol and cloud water. We have performed field measurements of these gases during TCAP, and conducted laboratory experiments to quantify for the first time the Setschenow salting constant, KS, of glyoxal in sulfate aerosols. Knowledge about KS is prerequisite to predict how increasing sulfate concentrations since pre-industrial times have modified the formation of SOA from biogenic gases in atmospheric models. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1221164
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/40576
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| 1221164.pdf（1419KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Worsnop, Doug [Univ. of Colorado, Boulder, CO ,Volkamer, Rainer [Univ. of Colorado, Boulder, CO . Collaborative research. Study of aerosol sources and processing at the GVAX Pantnagar Supersite. 2012-01-01.
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