搜索结果: 1-15 共查到“大气科学 N2O5”相关记录16条 . 查询时间(0.072 秒)
中国科学院生态中心等发现大气N2O5非均相生成新机制（图）
生态中心 大气N2O5 气相氧化
2023/4/23
硝酸盐是大气PM2.5的主要组成。大气硝酸盐的两个主要生成途径分别为NO2的气相氧化（与OH自由基反应）以及N2O5的水解。传统观点认为，大气N2O5的唯一来源是NO2和大气NO3自由基的反应，而NO3自由基主要来自于NO2与O3反应。
硝酸盐是大气PM2.5的主要组成。大气硝酸盐的两个主要生成途径分别为NO2的气相氧化（与OH自由基反应）以及N2O5的水解。传统观点认为大气N2O5的唯一来源是NO2和大气NO3自由基的反应，而NO3自由基主要来自于NO2与O3反应。在国家自然科学基金大气霾化学基础科学中心等项目（22122610, 22188102, 22006158）资助下，中国科学院生态环境研究中心贺泓院士团队与宾夕法尼亚大...
五氧化二氮(N2O5）是对流层大气化学过程的关键物种之一，其在颗粒物表面的非均相水解反应是硝酸盐生成的重要途径。N2O5主要来自NO2和NO3自由基的化学反应，由于日间NO3的光解反应较快且NO3能够被NO快速消耗，使得日间N2O5的生成受阻，加之N2O5具有极强的光不稳定特性，致使目前的研究普遍认为N2O5化学反应在日间不重要，N2O5非均相水解反应也仅仅在夜间对硝酸盐的生成产生重要贡献。
近期，安光所谢品华研究员课题组在大气NO3和N2O5同步高灵敏探测研究方面取得新进展，相关研究工作发表在Optics Express（光学二区）上。
Night-time chemistry above London: measurements of NO3 and N2O5 from the BT Tower
Night-time chemistry London NO3 N2O5 the BT Tower
2010/10/21
Broadband cavity enhanced absorption spectroscopy (BBCEAS) has been used to measure the sum of concentrations of NO3 and N2O5 from the BT (telecommunications) Tower 160 m above street level in central...
Sensitivity of a global model to the uptake of N2O5 by tropospheric aerosol
a global model N2O5 tropospheric aerosol
2010/8/16
The uptake of N2O5 on aerosol impacts atmospheric concentrations of NOx and so O3, OH, and hence CH4. Laboratory studies show significant variation in the rate of uptake, with a general decline in the...
Uptake of NO3 and N2O5 to Saharan dust, ambient urban aerosol and soot: a relative rate study
NO3 and N2O5 Saharan dust ambient urban aerosol and soot a relative rate study
2010/8/12
The uptake of NO3 and N2O5 to Saharan dust, ambient aerosols and soot was investigated using a novel and simple relative rate method with simultaneous detection of both NO3 and N2O5. The use of cavity...
Toward a general parameterization of N2O5 reactivity on aqueous particles: the competing effects of particle liquid water, nitrate and chloride
N2O5 reactivity aqueous particles particle liquid water nitrate chloride
2009/11/19
The heterogeneous reaction of N2O5 on mixed organic-inorganic aerosol particles was investigated using an entrained aerosol flow tube coupled to a custom-built chemical ionization mass spectrometer. L...
Reactive uptake coefficients for heterogeneous reaction of N2O5 with submicron aerosols of NaCl and natural sea salt
Reactive uptake coefficients N2O5 submicron aerosols NaCl natural sea salt
2009/3/4
The kinetics of uptake of gaseous N2O5 on submicron aerosols containing NaCl and natural sea salt have been investigated in a flow reactor as a function of relative humidity (RH) in the range 30-80% a...
Kinetics and mechanism of the uptake of N2O5 on mineral dust at 298 K
Kinetics mechanism N2O5 mineral dust
2009/2/19
The heterogeneous reaction of N2O5 with mineral (Saharan) dust has been studied at T=298 K using a combination of Knudsen and DRIFTS cells for kinetic and product investigations, respectively. The ini...
Measurements of N2O5, NO2, and O3 east of the San Francisco Bay
N2O5 NO2 O3 east of the San Francisco Bay
2009/2/6
We report in situ measurements of N2O5, NO2, and O3 in Contra Costa County, California during January 2004. Mixing ratios of N2O5, an intermediate compound in the atmosphere's nocturnal cleansing proc...
The effect of varying levels of surfactant on the reactive uptake of N2O5 to aqueous aerosol
effect of varying levels surfactant reactive uptake N2O5 aqueous aerosol
2009/1/7
Recent observations have detected surface active organics in atmospheric aerosols. We have studied the reaction of N2O5 on aqueous natural seawater and NaCl aerosols as a function of sodium dodecyl su...
The heterogeneous chemical kinetics of N2O5 on CaCO3 and other atmospheric mineral dust surrogates
heterogeneous chemical kinetics N2O5 CaCO3 atmospheric mineral dust surrogates
2009/1/6
Uptake experiments of N2O5 on several mineral dust powder samples were carried out under continuous molecular flow conditions at 298±2 K. At [N2O5]0=(4.0±1.0)×1011 cmW22;3 we have found γss values ...
High resolution vertical distributions of NO3 and N2O5 through the nocturnal boundary layer
NO3 N2O5 nocturnal boundary layer
2008/11/27
The shallow mixing depth and vertical stratification of the lowest levels of the atmosphere at night has implications for the chemistry of nitrogen oxides emitted from the surface. Here we report vert...
Parameterization of N2O5 reaction probabilities on the surface of particles containing ammonium, sulfate, and nitrate
N2O5 sulfate nitrate
2008/11/19
A parameterization was developed for the heterogeneous reaction probability (γ) of N2O5 as a function of temperature, relative humidity (RH), particle composition, and phase state, for use in advanced...