Studies on physical-chemical processes of aerosol-cloud interaction

气溶胶-云相互作用的物理化学过程研究

• 批准号: 17201003
• 负责人: KONDO Yutaka
• 金额: $ 32.7万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17201003/
• 关键词: aerosol; black carbon; mixing state; CCN; cloud; indirect effect; climate changel

Cloud condensation nuclei (CCN) activity is determined by aerosol diameter, fraction of water soluble components, and surface tension. We quantified CCN activities as a function of these parameters and related them with cloud formation processes.A)Controlling factors of CCN activities of aerosol in urban airWe measured chemical composition, mixing states, and CCN activity of aerosol in Tokyo using an aerosol mass spectrometer, black carbon (BC) instruments, and a CCN counter. We found that CCN activity of thickly coated BC is controlled by the chemical composition of water soluble compounds. The CCN activity of thinly coated BC is controlled by the thickness of the coating.B)Measurements of aerosol-cloud interactionWe conducted aircraft measurements of aerosol and cloud particles inside and outside of clouds located at 1-2 km near Japan in spring. We showed that thickly coated BC particles were taken up into clouds efficiently, consistent with the ground based measurements. This also s … More hows that BC can be a good tracer to quantitatively study aerosol-cloud interaction.C)Time constant of CCN formationWe showed that CCN activity of aerosol transported from the Asian continent within a few days is controlled mainly by the fraction of water soluble components from the data obtained in Jeju Island, Korea. Decrease in the surface tension of organic aerosol is also estimated to is contribute to the CCN activity. The CCN activity of various types of aerosol was measured also near Beijing. The observed CCN activity is consistent with the understandings obtained in Tokyo and Jeju Is.D)Calibration of the cloud probe and its aerodynamical characteristicsLight scattering cloud probe was calibrated using standard particles with high precision. We made aerodynamical calculations of airflows around the probe mounted on the aircraft and found high collection efficiency of cloud droplets.E)We calculated size distribution of cloud droplets predicted from various CCN concentrations using a trajectory model. Sensitivity of CCN-cloud interaction was estimated by the numerical experiments. Less

云凝结核（CCN）的活性由气溶胶直径、水溶性组分的比例和表面张力决定。我们将CCN活动量化为这些参数的函数，并将它们与云的形成过程联系起来。A)城市空气中气溶胶CCN活性的控制因素我们使用气溶胶质谱仪、黑碳（BC）仪器和CCN计数器测量了东京气溶胶的化学成分、混合状态和CCN活性。我们发现厚包覆BC的CCN活性受水溶性化合物的化学组成控制。薄涂层BC的CCN活性受涂层厚度控制。B)气溶胶-云相互作用的测量我们于春季在日本附近1-2公里的云层内外对气溶胶和云粒子进行了飞机测量。我们发现，厚涂层的BC粒子被有效地吸收到云层中，这与地面测量结果一致。c) CCN形成的时间常数。我们从韩国济州岛获得的数据表明，几天内从亚洲大陆输送的气溶胶的CCN活性主要由水溶性组分的分数控制。有机气溶胶表面张力的降低也有助于CCN的活性。在北京附近还测量了不同类型气溶胶的CCN活度。观测到的CCN活动与在东京和济州岛获得的理解一致。D)云探头及其空气动力学特性的校准使用高精度的标准粒子对微散射云探头进行校准。我们对安装在飞机上的探针周围的气流进行了空气动力学计算，发现云滴的收集效率很高。E)我们使用轨迹模型计算了不同CCN浓度预测的云滴的大小分布。通过数值实验估计了ccn -云相互作用的灵敏度。少

项目成果

Formation Processes of Carbonaceous Aerosols in Urban Air

城市空气中碳质气溶胶的形成过程

• 发表时间: 2006
• 期刊: Earozoru Kenkyu (Japan Association of Aerosol Science and Technology) 21(4)
• 作者: Kondo;Y.;Takegawa;N.;Miyazaki;Y.;Komazaki;Y.;Koike;M
• 通讯作者: M

Contribution of Selected Dicarboxylic and ω-Oxocarboxylic Acids in Ambient Aerosol to the m/z 44 Signal of an Aerodyne Aerosol Mass Spectrometer

• DOI: 10.1080/02786820701203215
• 发表时间: 2007-03
• 期刊: Aerosol Science and Technology
• 影响因子: 5.2
• 作者: N. Takegawa;T. Miyakawa;Kimitaka Kawamura;Yutaka Kondo

Seasonal and diurnal variations of submicron organic aerosol in Tokyo observed using the Aerodyne aerosol mass spectrometer

• DOI: 10.1029/2005jd006515
• 发表时间: 2006-06
• 期刊: Journal of Geophysical Research
• 作者: N. Takegawa;T. Miyakawa;Y. Kondo;J. Jimenez;Q. Zhang;D. Worsnop;M. Fukuda

Partitioning of HNO3 and particulate nitrate over Tokyo: Effect of vertical mixing

• DOI: 10.1029/2005jd006887
• 发表时间: 2006-08
• 期刊: Journal of Geophysical Research
• 作者: Y. Morino;Y. Kondo;N. Takegawa;Y. Miyazaki;K. Kita;Y. Komazaki;M. Fukuda;T. Miyakawa;N. Moteki-N.-Mo

Effects of Mixing State on Black Carbon Measurements by Laser-Induced Incandescence

• DOI: 10.1080/02786820701199728
• 发表时间: 2007-03
• 期刊: Aerosol Science and Technology
• 影响因子: 5.2
• 作者: N. Moteki;Y. Kondo