Airborne measurements of nucleation mode particles II: boreal forest nucleation events
Airborne measurements of nucleation mode particles II: boreal forest nucleation events
复制标题
成核模式粒子的机载测量 II：北方森林成核事件
DOI：
10.5194/acp-9-937-2009
复制
发表时间：
2008
影响因子：
6.3
通讯作者：
Y. Viisanen
中科院分区：
文献类型：
--
作者：
C. O’Dowd;Y. Yoon;W. Junkermann;P. Aalto;M. Kulmala;H. Lihavainen;Y. Viisanen
本文报道了在芬兰南部北方森林上空的成核事件期间，对成核模式气溶胶浓度的空中测量结果。三个案例研究的分析，试图在这些事件发生的空间尺度，并确定粒子生产的源区。对于所提出的情况，没有证据表明在自由对流层中存在成核模式粒子。成核模式粒子首先检测到在地面层的夜间逆温打破，并发展成当前一天的新的边界层。就空间变异性而言，观察到成核模式颗粒浓度的显着变异性，这归因于地形的变化，其中包括森林树冠和冰冻湖泊的混合。在波的尼亚湾的测量表明，没有成核模式在海上，并确认该事件的规模与北方森林规模和新的粒子直接产生以上的森林冠层。
Airborne measurements of nucleation mode aerosol concentrations during nucleation events over the boreal forest of southern Finland are reported. Three case studies are analysis in an attempt to characterise the spatial scales over which these events occur and to identify the source region for particle production. For the cases presented, there is no evidence of nucleation mode particles in the Free Troposphere. Nucleation mode particles are first detected in the surface layer as the nocturnal inversion breaks up and develops into the current-day's new boundary layer. In terms of spatial variability, significant variability in the concentration of nucleation mode particles was observed and was attributed to changes in the topography which comprised a mix of forest canopy and frozen lakes. Measurements over the Gulf of Bothnia indicated no nucleation mode over the sea and confirm that the scale of the events is associated with the boreal forest scale and that the new particles are produced directly above the forest canopy.