New Particle Formation and Growth in an Isoprene-Dominated Ozark Forest: From Sub-5 nm to CCN-Active Sizes
New Particle Formation and Growth in an Isoprene-Dominated Ozark Forest: From Sub-5 nm to CCN-Active Sizes
复制标题
DOI：
10.1080/02786826.2014.984801
复制
发表时间：
2014-11
影响因子：
5.2
通讯作者：
Huan Yu;J. Ortega;J. Smith;A. Guenther;V. Kanawade;Y. You;Yiying Liu;K. P. Hosman;T. Karl;R. Seco;C. Geron;S. Pallardy;L. Gu;J. Mikkilä;Shan‐Hu Lee
中科院分区：
文献类型：
--
作者：
Huan Yu;J. Ortega;J. Smith;A. Guenther;V. Kanawade;Y. You;Yiying Liu;K. P. Hosman;T. Karl;R. Seco;C. Geron;S. Pallardy;L. Gu;J. Mikkilä;Shan‐Hu Lee
北奥扎克斯塔的颗粒调查：NOx，氧化物，异戊二烯研究(黑比诺)于2012年5月至10月在以异戊二烯排放为主的密苏里州森林中进行。这项研究报告了新粒子的形成和新粒子成长到云凝聚核(CCN)的结果--在该场战役中观测到的有效尺寸(∼100 nm)。在一次典型的NPF事件中，测量到的亚5 nm粒子最大可达∼20,000 cm−3。成核速率J1较高(11.0±10.6 cm−3 S−1)，比5 nm颗粒的成核率(J5)高一个数量级。在测量天数中，观测到了小于5 nm的粒子形成事件，生物挥发性有机化合物(BVOCs)和SO2贫乏的西北风气团(90%)比富含BVOCs的南风气团(13%)更容易形成颗粒物。约80%的亚5 nm粒子事件导致了进一步的生长。偏南气团中的高温和高气溶胶含量不利于成核，而偏南气团中较高的BVOCs有利于新颗粒长大到CCN活性尺寸。总体而言，在每个NPF事件中，0.4-9.4%的亚5 nm颗粒长大到CCN活性尺寸。在连续几天发生的地区性NPF事件期间，CCN尺寸颗粒的浓度平均增加了4.7倍。在宣传活动期间，在所有13个区域NPF事件中，通常都能观察到从新粒子产生CCN粒子的增加。版权所有2014年美国气溶胶研究协会
Particle Investigations at a Northern Ozarks Tower: NOx, Oxidant, Isoprene Research (PINOT NOIR) were conducted in a Missouri forest dominated by isoprene emissions from May to October 2012. This study presents results of new particle formation (NPF) and the growth of new particles to cloud condensation nuclei (CCN)-active sizes (∼100 nm) observed during this field campaign. The measured sub-5 nm particles were up to ∼20,000 cm−3 during a typical NPF event. Nucleation rates J1 were relatively high (11.0 ± 10.6 cm−3 s−1), and one order of magnitude higher than formation rates of 5 nm particles (J5). Sub-5 nm particle formation events were observed during 64% of measurement days, with a high preference in biogenic volatile organic compounds (BVOCs)- and SO2-poor northwesterly (90%) air masses than in BVOCs-rich southerly air masses (13%). About 80% of sub-5 nm particle events led to the further growth. While high temperatures and high aerosol loadings in the southerly air masses were not favorable for nucleation, high BVOCs in the southerly air masses facilitated the growth of new particles to CCN-active sizes. In overall, 0.4–9.4% of the sub-5 nm particles grew to CCN-active sizes within each single NPF event. During a regional NPF event period that took place consecutively over several days, concentrations of CCN size particles increased by a factor of 4.7 in average. This enhanced production of CCN particles from new particles was commonly observed during all 13 regional NPF events during the campaign period. Copyright 2014 American Association for Aerosol Research