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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Spatial and temporal variations of new particle formation in East Asia using an NPF-explicit WRF-chem model: North-south contrast in new particle formation frequency
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Spatial and temporal variations of new particle formation in East Asia using an NPF-explicit WRF-chem model: North-south contrast in new particle formation frequency

机译：NPF-WRF-chem模型在东亚新颗粒形成的时空变化：新颗粒形成频率的南北向对比

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A recently developed new particle formation (NPF)-explicit version of the Weather Research and Forecasting Chemistry (WRF-chem) model can explicitly calculate the growth and sink of nucleated clusters with 20 aerosol size bins from 1 nm to 10 μm in diameter. In this study, the model was used to investigate spatial and temporal variations in NPF event frequency and the concentrations of aerosols (condensation nuclei, CN) and cloud condensation nuclei (CCN) within the boundary layer in East Asia in spring 2009. We found a distinct north-south contrast in the NPF frequency and mechanism in East Asia. NPF occurred mainly during limited periods over certain regions between 30° and 45°N (northeast China, Korea, and Japan, including regions around the active volcanoes Miyakejima and Sakurajima). In these latitudes, NPF was suppressed by high concentrations of preexisting particles under stagnant air conditions associated with high-pressure systems, although nucleation occurred more extensively during most of the simulation period. In contrast, south of 30°N, nucleation and NPF were both infrequent because of low SO_2 emissions and H_2SO_4 concentrations. The period-averaged NPF frequency at 30°-45°N was three times that at 20°-30°N. This north-south contrast in NPF frequency was validated by surface measurements in outflow regions of East Asia. The simulated period- and domain-averaged contribution of secondary particles was estimated to be 44% for CN (>10 nm) and 26% for CCN at a supersaturation of 1.0%, though the contribution was highly sensitive to the amount and size distribution of primary aerosol emissions and the rate coefficient of the nucleation parameterization. Key Points Simulation of NPF, CN, and CCN in East Asia using the NPF-explicit WRF-chem Distinct north-south contrast in the frequency and mechanism of NPF in East Asia Estimation of the contribution of primary and secondary particles to CN and CCN
机译：天气研究和预测化学（WRF-chem）模型的最新开发的新粒子形成（NPF）显式版本可以显式计算具有20个气溶胶大小的容器（直径从1 nm到10μm）的有核簇的生长和沉降。在这项研究中，该模型用于调查NPF事件频率的时空变化以及2009年春季东亚边界层内气溶胶（凝结核，CN）和云凝结核（CCN）的浓度。东亚的NPF频率和机制存在明显的南北差异。 NPF主要发生在30°至45°N的某些区域（中国东北，韩国和日本，包括活火山三宅岛和樱岛周围的区域）的有限时期内。在这些纬度中，尽管在大多数模拟期间成核发生的范围更大，但在与高压系统相关的停滞的空气条件下，NPF被高浓度的预先存在的颗粒所抑制。相反，在30°N以南，由于低的SO_2排放和H_2SO_4浓度，成核和NPF均很少见。 30°-45°N的周期平均NPF频率是20°-30°N的周期平均三倍。 NPF频率的这种南北对比通过东亚流出区域的地面测量得到了证实。在1.0％的过饱和度下，对于CN（> 10 nm），次级粒子的模拟周期平均和区域平均贡献估计为44％，对于CCN则为26％，尽管该贡献对纳米粒子的数量和尺寸分布高度敏感一次气溶胶排放和成核参数化的速率系数。使用NPF显式WRF-chem对东亚NPF，CN和CCN进行关键点模拟在东亚NPF的频率和机理上有明显的南北对比估算一次和二次粒子对CN和CCN的贡献

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