大气科学2018，Vol.42Issue(3)：448-462,15.DOI:10.3878/j.issn.1006-9895.1803.17288
浪花和飞沫水滴在海面大风边界层中的垂直传输
Vertical Transport of Sea Spray and Spume Droplets in High-Wind Marine Atmospheric Boundary Layer
摘要
Abstract
Through analyzing the observational data obtained during high-wind conditions over the South China Sea, our results have shown that: (a) The 10-min average horizontal wind speed (u) is almost independent of height; (b) the 10-min average vertical velocity (w) is almost always positive;(c)there exists strong coherent gusty wind with low-frequency (vg, between 1/600 Hz and 1/60 Hz), and nearly random and isotropic turbulent fluctuations with high-frequency (vt, larger than 1/60 Hz). The vertical velocity (w) and the characteristics of the gusty wind and turbulence can be well parameterized through the horizontal wind speed (u). Using the observations of ((u),(w)) and the parameterized gusty wind and turbulence, the Lagrangian stochastic model is implemented to study and simulate vertical transport of spume droplets. The results show that a quite high proportion of spray and spume droplets (the radius is between 10 and 500 μm) teared from the breaking waves can reach the 100 m height in ABL (Atmospheric Boundary Layer) and contribute to the sea salt aerosol flux. The coherent gusty wind during high winds plays an important role in the vertical transport of droplets. Besides, we also parameterize the uplifting fraction of spume droplets that can reach the 100 m height in the ABL by using a nondimensional factor (u) 2/(rpg), where rpis the radius of droplet and g is the gravitational acceleration.关键词
海盐气溶胶/重粒子/海上大气边界层/相干阵风扰动/上扬率/数值模式Key words
Sea salt aerosol/Heavy particle/Marine atmospheric boundary layer/Coherent gusty wind disturbance/Upwelling fraction/Numerical simulation分类
天文与地球科学引用本文复制引用
曾庆存,程雪玲,吴琳..浪花和飞沫水滴在海面大风边界层中的垂直传输[J].大气科学,2018,42(3):448-462,15.基金项目
国家自然科学基金项目41630530,中国科学院前沿科学重点研究项目QYZDY-SSW-DQC002 National Natural Science Foundation of China(Grant 41630530),the Key Research Program of Frontier Sciences,Chinese Academy of Science(Grant QYZDY-SSW-DQC002) （Grant 41630530）
