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Observational study of the physical and chemical characteristics of the winter radiation fog in the tropical rainforest in Xishuangbanna, China

引用

Science China Earth Sciences 2021年第11期64卷 1982-1995页

作者： Yuan WANG Shengjie NIU Chunsong LU Jingjing LV Jing ZHANG Hongwei ZHANG Sirui ZHANG Naifu SHAO Wei SUN Yuchen JIN Qinghai SONG Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters and Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological AdministrationNanjing University of Information Science&Technology(NUIST)Nanjing 210044China College of Safety Science and Engineering Nanjing Tech UniversityNanjing 210009China Key Laboratory of Tropical Forest Ecology(TFE) Xishuangbanna Tropical Botanical GardenChinese Academy of Sciences(CAS)Menglun 666303China Henan Meteorological Observation and Data Center Zhengzhou 450003China

We conducted a three-month field experiment focusing on the physical and chemical characteristics of fog in a tropical rainforest in Xishuangbanna,Southwest China,in the winter of *** general,the fog would form at midnight and persist because of the increased long-wave radiative cooling combined with the high relative humidity,gentle breeze,and a relatively low aerosol number concentration in the forest;the fog would dissipate before noon due to the increasing turbulence near the *** diurnal cycle is typical for radiation *** microphysical fog properties included a relatively low number concentration of the fog droplet,large droplet size,high liquid water content,narrow droplet number-size distribution,and high *** chemical properties showed that the fog water was slightly alkaline with low electrical conductivity,whereas the highest proportions of anions and cations therein were Cl^(−)and Ca^(2+),respectively;the chemical components were enriched in small fog *** addition,we indirectly calculated the fog supersaturation according to theκ-Köhler *** found that condensation broadens the droplet number-size distribution at relatively low supersaturation,which is positively correlated with the fog-droplet number concentration and negatively correlated with the droplet mean-volume diameter;this affects the key microphysical processes of fog.

关键词： Radiation fog formation and disappearance mechanisms Physical and chemical characteristics Supersaturation Tropical rainforest

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