金星上层霾消光和微物理特性的时空分布  

Spatial and temporal distribution of extinction and microphysical properties in the upper haze of Venus

作　　者：李宜奇 孙晓兵 黄红莲[2,3] 刘晓 提汝芳 郑小兵 樊依哲 余海啸[2,3] 韦祎晨 王宇轩 王宇瑶 LI Yi-Qi;SUN Xiao-Bing;HUANG Hong-Lian;LIU Xiao;TI Ru-Fang;ZHENG Xiao-Bing;FAN Yi-Zhe;YU Hai-Xiao;WEI Yi-Chen;WANG Yu-Xuan;WANG Yu-Yao(School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei 230026,China;Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Key Laboratory of Optical Calibration and Characterization Technology,Chinese Academy of Sciences,Hefei 230031,China;Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]中国科学技术大学环境科学与光电技术学院,安徽合肥230026 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所,安徽合肥230031 [3]中国科学院通用光学定标与表征技术重点实验室,安徽合肥230031 [4]河南理工大学,河南焦作454000

出　　处：《红外与毫米波学报》2024年第5期657-670,共14页Journal of Infrared and Millimeter Waves

基　　金：航天科技创新应用研究项目(E23Y0H555S1);航空科技创新应用研究项目(62502510201)。

摘　　要：金星上层霾消光和微物理特性的变化会影响金星大气的化学和辐射平衡,为研究其时空分布,选取2006~2013年间金星快车SPICAV SOIR仪器的太阳掩星数据进行分析。首先利用MODTRAN建模去除金星中上层大气的吸收效应,后利用剥洋葱法计算67~92 km高度处金星上层霾的消光廓线。研究表明:1)金星上层霾的消光系数总体趋势是随着高度增加而减小。不同区域间的消光系数变化较大,低纬度霾在任务开始时大幅增加,昼夜间霾的平均消光系数略有变化。霾层的垂直光学厚度在10-2数量级。2)上层霾的数密度随高度增加而减小,从南极到北极,上层霾的数密度呈现先增加后减小的趋势。3)低纬度地区的云顶高度较高,为82.7±5.8 km;极区的云顶高度较低,北极地区云顶高度为73.3±2.4 km,南极地区为79±3.5 km。北极地区上霾层平均标高为4.0±0.9 km。The variations in extinction and microphysical properties in the upper haze of Venus have a significant impact on the chemistry and radiative balance of its atmosphere.In order to study their spatial and temporal distribution,we an-alyzed solar occultation data from the Venus Express SPICAV SOIR instruments between 2006 and 2013.To remove the absorption effects of the middle and upper atmosphere of Venus,we used MODTRAN modeling.Then,we retrieved the extinction profiles of the upper haze between 67-92 km using the onion-peeling method.Our findings are as fol-lows:1)The extinction coefficient of the upper haze generally decreases with increasing altitude,but there are signifi-cant variations between different regions.In low latitudes,the extinction increased sharply early in the mission,and the average extinction coefficient of the haze showed minimal changes between day and night.The vertical optical depth of the haze layer was approximately 10-2.2)The number density of the upper haze decreases with increasing altitude.From the south to the north pole,the number density first increases and then decreases.3)The cloud top altitude is higher in low-latitude regions at 82.7±5.8 km,while in polar regions,it is lower with the northern polar region at 73.3±2.4 km and the southern polar region at 79.5±3.5 km.The average scale height of the upper haze layer in the northern polar region is 4.0±0.9 km.

关 键 词：金星大气 上层霾 MODTRAN建模 剥洋葱法 消光系数 数密度 

分 类 号：P185[天文地球—天文学]