西北半干旱区激光雷达探测卷云几何特征和光学厚度
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- 英文论文题名：Lidar observations of spatial and temporal variations of cirrus clouds over semi-arid areas in Northwest
- 论文作者：王瑾 ; 张镭 ; 王宏斌 ; 刘瑞金 ; 周碧 ; 黄忠伟 ; 闭建荣 ; 张北斗 ; 张武
- 英文论文作者：WANG Jin ; ZHANG Lei ; WANG Hong-bin ; LIU Rui-jin ; ZHOU Bi ; HUANG Zhong-wei ; BI Jian-rong ; ZHANG Bei-dou ; ZHANG Wu ; Key Laboratory for Semi-Arid Climate Change of the Ministry of Education ; College of Atmospheric Sciences ; Lanzhou University
- 年：2012
- 作者机构：兰州大学大气科学学院半干旱气候变化教育部重点实验室;
- 论文关键词：遥感 ; 几何和光学特征 ; 透过率法 ; 卷云
- 英文论文关键词：remote sensing ; geometrical and optical properties ; transmittance method ; cirrus clouds
- 会议召开时间：2012-10-15
- 会议录名称：第二届中国激光雷达学术会议论文集
- 语种：中文
- 分类号：P407
- 学会代码：LZZS
- 会议名称：第二届中国激光雷达学术会议
- 会议地点：中国山东青岛
- 主办单位：中国科学院合肥物质科学研究院、中国科学院上海光学精密机械研究所、中国科学院大气物理研究所、武汉大学、中国海洋大学、西安理工大学
- 学会名称：《量子电子学报》编辑部
- 页数：7
- 文件大小：794k
- 原文格式：O
- 会议级别：全国
摘要
为了研究中国西北半干旱区卷云几何特征和光学特性的时空分布特征,利用兰州大学半干旱气候与环境观测站(SACOL,35°57′N,104°8′E)的微脉冲激光雷达(MPL-4B)探测卷云过程,分析讨论了卷云的结构、光学性质及其时间变化特征,结果表明,卷云高度分布范围为7~10 km,卷云经历了薄-厚-薄的过程,平均厚度为(2.0±0.5)km。卷云环境温度在-51℃~-39℃范围之内。卷云的光学厚度在0.084~1.649之间,光学厚度随几何厚度的增加而增大,平均光学厚度为0.651±0.403。卷云激光雷达比为(17±17)sr。薄卷云的激光雷达比要比厚卷云的大。光学厚度小于0.3的光学薄卷云出现高度在8.6 km以上,环境温度低于-45℃,几何厚度小于1.8 km,雷达比分布在5~69 sr。
In order to understand the spatial and temporal variations of cirrus over semi-arid areas in Northwest of China,macrophysical and optical characteristics of cirrus clouds were observed by micro pulse lidar(MPL-4B) over Semi-Arid Climate and Environment Observatory of Lanzhou University(SACOL,35°57'N,104°8′E).The structures and optical properties of the cirrus clouds as well as their spatial and temporal variations were discussed and analyzed.The results show that cirrus clouds change from thin to thick,observed ranging from 7 to 10 km,with a mean thickness of(2.0 ± 0.5) km.During this period,the samples have temperature between-51℃ and-39℃.The cloud optical depth increases and then decreases with increasing geometrical depth,ranging from 0.084 to 1.649,with a mean value of 0.651 ±0.403.Lidar ratio of cirrus clouds is(17 ± 17) sr and it's found that lidar ratio of optically thin cirrus is larger than that of thick cirrus.Thin cirrus clouds with ambient temperature below- 45℃ occurr above 8.6 km and its thickness is lower than 1.8 km.The lidar ratio of thin cirrus is between 5 and 69 sr.
In order to understand the spatial and temporal variations of cirrus over semi-arid areas in Northwest of China,macrophysical and optical characteristics of cirrus clouds were observed by micro pulse lidar(MPL-4B) over Semi-Arid Climate and Environment Observatory of Lanzhou University(SACOL,35°57'N,104°8′E).The structures and optical properties of the cirrus clouds as well as their spatial and temporal variations were discussed and analyzed.The results show that cirrus clouds change from thin to thick,observed ranging from 7 to 10 km,with a mean thickness of(2.0 ± 0.5) km.During this period,the samples have temperature between-51℃ and-39℃.The cloud optical depth increases and then decreases with increasing geometrical depth,ranging from 0.084 to 1.649,with a mean value of 0.651 ±0.403.Lidar ratio of cirrus clouds is(17 ± 17) sr and it's found that lidar ratio of optically thin cirrus is larger than that of thick cirrus.Thin cirrus clouds with ambient temperature below- 45℃ occurr above 8.6 km and its thickness is lower than 1.8 km.The lidar ratio of thin cirrus is between 5 and 69 sr.
引文
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[17]Chen W N,Chiang C W,Nee J B.Lidar ratio and depolarization ratio for cirrus clouds[J].Appl.Opt.,2002,41:6470-6476.
[18]Xue Xinlian,Qi Fudi,Fan Aiyuan,et al.A method to determine lidar ratio in high-altitude thin cirrus[J].Chinese Journal of Quantum Electronics(量子电子学报),2006,23(1):115-119(in Chinese).
[19]Wang X,Boselli A,Avino L D,et al.An algorithm to determine cirrus properties from analysis of multiplescattering influence on lidar signals[J].Appl.Phys.B,2005,80:609-615.
[20]Platt C M R,Dilley A C.Remote sounding of high clouds.IV:Observed temperature variations in cirrus optical properties[J].J.Atmos.Sci.,1981,38:1069-1082.
[2]Liou K N.Influence of cirrus clouds on weather and climate processes:a global perspective[J].Mon.Weather Rev.,1986,114:1167-1199.
[3]Twomey S.Aerosols,clouds and radiation[J].Atmos.Environ.,1991,25:2435-2442.
[4]McFarquhar G M,Heymsfield A J,Spinhirne J D,et al.Thin and subvisual tropopause tropical cirrus:observations and radiative impacts[J].J.Atmos.Sci.,2000,57:1841-1853.
[5]Baker B M.Cloud microphysics and climate[J].Science,1997,276:1072-1078.
[6]Ramanathan V,Collins W.Thermodynamic regulation of ocean warming by cirrus clouds deduced from observations of the 1987 El Nino[J].Nature,1991,351:27-32.
[7]Spinhirne J D.Micropluse lidar[J].IEEE Trans.Geosc.Rem.Sens.,1993,31(1):48-54.
[8]Sassen K,Cho B S.Subvisible-thin cirrus lidar dataset for satellite verification and climatological research[J].J.Appl.Mete.,1992,31:1275-1285.
[9]Reichardt J.Optical and geometrical properties of northern midlatitude cirrus clouds observedwith a UV Raman lidar[J].Phys.Chem.Earth,Part B,1999,24:255-260.
[10]Giannakaki E,Balis D S,Amiridis V,et al.Optical and geometrical characteristics of cirrus clouds over a southern European lidar station[J].Atmos.Chem.Phys.,2007,7:5519-5530.
[11]Xue Xinlian,Qi Fudi,Fan Aiyuan,et al.Lidar observations of cirrus clouds over Hefei[J].Chinese Journal of Quantum Electronics(量子电子学报),2006,23(4):527-532(in Chinese).
[12]Platt C M,Young S A,Carswell A I,et al.The experimental cloud lidar pilot study(ECLIPS)for cloud-radiation research[J].Bull.Amer.Meteor.Soc,1994,75:1635-1654.
[13]Klett J D.Stable analytical inversion solution for processing lidar returns[J].Appl.Opt.,1981,20:211-220.
[14]Fernald F G.Analysis of atmospheric lidar observations:Some comment[J].Appl.Opt.,1984,23(5):652-653.
[15]Platt C M R.Lidar and radiometric observation of cirrus clouds[J].J.Atmos.Sci.,1973,30:1191-1204.
[16]Young S A.Analysis of lidar backscatter profiles in optically thin clouds[J].Appl.Opt.,1995,34:7019-7031.
[17]Chen W N,Chiang C W,Nee J B.Lidar ratio and depolarization ratio for cirrus clouds[J].Appl.Opt.,2002,41:6470-6476.
[18]Xue Xinlian,Qi Fudi,Fan Aiyuan,et al.A method to determine lidar ratio in high-altitude thin cirrus[J].Chinese Journal of Quantum Electronics(量子电子学报),2006,23(1):115-119(in Chinese).
[19]Wang X,Boselli A,Avino L D,et al.An algorithm to determine cirrus properties from analysis of multiplescattering influence on lidar signals[J].Appl.Phys.B,2005,80:609-615.
[20]Platt C M R,Dilley A C.Remote sounding of high clouds.IV:Observed temperature variations in cirrus optical properties[J].J.Atmos.Sci.,1981,38:1069-1082.