Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-16915-2018 |
Microphysical characteristics of frozen droplet aggregates from deep convective clouds | |
Um, Junshik1,2; McFarquhar, Greg M.2,3,4; Stith, Jeffrey L.4; Jung, Chang Hoon5; Lee, Seoung Soo6; Lee, Ji Yi7; Shin, Younghwan8; Lee, Yun Gon9; Yang, Yiseok Isaac10; Yum, Seong Soo10; Kim, Byung-Gon11; Cha, JooWan12; Ko, A-Reum12 | |
2018-11-29 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
![]() |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:23页码:16915-16930 |
文章类型 | Article |
语种 | 英语 |
国家 | South Korea; USA |
英文摘要 | During the 2012 Deep Convective Clouds and Chemistry (DC3) experiment the National Science Foundation/National Center for Atmospheric Research Gulfstream V (GV) aircraft sampled the upper anvils of two storms that developed in eastern Colorado on 6 June 2012. A cloud particle imager (CPI) mounted on the GV aircraft recorded images of ice crystals at altitudes of 12.0 to 12.4 km and temperatures (T) from -61 to -55 degrees C. A total of 22 393 CPI crystal images were analyzed, all with maximum dimension (D-max) < 433 mu m and with an average D-max of 80.7 +/- 45.4 mu m. The occurrence of well-defined pristine crystals (e.g., columns and plates) was less than 0.04% by number. Single frozen droplets and frozen droplet aggregates (FDAs) were the dominant habits with fractions of 73.0% (by number) and 46.3 % (by projected area), respectively. The relative frequency of occurrence of single frozen droplets and FDAs depended on temperature and position within the anvil cloud. A new algorithm that uses the circle Hough transform technique was developed to automatically identify the number, size, and relative position of element frozen droplets within FDAs. Of the FDAs, 42.0% had two element frozen droplets with an average of 4.7 +/- 5.0 element frozen droplets. The frequency of occurrence gradually decreased with the number of element frozen droplets. Based on the number, size, and relative position of the element frozen droplets within the FDAs, possible three-dimensional (3-D) realizations of FDAs were generated and characterized by two different shape parameters, the aggregation index (AI) and the fractal dimension (D-f), that describe 3-D shapes and link to scattering properties with an assumption of spherical shape of element frozen droplets. The AI of FDAs decreased with an increase in the number of element frozen droplets, with larger FDAs with more element frozen droplets having more compact shapes. The D-f of FDAs was about 1.20-1.43 smaller than that of black carbon (BC) aggregates (1.53-1.85) determined in previous studies. Such a smaller D-f of FDAs indicates that FDAs have more linear chain-like branched shapes than the compact shapes of BC aggregates. Determined morphological characteristics of FDAs along with the proposed reconstructed 3-D representations of FDAs in this study have important implications for improving the calculations of the microphysical (e.g., fall velocity) and radiative (e.g., asymmetry parameter) properties of ice crystals in upper anvil clouds. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000451580600006 |
WOS关键词 | SINGLE-SCATTERING PROPERTIES ; QUASI-SPHERICAL ICE ; RADIATIVE PROPERTIES ; CIRRUS CLOUDS ; LIGHT-SCATTERING ; ANVIL ; CRYSTALS ; CLIMATE ; SIZE ; STRATOSPHERE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/18369 |
专题 | 地球科学 |
作者单位 | 1.Pusan Natl Univ, Dept Atmospher Sci, Busan, South Korea; 2.Univ Oklahoma, Cooperat Inst Mesoscale Meteorol Studies, Norman, OK 73019 USA; 3.Univ Oklahoma, Sch Meteorol, Norman, OK 73019 USA; 4.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA; 5.Kyungin Womens Univ, Dept Hlth Management, Incheon, South Korea; 6.Earth Syst Sci Interdisciplinary Ctr, College Pk, MD USA; 7.Ewha Womans Univ, Dept Environm Sci & Engn, Seoul, South Korea; 8.Univ Illinois, Dept Agr & Biol Engn, Urbana, IL 61801 USA; 9.Chungnam Natl Univ, Dept Atmospher Sci, Daejeon, South Korea; 10.Yonsei Univ, Dept Atmospher Sci, Seoul, South Korea; 11.Gangneung Wonju Natl Univ, Dept Atmospher & Environm Sci, Kangnung, South Korea; 12.Natl Inst Meteorol Sci, Appl Meteorol Res Div, Jeju, South Korea |
推荐引用方式 GB/T 7714 | Um, Junshik,McFarquhar, Greg M.,Stith, Jeffrey L.,et al. Microphysical characteristics of frozen droplet aggregates from deep convective clouds[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(23):16915-16930. |
APA | Um, Junshik.,McFarquhar, Greg M..,Stith, Jeffrey L..,Jung, Chang Hoon.,Lee, Seoung Soo.,...&Ko, A-Reum.(2018).Microphysical characteristics of frozen droplet aggregates from deep convective clouds.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(23),16915-16930. |
MLA | Um, Junshik,et al."Microphysical characteristics of frozen droplet aggregates from deep convective clouds".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.23(2018):16915-16930. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论