期刊文献+

Relationship between Cloud Characteristics and Radar Reflectivity Based on Aircraft and Cloud Radar Co-observations 被引量:3

Relationship between Cloud Characteristics and Radar Reflectivity Based on Aircraft and Cloud Radar Co-observations
下载PDF
导出
摘要 Cloud properties were investigated based on aircraft and cloud radar co-observation conducted at Yitong, Jilin, Northeast China. The aircraft provided in situ measurements of cloud droplet size distribution, while the millimeter-wavelength cloud radar vertically scanned the same cloud that the aircraft penetrated. The reflectivity factor calculated from aircraft measurements was compared in detail with sinmltaneous radar observations. The results showed that the two reflectivities were comparable in warm clouds, but in ice cloud there were more differences, which were probably associated with the occurrence of liquid water. The acceptable agreement between reflectivities obtained in water cloud confirmed that it is feasible to derive cloud properties by using aircraft data, and hence for cloud radar to remotely sense cloud properties. Based on the dataset collected in warm clouds, the threshold of reflectivity to diagnose drizzle and cloud particles was studied by analyses of the probability distribution function of reflectivity from cloud particles and drizzle drops. The relationship between refiectivity factor (Z) and cloud liquid water content (LWC) was also derived from data on both cloud particles and drizzle. In comparison with cloud droplets, the relationship for drizzle was blurred by many scatter points and thus was less evident. However, these scatters could be partly removed by filtering out the drop size distribution with a large ratio of reflectivity and large extinction coefficient but small effective radius. Empirical relationships of Z-LWC for both cloud particles and drizzle could then be derived. Cloud properties were investigated based on aircraft and cloud radar co-observation conducted at Yitong, Jilin, Northeast China. The aircraft provided in situ measurements of cloud droplet size distribution, while the millimeter-wavelength cloud radar vertically scanned the same cloud that the aircraft penetrated. The reflectivity factor calculated from aircraft measurements was compared in detail with sinmltaneous radar observations. The results showed that the two reflectivities were comparable in warm clouds, but in ice cloud there were more differences, which were probably associated with the occurrence of liquid water. The acceptable agreement between reflectivities obtained in water cloud confirmed that it is feasible to derive cloud properties by using aircraft data, and hence for cloud radar to remotely sense cloud properties. Based on the dataset collected in warm clouds, the threshold of reflectivity to diagnose drizzle and cloud particles was studied by analyses of the probability distribution function of reflectivity from cloud particles and drizzle drops. The relationship between refiectivity factor (Z) and cloud liquid water content (LWC) was also derived from data on both cloud particles and drizzle. In comparison with cloud droplets, the relationship for drizzle was blurred by many scatter points and thus was less evident. However, these scatters could be partly removed by filtering out the drop size distribution with a large ratio of reflectivity and large extinction coefficient but small effective radius. Empirical relationships of Z-LWC for both cloud particles and drizzle could then be derived.
出处 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2013年第5期1275-1286,共12页 大气科学进展(英文版)
基金 supported by the National Key Program for Developing Basic Sciences under Grant 2012CB417202 the National Natural Science Foundation of China under Grant Nos. 40975014, 41030962 and 41175038 sponsored by the Program for Postgraduates Research Innovation of Jiangsu Higher Education Institutions (Grant No. CXZZ11-0615)
关键词 AIRCRAFT millimeter wavelength cloud radar droplet size distribution REFLECTIVITY liquid water content aircraft, millimeter wavelength cloud radar, droplet size distribution, reflectivity, liquid water content
  • 引文网络
  • 相关文献

参考文献30

  • 1Baedi, R., J. J. M. de Wit, H. W. J. Russchenberg, J. S. Erkelens, and J. P. V. Poiares Baptista, 2000: Estimating effective radius and liquid water content from radar and lidar based on the CLARE98 data- set. Phys. Chem. Earth (B), 25(10 12), 1057-1062.
  • 2Baumgardner, D., H. Jonsson, W. Dawson, D. O'Connor and R. Newton, 2001: The cloud, aerosol and pre- cipitation spectrometer: A new instrument for cloud investigations. Atmospheric Research, 59-60, 251-264.
  • 3Brown, P. R. A., and A. J. Illingworth, 1995: The role of spacebome millimeter-wave radar in the global mon- itoring of ice cloud. J. Appl. Meteor., 34, 2346-2366.
  • 4Chin, H. N. S., D. J. Rodriguez, R. T. Cederval, C. C. Chuang, A. S. Grossman, and J. J. Yio, 2000: A mi- crophysical retrieval scheme for continental low-level stratiform clouds: Impacts of subadiabatic character on microphysical properties and radiation budgets. Mon. Wea. Rev., 128, 2511-2527.
  • 5Cober, S. G., J. W. Strapp, and G. A. Isaac, 1996: An example of supercooled drizzle drops formed through a collision-coalescence process. J. Appl. Meteor., 35, 2250-2260.
  • 6Comstock, K. K., C. S. Bretherton, and S. E. Yuter, 2005: Mesoscale variability and drizzle in Southeast Pacific stratocumulus. J. Atrnos. Sci., 62, 3792-3807.
  • 7Deng, Z. Z., C. S. Zhao, Q. Zhang, M. Y. Huang, and X. C. Ma, 2009: Statistical analysis of microphysi- eal properties and the parameterization of effective radius of warm clouds in Beijing area. Atmospheric Research. 93. 888-896.
  • 8Ellis, S. M., and J. Vivekanandan, 2011: Liquid water content estimates using simultaneous S and Ka band radar measurements. Radio Sci., 46, RS2021, doi: 10.1029/2010RS004361.
  • 9Fox, N. I., and A. J. Illingworth, 1997: The retrieval of stratocumulus cloud properties by ground-based cloud radar, d. Appl. Meteor., 36, 485-492.
  • 10French, J. R., G. Vali, and R. D. Kelly, 2000: Observa- tions of microphysics pertaining to the development of drizzle in warm, shallow cumulus clouds. Quart. d. Roy. Meteor. Soc., 126, 415-443.

同被引文献25

引证文献3

二级引证文献8

;
使用帮助 返回顶部