95 GHz polarimetric radar measurements in a cloud compared with model computations

被引：6

作者：

Aydin, K. ^{[1
]}

Tang, C. ^{[1
]}

Pazmany, A. ^{[2
]}

Mead, J. ^{[2
]}

McIntosh, R. ^{[2
]}

Hervig, M. ^{[3
]}

Kelly, R. ^{[3
]}

Vali, G. ^{[3
]}

机构：

[1] Penn State Univ, Dept Elect Engn, Commun & Space Sci Lab, University Pk, PA 16802 USA

[2] Univ Massachusetts, Dept Elect & Comp Engn, Microwave Remote Sensing Lab, Amherst, MA 01003 USA

[3] Univ Wyoming, Dept Atmospher Sci, Laramie, WY 82071 USA

来源：

ATMOSPHERIC RESEARCH | 1994年 / 34卷 / 1-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0169-8095(94)90085-X

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

The first 95 GHz polarimetric radar measurements obtained in an ice-crystal cloud are presented together with model computations. The radar measurements consist of the horizontal and vertical polarization reflectivity factors (Z(HH) and Z(vv)) and degrees of polarization (DPH and DPV). Simultaneous shadow image measurements of ice crystals are obtained from a 2D-C probe in a closely located wind tunnel. These images provide the size distribution and shape information for the models. The ice crystals are mainly composed of stellar and hexagonal plates. The finite difference time domain method is used for electromagnetic scattering computations. A three dimensional canting distribution is incorporated in the study. The simulated Z(HH) values compare very well with the radar measurements (i.e., the mean values are within 1 dB). Z(VV) also compares well for a specific canting distribution as do the mean values of DPH, DPV and Z(DR) (differential reflectivity). It is observed that Z(HH) (unlike Z(VV)) is not very sensitive to the orientation of planar crystals, but it is sensitive to the change in their thickness. Hence, Z(HH) is a preferable radar measurand for estimating ice crystal mass.

引用

页码：135 / 144

页数：10

共 19 条

[1]

[Anonymous], 2011, MICROPHYSICS CLOUDS

[2]

AUER AH, 1970, J ATMOS SCI, V27, P919, DOI 10.1175/1520-0469(1970)027<0919:TDOICI>2.0.CO

[3]

[4] MILLIMETER-WAVE SCATTERING AND PROPAGATION IN RAIN - A COMPUTATIONAL STUDY AT 94 AND 140 GHZ FOR OBLATE SPHEROIDAL AND SPHERICAL RAINDROPS [J].

AYDIN, K ;

LURE, YM .

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1991, 29 (04) :593-601

[5]

Aydin K., 1992, P 11 C CLOUDS PREC 1, P1025

[6]

BOHREN CF, 1986, J ATMOS SCI, V43, P468, DOI 10.1175/1520-0469(1986)043<0468:AOEMTT>2.0.CO

[7]

[8]

Goldstein H., 1964, CLASSICAL MECH

[9]

Hervig M., 1992, 11 INT C CLOUDS PREC, P1040

[10]

Lhermitte R., 1987, Journal of Atmospheric and Oceanic Technology, V4, P36, DOI 10.1175/1520-0426(1987)004<0036:AGDRFC>2.0.CO

← 1 2 →