Some Properties of Deep Stratiform Ice Cloud Revealed by 95 GHz GKSS Cloud Radar : A case study

研究概要:This paper presents a case study of a deep stratiform cloud observed with a 95 GHz polarimetric Doppler radar on 06 Dec., 1995, at Geesthacht, Germany. The levels of echo top and bottom were 〜5.15km (-30℃) and 〜1km (-7℃), respectively. The radar signal contained convective echoes above 〜4.5km, and streaks between 3 and 4.5km. Another thin stratiform radar echo below 2.5km was also observed. The estimated vertical air velocity indicated the existence of wave motion (wavelength 〜3.6km) of air in the streak region. The vertical air velocity showed convective-scale (0.5〜1km) fluctuations in the convective echo region. The general time-trend of vertical air velocity correlated well with the wave motion of air in the lower convective region. The intermittent updraught apparently originated at the crest of the wave. In addition, smaller-scale (<100m) but strong up- and downdraughts were observed near the cloud top, where the bulk Richardson number was 〜1, mainly due to the strong wind shear. Their vertical air velocities did not correlate with the wave motion of air below.

https://opac.ll.chiba-u.jp/da/curator/900022172/

https://opac.ll.chiba-u.jp/da/curator/900022172/C-17_06.pdf

Research Paper

プロシーディング「雲のリモートセンシングと気候影響に関するシンポジウム」

34

41

1998

eng

publisher