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Subvisual cirrus cloud observations using a 1064‐nm lidar, a 95 GHz cloud radar, and radiosondes in the warm pool region
Author(s) -
Iwasaki Suginori,
Tsushima Yoko,
Shirooka Ryuichi,
Katsumata Masaki,
Yoneyama Kunio,
Matsui Ichiro,
Shimizu Atsushi,
Sugimoto Nobuo,
Kamei Akihide,
Kuroiwa Hiroshi,
Kumagai Hiroshi,
Okamoto Hajime
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl019377
Subject(s) - radiosonde , cirrus , effective radius , lidar , radius , meteorology , radar , terminal velocity , cloud height , atmospheric sciences , environmental science , physics , cloud computing , remote sensing , geology , astrophysics , cloud cover , mechanics , operating system , telecommunications , computer science , computer security , galaxy
We performed synergy observation of subvisual cirrus clouds (SVC) with 1064‐nm lidar, 95‐GHz cloud radar and radiosondes launched every 3 hours at 2°N, 138°E for one month from 9 November to 9 December 2001. The estimated effective radius r eff of SVC is 9–16 μm (5–9 μm in mode radius). This assumes that the shape of cloud particles is spherical and the number concentration of the particles is 10 5 m −3 . SVC disappear when temperature anomalies exceed +1.5°C. The fall velocity of SVC is same as the downward velocity of the phase propagation of the Kelvin wave, and the terminal velocity of hexagonal particles. Thus sedimentation and phase propagation are important for dissipation of SVC. In addition, it was noted that SVC tended to disappear at midday during the observational period except on 27 November 2001.