Wind observation around the tops of the midlatitude cirrus by the MU radar and Raman-Mie lidarReportar como inadecuado

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Earth, Planets and Space

, Volume 61, Issue 7, pp e33–e36

First Online: 07 August 2009Received: 27 August 2008Revised: 16 July 2009Accepted: 18 July 2009


Using a 46.5-MHz atmospheric radar referred to as the MU radar MUR and a Raman-Mie lidar installed at the Shigaraki 34°51′N, 136°06′E, continuous wind motions around the tops of the midlatitude cirrus are described for the first time. The cloud system extended from the northeast to southwest 35°N-50°N along the eastward-moving trough and passed over Shigaraki in the nighttime between 5–6 November 2004. Cloud-top altitude observed by the lidar was located at ∼10.6 km around 1900 LST 5 November, then gradually descended to ∼8.4 km around 0500 LST 6 November. The westerly wind observed by MUR with 12-min and 150-m resolutions showed a rapid increase with altitude around the cloud tops and was almost always larger than 25 m s above ∼1 km higher than the cloud tops. Objective reanalysis showed that a subtropical jet whose core existed to the south of Shigaraki caused a synoptic-scale vertical increase in the westerly wind around the cloud tops. Radiosondes observed a significant vertical increase of potential temperature greater than 4 K within several hundred meters around the cloud tops. MUR successfully observed fine time and altitude variations of winds which showed a good correspondence with the descending cloud tops.

Key wordsRadar lidar cirrus  Download to read the full article text

Autor: Masayuki K. Yamamoto - Toyohisa Kishi - Takuji Nakamura - Noriyuki Nishi - Mamoru Yamamoto - Hiroyuki Hashiguchi - Shoichir


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