Wind observation around the tops of the midlatitude cirrus by the MU radar and Raman/Mie lidar

Details Wind observation around the tops of the midlatitude cirrus by the MU radar and Raman/Mie lidar Wind observation around the tops of the midlatitude cirrus by the MU radar and Raman/Mie lidar

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ep%26s...61e..33y&link_type=abstract

Earth, Planets and Space, Volume 61, p. e33-e36.

Physics

1

Scientific paper

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-1 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.

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