Concentrations in mountain areas of particles released at low elevations

✍ Scribed by A. Gagin; J. Neumann

• Book ID: 104574110
• Publisher: John Wiley and Sons
• Year: 1970
• Tongue: English
• Weight: 252 KB
• Volume: 96
• Category: Article
• ISSN: 0035-9009
• DOI: 10.1002/qj.49709640914

✦ Synopsis

Abstract

Concentrations in the air of ice nuclei active at − 15°C have been measured in Jerusalem, Israel. It is found that the highest concentrations occur almost always on days when the mixing depth in the lower atmosphere over the coastal area to the west reaches Jerusalem's elevation (750–830 m) or an elevation not exceeding a few hundred metres above it. Most of the high concentrations and the mixing depths of about 1,000 m occur in the warm season when a low‐level subsidence inversion is a near‐permanent feature of the atmosphere.

The results are consistent with the hypothesis that most of the particles originate in low‐level areas upwind of the city having been carried up to Jerusalem's altitude mainly by vertical mixing.