Recent Observations of Freezing Nuclei Variations at Ground Level

  1. Helmut Weickmann
  1. Dwight B. Kline

Published Online: 18 MAR 2013

DOI: 10.1029/GM005p0240

Physics of Precipitation: Proceedings of the Cloud Physics Conference, Woods Hole, Massachusetts, June 3-5, 1959

Physics of Precipitation: Proceedings of the Cloud Physics Conference, Woods Hole, Massachusetts, June 3-5, 1959

How to Cite

Kline, D. B. (1960) Recent Observations of Freezing Nuclei Variations at Ground Level, in Physics of Precipitation: Proceedings of the Cloud Physics Conference, Woods Hole, Massachusetts, June 3-5, 1959 (ed H. Weickmann), American Geophysical Union, Washington D. C.. doi: 10.1029/GM005p0240

Author Information

  1. U.S. Weather Bureau, Washington 25, D.C.

Publication History

  1. Published Online: 18 MAR 2013
  2. Published Print: 1 JAN 1960

Book Series:

  1. Geophysical Monograph Series

Book Series Editors:

  1. Waldo E. Smith

ISBN Information

Print ISBN: 9780875900056

Online ISBN: 9781118668931

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Keywords:

  • Cloud-chamber temperature;
  • Freezing nuclei variations;
  • Rapid-expansion technique;
  • Sea-water aerosols;
  • Temperature-spectrum concentrations

Summary

Daily observations of freezing nuclei in the vicinity of Washington, D.C., during the period January 11–March 31, 1959, using a rapid-expansion technique, show indications of appreciable differences with respect to air-mass history. There was evidence of a pronounced tendency for the unusually high counts to occur in air with a recent marine fetch, while air with an extended continental trajectory characteristically showed lower concentrations of ice-forming nuclei in the subfreezing temperature ranges warmer than about −25°C. Some exploratory tests indicate that ocean water could be a source of freezing nuclei, as measured by the expansion technique.