Measurements of Transformations in the Physical and Chemical Properties of Clouds Associated with Onshore Flow in Washington State

Dean A. Hegg Atmospheric Sciences Department, University of Washington, Seattle, WA 98195

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Lawrence F. Radke Atmospheric Sciences Department, University of Washington, Seattle, WA 98195

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Peter V. Hobbs Atmospheric Sciences Department, University of Washington, Seattle, WA 98195

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Abstract

Preliminary measurements of several physical and chemical parameters associated with clouds in two cases of onshore flow over western Washington suggest that the physical and chemical properties of maritime, cloudy air passing over this region change over relatively small spatial and temporal scales (∼100–200 km, and 5- 15 h, respectively). These scales are similar to those for changes in precipitation chemistry in this region. This tentative conclusion concerning the scales for air mass changes differs from the assumption usually made concerning air mass characteristics and transport distances in the eastern United States.

Abstract

Preliminary measurements of several physical and chemical parameters associated with clouds in two cases of onshore flow over western Washington suggest that the physical and chemical properties of maritime, cloudy air passing over this region change over relatively small spatial and temporal scales (∼100–200 km, and 5- 15 h, respectively). These scales are similar to those for changes in precipitation chemistry in this region. This tentative conclusion concerning the scales for air mass changes differs from the assumption usually made concerning air mass characteristics and transport distances in the eastern United States.

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