期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 45, 页码 18897-18901出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0907988106
关键词
aerosol; clouds; aqueous; inorganic
资金
- National Science Foundation [0639847]
- U. S. Department of Energy [AC02-05CH11231]
- Directorate For Geosciences [0639847] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences [0639847] Funding Source: National Science Foundation
Aqueous evaporation and condensation kinetics are poorly understood, and uncertainties in their rates affect predictions of cloud behavior and therefore climate. We measured the cooling rate of 3 M ammonium sulfate droplets undergoing free evaporation via Raman thermometry. Analysis of the measurements yields a value of 0.58 +/- 0.05 for the evaporation coefficient, identical to that previously determined for pure water. These results imply that subsaturated aqueous ammonium sulfate, which is the most abundant inorganic component of atmospheric aerosol, does not affect the vapor-liquid exchange mechanism for cloud droplets, despite reducing the saturation vapor pressure of water significantly.
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