TY - JOUR
T1 - Cloud condensation nuclei concentrations in Southern Arizona
T2 - Instrumentation and early observations
AU - Philippin, S.
AU - Betterton, E. A.
N1 - Funding Information:
We are extremely grateful to Dr. S. Twomey and Dr. D. Huffman for valuable discussions and contributions to this study. We would also like to thank Brian Barbaris, Mike Leuthold, Richard Milliron, Keith Nelson, John Pattison, and Dennis Sundie for their technical assistance and support. This research was supported by NOAA/AMP/Cooperative Agreement IGA 9 l-61 l-189-1085, and the Arizona Department of Water Resources.
PY - 1997/3
Y1 - 1997/3
N2 - During an ongoing study to measure cloud condensation nuclei (CCN) concentrations, a new automated thermal diffusion CCN counter was operated during the months January through June 1994 near the summit of Mt. Lemmon in the Catalina Mountains at about 2700 m elevation. The instrument records data continuously at 5-minute intervals 24 hours a day. The status of the instrument and the data are monitored remotely by telephone modem. For the 123-day, continuous study the average CCN concentration was found to range between a few tens and a few hundred nuclei per cm3 at supersaturations between 0.3 and 0.7%. Diurnal variations were observed, as well as other possible influences, such as wind speed, wind direction and mixing depth. At a constant supersaturation of 0.35% the CCN concentration is typically on the order of 50 to 150 nuclei per cm3. A description of the instrumentation and early observations are presented and discussed.
AB - During an ongoing study to measure cloud condensation nuclei (CCN) concentrations, a new automated thermal diffusion CCN counter was operated during the months January through June 1994 near the summit of Mt. Lemmon in the Catalina Mountains at about 2700 m elevation. The instrument records data continuously at 5-minute intervals 24 hours a day. The status of the instrument and the data are monitored remotely by telephone modem. For the 123-day, continuous study the average CCN concentration was found to range between a few tens and a few hundred nuclei per cm3 at supersaturations between 0.3 and 0.7%. Diurnal variations were observed, as well as other possible influences, such as wind speed, wind direction and mixing depth. At a constant supersaturation of 0.35% the CCN concentration is typically on the order of 50 to 150 nuclei per cm3. A description of the instrumentation and early observations are presented and discussed.
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U2 - 10.1016/S0169-8095(96)00046-4
DO - 10.1016/S0169-8095(96)00046-4
M3 - Article
AN - SCOPUS:0030724914
VL - 43
SP - 263
EP - 275
JO - Journal de Recherches Atmospheriques
JF - Journal de Recherches Atmospheriques
SN - 0169-8095
IS - 3
ER -