Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa51b0513d&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA51B-0513
Physics
0317 Chemical Kinetic And Photochemical Properties, 0335 Ion Chemistry Of The Atmosphere (2419, 2427), 0340 Middle Atmosphere: Composition And Chemistry
Scientific paper
Nighttime observations of the atmospheric potassium layer were performed at the Arecibo Observatory using lidar to determine the seasonal variation in the concentration of the potassium metal atom layer. The K layer shows nightly and seasonal variation; the nightly variation was due to the presence of sporadic layers. The seasonal variability is less in the layer width, while the column abundance exhibits a semiannual variation. To understand the seasonal behavior of the K layer a one dimensional model has been developed. The model includes a meteoric deposition, vertical transport through eddy diffusion, and a full chemical scheme. To identify molecular reservoirs and sinks for the K atom, ab initio calculations were performed to estimate the thermochemistry. Rate constants for the reaction between the metal bicarbonate and atomic H, as well as ion-molecule reactions, were obtained by considering detailed balance mechanism and transition state theory. Reactions KO+ + N2, K+xO2 + O, K+xO2 + N2, and KHCO3 + H can be considered as routes that may cycle species, which can play a role as major sinks of potassium ion or neutrals in the mesospheric cycle. These studies of the metal layer contribute to a better understanding of chemical and dynamical changes that affect atmospheric composition.
Delgado Rubén
Friedman Joshua S.
Plane J. M.
Weiner Brad R.
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