Mathematics – Probability
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa41a1554r&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA41A-1554
Mathematics
Probability
3300 Atmospheric Processes, 3332 Mesospheric Dynamics, 3360 Remote Sensing, 3364 Synoptic-Scale Meteorology, 3384 Acoustic-Gravity Waves
Scientific paper
One of the debated questions is the generation mechanism of convective rolls that have been studied using models and sodium lidar observations in the past. These studies have revealed strong overturning events in the bottom side of the Na layer. The earlier work has suggested that overturning in the Na density occurs before the gravity waves become unstable. Therefore, such Na density overturning may not be a good indication of unstable layers as the background atmosphere may still be stable during the events. Na mixing ratio and potential temperature appear to be a good indicator of atmosphere instability. Also, the earlier work has focused on measurements either from one location or single metal observations. Thus, it is important to look into this phenomenon in more details by combining additional data sets. The primary objective of the current research work is to characterize the convective rolls from four different locations with different latitudes or longitudes: Maui (20.7° N, 156.3° W), Arecibo (18.35° N, 66.75 ° W), SOR (35° N, 106.5° W), and Kyoto (35° N, 136° E). We will also examine the convective rolls in other metals than sodium. In order to characterize the properties of the events, we will investigate all three parameters: metal density, mixing ratio and potential temperature. Considering that there is a correlation between the convective instability and the occurrence of the overturning events, we expect that the latitudinal differences in the temperature should affect the occurrence probability of such events. In addition, this work intends to facilitate a better understanding of the occurrence of these events at the topside of the metal layer.
Chu Xiaoyong
Ejiri Masaki
Friedman Jeffrey F.
Kawahara Takayuki
Nakamura Takashi
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