Computer Science – Sound
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa14a..05s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA14A-05
Computer Science
Sound
[0305] Atmospheric Composition And Structure / Aerosols And Particles, [0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry, [3334] Atmospheric Processes / Middle Atmosphere Dynamics
Scientific paper
NOGAPS-ALPHA is a research class forecast/analysis system that represents the upward extension (ALPHA: Advanced Level Physics High Altitude) of the Navy’s Operational Global Atmospheric Prediction System to 90 km. We have used the data assimilation component of the system to produce a high altitude analysis product that extends from May 2007 to the fall of 2009. It encompasses the first three northern summer Polar Mesospheric Cloud (PMC) seasons recorded by NASA’s Aeronomy of Ice in the Mesosphere mission, as well as the first two southern seasons. The analysis assimilates research level temperature, water vapor and ozone from NASA’s Sounding of the Atmosphere using Broadband Emission Radiometry experiment and the Microwave Limb Sounder to supplement operational meteorological data. The analysis is useful both as a diagnostic of mesospheric weather and as inputs to microphysical models that can simulate PMCs variations. Here I summarize several salient features of the variability revealed by the analysis. For example, it is clear that the northern summer is colder and more supersaturated than the southern summer. At the same time, it is apparent that the northern summer of 2007 was not as cool as 2008 and 2009. This may be connected to unusually active planetary wave activity in the Southern Hemisphere in 2007 warming the Arctic summer mesosphere through teleconnection. The implications of these interseasonal differences for PMC formation are quantified by performing calculations using the Community Aerosol and Radiation Model for Atmospheres driven by NOGAPS and we compare with concurrent PMC data such as from AIM and from the Spatial Heterodyne Imager for Mesospheric Radicals . In addition, the analyses reveal significant intraseasonal dynamical variability within the cold summer season such as that from the 5 day wave. The effect of this wave on PMCs is also discussed.
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