The PMC Mass for the 2007 Northern Summer: Results From a Microphysical Model Driven by a Data Assimilation System

Details The PMC Mass for the 2007 Northern Summer: Results From a Microphysical Model Driven by a Data Assimilation System The PMC Mass for the 2007 Northern Summer: Results From a Microphysical Model Driven by a Data Assimilation System

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa43a1560s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA43A-1560

Physics

0320 Cloud Physics And Chemistry, 0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 3311 Clouds And Aerosols, 3349 Polar Meteorology

Scientific paper

An Advanced-Level Physics High-Altitude (ALPHA) prototype of the Navy Operational Global Atmospheric Prediction System (NOGAPS) has recently been extended into the upper mesosphere, providing synoptic analysis fields in support of NASA's Aeronomy of Ice in the Mesosphere (AIM) mission. Microphysical model results have indicated that temperature (T) and water vapor (H2O) are critical to the calculation of the polar mesospheric cloud (PMC) ice mass. NOGAPS-ALPHA assimilates T up to ~88 km altitude from NASA's Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) and Microwave Limb Sounder (MLS) satellite experiments and H2O mixing ratios to the same height from MLS for the 2007 northern summer. The analyzed T and H2O fields provide a measure of the local saturation, which strongly correlates with PMC occurrence observed independently by the Solar Occultation For Ice Experiment (SOFIE) on AIM. Motivated by this fact, we seek to quantify the relationship between the mesospheric environment (T, H2O) and the PMC mass. Our approach is to use time-dependent output from NOGAPS-ALPHA in the one-dimensional Community Aerosol and Radiation Model for Atmospheres (CARMA) to simulate the microphysics and compare the results directly to SOFIE observations. We will focus primarily on the PMC mass during the 2007 northern summer and its sensitivity to available nucleation sites. Although meteoric smoke is regarded as the most likely nucleation site for PMCs, recent results from global climate models indicate that the distribution of meteoric smoke in the polar summer mesosphere is significantly less than expected. We will explore the sensitivity of our results to variations in concentrations of meteoric smoke and identify what is needed to reproduce the SOFIE observations.

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