HR: 08:00h
AN: SA31A-01 INVITED    [Abstracts]
TI: Greenhouse Cooling in the Mesosphere and Lower Thermosphere (MLT)
AU: * Akmaev, R A
EM: Rashid.Akmaev@noaa.gov
AF: CIRES, Univ. of Colorado, 216 UCB, Boulder, CO 80309,
AU: Emmert, J T
AU: Marcos, F A
AU: Hill, S M
AB: The classical work by Roble and Dickinson (1989) predicted the upper atmosphere to be extremely sensitive to greenhouse forcing resulting primarily in its substantial cooling. Relevant mechanisms, including in-situ radiative forcings, feedbacks, and their uncertainties will be discussed from the modeling perspective. The MLT region is also expected to respond to changes in underlying atmospheric layers, including the stratosphere, in a complex manner presenting certain challenges for interpretation of observations, trend detection and attribution. Atmospheric density has proven to be a robust indicator of global change in the upper atmosphere. Comparisons with current data analyses will be presented and emerging perspectives for long-term monitoring in the MLT briefly discussed.
DE: 1610 Atmosphere (0315, 0325)
DE: 1640 Remote sensing (1855)
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 3369 Thermospheric dynamics (0358)
SC: SPA-Aeronomy [SA]
MN: 2007 Fall Meeting