Details

Autor(en) / Beteiligte

• She, C-Y
• Krueger, DA
• Akmaev, R
• Schmidt, H
• Talaat, E
• Yee, S

Titel

Long-term variability in mesopause region temperatures over Fort Collins, Colorado (41 super(o)N, 105 super(o)W) based on lidar observations from 1990 through 2007

Ist Teil von

• Journal of atmospheric and solar-terrestrial physics, 2009-10, Vol.71 (14-15), p.1558-1564

Erscheinungsjahr

2009

Quelle

ScienceDirect

Beschreibungen/Notizen

• During 1990-2007, there were 894 lidar observations of nocturnal mesopause region temperatures over Fort Collins, Colorado. In an earlier analysis with data to April 1997, an unexpected episodic warming, peaking in 1993 with a maximum value over 10K, was reported and attributed to the Mount Pinatubo eruption in June 1991. With all data, long-term temperature trends from a 7-parameter linear regression analysis including solar cycle effect and long-term trends leads to a cooling of as much as 6.8K/decade at ~100km, consistent with some reported observations but larger than model predictions. Including the observed episodic warming response in an 11-parameter nonlinear regression analysis reduces the maximum long-term cooling trends to arrow right .5K/decade at 91km, with magnitude and altitude dependences consistent with the prediction of two models, Spectral Mesosphere/Lower Thermosphere Model (SMLTM) and Hamburg Model of the Neutral and Ionized Atmosphere (HAMMONIA). In addition, the mid-latitude middle-atmospheric response to solar flux variability in Thermosphere-Ionosphere-Energetics and Dynamics (TIMED)/Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperatures is presented.