We have a new paper that has been published. It is
Herman, Benjamin M.; Brunke, Michael A.; Sr., Roger A. Pielke; Christy, John R.; McNider, Richard T. 2010. “Satellite Global and Hemispheric Lower Tropospheric Temperature Annual Temperature Cycle.” Remote Sens. 2, no. 11: 2561-2570.
The abstract reads
“Previous analyses of the Earth’s annual cycle and its trends have utilized surface temperature data sets. Here we introduce a new analysis of the global and hemispheric annual cycle using a satellite remote sensing derived data set during the period 1979–2009, as determined from the lower tropospheric (LT) channel of the MSU satellite. While the surface annual cycle is tied directly to the heating and cooling of the land areas, the tropospheric annual cycle involves additionally the gain or loss of heat between the surface and atmosphere. The peak in the global tropospheric temperature in the 30 year period occurs on 10 July and the minimum on 9 February in response to the larger land mass in the Northern Hemisphere. The actual dates of the hemispheric maxima and minima are a complex function of many variables which can change from year to year thereby altering these dates. Here we examine the time of occurrence of the global and hemispheric maxima and minima lower tropospheric temperatures, the values of the annual maxima and minima, and the slopes and significance of the changes in these metrics. The statistically significant trends are all relatively small. The values of the global annual maximum and minimum showed a small, but significant trend. Northern and Southern Hemisphere maxima and minima show a slight trend toward occurring later in the year. Most recent analyses of trends in the global annual cycle using observed surface data have indicated a trend toward earlier maxima and minima.”
The conclusion contains the text
“The time of maxima and minima for each hemisphere as noted by Stine et al.  is a complex function of many variables but in the end represents an integrated value of the hemisphere’s thermal inertia and response to forcing. Thus, it appears that dates of maxima and minima provide a metric that can be used to test climate models. The development of observational metrics such as presented here for the troposphere is important to providing a test for climate models on the general response to annual forcing. It is suggested that both surface and the LT annual cycle be studied together along with model simulations.”