文档介绍：Solar aspects of papers
27-day Solar Cycle in MLS Temperature: A Synthesis of Statistical Approach
King-Fai Li1, Mao-Chang Liang2,3, Charles D. Camp4, Yuk L. Yung1
1 Division of Geological and ary Sciences, California Institute of Technology, Pasadena, California, USA.
2 Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan.
3 Graduate Institute of Astronomy, National Central University, Jhongli City, Taiwan.
4 California Polytechnic State University, San Luis Obispo, California, USA.
Abstract
We report a 27-day solar cycle in the stratospheric temperature observed by the Microwave Limb Sounder/Aura (MLS). The Monte-Carlo Empirical Mode position (MCEMD) was employed to filter out the seasonal cycles and irrelevant periodicities in the time series. The meridional spatial pattern and the temporal variation of the temperature response were studied posite mean difference (CMD) approach. A statistically significant spatial response of the 27-day solar cycle was obtained for the first time. An increased temperature of – K during the 27-day solar maximum relative to the 27-day solar minimum was observed in the tropical stratosphere and lower mesosphere, where the solar heating due to ozone absorption is dominant. In the mesosphere, a decreased temperature of - K was observed at the equator, companioned by a strong temperature increase (> K) at high latitudes. There was a general agreement in the pared to the previous study from the ERA-40 reanalysis data. We pared the observation with simulations from chemistry climate models and found good agreement, except that the temperature decrease in the equatorial mesosphere was not simulated in the models. No statistically significant global phase lag against solar forcing was found.
1. Introduction
Whether the solar cycle has important impacts on the current climate remains as one of the most controversial issues in munity (1-3). heless, it is sometimes used to test the climate sen