Friday, August 9, 2013
New paper finds another potential solar amplification mechanism
A new paper published in the Journal of Atmospheric and Solar-Terrestrial Physics finds that polar Sudden Stratospheric Warmings [SSWs] cause strong cooling near the surface of the entire tropics. Sudden Stratospheric Warmings have in turn been associated either directly or indirectly to solar activity [via solar effects on stratospheric winds]. According to the authors, "The study reveals the presence of a strong cooling in the entire tropics (30°N- 30°S) associated with sudden stratospheric warmings" and "The near-surface (1000 hPa) temperature anomalies are also found to decrease during the peak of warming. A tropical upwelling is started in the tropical tropospheric layers prior to the peak of warming. The above upwelling induces a marked decrease in temperatures at 1000 hPa [near-surface] level." The paper may demonstrate yet another amplification mechanism by which tiny changes in solar activity can be amplified to produce large effects upon surface temperature.
Posted by MS at 11:47 AM