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http://hdl.handle.net/2122/6237
Authors: | Di Biagio, C.* Muscari, G.* di Sarra, A.* de Zafra, R. L.* Eriksen, P.* Fiocco, G.* Fiorucci, I.* Fuà, D.* |
Title: | Evolution of temperature, O3, CO, and N2O profiles during the exceptional 2009 Arctic major stratospheric warming as observed by lidar and mm-wave spectroscopy at Thule (76.5°N, 68.8°W), Greenland. | Journal: | Journal of Geophysical Research | Series/Report no.: | /115 (2010) | Publisher: | American Geophysical Union | Issue Date: | 2010 | DOI: | 10.1029/2010JD014070 | Keywords: | sudden stratospheric warming winter polar stratosphere temperature O3 N2O CO |
Subject Classification: | 01. Atmosphere::01.01. Atmosphere::01.01.01. Composition and Structure 01. Atmosphere::01.01. Atmosphere::01.01.04. Processes and Dynamics |
Abstract: | The 2009 Arctic sudden stratospheric warming (SSW) was the most intense event of this kind ever observed. Unique ground-based measurements of middle atmospheric profiles for temperature, O3, CO, and N2O obtained at Thule (76.5°N, 68.8°W), Greenland, in the period January – early March are used to show the evolution of the 2009 SSW in the region of its maximum intensity. The first sign of the SSW was detected at θ~2000 K on January 19, when a rapid decrease in CO mixing ratio took place. The first evidence of a temperature increase was observed at the same level on 22 January, the earliest date on which lidar measurements reached above ~50 km. The warming propagated from the upper to the lower stratosphere in 7 days and the record maximum temperature of 289 K was observed between 1300 and 1500 K potential temperature on 22 January. A strong vortex splitting was associated with the SSW. Stratospheric backward trajectories indicate that airmasses arriving to Thule during the warming peak underwent a rapid compression and an intense adiabatic warming of up to 50 K. The rapid advection of air from the extra-tropics was also occasionally observed to produce elevated values of N2O mixing ratio. Starting from mid-February the temperature profile and the N2O mixing ratio returned to the pre-warming values in the mid and upper stratosphere, indicating the reformation of the vortex at these levels. In late winter, vertical descent from starting altitudes of ~60 km is estimated from CO profiles to be 0.25±0.05 km/day. |
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