Sensitivity of the surface responses of an idealized AGCM to the timing of imposed ozone depletion‐like polar stratospheric cooling
| Autor: | R. Alan Plumb, Aditi Sheshadri |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010504 meteorology & atmospheric sciences
Mode (statistics) Empirical orthogonal functions 010502 geochemistry & geophysics Atmospheric sciences 01 natural sciences Ozone depletion Geophysics General Circulation Model Climatology Radiative transfer General Earth and Planetary Sciences Polar Climate model Sensitivity (control systems) 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Research Letters. 43:2330-2336 |
| ISSN: | 1944-8007 0094-8276 |
| DOI: | 10.1002/2016gl067964 |
| Popis: | An idealized atmospheric general circulation model (AGCM) is used to investigate the sensitivity of model responses to the timing of imposed polar stratospheric cooling, intended to mimic the radiative effects of ozone depletion. The model exhibits circulation responses to springtime cooling that qualitatively match both observations and the responses of comprehensive chemistry climate models. The model's surface response is sensitive to the timing of the cooling, with the onset becoming delayed with later cooling, but with the termination occurring at similar times, suggesting that the meteorology plays an important role. The model's responses do not match the latitudinal structure of the leading annular mode; rather, the response described by the second empirical orthogonal function plays a substantial role, in addition to the first. It is suggested that the imposed cooling, when it delays the final warming, results in an extended period of lower stratospheric variability, which could be an important factor in producing realistic surface responses. |
| Databáze: | OpenAIRE |
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