NDLI: Improved Simulation of the Antarctic Stratospheric Final Warming by Modifying the Orographic Gravity Wave Parameterization in the Beijing Climate Center Atmospheric General Circulation Model

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Improved Simulation of the Antarctic Stratospheric Final Warming by Modifying the Orographic Gravity Wave Parameterization in the Beijing Climate Center Atmospheric General Circulation Model

Content Provider	MDPI
Author	Lu, Yixiong Wu, Tongwen Xu, Xin Zhang, Li Chu, Min
Copyright Year	2020
Description	The Antarctic stratospheric final warming (SFW) is usually simulated with a substantial delay in climate models, and the corresponding temperatures in austral spring are lower than observations, implying insufficient stratospheric wave drag. To investigate the role of orographic gravity wave drag (GWD) in modeling the Antarctic SFW, in this study the orographic GWD parameterization scheme is modified in the middle-atmosphere version of the Beijing Climate Center Atmospheric General Circulation Model. A pair of simulations are conducted to compare two orographic GWD schemes in simulating the breakdown of the stratospheric polar vortex over Antarctica. The control simulation with the default orographic GWD scheme exhibits delayed vortex breakdown and the cold-pole bias seen in most climate models. In the simulation with modified orographic GWD scheme, the simulated vortex breaks down earlier by 8 days, and the associated cold-pole bias is reduced by more than 2 K. The modified scheme provides stronger orographic GWD in the lower stratosphere, which drives an accelerated polar downwelling branch of the Brewer–Dobson circulation and, in turn, produces adiabatic warming. Our study suggests that modifying orographic GWD parameterizations in climate models would be a valid way of improving the SFW simulation over Antarctica.
Starting Page	576
e-ISSN	20734433
DOI	10.3390/atmos11060576
Journal	Atmosphere
Issue Number	6
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2020-06-01
Access Restriction	Open
Subject Keyword	Atmosphere Atmospheric Sciences Antarctic Stratospheric Final Warming Cold-pole Bias Brewer-dobson Circulation Orographic Gravity Wave Parameterization Middle-atmosphere Model
Content Type	Text
Resource Type	Article

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