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- W1994332766 abstract "A new method for the quantitative evaluation of global atmospheric transport and the hydroxyl radical (OH)‐based oxidation in three‐dimensional (3‐D) atmospheric chemistry transport models (CTMs) and general circulation models (GCMs) is developed. The method is based on a cosmogenic 14 CO climatology that has been previously derived from a large number of 14 CO observations. Using 14 CO measurements to constrain model OH distributions and the simulated stratosphere–troposphere exchange (STE) provides a challenging test for 3‐D atmospheric models. Here, the evaluation method is applied to the CTMs MATCH and TM3. Whereas MATCH overestimates the STE in both hemispheres, TM3 does reproduce the STE in the Southern Hemisphere (SH) but underestimates it in the Northern Hemisphere (NH). The STE phase in MATCH is 1 month too early, whereas no significant phase shift for TM3 is revealed. These characteristic deficiencies in both models were consistently determined, i.e., with the same boundary conditions (OH distribution and 14 CO source distribution). The robustness of the results is tested by various sensitivity studies, involving the 14 CO source distribution and strength, the tropospheric OH distribution, the stratospheric OH abundance, and the applied numerical advection scheme. Consistency is further checked by comparison of the model simulated vertical 14 CO profiles to 14 CO observations from a number of aircraft campaigns. The 14 CO simulations do not support an interhemispheric asymmetry in the OH abundance with an on average higher concentration in the SH." @default.
- W1994332766 created "2016-06-24" @default.
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- W1994332766 date "2002-10-27" @default.
- W1994332766 modified "2023-10-18" @default.
- W1994332766 title "Evaluation of stratosphere–troposphere exchange and the hydroxyl radical distribution in three-dimensional global atmospheric models using observations of cosmogenic<sup>14</sup>CO" @default.
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- W1994332766 doi "https://doi.org/10.1029/2001jd001324" @default.
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