Estimating the Meridional Extent of Adiabatic Mixing in the Stratosphere Using Age‐Of‐Air
Estimating the Meridional Extent of Adiabatic Mixing in the Stratosphere Using Age‐Of‐Air
复制标题
使用空气年龄估计平流层绝热混合的经向范围
DOI:
10.1029/2022jd037712
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Kinnison, Douglas E.
中科院分区:
文献类型:
--
作者:
Gupta, Aman;Linz, Marianna;Curbelo, Jezabel;Pauluis, Olivier;Gerber, Edwin P.;Kinnison, Douglas E.
Wave‐induced adiabatic mixing in the winter midlatitudes is one of the key processes impacting stratospheric transport. Understanding its strength and structure is vital to understanding the distribution of trace gases and their modulation under a changing climate. Age‐of‐air is often used to understand stratospheric transport, and this study proposes refinements to the vertical age gradient theory of Linz et al. (2021), https://doi.org/10.1029/2021JD035199. The theory assumes exchange of air between a well‐mixed tropics and a well‐mixed extratropics, separated by a transport barrier, quantifying the adiabatic mixing flux across the interface using age‐based measures. These assumptions are re‐evaluated and a refined framework that includes the effects of meridional tracer gradients is established to quantify the mixing flux. This is achieved, in part, by computing a circulation streamfunction in age‐potential temperature coordinates to generate a complete distribution of parcel ages being mixed in the midlatitudes. The streamfunction quantifies the “true” age of parcels mixed between the tropics and the extratropics. Applying the revised theory to an idealized and a comprehensive climate model reveals that ignoring the meridional gradients in age leads to an underestimation of the wave‐driven mixing flux. Stronger, and qualitatively similar fluxes are obtained in both models, especially in the lower‐to‐middle stratosphere. While the meridional span of adiabatic mixing in the two models exhibits some differences, they show that the deep tropical pipe, that is, latitudes equatorward of 15° barely mix with older midlatitude air. The novel age‐potential temperature circulation can be used to quantify additional aspects of stratospheric transport.
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DOI:
10.1002/2013jd021294
发表时间:
2014-05
期刊:
Journal of Geophysical Research: Atmospheres
影响因子:
--
作者:
R. Stolarski;D. Waugh;Lei Wang;L. Oman;A. Douglass;P. Newman
通讯作者:
R. Stolarski;D. Waugh;Lei Wang;L. Oman;A. Douglass;P. Newman
影响因子:
6.3
作者:
S. Chabrillat;C. Vigouroux;Y. Christophe;A. Engel;Q. Errera;D. Minganti;B. Monge;A. Segers;E. Mahieu
通讯作者:
E. Mahieu
影响因子:
--
作者:
J. Mahlman;H. Levy;W. Moxim
通讯作者:
W. Moxim
影响因子:
5.2
作者:
M. Abalos;A. de la Cámara
通讯作者:
A. de la Cámara
DOI:
--
发表时间:
1987
期刊:
影响因子:
--
作者:
R. A. Plumb;J. Mahlman
通讯作者:
J. Mahlman