Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-7703-2017 |
Effects of mixing on resolved and unresolved scales on stratospheric age of air | |
Dietmueller, Simone1; Garny, Hella1; Ploeger, Felix2; Joeckel, Patrick1; Cai, Duy1 | |
2017-06-26 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
![]() |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:12 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | Mean age of air (AoA) is a widely used metric to describe the transport along the Brewer-Dobson circulation. We seek to untangle the effects of different processes on the simulation of AoA, using the chemistry-climate model EMAC (ECHAM/MESSy Atmospheric Chemistry) and the Chemical Lagrangian Model of the Stratosphere (CLaMS). Here, the effects of residual transport and two-way mixing on AoA are calculated. To do so, we calculate the residual circulation transit time (RCTT). The difference of AoA and RCTT is defined as aging by mixing. However, as diffusion is also included in this difference, we further use a method to directly calculate aging by mixing on resolved scales. Comparing these two methods of calculating aging by mixing allows for separating the effect of unresolved aging by mixing (which we term "aging by diffusion" in the following) in EMAC and CLaMS. We find that diffusion impacts AoA by making air older, but its contribution plays a minor role (order of 10 %) in all simulations. However, due to the different advection schemes of the two models, aging by diffusion has a larger effect on AoA and mixing efficiency in EMAC, compared to CLaMS. Regarding the trends in AoA, in CLaMS the AoA trend is negative throughout the stratosphere except in the Northern Hemisphere middle stratosphere, consistent with observations. This slight positive trend is neither reproduced in a free-running nor in a nudged simulation with EMAC - in both simulations the AoA trend is negative throughout the stratosphere. Trends in AoA are mainly driven by the contributions of RCTT and aging by mixing, whereas the contribution of aging by diffusion plays a minor role. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000404403900003 |
WOS关键词 | BREWER-DOBSON CIRCULATION ; RESIDUAL CIRCULATION ; MEAN AGE ; TRANSPORT ; CLIMATE ; MODEL ; SENSITIVITY ; CORE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/20609 |
专题 | 地球科学 |
作者单位 | 1.Deutsch Zentrum Luft & Raumfahrt DLR, Inst Phys Atmosphare, Oberpfaffenhofen, Germany; 2.Forschungszentrum Julich, Inst Energy & Climate Res IEK 7, Julich, Germany |
推荐引用方式 GB/T 7714 | Dietmueller, Simone,Garny, Hella,Ploeger, Felix,et al. Effects of mixing on resolved and unresolved scales on stratospheric age of air[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(12). |
APA | Dietmueller, Simone,Garny, Hella,Ploeger, Felix,Joeckel, Patrick,&Cai, Duy.(2017).Effects of mixing on resolved and unresolved scales on stratospheric age of air.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(12). |
MLA | Dietmueller, Simone,et al."Effects of mixing on resolved and unresolved scales on stratospheric age of air".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.12(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论