Fast Transport Pathways Into the Northern Hemisphere Upper Troposphere and Lower Stratosphere During Northern Summer

被引:11
|
作者
Wu, Yutian [1 ]
Orbe, Clara [2 ]
Tilmes, Simone [3 ]
Abalos, Marta [4 ]
Wang, Xinyue [5 ]
机构
[1] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA
[2] NASA, Goddard Inst Space Studies, New York, NY 10025 USA
[3] Natl Ctr Atmospher Res, Atmospher Chem Observat & Modeling Lab, POB 3000, Boulder, CO 80307 USA
[4] Univ Complutense Madrid, Earth Phys & Astrophys Dept, Madrid, Spain
[5] Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA
基金
美国国家科学基金会;
关键词
ASIAN MONSOON ANTICYCLONE; TROPICAL LOWER STRATOSPHERE; QUASI-BIENNIAL OSCILLATION; BOUNDARY-LAYER SOURCES; TRANSIT-TIME; INTERANNUAL VARIABILITY; CLIMATE SIMULATIONS; SHALLOW CONVECTION; TRACER TRANSPORT; WATER-VAPOR;
D O I
10.1029/2019JD031552
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
This study identifies the fast (i.e., similar to days-weeks) transport pathways that connect the Northern Hemisphere surface to the upper troposphere and lower stratosphere (UTLS) during northern summer by integrating a large (90 member) ensemble of Boundary Impulse Response tracers in the Whole Atmosphere Community Climate Model version 5. We show that there is a fast transport pathway that occurs over the southern slope of the Tibetan Plateau, northern India, the Arabian Sea, and Saudi Arabia; furthermore, we show that during July this pathway connects the Northern Hemisphere surface to the UTLS on a modal time scale of 5-10 days. A less efficient transport pathway is also identified over the western Pacific. A detailed budget analysis reveals that, while convective processes are responsible for transport to 200-300 hPa, the resolved dynamics, specifically the vertical eddy flux, dominate at 100-150 hPa. Transport variations are analyzed on weekly, monthly, and interannual time scales and are largely related to differences in the resolved dynamics in the UTLS.
引用
收藏
页数:19
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