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A numerical study of tropical cross-tropopause transport by convective overshoots
被引:75
作者:
Chaboureau, J. -P.
[1
]
Cammas, J. -P.
Duron, J.
Mascart, P. J.
Sitnikov, N. M.
Voessing, H. -J.
机构:
[1] Univ Toulouse 3, Lab Aerol, F-31062 Toulouse, France
[2] CNRS, Toulouse, France
[3] Cent Aerol Observ, Dolgoprudnyi, Russia
[4] Johannes Gutenberg Univ Mainz, Inst Atmospher Phys, D-6500 Mainz, Germany
关键词:
STRATOSPHERIC WATER-VAPOR;
DIURNAL CYCLE;
MODEL;
DEEP;
SIMULATIONS;
RESOLUTION;
SYSTEM;
SCHEME;
DEHYDRATION;
TURBULENCE;
D O I:
10.5194/acp-7-1731-2007
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
Observations obtained during the Tropical Convection, Cirrus and Nitrogen Oxides (TROCCINOX) golden day have revealed the presence of ice particles up to 410 K (18.2 km) 2 km above the local tropopause. The case was investigated using a three-dimensional quadruply nested non-hydrostatic simulation and Meteosat Second Generation (MSG) observations. The simulation reproduced the measurements along the flight track fairly well. A reasonable agreement with MSG observations was also achieved: the 10.8-mu m brightness temperature (BT) minimum of 187 K was reproduced ( a value 6 K colder than the environmental cold-point temperature) as was the positive BT difference between the 6.2- and 10.8-mu m bands, an overshoot signature. The simulation produced several overshooting plumes up to 410 K yielding an upward transport of water vapour of a few tons per second across the tropical tropopause. The estimated mass flux agrees with those derived from over tracer budgets, indicating that convection transports mass across the tropopause.
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页码:1731 / 1740
页数:10
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