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Discussion papers
https://doi.org/10.5194/acp-2019-1000
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1000
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 02 Jan 2020

Submitted as: research article | 02 Jan 2020

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Analysis of cirrus cloud over the Tibetan Plateau from CALIPSO data: an altitude perspective

Feng Zhang1,2, Qiu-Run Yu1, Yanyu Wang3, Qianshan He4,5, Tiantao Cheng6, Xiaohong Yu7, Dongwei Liu4, and Chunhong Chen4 Feng Zhang et al.
  • 1Department of Atmospheric and Oceanic Sciences, Institute of Atmospheric Sciences, Fudan University, Shanghai, 200433, China
  • 2Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/ Joint International Research Laboratory of Climate and Environment Change (ILCEC), Nanjing University of Information Science and Technology, Nanjing, 210044, China
  • 3Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Institute of Atmospheric Sciences, Fudan University, Shanghai, 200433, China
  • 4Shanghai Meteorological Service, Shanghai, 201199, China
  • 5Shanghai Key Laboratory of Meteorology and Health, Shanghai, 201199, China
  • 6Department of Atmospheric and Oceanic Sciences, Institute of Atmospheric Sciences, Fudan University, Shanghai, 200433, China
  • 7Shanxi Institute of Meteorological Sciences, Taiyuan, 030000, China

Abstract. Using the 5-year summer Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) data, the geographical distributions of cirrus over the Tibetan Plateau have been studied according to the cloud top height. The cirrus number at the corresponding heights exhibit striking differences over the plateau. The maximum occurrence for cirrus top below 9 km starts over the western plateau and moves up to the northern regions when cirrus is between 9–12 km. Above 12 km, the maximum occurrence of cirrus retreats to the southern fringe of the plateau. These characteristics are linked to three kinds of formation mechanisms: large-scale orographic uplift, ice particles generation caused by gravity wave and remnants of overflow from deep convective anvils, respectively.

Feng Zhang et al.
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Short summary
In this work, we make the three main contributions:

we revealed the remarkable differences in the geographical distributions of cirrus over the Tibetan Plateau regarding the cloud top height.

The orography, gravity wave and deep convection determine the formation of cirrus with cloud top below 9, 9–12 and above 12 km respectively.

It is the first time to discuss the contributions of the Tibetan Plateau to the presence of cirrus on a regional scale.

In this work, we make the three main contributions:

we revealed the remarkable differences...

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