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Numerical Study of the Interaction between Oasis and Urban Areas within an Arid Mountains-Desert System in Xinjiang, China

by Peng Cai 1,2,3,4, Rafiq Hamdi 1,5, Huili He 1,2,3,4, Geping Luo 1,3,6,*, Jin Wang 7, Miao Zhang 1, Chaofan Li 8, Piet Termonia 5,9 and Philippe De Maeyer 2,4
1
State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
2
Department of Geography, Ghent University, Gent 9000, Belgium
3
University of Chinese Academy of Science, Beijing 100094, China
4
Sino-Belgian Joint Laboratory of Geo-information, Urumqi 830011, China; Gent 9000, Belgium
5
Royal Meteorological Institute of Belgium, 1180 Brussels, Belgium
6
Research Center for Ecology and Environment of Central Asia, Chinese Academy of Sciences, Urumqi 830011, China
7
Remote Sensing Center of Xinjiang Meteorological Bureau, Urumqi 830011, China
8
Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster, School of Geographic Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China
9
Department of Physics and Astronomy, Ghent University, Gent 9000, Belgium
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(1), 85; https://doi.org/10.3390/atmos11010085
Received: 2 December 2019 / Revised: 3 January 2020 / Accepted: 7 January 2020 / Published: 10 January 2020
(This article belongs to the Section Biosphere/Hydrosphere/Land–Atmosphere Interactions)
The rapid oasis expansion and urbanization that occurred in Xinjiang province (China) in the last decades have greatly modified the land surface energy balance and influenced the local circulation under the arid mountains-plain background system. In this study, we first evaluated the ALARO regional climate model coupled to the land surface scheme SURFEX at 4 km resolution using 53 national climatological stations and 5 automatic weather stations. We found that the model correctly simulates daily and hourly variation of 2 m temperature and relative humidity. A 4-day clear sky period has been chosen to study both local atmospheric circulations and their mutual interaction. Observations and simulations both show that a low-level divergence over oasis appears between 19:00 and 21:00 Beijing Time when the background mountain-plain wind system is weak. The model simulates a synergistic interaction between the oasis-desert breeze and urban-rural breeze from 16:00 until 22:00 with a maximum effect at 20:00 when the downdraft over oasis (updraft over urban) areas increases by 0.8 (0.4) Pa/s. The results show that the oasis expansion decreases the nocturnal urban heat island in the city of Urumqi by 0.8 °C, while the impact of urban expansion on the oasis cold island is negligible. View Full-Text
Keywords: oasis-desert breeze circulation; urban-rural breeze circulation; urban heat island; town energy balance oasis-desert breeze circulation; urban-rural breeze circulation; urban heat island; town energy balance
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Cai, P.; Hamdi, R.; He, H.; Luo, G.; Wang, J.; Zhang, M.; Li, C.; Termonia, P.; De Maeyer, P. Numerical Study of the Interaction between Oasis and Urban Areas within an Arid Mountains-Desert System in Xinjiang, China. Atmosphere 2020, 11, 85.

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