Temperature, Humidity Profiles and Heat Balance in the Megadune Surface Layer of the Badain Jaran Desert

doi:10.7522/j.issn.1000-694X.2017.00098

Journal of Desert Research ›› 2018, Vol. 38 ›› Issue (6): 1303-1312.DOI: 10.7522/j.issn.1000-694X.2017.00098

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Temperature, Humidity Profiles and Heat Balance in the Megadune Surface Layer of the Badain Jaran Desert

Xu Xingbin^1,2, Wang Naiang^1,2, Liang Xiaoyan¹, Niu Zhenmin¹, Zhao Liqiang¹, Wang Yixin¹

1. College of Earth and Environmental Sciences/Research Center for Glacier and Desert, Lanzhou University, Lanzhou 730000, China;
2. College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, China

Received:2017-10-12 Revised:2017-11-30 Online:2018-11-20 Published:2018-12-05

Abstract

Abstract: Based on the megadune micro-meteorological data obtained from the field observation experiment station of Research Center for Glacier and Desert of Lanzhou University in the Badain Jaran Desert during 2015-2016, we analyzed the change trends of the temperature and humidity profile, soil stratification temperature and radiation flux in the megadune in the Badain Jaran Desert. Meawhile, one-dimensional heat conduction equation and the compounding method were conducted to explore the characteristics of the turbulence flux and soil heat flux. The phenomenon of inverse humidity was observed at first time. The results show that the daily average temperature gradients of the near-surface atmosphere are nearly isothermal or inverted and the thickness of winter thermal inversion layer is larger than that in summer. The seasonal specific humidity has the highest value in summer and the lowest in winter with an annual average value of 4.2 g·kg^-1, which is higher than in the Taklimakan Desert. The specific humidity of each season shows a decreasing trend at first and then increases. In addition, the amplitude of the soil heat flux between the end of February and early May is larger than any other time during 2015-2016. The sensible heat flux has significant daily variations while the latent heat flux is relatively smooth and fluctuates around 0 W·m^-2. The research proves that the heat flux is the prior route for the energy exchange process in the megadune of Badain Jaran Desert. Simultaneously, the temperature difference of land-air is the main influence and control factor of sensible heat flux change.

Key words: Badain Jaran Desert, profile structure, inverse humidity, soil heat flux, energy exchange

CLC Number:

P422.4

Xu Xingbin, Wang Naiang, Liang Xiaoyan, Niu Zhenmin, Zhao Liqiang, Wang Yixin. Temperature, Humidity Profiles and Heat Balance in the Megadune Surface Layer of the Badain Jaran Desert[J]. Journal of Desert Research, 2018, 38(6): 1303-1312.

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Temperature, Humidity Profiles and Heat Balance in the Megadune Surface Layer of the Badain Jaran Desert

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