Arid
DOI10.1002/2013JF002839
Temperature and humidity within a mobile barchan sand dune, implications for microbial survival
Louge, M. Y.1; Valance, A.2; el-Moctar, A. Ould3; Xu, J.1; Hay, A. G.4; Richer, R.5
通讯作者Louge, M. Y.
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
ISSN2169-9003
EISSN2169-9011
出版年2013
卷号118期号:4页码:2392-2405
英文摘要

Although microorganisms play an important role in biological soil crusts and plant rhizospheres in deserts, it is unclear whether temperature and moisture deep within relatively fast moving hyperarid mobile dunes present a suitable habitat for microbes. To inform this question, we report measurements of temperature and humidity from probes initially sunk below the leeward avalanche face of a mobile barchan dune in the Qatar desert, emerging windward after 15months of deep burial. Despite large diurnal variations on the surface, temperature within this dune of 5.6m height is predictable, as long as dune advection is properly considered. It evolves on smaller amplitude and longer timescale than the surface, lagging average seasonal atmospheric conditions by about 2months. We contrast these deep thermal records with measurements of diurnal variations of the temperature profile just below the surface, which we calculate with a thermal model predicting the relative roles of winddriven convective heat transfer and net radiation flux on the dune. Observations and analyses also suggest why random precipitation on the leeward face produces a more unpredictable moisture patchwork on the windward slope. By rapidly reaching sheltered depths, small quantities of rain falling on that face escape evaporation and endure within the dune until resurfacing upwind. At depths below 10cm, we show that moisture, rather than temperature, determines the viability of microbes and we provide initial microscopic and respirationbased evidence of their presence below the windward slope.


英文关键词mobile sand dune sand temperature sand humidity microbial presence
类型Article
语种英语
国家USA ; France ; Qatar
收录类别SCI-E
WOS记录号WOS:000329873500025
WOS关键词DESERT SOIL ALGAE ; SEDIMENTARY STRUCTURE ; HYSTERESIS MODEL ; WATER ACTIVITY ; WIND ; EVAPORATION ; DYNAMICS ; STABILIZATION ; CONDENSATION ; AGGREGATION
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/178441
作者单位1.Cornell Univ, Sibley Sch Mech & Aerosp Engn, Ithaca, NY 14853 USA;
2.Univ Rennes 1, CNRS UMR 6251, Inst Phys Rennes, Rennes, France;
3.Univ Nantes, Ecole Polytech, UMR CNRS 6607, Lab Thermocinet, Nantes, France;
4.Cornell Univ, Ithaca, NY 14853 USA;
5.Qatar Fdn, Weill Cornell Med Coll Qatar, Doha, Qatar
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GB/T 7714
Louge, M. Y.,Valance, A.,el-Moctar, A. Ould,et al. Temperature and humidity within a mobile barchan sand dune, implications for microbial survival[J],2013,118(4):2392-2405.
APA Louge, M. Y.,Valance, A.,el-Moctar, A. Ould,Xu, J.,Hay, A. G.,&Richer, R..(2013).Temperature and humidity within a mobile barchan sand dune, implications for microbial survival.JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE,118(4),2392-2405.
MLA Louge, M. Y.,et al."Temperature and humidity within a mobile barchan sand dune, implications for microbial survival".JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 118.4(2013):2392-2405.
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