Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/2013JF002839 |
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
![]() |
ISSN | 2169-9003 |
EISSN | 2169-9011 |
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 |
推荐引用方式 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. |
条目包含的文件 | ||||||
文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
Temperature and humi(1047KB) | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。