Oscillation of wind temperature humidity in the atmospheric surface layer over tropical semi-arid stations |
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| Authors: | T Dharmaraj GR Chinthalu RT Waghmare |
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| Institution: | 1. Helmholtz Centre for Environmental Research – UFZ, Department of Catchment Hydrology, Theodor-Lieser-Str. 4, D-06120 Halle, Germany;2. Institute of Botany (210), Hohenheim University, D-70593 Stuttgart, Germany;3. Department of Life Sciences, Anglia Ruskin University, East Road, CB1 1PT Cambridge, UK;1. Department of Wood and Paper Science & Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran;2. Institute of Geography, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany;1. Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, D-06108 Halle (Saale), Germany;2. German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, D-04103 Leipzig, Germany;3. Institute of Agricultural Sciences, ETH Zurich, CH-8092 Zurich, Switzerland;4. Institute of Evolutionary Biology and Environmental Studies, University of Zurich, CH-8057 Zurich, Switzerland;5. School of Geosciences, Crew Building, the King’s Buildings, University of Edinburgh, Edinburgh EH9 3FF, Scotland, UK;6. Department of Ecology, College of Urban and Environmental Sciences and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China;7. Department of Plant Sciences, University of Oxford, OX1 3RB, UK;8. Faculty of Biology, Geobotany, University of Freiburg, D-79104 Freiburg, Germany;1. Institute of Resources and Environment, Linyi University, Linyi 276000, China;2. Shandong Provincial Key Laboratory of Water and Soil Conservation & Environmental Protection, Linyi 276000, China;3. College of Population, Resources and Environment, Shandong Normal University, Jinan 250014, China;4. College of Geographical Science, Nanjing Normal University, Nanjing 210046, China;5. Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008, China;1. Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan;2. Division of Hydrologic Sciences, Desert Research Institute, 755 E. Flamingo Road, Las Vegas, NV 89119, USA |
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| Abstract: | Analysis of wind, air temperature, humidity and rainfall data from Land Surface Processes Experiment (LASPEX) in the surface layer at Anand (22°35′N, 72°55′E) and Khandha (22°02′N, 73°11′E) during January to December 1997 is presented. Wind and temperature at various levels showed prominent diurnal variation. Progression of daily wind and temperature revealed the intra-seasonal, quasi-biweekly and 6–9 day oscillations indicated large-scale convection, transport of heat and water vapor from Arabian Sea towards these stations.Power spectrum of wind and humidity corroborated the planetary scale Madden–Julian oscillation in the surface layer. Periodic oscillations of 21, 6–9, 1 day and 12 h were prominent in the spectrum of all variables. Low-frequency spectral peaks showed the energy in wind is 2–3 times higher over Khandha than at Anand whereas temperature is 3 times higher at Anand than Khandha. |
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