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Rosenzweig, C.; Jones, J.W.; Hatfield, J.L.; Ruane, A.C.; Boote, K.J.; Thorburn, P.; Antle, J.M.; Nelson, G.C.; Porter, C.; Janssen, S.; Asseng, S.; Basso, B.; Ewert, F.; Wallach, D.; Baigorria, G.; Winter, J.M. |
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Title |
The Agricultural Model Intercomparison and Improvement Project (AgMIP): Protocols and pilot studies |
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Journal Article |
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Year |
2013 |
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Agricultural and Forest Meteorology |
Abbreviated Journal |
Agricultural and Forest Meteorology |
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170 |
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166-182 |
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0168-1923 |
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CropM, ftnotmacsur, IPCC-AR5 |
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Call Number |
MA @ admin @ |
Serial |
4927 |
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Author |
Teixeira, E.I.; Fischer, G.; van Velthuizen, H.; Walter, C.; Ewert, F. |
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Title |
Global hot-spots of heat stress on agricultural crops due to climate change |
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Journal Article |
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Year |
2013 |
Publication |
Agricultural and Forest Meteorology |
Abbreviated Journal |
Agricultural and Forest Meteorology |
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170 |
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206-215 |
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0168-1923 |
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CropM, ftnotmacsur, IPCC-AR5 |
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MA @ admin @ |
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4929 |
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Author |
Watson, J.; Challinor, A. |
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Title |
The relative importance of rainfall, temperature and yield data for a regional-scale crop model |
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Journal Article |
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Year |
2013 |
Publication |
Agricultural and Forest Meteorology |
Abbreviated Journal |
Agricultural and Forest Meteorology |
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170 |
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47-57 |
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0168-1923 |
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CropM, ftnotmacsur, IPCC-AR5 |
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MA @ admin @ |
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4930 |
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Author |
Francone, C.; Katul, G.G.; Cassardo, C.; Richiardone, R. |
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Title |
Turbulent transport efficiency and the ejection-sweep motion for momentum and heat on sloping terrain covered with vineyards |
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Journal Article |
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2012 |
Publication |
Agricultural and Forest Meteorology |
Abbreviated Journal |
Agricultural and Forest Meteorology |
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162-163 |
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98-107 |
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coherent motion; cumulant expansions; heat and momentum transfer; sloping terrain; vineyards; planar fit method; boundary-layers; reynolds stress; dense canopies; plant canopies; flow; fluxes; forest; fields; hills |
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In boundary layer flows, it is now recognized that the net momentum and mass exchange rates are dominated by the statistical properties of ejecting and sweeping motion often linked to the presence of coherent turbulent structures. Over vineyards, three main factors impact the transport properties of such coherent motion: presence of sloping terrain, variations in leaf area index (LAI) during the growing season, and thermal stratification. The effect of these factors on momentum and heat transport is explored for three vineyard sites situated on different slopes. All three sites experience similar seasonal variation in LAI and mean wind conditions. The analysis is carried out using a conventional quadrant analysis technique and is tested against two models approximating the joint probability density function (JPDF) of the flow variables. It is demonstrated that a Gaussian JPDF explains much of the updraft and downdraft statistical contributions to heat and momentum transport efficiencies for all three sites. An incomplete or truncated third-order cumulant expansion method (ICEM) of the JPDF that retains only the mixed moments and ignores the skewness contributions describes well all the key properties of ejections and sweeps for all slopes, LAI, and stability classes. The implication of these findings for diagnosing potential failures of gradient-diffusion theory over complex terrain is discussed. Because only lower order moments are needed to describe the main characteristics of the JPDF, the use of the Moving Equilibrium Hypothesis (MEH) to predict these moments from the locally measured sensible heat flux and friction velocity is explored. Provided the planar fit coordinate transformation is applied to the data, the MEH can describe these statistical moments at all three sites regardless of terrain slopes and LAI values. (C) 2012 Elsevier B.V. All rights reserved. |
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English |
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0168-1923 |
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CropM |
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MA @ admin @ |
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4471 |
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