Set of functions used in the calculation of biophysical variables.
biophysics_leafTemperature(absRad, airTemperature, u, E, leafWidth = 1.0)
biophysics_radiationDiurnalPattern(t, daylength)
biophysics_temperatureDiurnalPattern(t, tmin, tmax, daylength)Wind speed above the leaf boundary layer (in m/s).
Air temperature (in <U+00BA>C).
Minimum and maximum daily temperature (<U+00BA>C).
Absorbed long- and short-wave radiation (in W<U+00B7>m-2).
Transpiration flow (in mmol H20<U+00B7>m-2<U+00B7>s-1) per one sided leaf area basis.
Leaf width (in cm).
Time of the day (in seconds).
Day length (in seconds).
Values returned for each function are:
biophysics_leafTemperature: leaf temperature (in <U+00BA>C)
biophysics_radiationDiurnalPattern: the proportion of daily radiation corresponding to the input time in seconds after sunrise.
biophysics_temperatureDiurnalPattern: diurnal pattern of temperature assuming a sinusoidal pattern with T = Tmin at sunrise and T = (Tmin+Tmax)/2 at sunset.
Campbell, G. S., and J. M. Norman. 1998. AN INTRODUCTION TO ENVIRONMENTAL BIOPHYSICS.: 2nd edition. (eqns. 14.1 & 14.3)
B. Y. H. Liu and R. C. Jordan, <U+201C>The interrelationship and characteristic distribution of direct, diffuse and total solar radiation,<U+201D> Solar Energy, vol. 4, no. 3, pp. 1<U+2013>19, 1960.
McMurtrie, R. E., D. A. Rook, and F. M. Kelliher. 1990. Modelling the yield of Pinus radiata on a site limited by water and nitrogen. Forest Ecology and Management 30:381<U+2013>413.
McMahon, T. A., M. C. Peel, L. Lowe, R. Srikanthan, and T. R. McVicar. 2013. Estimating actual, potential, reference crop and pan evaporation using standard meteorological data: a pragmatic synthesis. Hydrology & Earth System Sciences 17:1331<U+2013>1363. See also: http://www.fao.org/docrep/x0490e/x0490e06.htm