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Variations in the energy budget above growing wheat and barley, Ilstorp 1998 : a gradient-profile approach

Kjellander, Carin (1999) In Lunds universitets Naturgeografiska institution - Seminarieuppsatser
Dept of Physical Geography and Ecosystem Science
Abstract
Fluxes of sensible heat and latent heat were calculated above fields of barley and wheat in
Ilstorp, using a gradient profile approach. Gradient Richardson’s number was used as the
stability parameter, and it was shown that atmospheric stability varies both with time of the day
and wind speed. Temperature and wind profiles were studied, and it was possible to detect a
rise in the active surface in relation to increasing crop height. Displacement heights and
roughness lengths were calculated for separate periods of time. The connection between these
parameters and crop height was perhaps not as simple as predicted.
The results were used to estimate the energy budget above growing crop; encompassing net
radiation, sensible heat,... (More)
Fluxes of sensible heat and latent heat were calculated above fields of barley and wheat in
Ilstorp, using a gradient profile approach. Gradient Richardson’s number was used as the
stability parameter, and it was shown that atmospheric stability varies both with time of the day
and wind speed. Temperature and wind profiles were studied, and it was possible to detect a
rise in the active surface in relation to increasing crop height. Displacement heights and
roughness lengths were calculated for separate periods of time. The connection between these
parameters and crop height was perhaps not as simple as predicted.
The results were used to estimate the energy budget above growing crop; encompassing net
radiation, sensible heat, latent heat and soil heat fluxes. It was found that, in the beginning of
the season, latent heat flux dominated the energy balance budget. As the crop matured and
turned yellow, crop height decreased slightly, and the sensible heat flux now increased above
the latent heat flux. Soil heat flux remained quite constant during the summer, around 0 to 15 W
m-2. (Less)
Please use this url to cite or link to this publication:
author
Kjellander, Carin
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
geomorphology, physical geography, logarithmic wind profile, atmospheric boundaries, heat flow, climatological processes, pedology, cartography, climatology, naturgeografi, geomorfologi, marklära, kartografi, klimatologi
publication/series
Lunds universitets Naturgeografiska institution - Seminarieuppsatser
report number
61
language
English
id
1333565
date added to LUP
2005-11-02 00:00:00
date last changed
2011-07-04 12:08:33
@misc{1333565,
  abstract     = {Fluxes of sensible heat and latent heat were calculated above fields of barley and wheat in
Ilstorp, using a gradient profile approach. Gradient Richardson’s number was used as the
stability parameter, and it was shown that atmospheric stability varies both with time of the day
and wind speed. Temperature and wind profiles were studied, and it was possible to detect a
rise in the active surface in relation to increasing crop height. Displacement heights and
roughness lengths were calculated for separate periods of time. The connection between these
parameters and crop height was perhaps not as simple as predicted.
The results were used to estimate the energy budget above growing crop; encompassing net
radiation, sensible heat, latent heat and soil heat fluxes. It was found that, in the beginning of
the season, latent heat flux dominated the energy balance budget. As the crop matured and
turned yellow, crop height decreased slightly, and the sensible heat flux now increased above
the latent heat flux. Soil heat flux remained quite constant during the summer, around 0 to 15 W
m-2.},
  author       = {Kjellander, Carin},
  keyword      = {geomorphology,physical geography,logarithmic wind profile,atmospheric boundaries,heat flow,climatological processes,pedology,cartography,climatology,naturgeografi,geomorfologi,marklära,kartografi,klimatologi},
  language     = {eng},
  note         = {Student Paper},
  series       = {Lunds universitets Naturgeografiska institution - Seminarieuppsatser},
  title        = {Variations in the energy budget above growing wheat and barley, Ilstorp 1998 : a gradient-profile approach},
  year         = {1999},
}