Estimation of the advection effects induced by surface heterogeneities in the surface energy budget

J. Cuxart, B. Wrenger, D. Martinez-Villagrasa, J. Reuder, M.O. Jonassen, M.A. Jimenez, M. Lothon, O.K. Hartogensis, J. Dunnermann, L. Conangla, A. Garai

Research output: Contribution to journalArticleAcademicpeer-review

12 Citations (Scopus)

Abstract

The effect of terrain heterogeneities in one-point
measurements is a continuous subject of discussion. Here
we focus on the order of magnitude of the advection term
in the equation of the evolution of temperature as generated
by documented terrain heterogeneities and we estimate its
importance as a term in the surface energy budget (SEB),
for which the turbulent fluxes are computed using the eddycorrelation
method. The heterogeneities are estimated from
satellite and model fields for scales near 1 km or broader,
while the smaller scales are estimated through direct measurements
with remotely piloted aircraft and thermal cameras
and also by high-resolution modelling. The variability
of the surface temperature fields is not found to decrease
clearly with increasing resolution, and consequently the advection
term becomes more important as the scales become
finer. The advection term provides non-significant values to
the SEB at scales larger than a few kilometres. In contrast,
surface heterogeneities at the metre scale yield large values
of the advection, which are probably only significant in the
first centimetres above the ground. The motions that seem
to contribute significantly to the advection term in the SEB
equation in our case are roughly those around the hectometre
scales.
Original languageEnglish
Pages (from-to)9489-9504
JournalAtmospheric Chemistry and Physics
Volume16
Issue number14
DOIs
Publication statusPublished - 2016

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surface energy
energy budget
advection
aircraft
surface temperature
effect
modeling
temperature

Cite this

Cuxart, J., Wrenger, B., Martinez-Villagrasa, D., Reuder, J., Jonassen, M. O., Jimenez, M. A., ... Garai, A. (2016). Estimation of the advection effects induced by surface heterogeneities in the surface energy budget. Atmospheric Chemistry and Physics, 16(14), 9489-9504. https://doi.org/10.5194/acp-16-9489-2016
Cuxart, J. ; Wrenger, B. ; Martinez-Villagrasa, D. ; Reuder, J. ; Jonassen, M.O. ; Jimenez, M.A. ; Lothon, M. ; Hartogensis, O.K. ; Dunnermann, J. ; Conangla, L. ; Garai, A. / Estimation of the advection effects induced by surface heterogeneities in the surface energy budget. In: Atmospheric Chemistry and Physics. 2016 ; Vol. 16, No. 14. pp. 9489-9504.
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abstract = "The effect of terrain heterogeneities in one-pointmeasurements is a continuous subject of discussion. Herewe focus on the order of magnitude of the advection termin the equation of the evolution of temperature as generatedby documented terrain heterogeneities and we estimate itsimportance as a term in the surface energy budget (SEB),for which the turbulent fluxes are computed using the eddycorrelationmethod. The heterogeneities are estimated fromsatellite and model fields for scales near 1 km or broader,while the smaller scales are estimated through direct measurementswith remotely piloted aircraft and thermal camerasand also by high-resolution modelling. The variabilityof the surface temperature fields is not found to decreaseclearly with increasing resolution, and consequently the advectionterm becomes more important as the scales becomefiner. The advection term provides non-significant values tothe SEB at scales larger than a few kilometres. In contrast,surface heterogeneities at the metre scale yield large valuesof the advection, which are probably only significant in thefirst centimetres above the ground. The motions that seemto contribute significantly to the advection term in the SEBequation in our case are roughly those around the hectometrescales.",
author = "J. Cuxart and B. Wrenger and D. Martinez-Villagrasa and J. Reuder and M.O. Jonassen and M.A. Jimenez and M. Lothon and O.K. Hartogensis and J. Dunnermann and L. Conangla and A. Garai",
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Cuxart, J, Wrenger, B, Martinez-Villagrasa, D, Reuder, J, Jonassen, MO, Jimenez, MA, Lothon, M, Hartogensis, OK, Dunnermann, J, Conangla, L & Garai, A 2016, 'Estimation of the advection effects induced by surface heterogeneities in the surface energy budget', Atmospheric Chemistry and Physics, vol. 16, no. 14, pp. 9489-9504. https://doi.org/10.5194/acp-16-9489-2016

Estimation of the advection effects induced by surface heterogeneities in the surface energy budget. / Cuxart, J.; Wrenger, B.; Martinez-Villagrasa, D. ; Reuder, J.; Jonassen, M.O.; Jimenez, M.A.; Lothon, M.; Hartogensis, O.K.; Dunnermann, J.; Conangla, L.; Garai, A.

In: Atmospheric Chemistry and Physics, Vol. 16, No. 14, 2016, p. 9489-9504.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Cuxart, J.

AU - Wrenger, B.

AU - Martinez-Villagrasa, D.

AU - Reuder, J.

AU - Jonassen, M.O.

AU - Jimenez, M.A.

AU - Lothon, M.

AU - Hartogensis, O.K.

AU - Dunnermann, J.

AU - Conangla, L.

AU - Garai, A.

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AB - The effect of terrain heterogeneities in one-pointmeasurements is a continuous subject of discussion. Herewe focus on the order of magnitude of the advection termin the equation of the evolution of temperature as generatedby documented terrain heterogeneities and we estimate itsimportance as a term in the surface energy budget (SEB),for which the turbulent fluxes are computed using the eddycorrelationmethod. The heterogeneities are estimated fromsatellite and model fields for scales near 1 km or broader,while the smaller scales are estimated through direct measurementswith remotely piloted aircraft and thermal camerasand also by high-resolution modelling. The variabilityof the surface temperature fields is not found to decreaseclearly with increasing resolution, and consequently the advectionterm becomes more important as the scales becomefiner. The advection term provides non-significant values tothe SEB at scales larger than a few kilometres. In contrast,surface heterogeneities at the metre scale yield large valuesof the advection, which are probably only significant in thefirst centimetres above the ground. The motions that seemto contribute significantly to the advection term in the SEBequation in our case are roughly those around the hectometrescales.

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EP - 9504

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JF - Atmospheric Chemistry and Physics

SN - 1680-7316

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