On Lagrangian dispersion of 222Rn, H2O and CO2 within the Amazon rain forest

E. Simon, B. Lehmann, C. Ammann, L.N. Ganzeveld, U. Rummel, F.X. Meixner, A.D. Nobre, A. de Araujo, J. Kesselmeier

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

The present study focuses on the description of the vertical dispersion of trace gases within the Amazon rain forest. A Lagrangian approach is parameterised using in-canopy turbulence measurements made at a site in Rondônia (Reserva Jaru). In contrast to common scaling schemes that solely depend on friction parameters measured above the canopy, a combined scaling that also includes night-time free convective mixing in the lower part of dense vegetation canopies is proposed here. 222Rn concentration profiles and soil flux measurements made at a second site near Manaus (Reserva Cuieiras) are used to evaluate the derived parameterisation and the uncertainties of the forward (prediction of concentration profiles) and inverse (prediction of vertical source/sink distributions) solution of the transfer equations. Averaged day- and night-time predictions of the forward solution agree with the observations within their uncertainty range. During night-time, a weak, but effective free convective mixing process in the lower canopy ensures a relatively high flushing rate with residence times of
Original languageEnglish
Pages (from-to)286-340
JournalAgricultural and Forest Meteorology
Volume132
Issue number3-4
DOIs
Publication statusPublished - 2005

Fingerprint

Amazonia
carbon dioxide
canopy
prediction
uncertainty
flux measurement
trace gas
flushing
friction
residence time
parameterization
turbulence
gases
rain forest
vegetation
soil

Keywords

  • atmospheric boundary-layers
  • net ecosystem exchange
  • model-plant canopy
  • douglas-fir forest
  • carbon-dioxide
  • tropical forest
  • turbulence statistics
  • source distributions
  • vegetation canopies
  • scalar dispersion

Cite this

Simon, E. ; Lehmann, B. ; Ammann, C. ; Ganzeveld, L.N. ; Rummel, U. ; Meixner, F.X. ; Nobre, A.D. ; de Araujo, A. ; Kesselmeier, J. / On Lagrangian dispersion of 222Rn, H2O and CO2 within the Amazon rain forest. In: Agricultural and Forest Meteorology. 2005 ; Vol. 132, No. 3-4. pp. 286-340.
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Simon, E, Lehmann, B, Ammann, C, Ganzeveld, LN, Rummel, U, Meixner, FX, Nobre, AD, de Araujo, A & Kesselmeier, J 2005, 'On Lagrangian dispersion of 222Rn, H2O and CO2 within the Amazon rain forest' Agricultural and Forest Meteorology, vol. 132, no. 3-4, pp. 286-340. https://doi.org/10.1016/j.agrformet.2005.08.004

On Lagrangian dispersion of 222Rn, H2O and CO2 within the Amazon rain forest. / Simon, E.; Lehmann, B.; Ammann, C.; Ganzeveld, L.N.; Rummel, U.; Meixner, F.X.; Nobre, A.D.; de Araujo, A.; Kesselmeier, J.

In: Agricultural and Forest Meteorology, Vol. 132, No. 3-4, 2005, p. 286-340.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - On Lagrangian dispersion of 222Rn, H2O and CO2 within the Amazon rain forest

AU - Simon, E.

AU - Lehmann, B.

AU - Ammann, C.

AU - Ganzeveld, L.N.

AU - Rummel, U.

AU - Meixner, F.X.

AU - Nobre, A.D.

AU - de Araujo, A.

AU - Kesselmeier, J.

PY - 2005

Y1 - 2005

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AB - The present study focuses on the description of the vertical dispersion of trace gases within the Amazon rain forest. A Lagrangian approach is parameterised using in-canopy turbulence measurements made at a site in Rondônia (Reserva Jaru). In contrast to common scaling schemes that solely depend on friction parameters measured above the canopy, a combined scaling that also includes night-time free convective mixing in the lower part of dense vegetation canopies is proposed here. 222Rn concentration profiles and soil flux measurements made at a second site near Manaus (Reserva Cuieiras) are used to evaluate the derived parameterisation and the uncertainties of the forward (prediction of concentration profiles) and inverse (prediction of vertical source/sink distributions) solution of the transfer equations. Averaged day- and night-time predictions of the forward solution agree with the observations within their uncertainty range. During night-time, a weak, but effective free convective mixing process in the lower canopy ensures a relatively high flushing rate with residence times of

KW - atmospheric boundary-layers

KW - net ecosystem exchange

KW - model-plant canopy

KW - douglas-fir forest

KW - carbon-dioxide

KW - tropical forest

KW - turbulence statistics

KW - source distributions

KW - vegetation canopies

KW - scalar dispersion

U2 - 10.1016/j.agrformet.2005.08.004

DO - 10.1016/j.agrformet.2005.08.004

M3 - Article

VL - 132

SP - 286

EP - 340

JO - Agricultural and Forest Meteorology

JF - Agricultural and Forest Meteorology

SN - 0168-1923

IS - 3-4

ER -