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  Relating the X-band opacity of a tropical tree canopy to sapflow, rain interception and dew formation

Schneebeli, M., Wolf, S., Kunert, N., Eugster, W., & Matzler, C. (2011). Relating the X-band opacity of a tropical tree canopy to sapflow, rain interception and dew formation. Remote Sensing of Environment, 115(8), 2116-2125. doi:10.1016/j.rse.2011.04.016.

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Schneebeli, M., Autor
Wolf, S., Autor
Kunert, N.1, Autor           
Eugster, W., Autor
Matzler, C., Autor
Affiliations:
1Tree Assimilation and Carbon Allocation, Dr. N. Kunert, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497779              

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Schlagwörter: X-band Tropics Rain interception Dew Sapflow Radiometry Microwave techniques Eddy covariance sap flow dielectric-constant flux measurements forest canopy heat-flux water model soil transpiration evaporation
 Zusammenfassung: During summer and autumn 2007, a 11 GHz microwave radiometer was deployed in an experimental tree plantation in Sardinilla, Panama. The opacity of the tree canopy was derived from incoming brightness temperatures received on the ground. A collocated eddy-covariance flux tower measured water vapor fluxes and meteorological variables above the canopy. In addition, xylem sapflow of trees was measured within the flux tower footprint. We observed considerable diurnal differences between measured canopy opacities and modeled theoretical opacities that were closely linked to xylem sapflow. It is speculated that dielectric changes in the leaves induced by the sapflow are causing the observed diurnal changes. In addition, canopy intercepted rain and dew formation also modulated the diurnal opacity cycle. With an enhanced canopy opacity model accounting for water deposited on the leaves, we quantified the influence of canopy stored water (i.e. intercepted water and dew) on the opacity. A time series of dew formation and rain interception was directly monitored during a period of two weeks. We found that during light rainfall up to 60% of the rain amount is intercepted by the canopy whereas during periods of intense rainfall only 4% were intercepted. On average, 0.17 mm of dew was formed during the night. Dew evaporation contributed 5% to the total water vapor flux measured above the canopy. (C) 2011 Elsevier Inc. All rights reserved.

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Sprache(n): eng - English
 Datum: 2011
 Publikationsstatus: Erschienen
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 Identifikatoren: DOI: 10.1016/j.rse.2011.04.016
ISI: ://WOS:000292235400028
Anderer: BGC1521
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Titel: Remote Sensing of Environment
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: New York : Elsevier
Seiten: - Band / Heft: 115 (8) Artikelnummer: - Start- / Endseite: 2116 - 2125 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/954925437513
ISSN: 0034-4257