Analysis of periods with strong and coherent CO 2 advection over a forested hill
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 157857
Author(s) Zeri, M.; Rebmann, C.; Feigenwinter, C.; Sedlak, P.
Author(s) at UniBasel Feigenwinter, Christian
Year 2010
Title Analysis of periods with strong and coherent CO 2 advection over a forested hill
Journal Agricultural and forest meteorology
Volume 150
Number 5
Pages / Article-Number 674-683
Keywords Forest ecosystems, Advection, Net ecosystem exchange, Carbon balance, ADVEX
Abstract Horizontal  and  vertical  advective  fluxes  of  CO 2 measured  during  the  CarboEurope-IP  advectionexperiment (ADVEX) at the Wetzstein spruce forest site in Thuringia, Germany, were related to winddirection, stratification regime and friction velocity u * . Measurements of wind speed and directioncarried out at one of the slopes of the ridge revealed the existence of reverse flow below the canopy onthe downwind side. This uphill flow occurred concurrently with the advective fluxes measured at the topof the hill. Such result is in agreement with recent modeling works that support the existence ofadvection at low hills covered with a canopy. Another experimental evidence that suggest a link betweenadvection at this site with the flow over the hill came from the analysis of the horizontal gradient of CO 2inside the volume  formed by the ADVEX towers. It was observed that CO 2 accumulated  near thedownwind side of the crest for cross-ridge flows, what is consistent with another modeling work of thetransport of scalars across a low hill covered with a canopy.
Publisher Elsevier
ISSN/ISBN 0168-1923
Full Text on edoc No
Digital Object Identifier DOI 10.1016/j.agrformet.2009.12.003
ISI-Number WOS:000278244400004
Document type (ISI) Article

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