Analysis of periods with strong and coherent CO2 advection over a forested hill

0348512 - ÚFA 2011 RIV NL eng J - Journal Article
Zeri, M. - Rebmann, C. - Feigenwinter, Ch. - Sedlák, Pavel
Analysis of periods with strong and coherent CO2 advection over a forested hill.
Agricultural and Forest Meteorology. Roč. 150, č. 5 (2010), s. 674-683. ISSN 0168-1923. E-ISSN 1873-2240
R&D Projects: GA AV ČR IAA300420803
Institutional research plan: CEZ:AV0Z30420517
Keywords : Forest ecosystems * Advection * Net ecosystem exchange * Carbon balance * ADVEX
Subject RIV: DG - Athmosphere Sciences, Meteorology
Impact factor: 3.228, year: 2010

Horizontal and vertical advective fluxes of CO2 measured during the CarboEurope-IP advection experiment (ADVEX) at the Wetzstein spruce forest site in Thuringia, Germany, were related to wind direction, stratification regime and friction velocity u*. Measurements of wind speed and direction carried out at one of the slopes of the ridge revealed the existence of reverse flow below the canopy on the downwind side. This uphill flow occurred concurrently with the advective fluxes measured on the hill top. Another experimental evidence that suggest a link between advection at this site with the flow over the hill came from the analysis of the horizontal gradient of CO2 inside the volume formed by the ADVEX towers. It was observed that for cross-ridge flows, CO2 accumulated near the downwind side of the crest. The findings are consistent with recent model simulations of the flow and scalar transport across a low hill covered with a canopy.
Permanent Link: http://hdl.handle.net/11104/0189034