The
mixing ratio and the surface-atmosphere exchange of carbon dioxide have been
monitored at different elevations on a tall tower in West
Hungary (Hegyhátsál, 46o57'N, 16o39'E, 248 m
asl) since 1994 and 1997, respectively. The vertical mixing ratio profile
measurements along the 115 m tall tower has been completed with occasional
aircraft measurements up to 3000 m above the ground. The poster presents the
Hungarian tall tower site and the temporal variation of carbon dioxide observed
here. We discuss the region of influence determining the mixing ratio
variability, the so-called concentration footprint, as well as that of the flux
measurements. Methodological problems caused by the elevated monitoring levels,
and their solutions, are also given. The environmental factors governing the
net ecosystem exchange (NEE) of the vegetation are analyzed by means of a
process oriented ecosystem simulation model. It might be used to estimate the
future behavior of the region as the climate is changing. On the basis of the
measurements at Hegyhátsál a boundary layer model has been developed which can
give rough surface-atmosphere carbon dioxide flux estimate for sites where only
surface mixing ratio monitoring is available.
Author: L. Haszpra, Z. Barcza, D. Hidy, T. Szabó, and K. Tarczay (haszpra dot l at met dot hu)
Filesize: 30.71 Kb