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A field campaign took place in May 1989 at S. Pietro Capofiume, Italy, with the aim of gaining knowledge on air-vegetation exchange processes. The main parameters measured were vertical fluxes of turbulent heat and of some chemical species through the atmospheric surface layer. Direct determinations of stomatal resistances in the wheat canopy and complementary meteorological measurements were also carried out. A tethered balloon equipped with a turbulence probe was flown in order to obtain heat fluxes and other turbulence parameters for higher altitudes within the boundary layer. Direct measurements of stomatal resistances were taken in the wheat canopy. The results show that, within the experimental conditions (dry soil, strong solar irradiation, wheat in a later maturation stage), fluxes of nitrogen dioxide and particles can be both upward and downward. The absolute values of the exchange velocity were generally below 0.5 cm/s. The ozone fluxes were mostly downward with absolute values around 2 cm/s. The heat fluxes showed classical behaviour, following the solar irradiation curve.

Additional information

Authors: CHAPUIS A ET AL., JRC Ispra (IT)
Bibliographic Reference: EUR 13368 EN (1991) 65 pp., MF, ECU 4, blow-up copy ECU 8.75
Availability: (2)
Record Number: 199111371 / Last updated on: 1994-12-02
Original language: en
Available languages: en