The Use of FTIR-Spectrometry in Combination with Different Biosphere-Atmosphere Flux Measurement Techniques - Towards an Interdisciplinary Approach in Earth System Science - page 74

Fig. 2 Flux chamber CO 2 - uxes, atmospheric CO 2 -concentration and

air temperature over 5 days in Himmelmoor in August and September 2012

fl uxes, fl flux gradient CO 2 - fl

fl flux gradient method), atmospheric CO 2 -concentrations and air temperatures for 5

days in August and September are shown. The flux chambers (on a dry position in

the wetland), being 20 m apart, showed very similar

fl

fl flux quantities and a clear

diurnal pattern. The CO 2 - flux gradient technique, orig-

inated from dry as well as from wet regions. It shows similar quantities to the

fl uxes, as measured by the fl

ux
chamber data, but a very different diurnal pattern indicating different (dominating)
ecosystem processes in different parts of the wetland, such as photosynthesis, res-
piration or decomposition. Atmospheric CO 2 -concentrations showed clear concen-
tration buildup at night, indicating the presence of a nocturnal boundary layer
(NBL). Additional NBL-height measurements would make boundary layer budget
calculations possible, complementing the

fl

fl flux gradient technique during stable night