CO2 Eddy-Correlation Fluxes Estimation and Associated Errors Above Caxiuanã Rain Forest, Eastern Amazonia
Lechinoski, Museu Paraense Emílio Goeldi, Av. Perimetral, 1901 - Terra Firme, Belém, Pará, email@example.com
Sá, Centro de Previsão de Tempo e Estudos Climáticos, Instituto Nacional de Pesquisas Espaciais, firstname.lastname@example.org
Eddy-correlation CO2 turbulent fluxes and their estimated errors have been calculated for data collected at Caxiuanã Reserve, in Eastern Amazônia. The data were measured in a 55m height tower at sampling rate of 10 Hz, during 2005 dry and wet seasons. The results have shown that the forest basically a carbone sink. Wyngaard (1983) method has been used to calculate sampling errors in eddy-correlation turbulent flux estimation. Besides, such error estimations provide also useful information to investigate some statistical characteristics of turbulent eddies, as the determination of integral time-scale . It has been observed a wide range in CO2 flux error estimation (from 20% to 500%) depending of stationary conditions are prevailing or not. During the day-time convective conditions, the errors were, in general, lesser than 50%. However, during early evening periods, the errors were often greater than 100%, mainly during dry season. We used statistical tools such correlation coefficients and integral time-scales to investigate the physical origin of the error variability along the day.