Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6537503 | Agricultural and Forest Meteorology | 2014 | 10 Pages |
Abstract
Different configurations of the measurement system were used to quantify the uncertainty of horizontal concentration gradients and to disentangle its sources. The discrete temporal sampling was the major source of uncertainty, accounting for 54% of the total uncertainty, while spatial sampling accounts for 39% of the total uncertainty in stable conditions and for 35% in unstable conditions, with the remaining uncertainty being explained by the accuracy of the instrumental set-up (analyser, pumps and valves) (7% and 11% for stable and unstable atmospheric conditions, respectively, corresponding to â¼0.2 ppm). Finally, we investigated the effect of buffer volumes on the uncertainty generated by a discrete temporal sampling in the estimation of horizontal advection. The use of volumes with a mean residence time equal to the turn-over time of the manifold reduced by half the standard deviation in the time series of horizontal advection (from 3.8 to 1.8 μmol mâ2 sâ1). The measurement system in its final configuration is currently used to quantify storage and advective fluxes at the site.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Atmospheric Science
Authors
B. Marcolla, I. Cobbe, S. Minerbi, L. Montagnani, A. Cescatti,