SURFACE RENEWAL DETERMINATION OF SCALAR FLUXES OVER AN OLD-GROWTH FOREST

摘要

Based on these experiments, the SR method provides a simple, low-cost method to estimate scalar fluxes without the need to measure stability or wind speed. The SR method offers a possible alternative for estimating H, λE, and F_c when the α weighting factor is known. Therefore, the SR method can be used to estimate scalar fluxes during periods with missing data or when more expensive equipment is unavailable. More work is needed to filter or smooth the EC estimates before calibrating the SR data. The SR methods offers a possible alternative for estimating H., when the alpha weighting factor is known, although it exhibits larger errors for F_c and λE than H. Figure 4. Half-hour λE_(EC) vs. λE_(SR) using the time lag r=4 s from data collected during May and June 1999. Data were corrected using daytime and nighttime α factors.