| Abstract | This report describes the operation of the NRC Twin Otter atmospheric research aircraft in the 1999 Mackenzie GEWEX (Global Energy and Water Cycle Experiment) Study (MAGS). The aircraft was instrumented to measure the vertical fluxes of sensible and latent heat, momentum and CO2 and supporting meteorological and radiometric data. Twenty-four project flights were flown from Inuvik NWT (68 N, 133 W) over tundra, forest and the Mackenzie Delta during two periods covering the spring snowmelt and early summer. A total of 490 flux runs and 36 soundings were flown by the Twin Otter during MAGS. This final report documents the flight program, describes the instrumentation aboard the aircraft, and presents a summary of the run averaged data from each flux run. Absolute energy exchange (particularly sensible heat flux) differed very significantly between forested and non-forested areas at the time of full and partial snow cover. The data also shows the importance of nonturbulent fluxes (melting processes and surface heating) for accurate modeling of this ecosystem. |
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