83 research outputs found
Modelling the soil-plant-atmosphere continuum in a Quercus-Acer stand at Harvard Forest: the regulation of stomatal conductance by light, nitrogen and soil/plant hydraulic properties
Full text linkThe Simulation of the Opposing Fluxes of Latent Heat and CO2 over Various Land-Use Types: Coupling a Gas Exchange Model to a Mesoscale Atmospheric Model
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Simple devices for radiation measurement and integration
No full textSimple thermopiles formed by copper-plating a constantan wire were used to build a solarimeter and a net radiometer. Output was 5–10 mV per cal·cm−2·min−1, adequate to operate a small portable galvanometer for spot readings, a continuously recording potentiometer, or, for integration, a Siemens electrolytic meter. The net radiometer was unventilated, but when oscillated manually, output was independent of wind speed. With two solarimeters in a null-balance circuit, reflection and transmission coefficients of a field crop were read directly on a dial. A circuit was designed to integrate solarimeter output and the standard error of weekly readings was only ±40 cal·cm−2
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