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• W2061215232 abstract "Measurements of carbon dioxide concentration and flux were made above a raised open bog at Lake Kinosheo in the southern Hudson Bay lowlands during the Northern Wetlands Study (NOWES) experiment in 1990. The flux measurements were made using micrometeorological techniques. They provide the first nondisturbing, larger‐scale CO 2 flux measurements for this ecosystem and are the first to integrate the exchange over the whole 24 hours of the day. Continuous concentration measurements by infrared gas analyzers (IRGA) and spot flask samples were taken over the period July 1 to July 29. Afternoon CO 2 values were only 5 to 7 parts per million by volume (ppmv) lower than measurements over the same period at Canadian background monitoring stations. This suggested that there was little draw‐down by local photosynthetic sinks. CO 2 fluxes were measured at 8 and 18 m by Bowen ratio and eddy correlation methods, respectively. The methods produced comparable results on averaged data but often diverged considerably on individual half‐hour results. Fluxes were small. Daytime values averaged to −0.068 mg/m 2 /s by eddy correlation and −0.077 mg/m 2 /s by Bowen ratio over the period June 25 to July 28 (negative denotes downward flux), while at night, flux densities were +0.062 mg/m 2 /s and +0.085 mg/m 2 /s. Integration of the mean diurnal curve gave a net flux of −1.7 g/m 2 /d. Comparable data for this type of ecosystem were not found. However, Coyne and Kelley (1975), measuring near Barrow, Alaska, over wet meadow tundra dominated by sedges and grasses, found net fluxes of −7.2 g/m 2 /d. Typical net CO 2 fluxes from other active temperate ecosystems have been found to be −10 to −20 g/m 2 /d (Monteith, 1976). Mean half hourly fluxes were almost constant at +0.06 mg/m 2 /s through the nighttime hours. About one half‐hour after sunrise the flux reversed direction. Uptake peaked about 0900 eastern daylight time (EDT) and then gradually declined but remained downward until near sunset. The early peak was interpreted to signify that the many plants in the bog experienced water stress during the day as evaporative demand increased and nighttime dew was evaporated." @default.
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• W2061215232 date "1994-01-20" @default.
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• W2061215232 title "Carbon dioxide fluxes over a raised open bog at the Kinosheo Lake tower site during the Northern Wetlands Study (NOWES)" @default.
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• W2061215232 doi "https://doi.org/10.1029/93jd01360" @default.
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