Biosphere/atmosphere CO2 exchange in tundra ecosystems - Community characteristics and relationships with multispectral surface reflectance

• Main Authors: Whiting, Gary J., Bartlett, David S., Fan, Song-Miao, Bakwin, Peter S., Wofsy, Steven C.
• Format: Other/Unknown Material
• Language: unknown
• Published: 1992
• Subjects: 46; Tundra; Alaska
• Online Access: http://ntrs.nasa.gov/search.jsp?R=19930032546

CO2 exchange rates were measured at selected tundra sites near Bethel, Alaska using portable, climate-controlled, instrumented enclosures. The empirically modeled exchange rate for a representative area of vegetated tundra was 1.2 +/- 1.2 g/sq m/d, compared to a tower-measured exchange over the same time period of 1.1 +.0- 1.2 g/sq m/d. Net exchange in response to varying light levels was compared to wet meadow and dry upland tundra, and to the net exchange measured by the micrometeoroidal tower technique. The multispectral reflectance properties of the sites were measured and related to exchange rates in order to provide a quantitative foundation for the use of satellite remote sensing to monitor biosphere/atmosphere CO2 exchange in the tundra biome.