The data in this set is streaming data from meteorological instruments placed on a 41 meter tower at the base of watershed 1 in the HJ Andrews Experimental Forest. Sensors are placed at several heights ranging from 4.2 to 38 meters and have been collecting streaming data at several intervals ranging from 10 Hz for sonic anemometer data to once every ten minutes for soil efflux chambers. Data has been collected since 2005, however, gaps in certain sensor data are present depending on whether or not certain sensors were deployed. Parameters measured include air temperature (degrees C), relative humidity (% change in humidity since previous remeasurement), atmospheric carbon dioxide (per mil), wind speed and direction (k/h and degrees azimuth), net radiation (mJ/square meter) and photosynthetically active radiation(micromoles per square meter). Data collection is continuous, and is also sourced in the FEEL Database. The primary species on WS1 are PSME and TSHE. Collection instruments include sonic anemometers, wind flags, open-path infrared gas analyzers, Picarro isotopic measurements (water, carbon dioxide, methane), pyranometers, barometers, thermistors, soil moisture reflectometers, long-term soil efflux chambers, radiometers, and rain gauges.
Adam M Kennedy, Barbara J Bond, Fox Sparky Peterson, Michael H. Unsworth, Scott Thomas Allen, Thomas G. Pypker
The purpose of the tower measurements is to determine and characterize atmospheric fluxes of water, carbon, and radiation on complex terrain. The tower data allows researchers to assess the area contributing to advection in cold air drainage, thereby estimating ecosystem respiration from mass balances. Because different flow dynamics exist on WS1 depending on season and atmospheric conditions, and vary extensively over complex terrain, air passing the tower reflects the integration of this heterogenity, and can be used to establish relatively plausible estimates of ecosystem respiration at the watershed scale.