Accessing and Using National LTER Climate and Hydrology Data from ClimDB and HydroDB
Gordon Heisler, Gary Fisher and Jonathan Walsh
Standardized measurements and reporting of meteorological variables at LTER sites facilitate comparison of conditions at two or more sites. The LTER Climate Committee established guidelines for measurements in 1986. Meteorologic stations may range from those that observe daily maximum and minimum temperatures and precipitation to stations that continuously record vapor pressure, wind speed and direction, solar radiation, and other site-specific variables along with the air temperature and precipitation. Each LTER site has one station designated as the "primary" station and most have other stations designated as secondary. Secondary stations may be those that measure only precipitation in proximity to a gauged watershed. BES established a primary station at the McDonogh School in April 2000. The array of variables measured at McDonogh puts the BES station at the highest level according to LTER Climate Committee standards, because, in addition to standard weather variables, the station measures down- and up-welling photosynthetically active radiation, net all-wave radiation, soil temperature at two levels, and soil moisture. Funding from the USDA Forest Service has supported the archiving of daily summaries of climate data from all LTER sites in a system called ClimDB, and these data are freely available from a server at Oregon State University ( Data may be downloaded numerically in several formats as well as graphed online (see figure). Many sites provide data from nearby stations other their own LTER stations. This presentation will illustrate the procedures for accessing ClimDB data and metadata as well as hydrologic data from HydroDB that is part of the same data archive system.
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Keywords: Climate data, ClimDB, hydrologic data, HydroDB LTER sites

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