North Temperate Lakes LTER: High Frequency Meteorological and Dissolved Oxygen Data - Trout Lake Buoy 2004 - current

The instrumented buoy on Trout Lake is equipped with a dissolved oxygen sensor, a
thermistor chain, and meteorological sensors that provide fundamental information on lake
thermal structure, weather conditions, and lake metabolism. Data are usually collected every
10 minutes with occasional periods of 2 minute data for short periods to answer specific
questions. The D-Opto dissolved oxygen sensor is 0.5m from the lake surface. Meteorological
sensors measure wind speed, wind direction, relative humidity, air temperature,
photosynthetically active radiation (PAR), and barometric pressure. Starting in 2005,
thermistors were placed every 0.5-1m from the surface through 14m and every 2 to 4m from 14m
to the bottom of the water column at 31m. In July 2006, a new thermistor chain was deployed
with thermistors placed every meter from the surface through a depth of 19 meters. After
correcting for flux to or from the atmosphere and vertical mixing within the water column,
high frequency measurements of dissolved gases such as carbon dioxide and oxygen can be used
to estimate gross primary productivity, respiration, and net ecosystem productivity, the
basic components of whole lake metabolism. Data are averaged to daily values from one minute
samples for years 2005 - 2006. Daily values are computed from high resolution data starting
in year 2007. Data are averaged to hourly values from one minute samples for years 2005 -
2008, Hourly values are computed from high resolution data starting in year 2009. Hourly and
daily values may not be current with high resolution data in the current year. Sampling
Frequency: varies for instantaneous sample. averaged to hourly and daily values from one
minute samples Number of sites: 1