Marcell Experimental Forest weekly or biweekly streamwater chemistry at the S5 catchment, 1989 - ongoing

This data set is a record since 1989 of stream water chemistry draining the S5 catchment at the Marcell Experimental Forest (MEF) in Itasca County, Minnesota. Unfiltered water is usually collected every one or two weeks as part of the long-term monitoring program of the S5 catchment. Some samples were collected more often for various other studies and are included in this data set. Samples are measured for pH, specific conductivity, anions (chloride, sulfate), cations (calcium, magnesium, potassium, sodium, aluminum, iron, manganese, strontium), silicon, nutrients (ammonium, nitrate, soluble reactive phosphorus, total nitrogen, total phosphorus), and total organic carbon. Water temperature and stream stage at the time of sampling was usually measured. Streamflow is calculated from stream stage. Occasionally, stable water isotopes were measured. Ultraviolet (UV) absorbance, a measure of water color or dissolved organic matter optical properties, was also measured for some samples. More solutes and values will be added as additional metadata are documented, water samples are collected and analyzed (concentrations and isotopes), or archived water samples are analyzed for stable water isotopes. The MEF is operated and maintained by the USDA Forest Service, Northern Research Station.