epi_nutr {LAGOSNE}

Epilimnion Water Quality Data

Description

A dataset containing physical and chemical observations in the epilimnion (surface waters). Each row is a sampling event, and lakes can have multiple sampling events.

Format

A data frame with observations of 93 variables:

• eventida1087: unique combination of programid, lakeid, and date for each sampling event in LAGOSNE

• lagoslakeid: unique integer identifier for each lake in LAGOSNE

• programname: name of the sampling/monitoring program that collected the data

• programtype: categorical description of the type of sampling/monitoring effort (Federal Agency, LTER = Long Term Ecological Research program, National Survey Program, Non-Profit Agency, State Agency, State Agency/Citizen Monitoring Program, State Agency/University/Citizen Monitoring Program, State Agency/Citizen Monitoring Program, Tribal Agency, University)

• lagosversion: current version of LAGOSNE that the data record belongs to

• sampledate: date at which the sample was collected, stored in date format (YYYY-MM-DD)

• chla: chlorophyll a (µg/l)

• colora: color, apparent (PCU)

• colort: color, true (PCU)

• dkn: nitrogen, dissolved Kjeldahl (µg/l as N)

• doc: carbon, dissolved organic (µg/l as C)

• nh4: nitrogen, ammonium NH4 (µg/l as N)

• no2: nitrogen, nitrite NO2 (µg/l as N)

• no2no3: nitrogen, nitrite NO2 + nitrate NO3 nitrogen (µg/l as N)

• srp: phosphorus, soluble reactive (µg/l as P)

• tdn: nitrogen, total dissolved (µg/l as N)

• tdp: phosphorus, total dissolved (µg/l as P)

• tkn: nitrogen, total Kjeldahl (µg/l as N)

• tn: nitrogen, total (µg/l as N)

• toc: carbon, total organic (µg/l as C)

• ton: nitrogen, total organic (µg/l as N)

• tp: phosphorus, total (µg/l as P)

• secchi: Secchi disk transparency (m).

• *_qual: data flags (qualifiers) from the source program for each water quality parameter (* = all water quality parameters listed above). For example, "chla_qual" is the variable name for the data flag for chlorophyll a observations.

• *_censorcode: identifies whether a data value is censored and the censor type for each water quality parameter (* = all water quality parameters listed above). For example, "chla_censorcode" is the variable name for censor information regarding chlorophyll a observations.

  • NC1: has detection limit and data value is above detection limit and has no qualifier or comments

  • NC2: has detection limit and data value is above detection limit, and has qualifier or comments

  • NC3: has no detection limit and has qualifier or comments

  • NC4: has no detection limit and has no qualifiers or comments

  • LE1: has detection limit, data value is less than or equal to detection limit, has qualifier or comments

  • LE2: has detection limit, data value is less than or equal to detection limit, has no qualifier or comments

  • LE3: has no detection limit, < than comes from source program, has qualifier or comments

  • LE4: has no detection limit, < than comes from source program, has no qualifier or comments

• *_detectionlimit: the detection limit used by the source program for each water quality parameter (* = all water quality parameters listed above). For example, "chla_detectionlimit" is the name of the variable that reports detection limits for chlorophyll a observations.

• *_labmethodname: analytical procedure, from a standards body if available for each water quality parameter (* = all water quality parameters listed above). For example, "chla_labmethodname" is the variable name for lab methods associated with each chlorophyll a observation.

• chla_methodinfo: flag to indicate variable was sampled using different methods. "CHLA_UNFILTERED" means that a sample was

• secchi_methodinfo: flag to indicate variable was sampled using different methods. "SECCHI_VIEW" means that Secchi depth was measured using a viewer box, whereas "SECCHI_VIEW_UNKNOWN" reports observations where it is unclear if a Secchi viewer box was used. A secchi observation without a methodinfo code means the Secchi depth was made without the viewer box.

• sampleyear: year (4-digit) in which sample was collected

• samplemonth: month in which sample was collected

References

Soranno et al. (2017) doi:10.1093/gigascience/gix101