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Glossary
nonlabile monomeric aluminum: Operationally defined as aluminum
that passes through a cation exchange column and is then measured by one of the two extraction procedures used to measure
monomeric aluminum; assumed to represent organic monomeric
aluminum (Al o ).
occult deposition: The removal of gases and particles from the atmosphere to
surfaces by fog or mist.
organic acids: Heterogeneous group of acids generally possessing a carboxyl
(–COOH) group or phenolic (C–OH) group.
parameter: (1) A characteristic factor that remains at a constant value during
the analysis or (2) a quantity that describes a statistical population
attribute.
pH: The negative logarithm of the hydrogen ion activity. The pH scale is
generally presented from 1 (most acidic) to 14 (most alkaline); a difference of one pH unit indicates a 10-fold change in hydrogen ion
activity.
phytoplankton: The plant-like forms of plankton. These single-cell organisms
are the principal agents of photosynthetic carbon fixation in some
freshwaters.
plankton: Small (often microscopic) plant-like or animal species that spend
part or all of their lives in open water.
PnET-BGC: Photosynthesis and Evapotranspiration–Biogeochemistry Model;
a model of water, carbon, and nitrogen balance coupled with a biogeochemistry model.
pool: In ecological systems, the supply of an element or compound, such as
exchangeable or weatherable cations or adsorbed sulfate, in a defined
component of the ecosystem.
population: For the purpose of this report, (1) the total number of lakes or
streams within a given geographical region or the total number of
lakes or streams with a given set of defined chemical, physical, or biological characteristics; or (2) an assemblage of organisms of the same
species inhabiting a given ecosystem.
precision: A measure of the capacity of a method to provide reproducible measurements of a particular analyte (often represented by
variance).
primary productivity: All forms of production accomplished by plants.
quality assurance: A system of activities for which the purpose is to provide
assurance that a product (e.g., database) meets a defined standard of
quality with a stated level of confidence.
quality control: Steps taken during sample collection and analysis to ensure
that data quality meets the minimum standards established in a quality assurance plan.
Glossary
nonlabile monomeric aluminum: Operationally defined as aluminum
that passes through a cation exchange column and is then measured by one of the two extraction procedures used to measure
monomeric aluminum; assumed to represent organic monomeric
aluminum (Al o ).
occult deposition: The removal of gases and particles from the atmosphere to
surfaces by fog or mist.
organic acids: Heterogeneous group of acids generally possessing a carboxyl
(–COOH) group or phenolic (C–OH) group.
parameter: (1) A characteristic factor that remains at a constant value during
the analysis or (2) a quantity that describes a statistical population
attribute.
pH: The negative logarithm of the hydrogen ion activity. The pH scale is
generally presented from 1 (most acidic) to 14 (most alkaline); a difference of one pH unit indicates a 10-fold change in hydrogen ion
activity.
phytoplankton: The plant-like forms of plankton. These single-cell organisms
are the principal agents of photosynthetic carbon fixation in some
freshwaters.
plankton: Small (often microscopic) plant-like or animal species that spend
part or all of their lives in open water.
PnET-BGC: Photosynthesis and Evapotranspiration–Biogeochemistry Model;
a model of water, carbon, and nitrogen balance coupled with a biogeochemistry model.
pool: In ecological systems, the supply of an element or compound, such as
exchangeable or weatherable cations or adsorbed sulfate, in a defined
component of the ecosystem.
population: For the purpose of this report, (1) the total number of lakes or
streams within a given geographical region or the total number of
lakes or streams with a given set of defined chemical, physical, or biological characteristics; or (2) an assemblage of organisms of the same
species inhabiting a given ecosystem.
precision: A measure of the capacity of a method to provide reproducible measurements of a particular analyte (often represented by
variance).
primary productivity: All forms of production accomplished by plants.
quality assurance: A system of activities for which the purpose is to provide
assurance that a product (e.g., database) meets a defined standard of
quality with a stated level of confidence.
quality control: Steps taken during sample collection and analysis to ensure
that data quality meets the minimum standards established in a quality assurance plan.