View source for Characteristic Numbers of Potential Energy Anomaly (independent of tides)

[[de: Tideunabhängige Kennwerte der Anomalie der Potentiellen Energie]]
[[Category: Characteristic Numbers (independent of the presence of tides)]]

==Motivation==
Calculation and graphic display of several tide-independent characteristic numbers of potential energy anomaly (PEA) can yield additional insight into salinity related phenomena of natural coastal and/or inland [[waters]]. In contrast to the computation of the [[Tidal Characteristic Numbers of Potential Energy Anomaly|tidal characteristic numbers of potential energy anomaly]] the tide-independent numbers can be preferable used for
* natural [[waters]] which are not dominated by the tides, e.g. like the [[coastal waters]] and estuaries along the Baltic Sea coast of Germany, or in
* extreme situations, like for example periods of high or low fresh water [[runoff]], when PEA may deviate strongly from the average (tide-dominated) conditions, as well as for the
* determination of characteristic values of PEA for an arbitrary long (or short) period of time. 

'''Analysis of tide-independent characteristic numbers of potential energy anomaly data is carried through by the computer program [[NCANALYSE]].'''

==Definitions for the tide-independent characteristic numbers of potential energy anomaly==

===Maximum Value of PEA===
Highest (local) value of PEA within the [[period of data analysis]].<br />

===Maximum valid PEA===
Highest valid (local) value of PEA within an arbitrary period of time, computed out of a time serie which may contain invalid data due to different reasons (drying, instrument failure, etc.).<br />

===Minimum Value of PEA===
Lowest (local) value of PEA within the [[period of data analysis]].<br />

===Minimum valid PEA===
Lowest valid (local) value of PEA within an arbitrary period of time, computed out of a time serie which may contain invalid data due to different reasons (drying, instrument failure, etc.).<br />

===Mean Value of PEA===
Mean value of PEA within the [[period of data analysis]].<br />

===Maximum PEA Difference===
Difference in PEA between maximum and minimum value within the [[period of data analysis]].<br />

===Standard Deviation of PEA===
Standard deviation of PEA within the [[period of data analysis]].<br />
Computed for permanently flooded areas only.<br />

===Variance of PEA===
Variance of PEA within the [[period of data analysis]].<br />
Computed for permanently flooded areas only.<br />

===Relative Frequency Distribution of PEA===
Relative frequency of PEA within given PEA intervals.<br />

===Cumulative Frequency Distribution of PEA===
Cumulative frequency of PEA within given salinity intervals.<br />

===Quantiles of PEA===
PEA value of a time series which is not exceeded of a certain percentage of present PEA values. <br />
Computed for permanently flooded areas only.<br />

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