Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.5194/hess-20-2975-2016
Titel (primär) A practical approach to lake water density from electrical conductivity and temperature
Autor Moreira, S.; Schultze, M.; Rahn, K.; Boehrer, B.
Quelle Hydrology and Earth System Sciences
Erscheinungsjahr 2016
Department SEEFO
Band/Volume 20
Heft 7
Seite von 2975
Seite bis 2986
Sprache englisch
UFZ Querschnittsthemen RU2;
Abstract Density calculations are essential to study stratification, circulation patterns, internal wave formation and other aspects of hydrodynamics in lakes and reservoirs. Currently, the most common procedure is the use of CTD (conductivity, temperature and depth) profilers and the conversion of measurements of temperature and electrical conductivity into density. In limnic waters, such approaches are of limited accuracy if they do not consider lake-specific composition of solutes, as we show. A new approach is presented to correlate density and electrical conductivity, using only two specific coefficients based on the composition of solutes. First, it is necessary to evaluate the lake-specific coefficients connecting electrical conductivity with density. Once these coefficients have been obtained, density can easily be calculated based on CTD data. The new method has been tested against measured values and the most common equations used in the calculation of density in limnic and ocean conditions. The results show that our new approach can reproduce the density contribution of solutes with a relative error of less than 10 % in lake waters from very low to very high concentrations as well as in lakes of very particular water chemistry, which is better than all commonly implemented density calculations in lakes. Finally, a web link is provided for downloading the corresponding density calculator.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=17697
Moreira, S., Schultze, M., Rahn, K., Boehrer, B. (2016):
A practical approach to lake water density from electrical conductivity and temperature
Hydrol. Earth Syst. Sci. 20 (7), 2975 - 2986 10.5194/hess-20-2975-2016