引用本文:  Pavel P. Sherstyankin,Lubov N. Kuimova,Vladimir L. Potemkin.确定深淡水湖泊的位温与密度.湖泊科学,1998,10(s1):261266. DOI:10.18307/1998.sup28 
 Pavel P. Sherstyankin,Lubov N. Kuimova,Vladimir L. Potemkin.Determination of Potential Temperature and Density for Deep Fresh Waters. J. Lake Sci.1998,10(s1):261266. DOI:10.18307/1998.sup28 




摘要: 
As a rule, the hydrodynamic modeling of processes in fresh waters is performed with the use of potential temperature θ and potential density ρ^{*}. However, the formulae of potential temperature for natural waters given by Phillips (1977), Gill (1982) and others take into account only adiabatic correction. They do not consider such important characteristics of natural waters as temperature of maximal density T_{md} (S,P) remoting of real temperatures T(S,P) in situ from T_{md} (T T_{md}), changes of Tmd with decreasing of pressure P (depth Z), and the equation of water state. T_{md}=T_{md}(P) is the property of molecular structures of water (Horne, 1969). It is determined by the equation of water state:for example, for lacustrine waters in the form of Chen, Millero, (1986) ρ=ρ(S,T,P), where ρ,S are density and salinity natural water. There is given and discussed a new formula for the calculation of potential temperature. It is established that potential densities calculated according to the new formula suggested by us show the entire thermodynamic similarity of characteristics within T in situ. It is not observed while using the old formulae. 
关键词: potential temperature density deep fresh waters Lake Baikal 
DOI：10.18307/1998.sup28 
分类号: 
基金项目:Research was supported by grants Russian Foundation of Basic Researches (960565850 and 960565997). 

Determination of Potential Temperature and Density for Deep Fresh Waters 
Pavel P. Sherstyankin, Lubov N. Kuimova, Vladimir L. Potemkin

Limnological Institute, Siberian Division, Russian Academy of Sciences, Russia

Abstract: 
As a rule, the hydrodynamic modeling of processes in fresh waters is performed with the use of potential temperature θ and potential density ρ^{*}. However, the formulae of potential temperature for natural waters given by Phillips (1977), Gill (1982) and others take into account only adiabatic correction. They do not consider such important characteristics of natural waters as temperature of maximal density T_{md} (S,P) remoting of real temperatures T(S,P) in situ from T_{md} (T T_{md}), changes of Tmd with decreasing of pressure P (depth Z), and the equation of water state. T_{md}=T_{md}(P) is the property of molecular structures of water (Horne, 1969). It is determined by the equation of water state:for example, for lacustrine waters in the form of Chen, Millero, (1986) ρ=ρ(S,T,P), where ρ,S are density and salinity natural water. There is given and discussed a new formula for the calculation of potential temperature. It is established that potential densities calculated according to the new formula suggested by us show the entire thermodynamic similarity of characteristics within T in situ. It is not observed while using the old formulae. 
Key words: potential temperature density deep fresh waters Lake Baikal 



