{"title":"Calculation of the potential temperature of seawater from the effect of pressure on entropy","authors":"Alvin Bradshaw","doi":"10.1016/0146-6291(78)90018-8","DOIUrl":null,"url":null,"abstract":"<div><p>A method of calculating the potential temperature using the pressure integral of the temperature derivative of specific volume is described. The estimation of the uncertainty due to errors in the thermal expansion and specific heat data is straightforward. A comparison is made with values found by <span>Bryden</span> (<em>Deep-Sea Research</em>, <strong>20</strong>, 401–408, 1973) from integration of the adiabatic gradient, the same expressions for the temperature derivative and the specific heat being used in both cases. The results agree within the fitting error in Bryden's polynomial for potential temperature at 35% salinity by Bryden's estimate of the uncertainty in his values is too large. From this analysis, the uncertainty in values of potential temperature in the oceanographic range is estimated to be less than 12 m°C.</p></div>","PeriodicalId":100360,"journal":{"name":"Deep Sea Research","volume":"25 12","pages":"Pages 1253-1257"},"PeriodicalIF":0.0000,"publicationDate":"1978-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0146-6291(78)90018-8","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Deep Sea Research","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0146629178900188","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3
Abstract
A method of calculating the potential temperature using the pressure integral of the temperature derivative of specific volume is described. The estimation of the uncertainty due to errors in the thermal expansion and specific heat data is straightforward. A comparison is made with values found by Bryden (Deep-Sea Research, 20, 401–408, 1973) from integration of the adiabatic gradient, the same expressions for the temperature derivative and the specific heat being used in both cases. The results agree within the fitting error in Bryden's polynomial for potential temperature at 35% salinity by Bryden's estimate of the uncertainty in his values is too large. From this analysis, the uncertainty in values of potential temperature in the oceanographic range is estimated to be less than 12 m°C.
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