We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


97% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > U – salinity relationships in the Mediterranean...
View graph of relations

« Back

U – salinity relationships in the Mediterranean: implications for 234Th:238U particle flux studies.

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>08/2007
<mark>Journal</mark>Marine Chemistry
Number of pages16
<mark>Original language</mark>English


Knowledge of the 238U concentration in seawater is important for 234Th:238U disequilibrium studies of particle fluxes. However, these concentration data are normally obtained through a standard relationship between 238U and salinity, which has been determined for the open ocean. This study examines 238U data from both the open Mediterranean and the coastal Thermaikos Gulf, Greece, and compares it to the open ocean. No deviation from the open ocean 238U – salinity relationship was found for the Thermaikos Gulf, but some enhancement was noted close to Thessaloniki in the vicinity of a phosphate fertiliser plant. The open Mediterranean data showed a small enhancement relative to the open ocean. Although an analytical bias could not be ruled out, a review of 238U and salinity data in the literature shows that the standard relationship may not be as robust as is often assumed and the 1 % uncertainty typically used is not justified at the present time. Nevertheless, salinity-based derivations continue to be the most appropriate means of determining 238U concentrations for routine applications. We propose a new relationship that accounts for the uncertainties observed, i.e. 238U (dpm l-1) = (0.0713 ± 0.0012) x salinity.

Bibliographic note

The final, definitive version of this article has been published in the Journal, Marine Chemistry 106 (3-4), 2007, © ELSEVIER.