Salinity inversions in the thermocline under upwelling favorable winds

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dc.identifier.uri http://dx.doi.org/10.15488/1661
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/1686
dc.contributor.author Burchard, Hans
dc.contributor.author Basdurak, N.Berkay
dc.contributor.author Gräwe, Ulf
dc.contributor.author Knoll, Michaela
dc.contributor.author Mohrholz, Volker
dc.contributor.author Müller, Selina
dc.date.accessioned 2017-06-21T13:23:20Z
dc.date.available 2017-06-21T13:23:20Z
dc.date.issued 2017
dc.identifier.citation Burchard, H.; Basdurak, N.B.; Gräwe, U.; Knoll, M.; Mohrholz, V. et al.: Salinity inversions in the thermocline under upwelling favorable winds. In: Geophysical Research Letters 44 (2017), Nr. 3, S. 1422-1428. DOI: https://doi.org/10.1002/2016GL072101
dc.description.abstract This paper discusses and explains the phenomenon of salinity inversions in the thermocline offshore from an upwelling region during upwelling favorable winds. Using the nontidal central Baltic Sea as an easily accessible natural laboratory, high-resolution transect and station observations in the upper layers are analyzed. The data show local salinity minima in the strongly stratified seasonal thermocline during summer conditions under the influence of upwelling favorable wind. A simple analytical box model using parameters (including variation by means of a Monte Carlo method) estimated from a hindcast model for the Baltic Sea is constructed to explain the observations. As a result, upwelled water with high salinity and low temperature is warmed up due to downward surface heat fluxes while it is transported offshore by the Ekman transport. The warming of upwelled surface water allows maintenance of stable stratification despite the destabilizing salinity stratification, such that local salinity minima in the thermocline can be generated. Inspection of published observations from the Benguela, Peruvian, and eastern tropical North Atlantic upwelling systems shows that also there salinity inversions occur in the thermocline, but in these cases thermocline salinity shows local maxima, since upwelled water has a lower salinity than the surface water. It is hypothesized that thermocline salinity inversions should generally occur offshore from upwelling regions whenever winds are steady enough and surface warming is sufficiently strong. eng
dc.description.sponsorship DFG/CRC/TRR 181
dc.language.iso eng
dc.publisher Hoboken, NJ : Wiley-Blackwell Publishing, Inc.
dc.relation.ispartofseries Geophysical Research Letters 44 (2017), Nr. 3
dc.rights CC BY-NC-ND 4.0
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject Ekman transport eng
dc.subject Salinity inversions eng
dc.subject Thermocline eng
dc.subject Upwelling eng
dc.subject Heat flux eng
dc.subject Monte Carlo methods eng
dc.subject Surface waters eng
dc.subject Temperature eng
dc.subject Temperature distribution eng
dc.subject Wind eng
dc.subject Eastern tropical north atlantic eng
dc.subject Ekman transport eng
dc.subject Natural laboratories eng
dc.subject Salinity inversions eng
dc.subject Salinity stratification eng
dc.subject Seasonal thermocline eng
dc.subject Stable stratification eng
dc.subject Upwelling eng
dc.subject Stream flow eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.title Salinity inversions in the thermocline under upwelling favorable winds
dc.type article
dc.type Text
dc.relation.issn 0094-8276
dc.relation.doi https://doi.org/10.1002/2016GL072101
dc.bibliographicCitation.issue 3
dc.bibliographicCitation.volume 44
dc.bibliographicCitation.firstPage 1422
dc.bibliographicCitation.lastPage 1428
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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