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Causes of long-term changes in Aegean sea deep water ArchiMer
Boscolo, R; Bryden, H.
Recent observations of newly formed deep water in the Aegean sea prompts this analysis of whether such deep water could be formed locally by the combination of an increase in net evaporation and wintertime water mass transformation. River diversion projects in Russia and Egypt since the 1950s have effectively increased the amount of net evaporation over the eastern Mediterranean basin. Historical profiles show that low salinity intermediate waters separated the deep and upper waters in the Aegean in 1961-1962. Within a simple mixed layer model, imposing a small net evaporation of 10 cm.yr(-1) on the observed hydrographic conditions in March 1962 results in the gradual erosion of the low salinity intermediate waters. After 25 years, the low salinity...
Tipo: Text Palavras-chave: Échanges océan-atmosphère; Formation d’eau profonde; Circulation en Méditerranée; Budget hydrologique; Mer Égée; Air-sea interaction; Deep water formation; Mediterranean circulation; Hydrological budget; Aegean sea.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43329/42898.pdf
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Characterizing, modelling and understanding the climate variability of the deep water formation in the North-Western Mediterranean Sea ArchiMer
Somot, Samuel; Houpert, Loic; Sevault, Florence; Testor, Pierre; Bosse, Anthony; Taupier-letage, Isabelle; Bouin, Marie-noelle; Waldman, Robin; Cassou, Christophe; Sanchez-gomez, Emilia; Durrieu De Madron, Xavier; Adloff, Fanny; Nabat, Pierre; Herrmann, Marine.
Observing, modelling and understanding the climate-scale variability of the deep water formation (DWF) in the North-Western Mediterranean Sea remains today very challenging. In this study, we first characterize the interannual variability of this phenomenon by a thorough reanalysis of observations in order to establish reference time series. These quantitative indicators include 31 observed years for the yearly maximum mixed layer depth over the period 1980–2013 and a detailed multi-indicator description of the period 2007–2013. Then a 1980–2013 hindcast simulation is performed with a fully-coupled regional climate system model including the high-resolution representation of the regional atmosphere, ocean, land-surface and rivers. The simulation reproduces...
Tipo: Text Palavras-chave: Deep water formation; Open-sea deep convection; Interannual variability; Mediterranean Sea; Regional climate models; Climate trends.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00348/45948/45654.pdf
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Oxygen Saturation Surrounding Deep Water Formation Events in the Labrador Sea From Argo-O-2 Data ArchiMer
Wolf, Mitchell K.; Hamme, Roberta C.; Gilbert, Denis; Yashayaev, Igor; Thierry, Virginie.
Deep water formation supplies oxygen-rich water to the deep sea, spreading throughout the ocean by means of the global thermohaline circulation. Models suggest that dissolved gases in newly formed deep water do not come to equilibrium with the atmosphere. However, direct measurements during wintertime convection are scarce, and the controls over the extent of these disequilibria are poorly quantified. Here we show that, when convection reached deeper than 800 m, oxygen in the Labrador Sea was consistently undersaturated at -6.1% to -7.6% at the end of convection. Deeper convection resulted in greater undersaturation, while convection ending later in the year resulted in values closer to equilibrium, from which we produce a predictive relationship. We use...
Tipo: Text Palavras-chave: Oxygen saturation; Convection; Argo; Labrador Sea; Deep water formation.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00442/55329/56829.pdf
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