World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Ventilation of the Mediterranean Sea Constrained by Multiple Transient Tracer Measurements : Volume 10, Issue 3 (05/06/2014)

By Stöven, T.

Click here to view

Book Id: WPLBN0004020199
Format Type: PDF Article :
File Size: Pages 19
Reproduction Date: 2015

Title: Ventilation of the Mediterranean Sea Constrained by Multiple Transient Tracer Measurements : Volume 10, Issue 3 (05/06/2014)  
Author: Stöven, T.
Volume: Vol. 10, Issue 3
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Tanhua, T., & Stöven, T. (2014). Ventilation of the Mediterranean Sea Constrained by Multiple Transient Tracer Measurements : Volume 10, Issue 3 (05/06/2014). Retrieved from http://worldlibrary.net/


Description
Description: Helmholtz Centre for Ocean Research Kiel, GEOMAR, Kiel, Germany. Ventilation is the primary pathway for atmosphere–ocean boundary perturbations, such as temperature anomalies, to be relayed to the ocean interior. It is also a conduit for gas exchange between the interface of atmosphere and ocean. Thus it is a mechanism whereby, for instance, the ocean interior is oxygenated and enriched in anthropogenic carbon. The ventilation of the Mediterranean Sea is fast in comparison to the world ocean and has large temporal variability. Here we present transient tracer data from a field campaign in April 2011 that sampled a unique suite of transient tracers (SF6, CFC-12, 3H and 3He) in all major basins of the Mediterranean. We apply the transit time distribution (TTD) model to the data in order to constrain the mean age, the ratio of the advective / diffusive transport and the number of water masses significant for ventilation.

We found that the eastern part of the eastern Mediterranean can be reasonably described with a one-dimensional inverse Gaussian TTD (IG-TTD), and thus constrained with two independent tracers. The ventilation of the Ionian Sea and the western Mediterranean can only be constrained by a linear combination of IG-TTDs. We approximate the ventilation with a one-dimensional, two inverse Gaussian TTD (2IG-TTD) for these areas and demonstrate a possibility of constraining a 2IG-TTD from the available transient tracer data. The deep water in the Ionian Sea has a mean age between 120 and 160 years and is therefore substantially older than the mean age of the Levantine Basin deep water (60–80 years). These results are in contrast to those expected by the higher transient tracer concentrations in the Ionian Sea deep water. This is partly due to deep water of Adriatic origin having more diffusive properties in transport and formation (i.e., a high ratio of diffusion over advection), compared to the deep water of Aegean Sea origin that still dominates the deep Levantine Basin deep water after the Eastern Mediterranean Transient (EMT) in the early 1990s. The tracer minimum zone (TMZ) in the intermediate of the Levantine Basin is the oldest water mass with a mean age up to 290 years. We also show that the deep western Mediterranean has contributed approximately 40% of recently ventilated deep water from the Western Mediterranean Transition (WMT) event of the mid-2000s. The deep water has higher transient tracer concentrations than the mid-depth water, but the mean age is similar with values between 180 and 220 years.


Summary
Ventilation of the Mediterranean Sea constrained by multiple transient tracer measurements

Excerpt
Artegiani, A., Bregant, D., Paschini, E., Pinardi, N., Raicich, F., and Russo, A.: The Adriatic Sea General Circulation. Part I: Air-Sea Interactions and Water Mass Structure, J. Phys. Oceanogr., 27, 1492–1514, 1996a.; Artegiani, A., Bregant, D., Paschini, E., Pinardi, N., Raicich, F., and Russo, A.: The Adriatic Sea General Circulation. Part II: Baroclinic Circulation Structure, J. Phys. Oceanogr., 27, 1515–1532, 1996b.; Bullister, J., Wisegarver, D., and Menzia, F.: The solubility of sulfur hexafluoride in water and seawater, Deep Sea Res.-Pt. I, 49, 175–187, 2002.; Brasseur, P., Beckers, J., Brankart, J., and Schoenauen, R.: Seasonal temperature and salinity fields in the Mediterranean Sea: Climatological analyses of a historical data set, Deep Sea Res.-Pt. I, 43, 159–192, 1996.; Bullister, J. L.: Atmospheric CFC-11, CFC-12, CFC-113, CCl4 and SF6 Histories (1910–2011), Carbon Dioxide Information Analysis Center, available at: http://cdiac.ornl.gov/oceans/new_atmCFC.html (last access: 1 June 2014), 2011.; Bullister, J. L. and Wisegarver, D.: The shipboard analysis of trace levels of sulfur hexafluoride, chlorofluorocarbon-11 and chlorofluorocarbon-12 in seawater, Deep Sea Res.-Pt. I, 55, 1063–1074, 2008.; DeGrandpre, M. D., Koertzinger, A., Send, U., Wallace, D. W. R., and Bellerby, R. G. J.: Uptake and sequestration of atmospheric CO2 in the Labrador Sea deep convection region, Geophys. Res. Lett., 33, doi:10.1029/2006GL026881, 2006.; Delhez, E., de Brye, B., de Brauwere, A., and Deleersnijder, E.: Residence time vs influence time, J. Marine Syst., 132, 185–195, doi:10.1016/j.jmarsys.2013.12.005, 2013.; Dreisigacker, E. and Roether, W.: Tritium and 90Sr in North Atlantic surface water, Earth Planet. Sci. Lett., 38, 301–312, 1978.; Ferronsky, V. and Polyakov, V.: Environmental isotopes in the hydrosphere, John Wiley & Sons, Chichester, New York, 1982.; Hainbucher, D., Rubino, A., and Klein, B.: Water mass characteristics in the deep layers of the western Ionian Basin observed during May 2003, Geophys. Res. Lett., 33, L05608, doi:10.1029/2005GL025318, 2006.; Hainbucher, D., Rubino, A., Cardin, V., Tanhua, T., Schroeder, K., and Bensi, M.: Hydrographic situation during cruise M84/3 and P414 (spring 2011) in the Mediterranean Sea, Ocean Sci. Discuss., 10, 2399–2432, doi:10.5194/osd-10-2399-2013, 2013.; Haine, T. W. N. and Richards, K. J.: The influence of the seasonal mixed layer on oceanic uptake of CFCs, J. Geophys. Res.-Oceans, 100, 10727–10744, doi:10.1029/95JC00629, 1995.; Hall, T. and Plumb, R.: Age as a diagnostic of stratospheric transport, J. Geophys. Res., 99, 1059–1070, 1994.; Hall, T., Haine, T., Waugh, D., Holzer, M., Terenzi, F., and LeBel, D.: Ventilation rates Estimated from Tracers in the Presence of Mixing, J. Phys. Oceanogr., 37, 2599–2611, doi:10.1175/2006JPO3471.1, 2007.; Houghton, J., Meira Filho, L., Callander, B., Harris, N., Kattenberg, A., and Maskell, K.: Climate Change 1995, The Science of Climate Change, Cambridge University Press, 1996.; Hu, Z., Doglioli, A., Petrenko, A., Marsaleix, P., and Dekeyser, I.: Numerical simulations of eddies in the Gulf of Lion, Ocean Model., 28, 203–208, doi:10.1016/j.ocemod.2009.02.004, 2009.; Huhn, O., Rhein, M., Hoppema, M., and van Heuven, S.: Decline of deep and bottom water ventilation and slowing down of anthropogenic carbon storage in the Weddell

 

Click To View

Additional Books


  • Flow and Mixing Around a Glacier Tongue ... (by )
  • On the Fast Response of the Southern Oce... (by )
  • Assymmetric Eddy Populations in Adjacent... (by )
  • Observations of Turbulence Beneath Sea I... (by )
  • A Century of Sea Level Data and the Uk's... (by )
  • A New Assessment of the Error Budget of ... (by )
  • Arctic Ocean Circulation and Variability... (by )
  • Mixed Layer Mesoscales: a Parameterizati... (by )
  • Eddy Characteristics in the South Indian... (by )
  • Sunda Shelf Seas: Flushing Rates and Res... (by )
  • Net Primary Productivity, Upwelling and ... (by )
  • Assimilation of Sla Along Track Observat... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.