Oceanography The Official Magazine of
The Oceanography Society
Volume 29 Issue 04

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Volume 29, No. 4
Pages 196 - 206

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HyMeX-SOP2: The Field Campaign Dedicated to Dense Water Formation in the Northwestern Mediterranean

By Claude Estournel , Pierre Testor, Isabelle Taupier-Letage, Marie-Noelle Bouin, Laurent Coppola , Pierre Durand, Pascal Conan, Anthony Bosse, Pierre-Etienne Brilouet, Laurent Beguery, Sophie Belamari, Karine Béranger, Jonathan Beuvier , Denis Bourras , Guylaine Canut, Alexis Doerenbecher, Xavier Durrieu de Madron, Fabrizio D’Ortenzio, Philippe Drobinski, Véronique Ducrocq, Nadia Fourrié, Hervé Giordani, Loïc Houpert, Laurent Labatut, Cindy Lebeaupin Brossier, Mathieu Nuret, Louis Prieur, Odile Roussot , Leo Seyfried, and Samuel Somot  
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Article Abstract

The HYdrological cycle in the Mediterranean Experiment (HyMeX) Special Observing Period 2 (SOP2, January 27–March 15, 2013) was dedicated to the study of dense water formation in the Gulf of Lion in the northwestern Mediterranean. This paper outlines the deep convection of winter 2012–2013 and the meteorological conditions that produced it. Alternating phases of mixing and restratification are related to periods of high and low heat losses, respectively. High-resolution, realistic, three-dimensional models are essential for assessing the intricacy of buoyancy fluxes, horizontal advection, and convective processes. At the submesoscale, vertical velocities resulting from symmetric instabilities of the density front bounding the convection zone are crucial for ventilating the deep ocean. Finally, concomitant atmospheric and oceanic data extracted from the comprehensive SOP2 data set highlight the rapid, coupled evolution of oceanic and atmospheric boundary layer characteristics during a strong wind event.

Citation

Estournel, C., P. Testor, I. Taupier-Letage, M.-N. Bouin, L. Coppola, P. Durand, P. Conan, A. Bosse, P.-E. Brilouet, L. Beguery, S. Belamari, K. Béranger, J. Beuvier, D. Bourras, G. Canut, A. Doerenbecher, X. Durrieu de Madron, F. D’Ortenzio, P. Drobinski, V. Ducrocq, N. Fourrié, H. Giordani, L. Houpert, L. Labatut, C.L. Brossier, M. Nuret, L. Prieur, O. Roussot, L. Seyfried, and S. Somot. 2016. HyMeX-SOP2: The field campaign dedicated to dense water formation in the northwestern Mediterranean. Oceanography 29(4):196–206, https://doi.org/10.5670/oceanog.2016.94.

References
    Andreas, E.L., P.O.G. Persson, and J.E. Hare. 2008. A bulk turbulent air-sea flux algorithm for high-wind, spray conditions. Journal of Physical Oceanography 38:1,581–1,596, https://doi.org/​10.1175/2007JPO3813.1.
  1. Belamari, S., and A. Pirani. 2007. Validation of the optimal heat and momentum fluxes using the ORCA-LIM global ocean-ice model. MERSEA IP Deliverable, D.4.1.3, 88 pp. 
  2. Bignami, F., S. Marullo, R. Santoleri, and M.E. Schinao. 1995. Longwave radiation budget in the Mediterranean Sea. Journal of Geophysical Research 100(C2):2,501–2,514, https://doi.org/​10.1029/94JC02496.
  3. Bosse, A., P. Testor, L. Houpert, P. Damien, L. Prieur, D. Hayes, V. Taillandier, X. Durrieu de Madron, F. D’Ortenzio, L. Coppola, and others. 2016. Scales and dynamics of submesoscale coherent vortices formed by deep convection in the northwestern Mediterranean Sea. Journal of Geophysical Research 121, https://doi.org/10.1002/2016JC012144.
  4. Bourras, D., A. Weill, G. Caniaux, L. Eymard, B. Bourlès, S. Letourneur, D. Legain, E. Key, F. Baudin, B. Piguet, and others. 2009. Turbulent air-sea fluxes in the Gulf of Guinea during the AMMA experiment. Journal of Geophysical Research 114, C04014, https://doi.org/10.1029/​2008JC004951.
  5. Callies, J., R. Ferrari, J.M. Klymak, and J. Gula. 2015. Seasonality in submesoscale turbulence. Nature Communications 6, 6862, https://doi.org/10.1038/ncomms7862.
  6. Canut, G., M. Lothon, F. Saïd, and F. Lohou. 2010. Observation of entrainment at the interface between monsoon flow and the Saharan Air Layer. Quarterly Journal of the Royal Meteorological Society 136:34–46, https://doi.org/10.1002/qj.471. 
  7. Doerenbecher, A., C. Basdevant, P. Drobinski, P. Durand, C. Fesquet, F. Bernard, P. Cocquerez, N. Verdier, and A. Vargas. 2016. Low atmosphere drifting balloons: Platforms for environment monitoring and forecast improvement. Bulletin of the American Meteorological Society 97:1,583–1,599, https://doi.org/10.1175/BAMS-D-14-00182.1.
  8. Drobinski, P., V. Ducrocq, P. Alpert, E. Anagnostou, K. Béranger, M. Borga, I. Braud, A. Chanzy, S. Davolio, G. Delrieu, and others. 2014. HyMeX: A 10-year multidisciplinary program on the Mediterranean water cycle. Bulletin of the American Meteorological Society 95:1,063–1,082, https://doi.org/10.1175/BAMS-D-12-00242.1.
  9. Ducrocq, V., I. Braud, S. Davolio, R. Ferretti, C. Flamant, A. Jansa, N. Kalthoff, E. Richard, I. Taupier-Letage, P.A. Ayral, and others. 2014. HyMeX-SOP1: The field campaign dedicated to heavy precipitation and flash-flooding in the Northwestern Mediterranean. Bulletin of the American Meteorological Society 95:1,083–1,100, https://doi.org/10.1175/BAMS-D-12-00244.1. 
  10. Estournel, C., P. Testor, P. Damien, F. D’Ortenzio, P. Marsaleix, P. Conan, F. Kessouri, X. Durrieu de Madron, L. Coppola, J.M. Lellouche, and others. 2016. High resolution modeling of dense water formation in the north-western Mediterranean during winter 2012–2013: Processes and budget. Journal of Geophysical Research 121(7):5,367–5,392, https://doi.org/10.1002/2016JC011935.
  11. Fairall, C.W, E.F. Bradley, J.E. Hare, A.A. Grachev, and J.B. Edson. 2003. Bulk parameterization of air-sea fluxes: Updates and verification for the COARE algorithm. Journal of Climate 16:571–591, https://doi.org/10.1175/1520-0442(2003)016​<0571:BPOASF>2.0.CO;2.
  12. Fourrié, N., E. Bresson, M. Nuret, C. Jany, P. Brousseau, A. Doerenbecher, M. Kreitz, O. Nuissier, E. Sevault, H. Bénichou, and others. 2015. AROME-WMED, a real-time mesoscale model designed for the HyMeX special observation periods. Geoscientific Model Development 8:1,919–1,941, https://doi.org/10.5194/gmd-8-1919-2015.
  13. Giordani, H., L. Prieur, and G. Caniaux. 2006. Advanced insights into sources of vertical velocity in the ocean. Ocean Dynamics 56(5–6):513–524, https://doi.org/10.1007/s10236-005-0050-1.
  14. Hauser, D., H. Branger, S. Bouffies-Cloché, S. Despiau, W. Drennan, H. Dupuis, P. Durand, X. Durrieu de Madron, C. Estournel, L. Eymard, and others. 2003. The FETCH experiment: An overview. Journal of Geophysical Research 108, 8053, https://doi.org/​10.1029/2001JC001202.
  15. Herrmann, M., S. Somot, F. Sevault, C. Estournel, and M. Déqué. 2008. Modeling the deep convection in the northwestern Mediterranean Sea using an eddy-permitting and an eddy-resolving model: Case study of winter 1986–1987. Journal of Geophysical Research 113, C04011, https://doi.org/10.1029/2006JC003991.
  16. Houpert, L., X. Durrieu de Madron, P. Testor, A. Bosse, F. D’Ortenzio, M.N. Bouin, D. Dausse, H. Le Goff, S. Kunesch, M. Labaste, and others. 2016. Observations of open-ocean deep convection in the northwestern Mediterranean Sea: Seasonal and interannual variability of mixing and deep water masses for the 2007–2013 period. Journal of Geophysical Research 121, https://doi.org/10.1002/2016JC011857.
  17. Marsaleix, P., F. Auclair, T. Duhaut, C. Estournel, C. Nguyen, and C. Ulses. 2012. Alternatives to the Robert-Asselin filter. Ocean Modelling 41:53–66, https://doi.org/10.1016/j.ocemod.2011.11.002.
  18. Marshall, J., and F. Schott. 1999. Open-ocean convection: Observations, theory, and models. Reviews of Geophysics 37(1):1–64, https://doi.org/​10.1029/98RG02739.
  19. MEDOC Group. 1970. Observations of formation of deep-water in the Mediterranean Sea, 1969. Nature 227:1,037–1,040, https://doi.org/​10.1038/2271037a0.
  20. Mertens, C., and F. Schott. 1998. Interannual variability of deep-water formation in the northwestern Mediterranean. Journal of Physical Oceanography 28:1,410–1,424, https://doi.org/​10.1175/1520-0485(1998)028<1410:IVODWF>​2.0.CO;2.
  21. Moon, I.J., I. Ginis, T. Hara, and B. Thomas. 2007. A physics-based parameterization of air-sea momentum flux at high wind speeds and its impact on hurricane intensity predictions. Monthly Weather Review 135:2,869–2,878, https://doi.org/10.1175/MWR3432.1.
  22. Oost, W.A., G.J. Komen, C.M.J. Jacobs, and C. Van Oort. 2002. New evidence for a relation between wind stress and wave age from measurements during ASGAMAGE. Boundary-Layer Meteorology 103:409–438, https://doi.org/10.1023/A:1014913624535.
  23. Send, U., J. Font, and C. Mertens. 1996. Recent observation indicates convection’s role in deep water circulation. Eos, Transactions American Geophysical Union 77(7):61–65, https://doi.org/​10.1029/96EO00040.
  24. Somot, S., L. Houpert, F. Sevault, P.Testor, A. Bosse, I. Taupier-Letage, M.N. Bouin, R. Waldman, C. Cassou, E. Sanchez-Gomez, and others. 2016. Characterizing, modelling and understanding the climate variability of the deep water formation in the north-western Mediterranean Sea. Climate Dynamics, https://doi.org/10.1007/s00382-016-3295-0.
  25. Taylor, P.K., and M.J. Yelland. 2001. The dependence of sea surface roughness on the height and steepness of the waves. Journal of Physical Oceanography 31:572–590, https://doi.org/​10.1175/1520-0485(2001)031<0572:TDOSSR>​2.0.CO;2.
  26. Testor, P., and J.C. Gascard. 2006. Post-convection spreading phase in the northwestern Mediterranean Sea. Deep Sea Research Part I 53:869–893, https://doi.org/10.1016/​j.dsr.2006.02.004.
  27. Thomas, L.N., J.R. Taylor, R. Ferrari, and T.M. Joyce. 2013. Symmetric instability in the Gulf Stream. Deep Sea Research Part II 91:96–110, https://doi.org/10.1016/j.dsr2.2013.02.025.
  28. Visbeck, M., J. Marshall, and H. Jones. 1996. Dynamics of isolated convective regions in the ocean. Journal of Physical Oceanography 26:1,721–1,734, https://doi.org/​10.1175/1520-0485(1996)026<1721:DOICRI>​2.0.CO;2.
  29. Waldman, R., S. Somot, M. Herrmann, P. Testor, C. Estournel, F. Sevault, L. Prieur, L. Mortier, L. Coppola, V. Taillandier, and others. 2016. Estimating dense water volume and its evolution for the year 2012–2013 in the North-western Mediterranean Sea: An Observing System Simulation Experiment approach. Journal of Geophysical Research 121:6,696–6,716, https://doi.org/10.1002/2016JC011694.
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