Dr Pablo Ortega

Research Scientist (NCAS)

I am a postdoc researcher for NCAS-Climate, at the Department of Meteorology. My current work is focused on understanding the role of the Atlantic Ocean Meridional Overturning Circulation (AMOC) in climate and climate prediction. I obtained my PhD degree at the Universidad Complutense de Madrid as a member of the PalMA research team, analyzing last millennium ocean variability. I have also done two previous postdocs, the first at the LSCE linking Greenland ice core variability to the large-scale atmospheric circulation, and the second at LOCEAN, where I investigated the mechanisms responsible for the decadal variability in the IPSL model.

My main research interests lie on:

  • Understanding the processes that govern deep water formation, and that can potentially lead to predictability in the North Atlantic
  • The assessment of new assimilation and reconstruction techniques for the r econstruction of past AMOC variability.
  • Quantifying the role of internal climate dynamics and the external forcing on climate variability.

Research Projects

  • Dynamics and Predictability of the Atlantic Meridional Overturning and Clima te (DYNAMOC)

Publications

      In Press

    • Swingedouw D., J. Mignot, Ortega P., M. Khodri, M. Menegoz, C. Cassou, V. Hanquiez, “Impact of explosive volcanic eruptions on the main climate variability modes”, Global and Planetary Change, 150, 24-45, doi:10.1016/j.gloplacha.2017.01.006.
    • Ortega P., E. Guilyardi, D. Swingedouw, J. Mignot and S. Nguyen, “Reconstructing extreme AMOC events through nudging of the ocean surface: A perfect model approach”, Nature Geoscience (Published online), doi:10.1007/s00382-017-3521-4.
    • Guillet S., C. Corona, M. Stoffel, M. Khodri, F. Lavigne, P. Ortega, N. Eckert, P.D. Sielenou, V. Daux, O.V. Churakova (Sidorova), N. Davi, J.-L. Edouard, Y, Zhang, B. H. Luckman, V. S. Myglan, J. Guiot, M. Beniston, V. Masson-Delmotte and C. Oppenheimer, “Climate response to the Samalas volcanic eruption in 1257 revealed by proxy records”; Nature Geoscience 10,123-128, 2017, doi:10.1038/ngeo2875.
    • Hawkins E., P. Ortega, E. Suckling, A. Schurer, G. Hegerl, P. Jones, M. Joshi, T.J. Osborn, V. Masson-Delmotte, J. Mignot, P. Thorne and G.J. van Oldenborgh, “ Estimating changes in global temperature since the pre-industrial period”; BAMS (Published online), doi:10.1175/BAMS-D-16-0007.1.
  • Ortega P., J. Robson, R. Sutton and M. Andrews, “ Mechanisms of decadal variability in the Labrador Sea and the wider North Atlantic in a high-resolution climate model”, Climate Dynamics (Published online), doi:10.1007/s00382-016-3467-y.
  • Moreno-Chamarro E., P. Ortega, F. González-Rouco and M. Montoya, “Assessing reconstruction techniques of the Atlantic Ocean circulation variability during the last millennium”; Climate Dynamics (Published online), doi:10.1007/s00382-016-3111-x.
  • P. Ortega, “Atmospheric science: Clouding the warming”; Nature Geoscience (Published Online), doi:10.1038/ngeo2758.
  • Robson J., P. Ortega and R. Sutton, “A reversal of climatic trends in the North Atlantic since 2005”; Nature Geoscience 9,513-517, 2016, doi:10.1038/ngeo2727.
  • Bolliet T., P. Brockmann, V. Masson-Delmotte, F. Bassinot, V. Daux, D. Genty, A. Landais, M. Lavrieux, E. Michel, P. Ortega, C. Risi, D.M. Roche, F Vimeux and C. Waelbroeck, “Water and carbon stable isotope records from natural archives: a new database and interactive online platform for data browsing, visualizing and downloading”; Climate of the Past 12, 1693-1719, 2016, doi:10.5194/cp-12-1693-2016.
  • Mignot J., J. García-Serrano, D. Swingedouw, A. Germe, S. Nguyen, E. Guilyardi, P. Ortega and S. Ray, “Decadal predictability skill in the ocean with surface nudging”; Climate Dynamics 47, 1225-1246, 2015, doi:10.1007/s00382-015-2898-1.
  • Masson-Delmotte V., H.C. Steen-Larsen, P. Ortega, D. Swingedouw, T. Popp, B.M. Vinther, H. Oerter, A.E. Sveinbjornsdottir, J.E .Box, S.Falourd, X. Fettweis, H. Gallée, E. Garnier, J. Jouzel, A. Landais, B. Minster, N. Paradis, A. Orsi, C. Risi, M. Werner, H. Gudlaugsdottir and J.W.C. White, “Recent changes in North West Greenland climate documented by NEEM shallow ice core data and simulations, and implications for past temperature reconstructions”. The Cryosphere 9, 1481-1504, 2015, doi: 10.5194/tc-9-1481-2015.
  • Ortega P., J. Mignot, D. Swingedouw, F. Sevellec and E. Guilyardi, “Reconciling two alternative mechanisms behind bi-decadal variability in the North Atlantic”. Progress in Oceanography 137 Part A, 237-249, 2015,doi: 10.1016/j.pocean.2015.06.009.
  • Ortega P., F. Lehner, D. Swingedouw, V. Masson-Delmotte, C. Raible, M. Casado and P. Yiou, “A model-tested North Atlantic Oscillation reconstruction for the past millennium”. Nature 523, 71-74, 2015, doi: 10.1038/nature14518.
  • Zanchettin D., O. Bothe, F. Lehner, P. Ortega, D. Swingedouw and J. Jungclaus, “Reconciling reconstructed and simulated features of the winter Pacific-North-American pattern in the early 19th century”. Climate of the Past 11, 939-958, 2015, doi: 10.5194/cp-11-939-2015.
  • Swingedouw D., P. Ortega, J. Mignot, E. Guilyardi, V. Masson-Delmotte, P. G. Butler and M. Khodri, “Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions”. Nature Communications 6, 6545, 2015, doi: 10.1038/ncomms7545.

  • Ortega P., D. Swingedouw, V. Masson-Delmotte, C. Risi, B. Vinther, P. Yiou, R. Vautard and K. Yoshimura, “Characterising the atmospheric signals in Greenland ice cores: insights from the weather regime approach”. Climate Dynamics 43, pp 2585-2605, 2014, doi: 10.1007/s00382-014-2074-z.
  • Casado M., P. Ortega, V. Masson-Delmotte, C. Risi, D. Swingedouw, V. Daux, D. Genty, F. Maignan, O. Solomina, B. Vinther, N. Viovy, and P. Yiou, “Impact of precipitation intermittency on NAO-temperature signals in proxy records”, Climate of the Past 9, 871-886, 2013, doi: 10.5194/cp-9-871-2013.
  • Ortega, P., J. F. González-Rouco, M. Montoya and H. Beltrami, “Variability of the ocean heat content during the last millennium – an assessment with the ECHO-g Model”, Climate of the Past 9, 547-565, 2013, doi: 10.5194/cp-9-547-2013.
  • Ortega, P., M. Montoya, J. F. González-Rouco, J. Mignot and S. Legutke, “Variability of the Atlantic meridional overturning circulation in the last millennium and two IPCC scenarios”, Climate Dynamics 38, 1925-1947, 2012 doi: 10.1007/s00382-011-1081-6.
  • Ortega, P., E. Hawkins and R. T. Sutton, “Processes governing the predictability of the Atlantic Meridional Overturning Circulation in a coupled GCM”, Climate Dynamics 37, 1771–1782, 2011, doi: 10.1007/s00382-011-1025-1.

 

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