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 las t millennium ocean variability. I have also done two previous postdocs, the firs t at the LSCE linking G reenland ice core variability to the large-scale atmospheric circulation, and th e 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)


  • 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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