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Anais Orsi



Research Scientist  (Chercheur CEA)

Research topics


2013 : Qualification aux postes de maître de conférence, Section 36 and 37
2013 : PhD, Climate Sciences, Scripps Institution of Oceanography, University of California San Diego 
              Thesis topic: Joint inversion of 3 paleo-thermometers from WAIS divide site in Antarctica
                   to test the bipolar see saw hypothesis during the Little Ice Age. 
              Advisor: Jeff Severinghaus 
2007 : Master of Science in Oceanography, Scripps Institution of Oceanography, UC San Diego 
2005 : Master of Engineering, Ecole Polytechnique, France (class of X2002) 



39.  Servettaz, A. P. M., Orsi, A. J., Curran, M. A. J., Moy, A. D., Landais, A., & Agosta, C., et al. (2020). Snowfall and water stable isotope variability in East Antarctica controlled by warm synoptic events. Journal of Geophysical Research: Atmospheres, 125, e2020JD032863.

38. Lyu, Z., Orsi, A. J., & Goosse, H. (2020). Comparison of observed borehole temperatures in Antarctica with simulations using a forward model driven by climate model outputs covering the past millennium. Climate of the Past, 16(4), 1411-1428.

37. Konecky, B. L., McKay, N. P., Churakova (Sidorova), O. V., Comas-Bru, L., Dassié, E. P., DeLong, K. L., Falster, G. M., Fischer, M. J., Jones, M. D., Jonkers, L., Kaufman, D. S., Leduc, G., Managave, S. R., Martrat, B., Opel, T., Orsi, A. J., Partin, J. W., Sayani, H. R., Thomas, E. K., Thompson, D. M., Tyler, J. J., Abram, N. J., Atwood, A. R., Conroy, J. L., Kern, Z., Porter, T. J., Stevenson, S. L., von Gunten, L., and the Iso2k Project Members: The Iso2k Database: A global compilation of paleo-δ18O and δ2H records to aid understanding of Common Era climate, Earth Syst. Sci. Data Discuss.,, in review, 2020.

36. Kaufman, D., McKay, N., et al. incl A. Orsi (2020). A global database of Holocene paleotemperature records. Scientific Data, 7(1), 1-34.


35. Yeung, L. Y., Lee T. Murray, P. Martinerie, E. Witrant, H. Hu, A. Banerjee, A. Orsi, and J. Chappellaz. Isotopic constraint on the twentieth-century increase in tropospheric ozone. Nature 570, no. 7760, p. 224, 2019.

34. Klein, F., Abram, N. J., Curran, M. A. J., Goosse, H., Goursaud, S., Masson-Delmotte, V., Moy, A., Neukom, R., Orsi, A., Sjolte, J., Steiger, N., Stenni, B., and Werner, M.: Assessing the robustness of Antarctic temperature reconstructions over the past 2 millennia using pseudoproxy and data assimilation experiments, Clim. Past, 15, 661-684,, 2019.

33. Bréant, C., Landais, A., Orsi, A., Martinerie, P., Extier, T., Prié, F., Stenni B., Jouzel J., Masson-Delmotte V. and Leuenberger, M. (2019). Unveiling the anatomy of Termination 3 using water and air isotopes in the Dome C ice core, East Antarctica. Quaternary Science Reviews, 211, 156-165.

32. Bréant, C., Dos Santos, C. L., Agosta, C., Casado, M., Fourré, E., Goursaud, S., Orsi A. and Landais A.. (2019). Coastal water vapor isotopic composition driven by katabatic wind variability in summer at Dumont d'Urville, coastal East Antarctica. Earth and Planetary Science Letters, 514, 37-47.

31. Agosta, C., Amory, C., Kittel, C., Orsi, A., Favier, V., Gallée, H., & Fettweis, X. (2019). Estimation of the Antarctic surface mass balance using the regional climate model MAR (1979–2015) and identification of dominant processes. The Cryosphere, 13(1), 281-296.


30. Fegyveresi, J. M., Alley, R. B., Muto, A., Orsi, A. J., & Spencer, M. K. (2018). Surface formation, preservation, and history of low-porosity crusts at the WAIS Divide site, West Antarctica. Cryosphere, 12(1).

29. Bertler, N. A. N., et al., incl. A. Orsi. (2018): The Ross Sea Dipole – temperature, snow accumulation and sea ice variability in the Ross Sea region, Antarctica, over the past 2700 years, Clim. Past, 14, 193-214,, 2018.

28. Yang, J. W., Han, Y., Orsi, A. J., Kim, S. J., Han, H., Ryu, Y., ... & Ahn, J. (2018). Surface temperature in twentieth century at the Styx Glacier, northern Victoria Land, Antarctica, from borehole thermometry. Geophysical Research Letters, 45(18), 9834-9842.

27. Goursaud, S., Masson-Delmotte, V., Favier, V., Orsi, A., and Werner, M.: Water stable isotope spatio-temporal variability in Antarctica in 1960–2013: observations and simulations from the ECHAM5-wiso atmospheric general circulation model, Clim. Past, 14, 923-946,, 2018.


26. Stenni, B., Curran, M. A. J., Abram, N. J., Orsi, A., Goursaud, S., Masson-Delmotte, V., Neukom, R., Goosse, H., Divine, D., van Ommen, T., Steig, E. J., Dixon, D. A., Thomas, E. R., Bertler, N. A. N., Isaksson, E., Ekaykin, A., Werner, M., and Frezzotti, M.: Antarctic climate variability on regional and continental scales over the last 2000 years, Clim. Past, 13, 1609-1634,, 2017

25. Carlsen, T., Birnbaum, G., Ehrlich, A., Freitag, J., Heygster, G., Istomina, L., Kipfstuhl, S., Orsi, A., Schäfer, M., and Wendisch, M.: Comparison of different methods to retrieve optical-equivalent snow grain size in central Antarctica, The Cryosphere, 11, 2727-2741,, 2017

24. Petrenko V.V., A.M. Smith, H. Schaefer, K. Riedel, E. Brook, D. Baggenstos, C. Harth, Q. Hua, C.Buizert, A. Schilt, X. Fain, L.Mitchell, T. Bauska, A. Orsi, R. F. Weiss and J. P. Severinghaus, Minimal geologic methane emissions during Younger Dryas – Preboreal abrupt warming event, Nature 548, no. 7668 (2017): 443-446.

23. Emile-Geay J, McKay NP, Kaufman DS, von Gunten L, et al.; A global multiproxy database for temperature reconstructions of the Common Era. Scientific Data. 2017 May 3. doi:10.1038/sdata.2017.88

22. Bréant, C., Martinerie, P., Orsi, A., Arnaud, L., and Landais, A.: Modelling the firn thickness evolution during the last deglaciation: constrains on sensitivity to temperature and impurities, Clim. Past, 13, 833-853,, 2017.

21. Orsi A.J, K. Kawamura, V. Masson-Delmotte, X. Fettweis, J. Box, D. Dahl-Jensen, G.D Clow, A. Landais, and J.P. Severinghaus (2017), The recent warming trend in North Greenland, Geophys. Res. Lett., 44, doi:10.1002/2016GL072212

20. Lundin J.M.D, C. M. Stevens, R. Arthern, C. Buizert, A. Orsi, S. R.M. Ligtenberg, S. B. Simonsen, E. Cummings, R. Essery, W. Leahy, P. Harris, M. Helsen and E. Waddington, Firn Model Intercomparison Experiment (FirnMICE), Journal of Glaciology, 2017, 1–22. doi:10.1017/jog.2016.114


19. Landais, A., Masson-Delmotte, V., Capron, E., Langebroek, P. M., Bakker, P., Stone, E. J., Merz, N., Raible, C. C., Fischer, H., Orsi, A., Prié, F., Vinther, B., and Dahl-Jensen, D.: How warm was Greenland during the last interglacial period?, Clim. Past, 12, 1933-1948, doi:10.5194/cp-12-1933-2016, 2016.

18. Jones, Julie M., Sarah T. Gille, Hugues Goosse, Nerilie J. Abram, Pablo O. Canziani, Dan J. Charman, Kyle R. Clem, Anais Orsi et al. "Assessing recent trends in high-latitude Southern Hemisphere surface climate." Nature Climate Change 6, no. 10 (2016): 917-926.

17. Ritter, François, Hans Christian Steen-Larsen, Martin Werner, Valérie Masson-Delmotte, Anais Orsi, Melanie Behrens, Gerit Birnbaum, Johannes Freitag, Camille Risi, and Sepp Kipfstuhl. "Isotopic exchange on the diurnal scale between near-surface snow and lower atmospheric water vapor at Kohnen station, East Antarctica." The Cryosphere, 10, 1647-1663,, 2016.

16. Casado, M., Cauquoin, A., Landais, A., Israel, D., Orsi, A., Pangui, E., Landsberg, J., Kerstel, E., Prie, F. and Doussin,. (2016). Experimental determination and theoretical framework of kinetic fractionation at the water vapour–ice interface at low temperature. Geochimica et Cosmochimica Acta, 174, 54-69.

15. Petrenko, V.V., Severinghaus, J.P., Schaefer, H., Smith, A.M., Kuhl, T., Baggenstos, D., Hua, Q., Brook, E.J., Rose, P., Kulin, R. , Bauska, T., Harth C., Buizert C., Orsi A., Emanuel G., Lee J.E., Brailsford G., Keeling R., Weiss R.F. (2016). Measurements of 14 C in ancient ice from Taylor Glacier, Antarctica constrain in situ cosmogenic 14 CH 4 and 14 CO production rates. Geochimica et Cosmochimica Acta. 177 (2016): 62-77


14. WAIS Divide Project Members (2015), Precise interhemispheric phasing of the bipolar seesaw during abrupt Dansgaard-Oeschger events, Nature, 520, 661–665 (30 April 2015), doi:10.1038/nature14401

13. Mitchell, L. E., C. Buizert, E. J. Brook, D. J. Breton, J. Fegyveresi, D. Baggenstos, A. Orsi, J. Severinghaus, R. B. Alley, M. Albert, R. H. Rhodes, J. R. McConnell, M. Sigl, O. Maselli, S. Gregory, and J. Ahn (2015), Observing and modeling the influence of layering on bubble trapping in polar firn. J. Geophys. Res. Atmos., 120, 2558–2574. doi: 10.1002/2014JD022766.

12. Orsi, A. J., K. Kawamura, J.M. Fegyveresi, M.A. Headly, R. B. Alley and J. P. Severinghaus (2015), Differentiating bubble-free layers from melt layers in ice cores using noble gases, Journal of Glaciology, 61(227), 585-594 link pdf

11. Masson-Delmotte, V., Steen-Larsen, H. C., Ortega, P., Swingedouw, D., Popp, T., Vinther, B. M., Orsi A.J et al. (2015). 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, doi:10.5194/tc-9-1481-2015, 2015.


10. Souney, J.M., Twickler, M.S., Hargreaves, G.M., Bencivengo, B.M., Kippenhan, M.J., Johnson, J.A., Cravens, E.D., Neff, P.D., Nunn, R.M., Orsi, A.J., Popp, T.J., Rhoades, J.F., Vaughn, B.H., Voigt, D.E., Wong, G.J. and Taylor, K.C. (2014), Core handling and processing for the WAIS Divide ice-core project, Annals of Glaciology, 55(68), p. 15 – 26 link

9. Orsi, A. J., B. D. Cornuelle, and J. P. Severinghaus (2014), Magnitude and Temporal Evolution of Interstadial 8 Abrupt Temperature Change Inferred From inert gas isotopes in GISP2 Ice Using a New Least-Squares Inversion, EPSL, 395:81-90. link


8. WAIS Divide Project Members (2013), Onset of deglacial warming in West Antarctica driven by local orbital forcing , Nature, 500, p. 440 – 444 link

7. Petrenko V., et al. (2013), High-precision 14C measurements demonstrate production of in situ cosmogenic 14CH4 and rapid loss of in situ cosmogenic 14CO in shallow Greenland firn, EPSL, 365 190-197 link

6. NEEM community members (2013), Eemian interglacial reconstructed from a Greenland folded ice core, Nature, 493, 489–494 link

5. Steig E.J. and Orsi A.J., Climate science: The heat is on in Antarctica, Nature Geoscience, 6, 87–88, (2013) link

4. Guillevic, M., et al.,  (2013) Spatial gradients of temperature, accumulation and δ18O-ice in Greenland over a series of Dansgaard-Oeschger events, Climate of the Past 9, 1029-1051, doi:10.5194/cp-9-1029-2013. link


3. Orsi A., B. Cornuelle and J. Severinghaus (2012), Little Ice Age Cold Interval in West Antarctica: Evidence from Borehole Temperature at the West Antarctic Ice Sheet (WAIS) Divide, Geophys. Res. Let., 39, L09710. link 

2. Buizert C. et al. (2012), Gas transport in firn: multiple-tracer characterisation and model inter-comparison for NEEM, Northern Greenland, Atmospheric Chemistry and Physics, 12, 4259-4277 link


1. Battle M. O., et al. (2011), Controls on the movement and composition of firn air at the West Antarctic Ice Sheet Divide, Atmospheric Chemistry and Physics, 11(21), 11007-11021. link

Enseignement / Teaching

Current assignments:

 - Lecturer, Ecole Nationale des Techniques Avancées, “Introduction to climate change”, 7x3hr course, upper level bachelor’s level. (2017-2020)
 - Lecturer, Ecole Nationale des Mines de Paris, 3hr lecture on interglacial climate for the “climate history” course, upper level bachelor’s level. (2018-2019)
 - Lecturer, Master STEE, Université de Bordeaux, 3hr lecture on polar climate for the “past climate dynamics” course. (2014-2020)
 - Lecturer, Master Arctic Studies, U. Paris-Saclay, 3*1.5hr lectures on polar climate change (2015-2020)
 - Lecturer, ENSG Nancy, 2nd year engineering, 4h course on paleoclimate (2015-2018)

Summer 2011 :     Lecturer, SIO20: The Atmosphere, undergraduate course. 
       Used modern peer instruction teaching methods, including clickers. 35 students.

Winter 2011 :    Instructor, SIO217B: Dynamical Meteorology, graduate course. 5 students.

Winter 2011 :    Teaching assistant, SIO20: The Atmosphere. 180 students.

Fall 2008 :    Student organizer, SIO209: Food and the environment, graduate level seminar.
       Designed the course, Managed the class, Organized a field trip. 23 students.

Spring 2008 :    Communicating ocean sciences to informal audiences. 
       Developed and presented hands on science at the Birch Aquarium.

Jan - July 2003 :     Manager and instructor, literacy program for adults, Nimes, France.

Field Work

June 2017 : Firn air sampling experiment at the EGRIP deep ice coring site, Greenland (16 days).
June 2015 : Participation to the N-ICE 2015 cruise, snow physical properties measurements (25 days)
Nov 2013 – Feb 2014 :    Participation to the AWI CoFi project (PI: Sepp Kipfstuhl), borehole thermometry and investigation of surface processes in Droning Maud Land. (80 days).
July 2011 :    Borehole thermometry, NEEM ice coring project, Greenland (25 days).
Dec 2009 - Feb 2010 :    Science operations manager, West Antarctica Ice Sheet (WAIS) divide ice coring project (67 days).
July 2009 :    Ice core logger, Borehole thermometry, NEEM ice coring project, Greenland (21 days).
Nov 2008 - Jan 2009 :     Science operations manager, WAIS divide ice coring project, Antarctica (65 days).
Dec 2007 - Jan 2008 :    Core handler, Borehole thermometry, WAIS divide field camp, Antarctica (54 days).
Dec. 2005 :        Mooring deployment, Oceanographic cruise, California, USA (1 day).

Funded projects

2020-2024 : ANR Katabatic : Temporal Variability of Antarctic Katabatic Winds: climatology, driving mechanisms and impact on the water cycle, lead PI A. Orsi. 250k€

2020-2025 : ERC ICORDA : Ice CORe DAting tools revisited to infer the dynamic of glacial – interglacial transitions over the last 1.5 million years, lead PI A. Landais, A. Orsi leading WP on absolute dating of ice cores 2M€

2017-2020 : ANR EAIIST :East Antarctic International Ice Sheet Traverse, lead PI J. Savarino.  400k€

2017 : CNRS-INSU funding for instrumentation, 15k€.

2017 : IDF Region SESAME instrumentation grant to buy 2 IRMS for argon isotope measurements, 416k€, PI A. Orsi and S. Nomade

2016-2018 : CNRS LEFE ABN2K – Climate reconstruction for the past 2000 years at Aurora Basin North, Antarctica, 18k€, A. Orsi lead PI

2015-2016 : CNRS LEFE ARGON, Application of argon isotopes to dating of climate archives, 8k€, lead PI H. Guillou, co PI A.Orsi, development of absolute dating of ice cores using argon isotopes.

2013-2015 : EU-FP7 Marie-Curie IIF, TALDICE Holocene— Holocene climate variability at Talos Dome, Antarctica, 20k€ excluding salary, A. Orsi lead PI


2016 :    International rising talen prize from the L'Oréal-UNESCO for women in science foundation. 
2015 :    Prix L'Oréal-UNESCO pour les femmes et la science, Bourse France 
2014 :    Prix Le Monde de la recherche universitaire 
2013:     Marie Curie International Incoming Fellowship


2016-now : Deputy chair of the Cryosphere, Atmosphere and Climate division of the International Association of Cryospheric Sciences (IACS):

2016-now : Panoply instrument platform committee, in charge of scientific discussions and outlook.

2014-2015 : Organizer of bi-monthly paper discussion seminar across paleoclimate teams at LSCE.

Reviewer for Climate of the Past, Earth and Plantary Science letter, PNAS, The Cryosphere

2014-2015 : lead organizer of the monthly Café Science seminars at LSCE.

Selected outreach activities and media coverage

Oct 23rd 2019: 1hr Radio Interview for “La method scientifique” program on France Culture about Antarctic science.
March 12th, 2019: 1hr Radio Interview for “De Cause à Effet” on France Culture about Arctic climate change.

Oct 12th, 2017 : TV program "l'étincelle" broadcast on France 3 at 19h: 3 min presenting a discovery: link
June 6th, 2017 : Briefed French President E. Macron on climate change ; press release in the daily newspaper Le Monde. 

September 4th, 2016 : Radio interview for « les éclaireurs » on Europe 1 radio, 1hr 
2016 : web documentaire Paroles de climatologue
March 2016 : TV interview for Public Senat,  “On va plus loin”:
Dec 2015 : Science magazine article in Pour la science, "1000 ans de variations climatiques en Antarctique" 
Sept-Dec 2014 : Scientific inquiry activities with "Les Petits Débrouillards", grades 1 and 2 in Paris.
Nov 2014 : Institut de Futurs Souhaitables. 2h master class and discussion on the topic of climate change. 
Nov 2013 : Lever L’Ancre, Albert, France. 5 public lectures over two days to K-12 students and the general public on polar climate. 
2009-2013 : Birch Aquarium at Scripps Summer Camp, 1hr hands on activity on ice cores to 10-14 year olds.
8 july 2012: San Diego Union Tribune, Female scientists blazing new trails, a portrait.
29 may 2010: Wall Street Journal, Mining for Cold, Hard Facts. Article and multimedia presenting our field work at WAIS Divide.
11 august 2008: San Diego Union Tribune, Scientists seek cold, hard facts.  Article on my work on WAIS Divide







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