I am a Researcher in Paleoceanography at the Department of Earth Science, University of Bergen and the Bjerknes Centre for Climate Research. The main motivation of my research is to understand the mechanisms behind past changes in ocean circulation and climate during the current and previous warm periods, to provide a better understanding and improve the predictions of our future climate.

To accomplish this, I work with an array of proxy methodologies including foraminiferal assemblages, stable isotopes (e.g., planktonic and benthic foraminiferal δ¹⁸O and δ¹³C) and elemental ratios (e.g., Mg/Ca) to reconstruct surface and deep ocean properties, ice-rafted debris counts to reconstruct ice sheet variability, sortable silt analysis to reconstruct relative changes in paleo-current flow speed; combined with tephra, oceanic ¹³C Suess effect and SCP analysis for improving recent marine sediment core chronologies.

Academic article

• Irvali, Nil; Ninnemann, Ulysses S; Olsen, Are et al. (2024). Revising chronological uncertainties in marine archives using global anthropogenic signals: a case study on the oceanic ¹³C Suess effect. (external link)
• Sproson, Adam D.; Yokoyama, Yusuke; Miyairi, Yosuke et al. (2024). Near-synchronous Northern Hemisphere and Patagonian Ice Sheet variation over the last glacial cycle. (external link)
• Pienkowski, Anna; Husum, Katrine; Furze, Mark F.A. et al. (2022). Revised ΔR values for the Barents Sea and its archipelagos as a pre-requisite for accurate and robust marine-based 14C chronologies. (external link)
• Clementi, Vincent J.; Rosenthal, Yair; Bova, Samantha C. et al. (2022). Deep submarine infiltration of altered geothermal groundwater on the south Chilean Margin. (external link)
• Li, Chen; Clementi, Vincent J.; Bova, Samantha C et al. (2022). The Sediment Green-Blue Color Ratio as a Proxy for Biogenic Silica Productivity Along the Chilean Margin. (external link)
• Irvali, Nil; Galaasen, Eirik Vinje; Ninnemann, Ulysses S et al. (2020). A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Kessler, Augustin et al. (2020). Interglacial instability of North Atlantic Deep Water ventilation. (external link)
• Rohling, E.J.; Hibbert, F.D.; Grant, K.M. et al. (2019). Asynchronous Antarctic and Greenland ice-volume contributions to the last interglacial sea-level highstand. (external link)
• Morley, Audrey; Balbila, Tali L.; Wright, James et al. (2017). Environmental Controls on Mg/Ca in Neogloboquadrina incompta: A Core-Top Study From the Subpolar North Atlantic. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Kleiven, Helga Flesche et al. (2016). Evidence for regional cooling, frontal advances, and East Greenland Ice Sheet changes during the demise of the last interglacial. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2015). Deep Atlantic variability during the last interglacial period. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2014). Rapid reductions in North Atlantic Deep Water during the peak of the last Interglacial period. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Galaasen, Eirik Vinje et al. (2012). Rapid switches in subpolar North Atlantic hydrography and climate during the Last Interglacial (MIS 5e). (external link)

Academic lecture

• Irvali, Nil; Ninnemann, Ulysses S; Liltved, Allegra et al. (2023). Holocene Natural Variability in Atlantic Water Inflow Properties to the Arctic. (external link)
• Ninnemann, Ulysses S; Irvali, Nil; Lefevere, Simon Pierre et al. (2023). Unravelling the Link between Arctic-Atlantic Exchanges and Meridional Overturning Circulation during the last Deglaciation. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Jansen, Eystein et al. (2022). Reconstructing natural variability of Atlantic Water inflow through the Holocene . (external link)
• Irvali, Nil; Galaasen, Eirik Vinje; Ninnemann, Ulysses S et al. (2022). Climate thresholds for south Greenland Ice Sheet demise: lessons from late Pleistocene interglacials . (external link)
• De Schepper, Stijn; Grant, Danielle; Steinsland, Kristine et al. (2022). Labrador Sea paleoceanography and paleodiversity across the Last Interglacial.. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Jansen, Eystein et al. (2021). Reconstructing natural variability of Atlantic Water inflow through the Holocene. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Galaasen, Eirik Vinje et al. (2019). East Greenland Ice Sheet variability and thresholds through late Pleistocene interglacials . (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Kessler, Augustin et al. (2019). Variability in ocean ventilation during recent interglacial periods. (external link)
• Ninnemann, Ulysses S; Galaasen, Eirik Vinje; Irvali, Nil et al. (2019). Variability in North Atlantic Deep Water Ventilation During Late Pleistocene Interglacials. (external link)
• Galaasen, Eirik Vinje; Irvali, Nil; Ninnemann, Ulysses S et al. (2018). North Atlantic Deep Water reductions a persistent feature of the last five interglacial periods. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Galaasen, Eirik Vinje et al. (2018). East Greenland Ice Sheet variability and thresholds through late Pleistocene interglacials . (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Kleiven, Helga Flesche et al. (2017). Resolving the phasing and forcing dynamics between North Atlantic climate and deep ocean circulation changes . (external link)
• Ninnemann, Ulysses S; Mjell, Tor Lien; Kleiven, Helga Flesche et al. (2016). Natural variability in Nordic Seas overflows: Toward a mechanistic understanding of proxy records. (external link)
• Kleiven, Helga Flesche; Irvali, Nil; Rosenthal, Yair et al. (2015). Multiproxy evidence for Climate and North Atlantic Deep Water variability spanning the last two millennia. (external link)
• Kleiven, Helga Flesche; Irvali, Nil; Rosenthal, Yair et al. (2015). Nordic Seas Overflows and Climate Variability Trough the Holocene. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2015). Deep Atlantic circulation during the last interglacial period. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Kleiven, Helga Flesche et al. (2015). Subpolar gyre changes from the penultimate glaciation to glacial inception and their relationship to Nordic Seas exchanges. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2014). Rapid reductions in North Atlantic Deep Water during the last interglacial period. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2014). North Atlantic Deep Water variability during the last two interglacial periods. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Galaasen, Eirik Vinje et al. (2013). Rapid switches in subpolar North Atlantic hydrography and climate during the Last Interglacial (MIS 5e). (external link)
• Ninnemann, Ulysses S; Galaasen, Eirik Vinje; Irvali, Nil et al. (2012). Rapid reductions in North Atlantic Deep Water during the last interglacial period and their relationship to Greenland Ice Sheet variability. (external link)
• Ninnemann, Ulysses S; Galaasen, Eirik Vinje; Irvali, Nil et al. (2012). Reductions in North Atlantic Deep Water in a warmer climate—lessons from the last interglacial. (external link)
• Ninnemann, Ulysses S; Kleiven, Helga Flesche; Mjell, Tor Lien et al. (2012). Nordic Seas overflows—the last two millennia. (external link)
• Ninnemann, Ulysses S; Galaasen, Eirik Vinje; Irvali, Nil et al. (2012). 8.2 kyr-like deep ocean circulation changes during the last interglacial. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Galaasen, Eirik Vinje et al. (2011). Abrupt changes in North Atlantic climate and hydrography and their relationship to Greenaldn ice sheet variability during the penultimate interglacial (MIS 5e). (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Galaasen, Eirik Vinje et al. (2011). Abrupt changes in North Atlantic climate and hydrography and their relationship to Greenland Ice Sheet variability during the penultimate interglacial (MIS 5e). (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2011). Rapid centennial scale reductions in North Atlantic Deep Water during the peak of the last interglacial period. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2011). Rapid centennial scale reductions in North Atlantic Deep Water during the peak of the last interglacial period. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2011). Rapid centennial scale reductions in North Atlantic Deep Water during the peak of the last interglacial period. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2011). Rapid centennial scale reductions in North Atlantic Deep Water during the peak of the last interglacial period. (external link)
• Risebrobakken, Bjørg; Andersson, Carin ; Born, Andreas et al. (2010). RG 1 Past warm climate. (external link)
• Irvali, Nil (2010). Abrupt Changes in North Atlantic Climate and Hydrography and Their Relationship to Deep Ocean Ventilation During the Penultimate Interglacial (MIS 5e). (external link)

Poster

• Irvali, Nil; Ninnemann, Ulysses S; Liltved, Allegra et al. (2023). Holocene natural variability in Atlantic Water inflow properties to the Arctic. (external link)
• Lefevere, Simon Pierre; Ninnemann, Ulysses S; Irvali, Nil et al. (2022). Abrupt deglacial variations in the properties and vigor of the Atlantic Water inflow to the Arctic. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Liltved, Allegra et al. (2022). Holocene natural variability in Atlantic Water inflow properties to the Arctic. (external link)
• Lefevere, Simon Pierre; Ninnemann, Ulysses S; Irvali, Nil et al. (2022). Natural variability in the Atlantic Water inflow to the Arctic during the last deglaciation. (external link)
• Pienkowski, Anna; Husum, Katrine; Furze, Mark F.A. et al. (2022). Revised marine reservoir offset (ΔR) values for molluscs and marine mammals for the archipelagos of Arctic North America and the Barents Sea. (external link)
• Lefevere, Simon Pierre; Ninnemann, Ulysses S; Irvali, Nil et al. (2021). Natural variability in the Atlantic Water inflow to the Arctic during the last deglaciation. (external link)
• Liltved, Allegra; Ninnemann, Ulysses S; Irvali, Nil (2021). Variability in Atlantic Water inflow into the Arctic Ocean since the deglaciation. (external link)
• Rohling, Eelco J.; Hibbert, Fiona D.; Grant, Katharine et al. (2019). Asynchronous Antarctic and Greenland ice-volume contributions to the last interglacial sea-level highstand. (external link)
• Irvali, Nil; Galaasen, Eirik Vinje; Ninnemann, Ulysses S et al. (2019). A low climate threshold for south Greenland Ice Sheet demise during the late Pleistocene. (external link)
• Rutledal, Sunniva; Ninnemann, Ulysses S; Kleiven, Helga Flesche et al. (2017). Assessing linkages between ice sheet calving, subpolar gyre density and deep water ventilation during the last glaciation . (external link)
• Hoem, Frida; Ninnemann, Ulysses S; Kleiven, Helga Flesche et al. (2017). Centennial-millennial scale variations in Western Antarctic Ice Sheet discharge and their relationship to climate and ocean changes during the late Holocene. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Kleiven, Helga Flesche et al. (2016). Resolving the phasing and forcing dynamics between North Atlantic climate and deep ocean circulation changes . (external link)
• Ninnemann, Ulysses S; Galaasen, Eirik Vinje; Kleiven, Helga Flesche et al. (2016). Thresholds for destabilizing thermohaline circulation and ocean carbon cycling in a warmer world (THRESHOLDS). (external link)
• Soltvedt, Natalie; Kleiven, Helga Flesche; Irvali, Nil et al. (2014). Ocean Drilling Program (ODP) Site 1233, SE Pacific Ocean: paleoclimatic reconstructions over Antarctic warming event 1. (external link)
• Irvali, Nil; Kleiven, Helga Flesche; Ninnemann, Ulysses S (2013). Multi-proxy evidence for changes in subpolar North Atlantic surface ocean hydrography and climate during the last interglacial. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2013). Interglacial deep ocean instability. (external link)
• Irvali, Nil; Kleiven, Helga Flesche; Ninnemann, Ulysses S (2012). New sedimentary constraints for changes in Iceland-Scotland Overflow Water linked to North Atlantic climate variability during the last interglacial period. (external link)
• Irvali, Nil; Kleiven, Helga Flesche; Ninnemann, Ulysses S (2012). New sedimentary constraints for changes in Iceland-Scotland Overflow Water linked to North Atlantic climate variability during the last interglacial period. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2012). Large centennial-scale North Atlantic Deep Water reductions during the peak of the last interglacial period. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2012). Rapid reductions in North Atlantic Deep Water during the last interglacial and their relationship to the Greenland ice sheet. (external link)
• Galaasen, Eirik Vinje; Ninnemann, Ulysses S; Irvali, Nil et al. (2012). Rapid reductions in North Atlantic Deep Water during the last interglacial and their relationship to the Greenland ice sheet. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Galaasen, Eirik Vinje et al. (2011). Abrupt changes in North Atlantic Climate and hydrography and their relationship to deep ocean ventilation during the penultimate interglacial (MIS 5e). (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Galaasen, Eirik Vinje et al. (2010). The relationship between North Atlantic Deep Water (NADW), climate, and the Greenland Ice Sheet during the Penultimate Interglacial (MIS 5e). (external link)
• Ninnemann, Ulysses S; Galaasen, Eirik Vinje; Irvali, Nil et al. (2010). Rapid Centennial Scale Reductions in North Atlantic Deep Water During the Peak of the Last Interglacial Period. (external link)
• Irvali, Nil; Ninnemann, Ulysses S; Galaasen, Eirik Vinje et al. (2009). The Relationship between North Atlantic Deep Water (NADW), climate and the Greenland Ice Sheet during the Penultimate Interglacial (MIS 5e). (external link)

Report

• Bova, Samantha C.; Rosenthal, Yair; Childress, Laurel B. et al. (2019). Expedition 379T Preliminary Report, Digging Deeper with the JR100: Extending high resolution paleoclimate records from the Chilean Margin to the Eemian. (external link)

Doctoral dissertation

• Irvali, Nil (2012). The relationship between climate, the Greenland Ice Sheet and Iceland-Scotland Overflow Water during the Penultimate Interglacial (MIS 5e). (external link)

See a complete overview of publications in Cristin.

Recent selected publications are listed below. For more information please see my Google Scholar profile, ResearchGate or CRIStin.

Irvalı, N., Ninnemann, U. S., Olsen, A., Rose, N. L., Thornalley, D. J. R., Mjell, T. L., and Counillon, F. 2024: Revising chronological uncertainties in marine archives using global anthropogenic signals: a case study on the oceanic 13C Suess effect. Geochronology, 6, 449–463. DOI: 10.5194/gchron-6-449-2024

Irvalı, N., Galaasen, E. V., Ninnemann, U. S., Rosenthal, Y., Born, A., and Kleiven, H. F. 2020: A low climate threshold for south Greenland Ice Sheet demise during the Late Pleistocene. Proceedings of the National Academy of Sciences, 117, 190-195. DOI:10.1073/pnas.1911902116

Galaasen, E. V., Ninnemann, U. S., Kessler, A., Irvalı, N., Rosenthal, Y., Tjiputra, J., Bouttes, N., Roche, D. M., Kleiven, H. F. and Hodell, D. A. 2020. Interglacial instability of North Atlantic Deep Water ventilation. Science, 367, 1485-1489. DOI:10.1126/science.aay6381

Rohling, E. J., Hibbert, F. D., Grant, K. M., Galaasen, E. V., Irvalı, N., Kleiven, H. F., Marino, G., Ninnemann, U., Roberts, A. P., Rosenthal, Y., Schulz, H., Williams, F. H. and Yu, J. 2019: Asynchronous Antarctic and Greenland ice-volume contributions to the last interglacial sea-level highstand. Nature Communications, 10,5040. DOI: 10.1038/s41467-019-12874-3

 

 

 

Current projects:

2023-2024 Fly Ash – Using global Anthropogenic signals to link modern observations and past reconstructions, University of Bergen L. Meltzers Høyskolefond Research Funds; Role: PI

2022-2025 Dynamics of the North Atlantic surface and overturning circulation (DYNASOR) (PI: Andreas Born, GEO) (SKD Strategic project); Role: WP leader

2022-2025 Proxy assimilation for reconstructing climate and improving model (PARCIM) (PI: Francois Counillon, NERSC) (SKD Strategic project); Role: Researcher

2018-2024 The Nansen Legacy (Arven etter Nansen, AeN) (PI: Marit Reigstad, UiT); Role: Researcher

 

Previous projects:

2016-2018 Thresholds for destabilizing thermohaline circulation and ocean carbon cycling in a warmer world (THRESHOLDS) (Research Council of Norway project; PI: Ulysses S. Ninnemann, GEO); Role: Researcher

2016 Resolving the phasing and forcing dynamics between North atlantic climate and deep circulation changes (CLIMADEEP), Bjerknes Centre for Climate Research Fast-Track Initiative Grant; Role: PI

2014-2016 Subpolar North Atlantic Climate States (SNACS) (Research Council of Norway project; PI: Are Olsen, GFI); Role: Researcher

2011-2014 North Atlantic Ocean-Climate Variability in a Warmer World (NOCWARM) (Research Council of Norway project; PI: Kikki Kleiven, GEO); Role: Researcher

2010-2014 EU-FP7 Past4Future; Role: Researcher in WP4.3 "Quantifying and modelling ocean circulation variability and impacts during warm climates"

2008-2012 Atlantic Meridional Overturning Circulation During Interglacials (AMOCINT) (European Science Foundation, EuroMARC Program; PI: Eystein Jansen, GEO); Role: Research fellow/PhD Candidate