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Dr Paul Halloran

Dr Paul Halloran

Associate Professor


 Laver Building 907


Laver Building, University of Exeter, North Park Road, Exeter, EX4 4QE, UK



Laver 907 (9th floor), Stretham Campus, University of Exeter, Exeter
Tel: +44 (0) 1392 725859‬
extension: 5859

My office hours will typically be Monday 11-12 online and Thursday 12.00-13.00 in person or online (up to you). Slots must be booked on Microsoft Teams using the link here. This booking page will create an event in your outlook calendar which will include an online link. The link can be used to meet on Microsoft Teams, or on Thursdays the timing of the slot used for an in-person meeting. Feel free to book consecutaive slots for longer meetings. 


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Journal articles

Haywood J, Jones A, Jones AC, Halloran P, Rasch P (In Press). Climate Intervention using marine cloud brightening (MCB) compared with stratospheric aerosol injection (SAI) in the UKESM1 climate model. Atmospheric Chemistry and Physics Abstract.
Halloran P (In Press). Climate change impacts on mesophotic regions of the Great Barrier Reef. Proceedings of the National Academy of Sciences Abstract.
Manville G, Bell TG, Mulcahy JP, Simo R, Gali M, Mahajan AS, Hulswar S, Halloran PR (2023). Global analysis of the controls on seawater dimethylsulfide spatial variability. BIOGEOSCIENCES, 20(9), 1813-1828.  Author URL.
McWhorter JK, Halloran PR, Roff G, Skirving WJ, Mumby PJ (2022). Climate refugia on the Great Barrier Reef fail when global warming exceeds 3°C. Glob Chang Biol, 28(19), 5768-5780. Abstract.  Author URL.
Arellano-Nava B, Halloran PR, Boulton CA, Scourse J, Butler PG, Reynolds DJ, Lenton TM (2022). Destabilisation of the Subpolar North Atlantic prior to the Little Ice Age. Nature Communications, 13(1). Abstract.
Hulswar S, Simo R, Gali M, Bell TG, Lana A, Inamdar S, Halloran PR, Manville G, Mahajan AS (2022). Third revision of the global surface seawater dimethyl sulfide climatology (DMS-Rev3). EARTH SYSTEM SCIENCE DATA, 14(7), 2963-2987.  Author URL.
Arellano Nava B, Halloran PR, Boulton CA, Lenton TM (2021). Bivalves indicate that the North Atlantic was under stress before the onset of the Little Ice Age. Abstract.
Halloran PR, McWhorter JK, Arellano Nava B, Marsh R, Skirving W (2021). S2P3-R v2.0: computationally efficient modelling of shelf seas on regional to global scales. Geoscientific Model Development, 14(10), 6177-6195. Abstract.
McWhorter JK, Halloran PR, Roff G, Skirving WJ, Perry CT, Mumby PJ (2021). The importance of 1.5°C warming for the Great Barrier Reef. Global Change Biology, 28(4), 1332-1341. Abstract.
Hulswar S, Manville G, Simo R, Gali M, Bell TG, Halloran P, Lana A, Mahajan AS (2021). Third Revision of the Bottom-up Global Surface Seawater Dimethyl Sulphide Climatology (DMS-Rev3).
Manville G, Halloran P, Bell T, Mulcahy J, Mahajan A, Hulswar S, Simo R, Gali M (2021). What can we learn about small-scale spatial variability of surface ocean dimethylsulfide (DMS) concentrations from high frequency novel measurements?.
Langley B, Halloran PR, Power A, Rickaby REM, Chana P, Diver P, Thornalley D, Hacker C, Love J (2020). A new method for isolating and analysing coccospheres within sediment. Scientific Reports, 10(1). Abstract.
Halloran PR, Hall IR, Menary M, Reynolds DJ, Scourse JD, Screen JA, Bozzo A, Dunstone N, Phipps S, Schurer AP, et al (2020). Natural drivers of multidecadal Arctic sea ice variability over the last millennium. Scientific Reports, 10(1). Abstract.
Lebehot AD, Halloran PR, Watson AJ, McNeall D, Ford DA, Landschützer P, Lauvset SK, Schuster U (2019). Reconciling Observation and Model Trends in North Atlantic Surface CO<sub>2</sub>. Global Biogeochemical Cycles, 33(10), 1204-1222. Abstract.
Reynolds DJ, Hal IR, Slater SM, Mette MJ, Wanamaker AD, Scourse JD, Garry FK, Halloran PR (2018). Isolating and Reconstructing Key Components of North Atlantic ocean Variability from a Sclerochronological Spatial Network. PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY, 33(10), 1086-1098.  Author URL.
Reynolds DJ, Hall IR, Slater SM, Scourse JD, Halloran PR, Sayer MDJ (2017). Reconstructing Past Seasonal to Multicentennial‐Scale Variability in the NE Atlantic Ocean Using the Long‐Lived Marine Bivalve Mollusk <scp><i>Glycymeris glycymeris</i></scp>. Paleoceanography, 32(11), 1153-1173. Abstract.
Reynolds DJ, Scourse JD, Halloran PR, Nederbragt AJ, Wanamaker AD, Butler PG, Richardson CA, Heinemeier J, Eiríksson J, Knudsen KL, et al (2016). Annually resolved North Atlantic marine climate over the last millennium. Nature Communications, 7 Abstract.
Séférian R, Gehlen M, Bopp L, Resplandy L, Orr JC, Marti O, Dunne JP, Christian JR, Doney SC, Ilyina T, et al (2016). Inconsistent strategies to spin up models in CMIP5: Implications for ocean biogeochemical model performance assessment. Geoscientific Model Development, 9(5), 1827-1851. Abstract.
Couldrey MP, Oliver KIC, Yool A, Halloran PR, Achterberg EP (2016). On which timescales do gas transfer velocities control North Atlantic CO<inf>2</inf> flux variability?. Global Biogeochemical Cycles, 30(5), 787-802. Abstract.
Halloran P, Cox P (2015). Coral bleaching under unconventional scenarios of climate warming and ocean acidification. Nature Climate Change
Halloran PR, Booth BBB, Jones CD, Lambert FH, McNeall DJ, Totterdell IJ, Völker C (2015). The mechanisms of North Atlantic CO<inf>2</inf> uptake in a large Earth System Model ensemble. Biogeosciences, 12(14), 4497-4508. Abstract.
Kwiatkowski L, Yool A, Allen JI, Anderson TR, Barciela R, Buitenhuis ET, Butenschön M, Enright C, Halloran PR, Le Quéré C, et al (2014). IMarNet: an ocean biogeochemistry model intercomparison project within a common physical ocean modelling framework. Biogeosciences, 11(24), 7291-7304. Abstract.
Williams JHT, Totterdell IJ, Halloran PR, Valdes PJ (2014). Numerical simulations of oceanic oxygen cycling in the FAMOUS Earth-System model: FAMOUS-ES, version 1.0. Geoscientific Model Development, 7(4), 1419-1431. Abstract.
Mumby PJ, Wolff NH, Bozec YM, Chollett I, Halloran P (2014). Operationalizing the resilience of coral reefs in an era of climate change. Conservation Letters, 7(3), 176-187. Abstract.
Kwiatkowski L, Halloran PR, Mumby PJ, Stephenson DB (2014). What spatial scales are believable for climate model projections of sea surface temperature?. Climate Dynamics, 43(5-6), 1483-1496. Abstract.
Kennedy EV, Perry CT, Halloran PR, Iglesias-Prieto R, Schönberg CHL, Wisshak M, Form AU, Carricart-Ganivet JP, Fine M, Eakin CM, et al (2013). Avoiding coral reef functional collapse requires local and global action. Curr Biol, 23(10), 912-918. Abstract.  Author URL.
Mora C, Wei CL, Rollo A, Amaro T, Baco AR, Billett D, Bopp L, Chen Q, Collier M, Danovaro R, et al (2013). Biotic and Human Vulnerability to Projected Changes in Ocean Biogeochemistry over the 21st Century. PLoS Biology, 11(10). Abstract.
Joos F, Roth R, Fuglestvedt JS, Peters GP, Enting IG, von Bloh W, Brovkin V, Burke EJ, Eby M, Edwards NR, et al (2013). Carbon dioxide and climate impulse response functions for the computation of greenhouse gas metrics: a multi-model analysis. ATMOSPHERIC CHEMISTRY AND PHYSICS, 13(5), 2793-2825.  Author URL.
Kwiatkowski L, Economou T, Cox PM, Halloran PR, Mumby PJ, Booth BBB, Carilli J, Guzman HM (2013). Caribbean coral growth influenced by anthropogenic aerosol emissions. Nature Geoscience
Andrews OD, Bindoff NL, Halloran PR, Ilyina T, Le Quere C (2013). Detecting an external influence on recent changes in oceanic oxygen using an optimal fingerprinting method. BIOGEOSCIENCES, 10(3), 1799-1813.  Author URL.
Vancoppenolle M, Bopp L, Madec G, Dunne J, Ilyina T, Halloran PR, Steiner N (2013). Future arctic ocean primary productivity from CMIP5 simulations: Uncertain outcome, but consistent mechanisms. Global Biogeochemical Cycles, 27(3), 605-619. Abstract.
Menary MB, Roberts CD, Palmer MD, Halloran PR, Jackson L, Wood RA, Müller WA, Matei D, Lee SK (2013). Mechanisms of aerosol-forced AMOC variability in a state of the art climate model. Journal of Geophysical Research: Oceans, 118(4), 2087-2096. Abstract.
Bopp L, Resplandy L, Orr JC, Doney SC, Dunne JP, Gehlen M, Halloran P, Heinze C, Ilyina T, Séférian R, et al (2013). Multiple stressors of ocean ecosystems in the 21st century: Projections with CMIP5 models. Biogeosciences, 10(10), 6225-6245. Abstract.
Booth BBB, Dunstone NJ, Halloran PR, Andrews T, Bellouin N (2012). Aerosols implicated as a prime driver of twentieth-century North Atlantic climate variability (vol 484, pg 228, 2012). NATURE, 485(7399), 534-534.  Author URL.
Booth BBB, Dunstone NJ, Halloran PR, Andrews T, Bellouin N (2012). Aerosols implicated as a prime driver of twentieth-century North Atlantic climate variability. Nature, 484(7393), 228-232. Abstract.  Author URL.
Halloran PR (2012). Does atmospheric CO<inf>2</inf> seasonality play an important role in governing the air-sea flux of CO<inf>2</inf>?. Biogeosciences, 9(6), 2311-2323. Abstract.
Boucher O, Halloran PR, Burke EJ, Doutriaux-Boucher M, Jones CD, Lowe J, Ringer MA, Robertson E, Wu P (2012). Reversibility in an Earth System model in response to CO<inf>2</inf> concentration changes. Environmental Research Letters, 7(2). Abstract.
Good P, Caesar J, Bernie D, Lowe JA, van der Linden P, Gosling SN, Warren R, Arnell NW, Smith S, Bamber J, et al (2011). A review of recent developments in climate change science. Part I: Understanding of future change in the large-scale climate system. PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT, 35(3), 281-296.  Author URL.
McNeall D, Halloran PR, Good P, Betts RA (2011). Analyzing abrupt and nonlinear climate changes and their impacts. WILEY INTERDISCIPLINARY REVIEWS-CLIMATE CHANGE, 2(5), 663-686.  Author URL.
Collins WJ, Bellouin N, Doutriaux-Boucher M, Gedney N, Halloran P, Hinton T, Hughes J, Jones CD, Joshi M, Liddicoat S, et al (2011). Development and evaluation of an Earth-System model-HadGEM2. GEOSCIENTIFIC MODEL DEVELOPMENT, 4(4), 1051-1075.  Author URL.
Kulmala M, Asmi A, Lappalainen HK, Baltensperger U, Brenguier JL, Facchini MC, Hansson HC, Hov, O'Dowd CD, Pöschl U, et al (2011). General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI)-integrating aerosol research from nano to global scales. Atmospheric Chemistry and Physics, 11(24), 13061-130143. Abstract.
Martin GM, Bellouin N, Collins WJ, Culverwell ID, Halloran PR, Hardiman SC, Hinton TJ, Jones CD, McDonald RE, McLaren AJ, et al (2011). The HadGEM2 family of Met Office Unified Model climate configurations. GEOSCIENTIFIC MODEL DEVELOPMENT, 4(3), 723-757.  Author URL.
Jones CD, Hughes JK, Bellouin N, Hardiman SC, Jones GS, Knight J, Liddicoat S, O'Connor FM, Andres RJ, Bell C, et al (2011). The HadGEM2-ES implementation of CMIP5 centennial simulations. GEOSCIENTIFIC MODEL DEVELOPMENT, 4(3), 543-570.  Author URL.
Tripati AK, Eagle RA, Thiagarajan N, Gagnon AC, Bauch H, Halloran PR, Eiler JM (2010). <SUP>13</SUP>C-<SUP>18</SUP>O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths. GEOCHIMICA ET COSMOCHIMICA ACTA, 74(20), 5697-5717.  Author URL.
Tripati AK, Eagle RA, Thiagarajan N, Gagnon AC, Bauch H, Halloran PR, Eiler JM (2010). <sup>13</sup>C-<sup>18</sup>O isotope signatures and 'clumped isotope' thermometry in foraminifera and coccoliths. Geochimica et Cosmochimica Acta, 74(20), 5697-5717. Abstract.
Halloran PR, Bell TG, Totterdell IJ (2010). Can we trust empirical marine DMS parameterisations within projections of future climate?. Biogeosciences, 7(5), 1645-1656. Abstract.
Woodhouse MT, Carslaw KS, Mann GW, Vallina SM, Vogt M, Halloran PR, Boucher O (2010). Low sensitivity of cloud condensation nuclei to changes in the sea-air flux of dimethyl-sulphide. ATMOSPHERIC CHEMISTRY AND PHYSICS, 10(16), 7545-7559.  Author URL.
Halloran PR, Rust N, Rickaby REM (2009). Isolating coccoliths from sediment for geochemical analysis. Geochemistry, Geophysics, Geosystems, 10(3). Abstract.
Halloran PR, Hall IR, Colmenero-Hidalgo E, M. Rickaby RE (2008). Evidence for a multi-species coccolith volume change over the past two centuries: Understanding a potential ocean acidification response. Biogeosciences, 5(6), 1651-1655. Abstract.
Iglesias-Rodriguez MD, Halloran PR, Rickaby REM, Hall IR, Colmenero-Hidalgo E, Gittins JR, Green DRH, Tyrrell T, Gibbs SJ, Von Dassow P, et al (2008). Phytoplankton calcification in a high-CO<inf>2</inf> world. Science, 320(5874), 336-340. Abstract.
Iglesias-Rodriguez MD, Buitenhuis ET, Raven JA, Schofield O, Poulton AJ, Gibbs S, Halloran PR, De Baar HJW (2008). Response to comment on "Phytoplankton calcification in a high-CO <inf>2</inf> world". Science, 322(5907). Abstract.
Rickaby REM, Halloran P (2005). Cool La Niña during the warmth of the Pliocene?. Science, 307(5717), 1948-1952. Abstract.  Author URL.


Hermoso A, Minoletti F, Rickaby REM, Halloran P (2008). Determination of differential vital effects for some Neogene calcareous nannoplankton taxa.  Author URL.
Rickaby REM, Hendry K, Young J, Halloran P (2008). Perturbing phytoplankton: a polar view on anthropogenic change.  Author URL.
Halloran P, Rickaby REM (2006). Separating the coccoliths from the clays and unlocking new trace metal proxies.  Author URL.

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External Engagement and Impact

Awards/Honorary fellowships

2012 Lloyds of London Science of Risk runners up for Booth et al., Aerosols implicated as a prime driver of twentieth-century North Atlantic climate variability. NATURE, 2012

Committee/panel activities

Member of the NERC UK Ocean Acidification program Project Advisory Group (2010-present)

Member of NERC Peer Review College

Visiting Scientist at the Met Office Hadley Centre

Invited lectures & workshops

2012: Cardiff University: Keynote at ’Thinking outside the climate envelope: Interdisciplinary applications of climate science’

2011: Plymouth University: Ocean carbon uptake: from seasonal to multi-millennial variability

2009: Yale University: Ocean Science of Risk Prize Acidification and the Carbonate Pump

Media Coverage

Kennedy et al., 2013:,

Kwiatkowski et al., 2013: BBC News, Telegraph,, Planet Earth

Booth et al, 2012: Financial Times

Iglesias-Rodriguez and Halloran et al. 2008: Washington Post, Guardian, BBC

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Undergraduate Modules:

  • GEO3231: The Ocean and Climate (convenor)
  • GEO1212: Earth System Science: The Future of Our Planet (convenor)
  • GEO2330: Research Methods for Physical Geography: Scientific Computing (convenor of computing component)
  • GEO2309: Physical Geography Practice. Research skills.
  • GEO1207: Earth Systems
  • GEO1210: Investigating Physical Geography: Slapton field trip
  • GEO1308: Jurassic Coast Field Trip


  • GEOM410:Key Themes in Climate Change Impacts and Feedbacks



Information not currently available

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Supervision / Group

Postdoctoral researchers

  • Freya Garry

Postgraduate researchers


  • Lester Kwiatkowski (Primary supervisor Peter Cox)
  • Alice Lebehot

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