Our key outputs
Temperature effect on seawater ƒCO2 revisited: theoretical basis, uncertainty analysis and implications for parameterising carbonic acid equilibrium constants
Humphreys, M. P. (2024). Ocean Science 20, 1325-1350.
doi:10.5194/os-20-1325-2024 Download pdf »
The Changing Biological Carbon Pump of the South Atlantic Ocean
Delaigue, L., Sulpis, O., Reichart, G.-J. and Humphreys, M. P. (2024). Global Biogeochemical Cycles 38(9), e2024GB008202.
doi:10.1029/2024GB008202 Download pdf »
Synthesis of in situ marine calcium carbonate dissolution kinetic measurements in the water column
Cala, B., Sulpis, O., Wolthers, M. and Humphreys, M. P. (2024). Global Biogeochemical Cycles 38(9), e2023GB008009.
doi:10.1029/2023GB008009 Download pdf »
Dissolution of a submarine carbonate platform by a submerged lake of acidic seawater
Humphreys, M. P., Meesters, E. H., de Haas, H., Karancz, S., Delaigue, L., Bakker, K., Duineveld, G., de Goeyse, S., Haas, A., Mienis, F., Ossebaar, S. and van Duyl, F. C. (2022). Biogeosciences 19, 347-358.
doi:10.5194/bg-19-347-2022 Download pdf »
PyCO2SYS v1.8: marine carbonate system calculations in Python
Humphreys, M. P., Lewis, E. R., Sharp, J. D. and Pierrot, D. (2022). Geoscientific Model Development 15, 15-43.
doi:10.5194/gmd-15-15-2022 Download pdf »
Mechanisms for a nutrient-conserving carbon pump in a seasonally stratified, temperate continental shelf sea
Humphreys, M. P., Achterberg, E. P., Hopkins, J. E., Chowdhury, M. Z. H., Griffiths, A. M., Hartman, S. E., Hull, T., Smilenova, A., Wihsgott, J., Woodward, E. M. S. and Moore, C. M. (2019). Progress in Oceanography 177, 101961.
doi:10.1016/j.pocean.2018.05.001 Download pdf »
Modelling seawater carbonate chemistry in shellfish aquaculture regions: Insights into CO2 release associated with shell formation and growth
Morris, J. P. and Humphreys, M. P. (2019). Aquaculture 501, 338-344.
doi:10.1016/j.aquaculture.2018.11.028 Download pdf »
On the influence of marine biogeochemical processes over CO2 exchange between the atmosphere and ocean
Humphreys, M. P., Daniels, C. J., Wolf-Gladrow, D. A., Tyrrell, T. and Achterberg, E. P. (2018). Marine Chemistry 199, 1-11.
doi:10.1016/j.marchem.2017.12.006 Download pdf »
Climate sensitivity and the rate of ocean acidification: future impacts, and implications for experimental design
Humphreys, M. P. (2017). ICES Journal of Marine Science 74(4), 934-940.
doi:10.1093/icesjms/fsw189 Download pdf »
Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean
Humphreys, M. P., Griffiths, A. M., Achterberg, E. P., Holliday, N. P., Rérolle, V. M. C., Menzel Barraqueta, J.-L., Couldrey, M. P., Oliver, K. I. C., Hartman, S. E., Esposito, M. and Boyce, A. J. (2016). Global Biogeochemical Cycles 30(2), 293-310.
doi:10.1002/2015GB005246 Download pdf »Collaborations, earlier work and in review
From small scale variability to mesoscale stability in surface ocean pH: implications for air-sea CO2 equilibration
Delaigue, L., Reichart, G.-J., Galley, C., Ourradi, Y. and Humphreys, M. P. (2024, in review). EGUsphere [preprint].
doi:10.5194/egusphere-2024-2853 Download pdf »The annual update GLODAPv2.2023: the global interior ocean biogeochemical data product
Lauvset, S. K., Lange, N., Tanhua, T., Bittig, H. C., Olsen, A., Kozyr, A., Álvarez, M., Azetsu-Scott, K., Brown, P. J., Carter, B. R., Cotrim da Cunha, L., Hoppema, M., Humphreys, M. P., Ishii, M., Jeansson, E., Murata, A., Müller, J. D., Perez, F. F., Schirnick, C., Steinfeldt, R., Suzuki, T., Ulfsbo, A., Velo, A., Woosley, R. J. and Key, R. (2024). Earth System Science Data 16, 2047-2072.
doi:10.5194/essd-16-2047-2024 Download pdf »Laboratory Observation of the Buffering Effect of Aragonite Dissolution at the Seafloor
van de Mortel, H., Delaigue, L., Humphreys, M. P., Middelburg, J. J., Ossebaar, S., Bakker, K., Trabucho Alexandre, J. P., van Leeuwen-Tolboom, A. W. E., Wolthers, M. and Sulpis, O. (2024). Journal of Geophysical Research: Biogeosciences 129, e2023JG007581.
doi:10.1029/2023JG007581 Download pdf »Proton Binding Characteristics of Dissolved Organic Matter Extracted from the North Atlantic
Lodeiro, P., Rey-Castro, C., David, C., Humphreys, M. P. and Gledhill, M. (2023). Environmental Science & Technology 57, 21136-21144.
doi:10.1021/acs.est.3c01810 Download pdf »GLODAPv2.2022: the latest version of the global interior ocean biogeochemical data product
Lauvset, S. K., Lange, N., Tanhua, T., Bittig, H. C., Olsen, A., Kozyr, A., Alin, S. R., Álvarez, M., Azetsu-Scott, K., Barbero, L., Becker, S., Brown, P. J., Carter, B. R., da Cunha, L. C., Feely, R. A., Hoppema, M., Humphreys, M. P., Ishii, M., Jeansson, E., Jiang, L.-Q., Jones, S. D., Lo Monaco, C., Murata, A., Müller, J. D., Pérez, F. F., Pfeil, B., Schirnick, C., Steinfeldt, R., Suzuki, T., Tilbrook, B., Ulfsbo, A., Velo, A., Woosley, R. J. and Key, R. M. (2022). Earth System Science Data 14, 5543-5572.
doi:10.5194/essd-14-5543-2022 Download pdf »Seasonal water mass evolution and non-Redfield dynamics enhance CO2 uptake in the Chukchi Sea
Ouyang, Z., Collins, A., Li, Y., Qi, D., Arrigo, K. R., Zhuang, Y., Nishino, S., Humphreys, M. P., Kosugi, N., Murata, A., Kirchman, D. L., Chen, L., Chen, J. and Cai, W.-J. (2022). Journal of Geophysical Research: Oceans 127, e2021JC018326.
doi:10.1029/2021JC018326 Download pdf »Enhanced mercury reduction in the South Atlantic Ocean during carbon remineralization
Živković, I., Humphreys, M. P., Achterberg, E. P., Dumousseaud, C., Woodward, E. M. S., Bojanić, N., Šolić, M., Bratkič, A., Kotnik, J., Vahčič, M., Obu Vazner, K., Begu, E., Fajon, V., Shlyapnikov, Y. and Horvat, M. (2022). Marine Pollution Bulletin 178, 113644.
doi:10.1016/j.marpolbul.2022.113644 Download pdf »Chemical speciation models based upon the Pitzer activity coefficient equations, including the propagation of uncertainties. II. Tris buffers in artificial seawater at 25 °C, and an assessment of the seawater 'Total' pH scale
Clegg, S. L., Humphreys, M. P., Waters, J. F., Turner, D. R. and Dickson, A. G. (2022). Marine Chemistry 244, 104096.
doi:10.1016/j.marchem.2022.104096 Download pdf »Chemical speciation models based upon the Pitzer activity coefficient equations, including the propagation of uncertainties. I. Artificial seawater from 0 to 45 °C
Humphreys, M. P., Waters, J. F., Turner, D. R., Dickson, A. G. and Clegg, S. L. (2022). Marine Chemistry 244, 104095.
doi:10.1016/j.marchem.2022.104095 Download pdf »RADIv1: a non-steady-state early diagenetic model for ocean sediments in Julia and MATLAB/GNU Octave
Sulpis, O., Humphreys, M. P., Wilhelmus, M., Carroll, D., Berelson, W., Menemenlis, D., Middelburg, J. and Adkins, J. (2022). Geoscientific Model Development 15(5), 2105-2131.
doi:10.5194/gmd-15-2105-2022 Download pdf »Best Practice Data Standards for Discrete Chemical Oceanographic Observations
Jiang, L.-Q., Pierrot, D., Wanninkhof, R., Feely, R. A., Tilbrook, B., Alin, S., Barbero, L., Byrne, R. H., Carter, B. R., Dickson, A. G., Gattuso, J.-P., Greeley, D., Hoppema, M., Humphreys, M. P., Karstensen, J., Lange, N., Lauvset, S. K., Lewis, E. R., Olsen, A., Pérez, F. F., Sabine, C., Sharp, J. D., Tanhua, T., Trull, T. W., Velo, A., Allegra, A. J., Barker, P., Burger, E., Cai, W.-J., Chen, C.-T. A., Cross, J., Garcia, H., Hernandez-Ayon, J. M., Hu, X., Kozyr, A., Langdon, C., Lee, K., Salisbury, J., Wang, Z. A. and Xue, L (2022). Frontiers in Marine Science 8, 705638.
doi:10.3389/fmars.2021.705638 Download pdf »Equilibrium calculations of iron speciation and apparent iron solubility in the Celtic Sea at ambient seawater pH using the NICA-Donnan model
Zhu, K., Birchill, A. J., Milne, A., Ussher, S., Humphreys, M. P., Carr, N., Mahaffey, C., Lohan, M. C., Achterberg, E. P. and Gledhill, M. (2021). Marine Chemistry 237, 104038.
doi:10.1016/j.marchem.2021.104038Air-Sea Gas Fluxes and Remineralization From a Novel Combination of pH and O2 Sensors on a Glider
Possenti, L., Humphreys, M. P., Bakker, D. C. E., Cobas-García, M., Fernand, L., Lee, G. A., Pallottino, F., Loucaides, S., Mowlem, M. C. and Kaiser, J. (2021). Frontiers in Marine Science 8, 696772.
doi:10.3389/fmars.2021.696772 Download pdf »Norwegian Sea net community production estimated from O2 and prototype CO2 optode measurements on a Seaglider
Possenti, L., Skjelvan, I., Atamanchuk, D., Tengberg, A., Humphreys, M. P., Loucaides, S., Fernand, L. and Kaiser, J. (2021). Ocean Science 17, 593-614.
doi:10.5194/os-17-593-2021 Download pdf »Short-term responses to ocean acidification: effects on relative abundance of eukaryotic plankton from the tropical Timor Sea
Rahlff, J., Khodami, S., Voskuhl, L., Humphreys, M. P., Stolle, C., Martinez Arbizu, P., Wurl, O. and Ribas-Ribas, M. (2021). Marine Ecology Progress Series 658, 59-74.
doi:10.3354/meps13561Air-sea CO2 exchange and ocean acidification in UK seas and adjacent waters
Humphreys, M. P., Artioli, Y., Bakker, D. C. E., Hartman, S. E., León, P., Wakelin, S., Walsham, P. and Williamson, P. (2020). MCCIP Science Review 2020, 54-75.
doi:10.14465/2020.arc03.oac Download pdf »The pH dependency of the boron isotopic composition of diatom opal (Thalassiosira weissflogii)
Donald, H. K., Foster, G. L., Fröhberg, N., Swann, G. E. A., Poulton, A., Moore, C. M. and Humphreys, M. P. (2020). Biogeosciences 17, 2825-2837.
doi:10.5194/bg-17-2825-2020 Download pdf »Seasonality and spatial heterogeneity of the surface ocean carbonate system in the northwest European continental shelf
Hartman, S. E., Humphreys, M. P., Kivimäe, C., Woodward, E. M. S., Kitidis, V., McGrath, T., Hydes, D. J., Greenwood, N., Hull, T., Ostle, C., Pearce, D. J., Sivyer, D., Stewart, B. M., Walsham, P., Painter, S. C., McGovern, E., Harris, C., Griffiths, A., Smilenova, A., Clarke, J., Davis, C., Sanders, R. and Nightingale, P. (2019). Progress in Oceanography 177, 101909.
doi:10.1016/j.pocean.2018.02.005 Download pdf »Winter weather controls net influx of atmospheric CO2 on the north-west European shelf
Kitidis, V., Shutler, J. D., Ashton, I., Warren, M., Brown, I., Findlay, H., Hartman, S. E., Sanders, R., Humphreys, M., Kivimäe, C., Greenwood, N., Hull, T., Pearce, D., McGrath, T., Stewart, B. M., Walsham, P., McGovern, E., Bozec, Y., Gac, J.-P., van Heuven, S. M. A. C., Hoppema, M., Schuster, U., Johannessen, T., Omar, A., Lauvset, S. K., Skjelvan, I., Olsen, A., Steinhoff, T., Körtzinger, A., Becker, M., Lefevre, N., Diverrès, D., Gkritzalis, T., Cattrijsse, A., Petersen, W., Voynova, Y.G., Chapron, B., Grouazel, A., Land, P. E., Sharples, J. and Nightingale, P. D. (2019). Scientific Reports 9, 20153.
doi:10.1038/s41598-019-56363-5 Download pdf »Impact of Nonzero Intercept Gas Transfer Velocity Parameterizations on Global and Regional Ocean–Atmosphere CO2 Fluxes
Ribas-Ribas, M., Battaglia, G., Humphreys, M. P. and Wurl, O. (2019). Geosciences 9(5), 230.
doi:10.3390/geosciences9050230 Download pdf »Isotopic fractionation of carbon during uptake by phytoplankton across the South Atlantic subtropical convergence
Tuerena, R. E., Ganeshram, R. S., Humphreys, M. P., Browning, T. J., Bouman, H. and Piotrowski, A. P. (2019). Biogeosciences 16, 3621-3635.
doi:10.5194/bg-16-3621-2019 Download pdf »What drives the latitudinal gradient in open ocean surface dissolved inorganic carbon concentration?
Wu, Y., Hain, M. P., Humphreys, M. P., Hartman, S. and Tyrrell, T. (2019). Biogeosciences 16, 2661-2681.
doi:10.5194/bg-16-2661-2019 Download pdf »Controls on open-ocean North Atlantic ΔpCO2 at seasonal and interannual timescales are different
Henson, S. A., Humphreys, M. P., Land, P., Shutler, J., Goddijn-Murphy, L., Warren, M. and Schuster, U. (2018). Geophysical Research Letters 45.
doi:10.1029/2018GL078797 Download pdf »Geographical CO2 sensitivity of phytoplankton correlates with ocean buffer capacity
Richier, S., Achterberg, E. P., Humphreys, M. P., Poulton, A. J., Suggett, D. J., Tyrrell, T. and Moore, C. M. (2018). Global Change Biology 24, 4438-4452.
doi:10.1111/gcb.14324 Download pdf »The GEOTRACES Intermediate Data Product 2017
Schlitzer, R. et al. [286 authors incl. Humphreys, M. P.] (2018). Chemical Geology 493, 210-223.
doi:10.1016/j.chemgeo.2018.05.040 Download pdf »Biological Pump
Giering, S. L. and Humphreys, M. P. (2017). Encylopedia of Geochemistry, ed. White, W. M., Springer, 1-6.
doi:10.1007/978-3-319-39193-9_154-1 Download pdf »Characterization of a Time-Domain Dual Lifetime Referencing pCO2 Optode and Deployment as a High-Resolution Underway Sensor across the High Latitude North Atlantic Ocean
Clarke, J. S., Humphreys, M. P., Tynan, E., Kitidis, V., Brown, I., Mowlem, M. C. and Achterberg, E. P. (2017). Frontiers in Marine Science 4(396).
doi:10.3389/fmars.2017.00396 Download pdf »A multi-decade record of high-quality fCO2 data in version 3 of the Surface Ocean CO2 Atlas (SOCAT)
Bakker, D. C. E. et al. [92 authors incl. Humphreys, M. P.] (2016). Earth System Science Data 8, 383-413.
doi:10.5194/essd-8-383-2016 Download pdf »An internally consistent dataset of δ13C-DIC in the North Atlantic Ocean – NAC13v1
Becker, M., Andersen, N., Erlenkeuser, H., Humphreys, M. P., Tanhua, T. and Körtzinger, A. (2016). Earth System Science Data 8, 559-570.
doi:10.5194/essd-8-559-2016 Download pdf »Species-specific calcite production reveals Coccolithus pelagicus as the key calcifier in the Arctic Ocean
Daniels, C. J., Poulton, A. J., Young, J. R., Esposito, M., Humphreys, M. P., Ribas Ribas, M., Tynan, E. and Tyrrell, T. (2016). Marine Ecology Progress Series 555, 29-47.
doi:10.3354/meps11820 Download pdf »Carbon dioxide and ocean acidification observations in UK waters: Synthesis report with a focus on 2010–2015
Ostle, C., Williamson, P., Artoli, Y., Bakker, D. C. E., Birchenough, S., Davis, C. E., Dye, S., Edwards, M., Findlay, H. S., Greenwood, N., Hartman, S., Humphreys, M. P., Jickells, T., Johnson, M., Landschützer, P., Parker, R., Pearce, D., Pinnegar, J., Robinson, C., Schuster, U., Silburn, B., Thomas, R., Wakelin, S., Walsham, P. and Watson, A. J. (2016). Department for Environment, Food and Rural Affairs, pp. 44.
doi:10.13140/RG.2.1.4819.4164 Download pdf »Stable carbon isotopes of dissolved inorganic carbon for a zonal transect across the subpolar North Atlantic Ocean in summer 2014
Humphreys, M. P., Greatrix, F. M., Tynan, E., Achterberg, E. P., Griffiths, A. M., Fry, C. H., Garley, R., McDonald, A. and Boyce, A. J. (2016). Earth System Science Data 8, 221-233.
doi:10.5194/essd-8-221-2016 Download pdf »Production of dissolved organic carbon by Arctic plankton communities: Responses to elevated carbon dioxide and the availability of light and nutrients
Poulton, A. J., Daniels, C. J., Esposito, M., Humphreys, M. P., Mitchell, E., Ribas-Ribas, M., Russell, B. C., Stinchcombe, M. C., Tynan, E. and Richier, S. (2016). Deep-Sea Research Part II 127, 60-74.
doi:10.1016/j.dsr2.2016.01.002 Download pdf »Physical and biogeochemical controls on the variability in surface pH and calcium carbonate saturation states in the Atlantic sectors of the Arctic and Southern Oceans
Tynan, E., Clarke, J. S., Humphreys, M. P., Ribas-Ribas, M., Esposito, M., Rérolle, V. M. C., Schlosser, C., Thorpe, S. E., Tyrrell, T. and Achterberg, E. P. (2016). Deep-Sea Research Part II 127, 7-27.
doi:10.1016/j.dsr2.2016.01.001 Download pdf »Measurements of the stable carbon isotope composition of dissolved inorganic carbon in the northeastern Atlantic and Nordic Seas during summer 2012
Humphreys, M. P., Achterberg, E. P., Griffiths, A. M., McDonald, A. and Boyce, A. J. (2015). Earth System Science Data 7, 127-135.
doi:10.5194/essd-7-127-2015 Download pdf »