Photo of Prof Claire Mahaffey

Prof Claire Mahaffey BSc, PhD

Professor of Ocean Sciences Earth, Ocean and Ecological Sciences

    Publications

    2020

    Co-occurrence of Fe and P stress in natural populations of the marine diazotroph Trichodesmium (Journal article)

    Held, N. A., Webb, E. A., McIlvin, M. M., Hutchins, D. A., Cohen, N. R., Moran, D. M., . . . Saito, M. A. (2020). Co-occurrence of Fe and P stress in natural populations of the marine diazotroph Trichodesmium. Biogeosciences, 17(9), 2537-2551. doi:10.5194/bg-17-2537-2020

    DOI: 10.5194/bg-17-2537-2020

    Water mass analysis along 22 °N in the subtropical North Atlantic for the JC150 cruise (GEOTRACES, GApr08) (Journal article)

    Artigue, L., Lacan, F., van Gennip, S., Lohan, M. C., Wyatt, N. J., Woodward, E. M. S., . . . Drillet, Y. (2020). Water mass analysis along 22 °N in the subtropical North Atlantic for the JC150 cruise (GEOTRACES, GApr08). Deep Sea Research Part I: Oceanographic Research Papers, 158, 103230. doi:10.1016/j.dsr.2020.103230

    DOI: 10.1016/j.dsr.2020.103230

    Carbon on the Northwest European Shelf: Contemporary Budget and Future Influences (Journal article)

    Legge, O., Johnson, M., Hicks, N., Jickells, T., Diesing, M., Aldridge, J., . . . Williamson, P. (2020). Carbon on the Northwest European Shelf: Contemporary Budget and Future Influences. FRONTIERS IN MARINE SCIENCE, 7. doi:10.3389/fmars.2020.00143

    DOI: 10.3389/fmars.2020.00143

    2019

    Iron Distribution in the Subtropical North Atlantic: The Pivotal Role of Colloidal Iron (Journal article)

    Kunde, K., Wyatt, N. J., Gonzalez-Santana, D., Tagliabue, A., Mahaffey, C., & Lohan, M. C. (2019). Iron Distribution in the Subtropical North Atlantic: The Pivotal Role of Colloidal Iron. GLOBAL BIOGEOCHEMICAL CYCLES, 33(12), 1532-1547. doi:10.1029/2019GB006326

    DOI: 10.1029/2019gb006326

    Seasonal and spatial variability in the optical characterstics of DOM in a temperate shelf sea (Journal article)

    Carr, N., Davis, C. E., Blackbird, S., Daniels, L. R., Preece, C., Woodward, M., & Mahaffey, C. (2019). Seasonal and spatial variability in the optical characterstics of DOM in a temperate shelf sea. PROGRESS IN OCEANOGRAPHY, 177. doi:10.1016/j.pocean.2018.02.025

    DOI: 10.1016/j.pocean.2018.02.025

    Seasonal organic matter dynamics in a temperate shelf sea (Journal article)

    Davis, C. B., Blackbird, S., Wolff, G., Woodward, M., & Mahaffey, C. (2019). Seasonal organic matter dynamics in a temperate shelf sea. PROGRESS IN OCEANOGRAPHY, 177. doi:10.1016/j.pocean.2018.02.021

    DOI: 10.1016/j.pocean.2018.02.021

    Arctic Cafe (Media)

    Heath, A. E., & Mahaffey, C. (2019). Arctic Cafe. [Poster for schools]. Retrieved from https://arcticarise.wordpress.com/outreach

    Now versus 1980 (Media)

    Heath, A. E., & Mahaffey, C. (2019). Now versus 1980. [Poster for schools]. Retrieved from https://arcticarise.wordpress.com/outreach

    Polar News and Isotopes (Media)

    Heath, A. E., & Mahaffey, C. (2019). Polar News and Isotopes. [Poster for schools]. Retrieved from https://arcticarise.wordpress.com/outreach

    Temporal and spatial trends in marine carbon isotopes in the Arctic Ocean and implications for food web studies (Journal article)

    de la Vega, C., Jeffreys, R. M., Tuerena, R., Ganeshram, R., & Mahaffey, C. (2019). Temporal and spatial trends in marine carbon isotopes in the Arctic Ocean and implications for food web studies. GLOBAL CHANGE BIOLOGY, 25(12), 4116-4130. doi:10.1111/gcb.14832

    DOI: 10.1111/gcb.14832

    Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid-ocean Ridges (Journal article)

    Tuerena, R. E., Williams, R. G., Mahaffey, C., Vic, C., Green, J. A. M., Naveira-Garabato, A., . . . Sharples, J. (2019). Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid-ocean Ridges. GLOBAL BIOGEOCHEMICAL CYCLES, 33(8), 995-1009. doi:10.1029/2019GB006214

    DOI: 10.1029/2019GB006214

    Diurnal variability in alkaline phosphatase activity and the potential role of zooplankton (Journal article)

    Davis, C. E., Tagliabue, A., & Mahaffey, C. (n.d.). Diurnal variability in alkaline phosphatase activity and the potential role of zooplankton. Limnology and Oceanography Letters. doi:10.1002/lol2.10104

    DOI: 10.1002/lol2.10104

    2017

    Elevated alkaline phosphatase activity in a phosphate-replete environment: Influence of sinking particles (Journal article)

    Davis, C. E., & Mahaffey, C. (2017). Elevated alkaline phosphatase activity in a phosphate-replete environment: Influence of sinking particles. LIMNOLOGY AND OCEANOGRAPHY, 62(6), 2389-2403. doi:10.1002/lno.10572

    DOI: 10.1002/lno.10572

    Temporal variability of nitrogen fixation and particulate nitrogen export at Station ALOHA (Journal article)

    Bottjer, D., Dore, J. E., Karl, D. M., Letelier, R. M., Mahaffey, C., WIlson, S. T., . . . Church, M. J. (2017). Temporal variability of nitrogen fixation and particulate nitrogen export at Station ALOHA. Limnology and Oceanography, 62(1), 200-216. doi:10.1002/lno.10386

    DOI: 10.1002/lno.10386

    2016

    Glider observations of enhanced deep water upwelling at a shelf break canyon: A mechanism for cross-slope carbon and nutrient exchange (Journal article)

    Porter, M., Inall, M., Hopkins, J., Palmer, M. R., Dale, A. C., Aleynik, J. A., . . . Smeed, D. A. (2016). Glider observations of enhanced deep water upwelling at ashelf break canyon: A mechanism for cross-slope carbon andnutrient exchange. Journal of Geophysical Research: Oceans.

    Glider observations of enhanced deep water upwelling at a shelf break canyon: A mechanism for cross-slope carbon and nutrient exchange (Journal article)

    Porter, M., Inall, M. E., Hopkins, J., Palmer, M. R., Dale, A. C., Aleynik, D., . . . Smeed, D. A. (2016). Glider observations of enhanced deep water upwelling at a shelf break canyon: A mechanism for cross-slope carbon and nutrient exchange. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 121(10), 7575-7588. doi:10.1002/2016JC012087

    DOI: 10.1002/2016JC012087

    2015

    High levels of heterogeneity in diazotroph diversity and activity within a putative hotspot for marine nitrogen fixation (Journal article)

    Messer, L. F., Mahaffey, C., Robinson, C. M., Jeffries, T. C., Baker, K. G., Isaksson, J. B., . . . Seymour, J. R. (2016). High levels of heterogeneity in diazotroph diversity and activity within a putative hotspot for marine nitrogen fixation. ISME JOURNAL, 10(6), 1499-1513. doi:10.1038/ismej.2015.205

    DOI: 10.1038/ismej.2015.205

    Environmental controls on the biogeography of diazotrophy and Trichodesmium in the Atlantic Ocean (Journal article)

    Snow, J. T., Schlosser, C., Woodward, E. M. S., Mills, M. M., Achterberg, E. P., Mahaffey, C., . . . Moore, C. M. (2015). Environmental controls on the biogeography of diazotrophy and Trichodesmium in the Atlantic Ocean. GLOBAL BIOGEOCHEMICAL CYCLES, 29(6), 865-884. doi:10.1002/2015GB005090

    DOI: 10.1002/2015GB005090

    2014

    Alkaline phosphatase activity in the subtropical ocean: insights from nutrient, dust and trace metal addition experiments (Journal article)

    Mahaffey, C., Reynolds, S., Davis, C., & Lohan, M. (2014). Alkaline phosphatase activity in the subtropical ocean: insights from nutrient, dust and trace metal addition experiments. Frontiers in Marine Science. doi:10.3389/fmars.2014.00073

    DOI: 10.3389/fmars.2014.00073

    A storm in a shelf sea: Variation in phosphorus distribution and organic matter stoichiometry (Journal article)

    Davis, C. E., Mahaffey, C., Wolff, G. A., & Sharples, J. (2014). A storm in a shelf sea: Variation in phosphorus distribution and organic matter stoichiometry. GEOPHYSICAL RESEARCH LETTERS, 41(23), 8452-8459. doi:10.1002/2014GL061949

    DOI: 10.1002/2014GL061949

    A storm in a shelf sea: variation in organic matter distribution and stoichiometry (Journal article)

    Davis, C., Mahaffey, C., Wolff, G., & Sharples, J. (2014). A storm in a shelf sea: variation in organic matter distribution and stoichiometry. Geophysical Research Letters.

    Evidence for production and lateral transport of dissolved organic phosphorus in the eastern subtropical North Atlantic (Journal article)

    Reynolds, S., Mahaffey, C., Roussenov, V., & Williams, R. G. (2014). Evidence for production and lateral transport of dissolved organic phosphorus in the eastern subtropical North Atlantic. GLOBAL BIOGEOCHEMICAL CYCLES, 28(8), 805-824. doi:10.1002/2013GB004801

    DOI: 10.1002/2013GB004801

    2013

    Equatorial upwelling enhances nitrogen fixation in the Atlantic Ocean (Journal article)

    Subramaniam, A., Mahaffey, C., Johns, W., & Mahowald, N. (2013). Equatorial upwelling enhances nitrogen fixation in the Atlantic Ocean. Geophysical Research Letters, 40(9), 1766-1771. doi:10.1002/grl.50250

    DOI: 10.1002/grl.50250

    The maintenance of the subsurface chlorophyll maximum in the stratified western Irish Sea (Journal article)

    Williams, C., Sharples, J., Green, M., Mahaffey, C., & Rippeth, T. (2013). The maintenance of the subsurface chlorophyll maximum in the stratified western Irish Sea. Limnology and Oceanography: Fluids and Environments, 3(1), 61-73. doi:10.1215/21573689-2285100

    DOI: 10.1215/21573689-2285100

    The maintenance of the subsurface chlorophyll maximum in the stratified western Irish Sea. (Journal article)

    Williams, C. W., Sharples, J. S., Green, M., Mahaffey, C., & Rippeth, R. (2013). The maintenance of the subsurface chlorophyll maximum in the stratified western Irish Sea.. Limnology and Oceanography: Fluids and Environments, 3, 1-14.

    Wind-driven nutrient pulses to the subsurface chlorophyll maximum in seasonally stratified shelf seas (Journal article)

    Williams, C., Sharples, J., Mahaffey, C., & Rippeth, T. (2013). Wind-driven nutrient pulses to the subsurface chlorophyll maximum in seasonally stratified shelf seas. GEOPHYSICAL RESEARCH LETTERS, 40(20), 5467-5472. doi:10.1002/2013GL058171

    DOI: 10.1002/2013GL058171

    Wind-driven nutrient pulses to the subsurface chlorophyll maximum in seasonally stratified shelf seas (Journal article)

    Williams, C., Sharples, J., Mahaffey, C., & Rippeth, T. (2013). Wind-driven nutrient pulses to the subsurface chlorophyll maximum in seasonally stratified shelf seas. Geophysical Research Letters, 40(20), 5467-5472. doi:10.1002/2013gl058171

    DOI: 10.1002/2013gl058171

    2012

    Phytoplankton response to deep seawater nutrient addition in the North Pacific Subtropical Gyre (Journal article)

    Mahaffey, C., Björkman, K. M., & Karl, D. M. (2012). Phytoplankton response to deep seawater nutrient addition in the North Pacific Subtropical Gyre. Marine Ecology Progress Series, 460, 13-34. doi:10.3354/meps09699

    DOI: 10.3354/meps09699

    Predictable and efficient carbon sequestration in the North Pacific Ocean supported by symbiotic nitrogen fixation (Journal article)

    Karl, D. M., Church, M. J., Dore, J. E., Letelier, R. M., & Mahaffey, C. (2012). Predictable and efficient carbon sequestration in the North Pacific Ocean supported by symbiotic nitrogen fixation. Proceedings of the National Academy of Sciences, 109(6), 1842-1849. doi:10.1073/pnas.1120312109

    DOI: 10.1073/pnas.1120312109

    Short-term and seasonal variation in metabolic balance in Liverpool Bay (Journal article)

    Panton, A., Mahaffey, C., Greenwood, N., Hopkins, J., Montagnes, D., & Sharples, J. (2012). Short-term and seasonal variation in metabolic balance in Liverpool Bay. OCEAN DYNAMICS, 62(2), 295-306. doi:10.1007/s10236-011-0494-4

    DOI: 10.1007/s10236-011-0494-4

    2011

    Spatial and temporal variability in nutrient concentrations in Liverpool Bay, a temperate latitude region of freshwater influence (Journal article)

    Greenwood, N., Hydes, D. J., Mahaffey, C., Wither, A., Barry, J., Sivyer, D., . . . Lees, H. E. (2011). Spatial and temporal variability in nutrient concentrations in Liverpool Bay, a temperate latitude region of freshwater influence. Ocean Dynamics, 61, 2181-2199.

    2010

    Assessing the spatial and temporal variability of dissolved organic matter in Liverpool Bay using excitation–emission matrix fluorescence and parallel factor analysis (Journal article)

    Yamashita, Y., Panton, A., Mahaffey, C., & Jaffé, R. (2011). Assessing the spatial and temporal variability of dissolved organic matter in Liverpool Bay using excitation–emission matrix fluorescence and parallel factor analysis. Ocean Dynamics, 61(5), 569-579. doi:10.1007/s10236-010-0365-4

    DOI: 10.1007/s10236-010-0365-4

    2009

    Physical forcing of nitrogen fixation and diazotroph community structure in the North Pacific subtropical gyre (Journal article)

    Church, M. J., Mahaffey, C., Letelier, R. M., Lukas, R., Zehr, J. P., & Karl, D. M. (2009). Physical forcing of nitrogen fixation and diazotroph community structure in the North Pacific subtropical gyre. Global Biogeochemical Cycles, 23(2), n/a. doi:10.1029/2008gb003418

    DOI: 10.1029/2008gb003418

    The relationship between dissolved hydrogen and nitrogen fixation in ocean waters (Journal article)

    Moore, R. M., Punshon, S., Mahaffey, C., & Karl, D. M. (2009). The relationship between dissolved hydrogen and nitrogen fixation in ocean waters. Deep-Sea Research, Part I, 56(9), 1401-1604.

    2008

    Amazon River enhances diazotrophy and carbon sequestration in the tropical North Atlantic Ocean (Journal article)

    Subramaniam, A., Yager, P. L., Carpenter, E. J., Mahaffey, C., Bjorkman, K., Cooley, S., . . . Capone, D. G. (2008). Amazon River enhances diazotrophy and carbon sequestration in the tropical North Atlantic Ocean. Proceedings of the National Academy of Sciences, 105(30), 10460-10465. doi:10.1073/pnas.0710279105

    DOI: 10.1073/pnas.0710279105

    Assessment of relative phosphorus limitation of Trichodesmium spp. in the North Pacific, North Atlantic, and the north coast of Australia (Journal article)

    Sohm, J. A., Mahaffey, C., & Capone, D. G. (2008). Assessment of relative phosphorus limitation of Trichodesmium spp. in the North Pacific, North Atlantic, and the north coast of Australia. Limnology and Oceanography, 53(6), 2495-2502. doi:10.4319/lo.2008.53.6.2495

    DOI: 10.4319/lo.2008.53.6.2495

    Nitrogen dynamics within a wind-driven eddy (Journal article)

    Mahaffey, C., Benitez-Nelson, C. R., Bidigare, R. R., Rii, Y., & Karl, D. M. (2008). Nitrogen dynamics within a wind-driven eddy. Deep Sea Research Part II: Topical Studies in Oceanography, 55(10-13), 1398-1411. doi:10.1016/j.dsr2.2008.02.004

    DOI: 10.1016/j.dsr2.2008.02.004

    The Nitrogen Cycle in the North Pacific Trades Biome: an Evolving Paradigm (Chapter)

    Karl, D. M., Bidigare, R. R., Church, M. J., Dore, J. E., Letelier, R. M., Mahaffey, C., & Zehr, J. (2008). The Nitrogen Cycle in the North Pacific Trades Biome: an Evolving Paradigm. In D. G. Capone, E. J. Carpenter, M. Mulholland, & D. A. Bronk (Eds.), Nitrogen in the Marine Environment (pp. in press.). New York: Academic Press.

    2007

    Influence of the Amazon River plume on distributions of free-living and symbiotic cyanobacteria in the western tropical north Atlantic Ocean (Journal article)

    Foster, R. A., Subramaniam, A., Mahaffey, C., Carpenter, E. J., Capone, D. G., & Zehr, J. P. (2007). Influence of the Amazon River plume on distributions of free-living and symbiotic cyanobacteria in the western tropical north Atlantic Ocean. Limnology and Oceanography, 52(2), 517-532. doi:10.4319/lo.2007.52.2.0517

    DOI: 10.4319/lo.2007.52.2.0517

    Isotopic heterogeneity and cycling of organic nitrogen in the oligotrophic ocean (Journal article)

    Meador, T. B., Aluwihare, L. I., & Mahaffey, C. (2007). Isotopic heterogeneity and cycling of organic nitrogen in the oligotrophic ocean. Limnology and Oceanography, 52(3), 934-947. doi:10.4319/lo.2007.52.3.0934

    DOI: 10.4319/lo.2007.52.3.0934

    Mesoscale Eddies Drive Increased Silica Export in the Subtropical Pacific Ocean (Journal article)

    Benitez-Nelson, C. R., Bidigare, R. R., Dickey, T. D., Landry, M. R., Leonard, C. L., Brown, S. L., . . . Yang, E. J. (2007). Mesoscale Eddies Drive Increased Silica Export in the Subtropical Pacific Ocean. Science, 316(5827), 1017-1021. doi:10.1126/science.1136221

    DOI: 10.1126/science.1136221

    2006

    Does the transport of dissolved organic nutrients affect export production in the Atlantic Ocean? (Journal article)

    Roussenov, V., Williams, R. G., Mahaffey, C., & Wolff, G. A. (2006). Does the transport of dissolved organic nutrients affect export production in the Atlantic Ocean?. GLOBAL BIOGEOCHEMICAL CYCLES, 20(3). doi:10.1029/2005GB002510

    DOI: 10.1029/2005GB002510

    2005

    Nitrogen fixation by Trichodesmium spp.: An important source of new nitrogen to the tropical and subtropical North Atlantic Ocean (Journal article)

    Capone, D. G., Burns, J. A., Montoya, J. P., Subramaniam, A., Mahaffey, C., Gunderson, T., . . . Carpenter, E. J. (2005). Nitrogen fixation by Trichodesmium spp.: An important source of new nitrogen to the tropical and subtropical North Atlantic Ocean. Global Biogeochemical Cycles, 19(GB2024).

    The conundrum of marine N2 fixation (Journal article)

    Mahaffey, C. (2005). The conundrum of marine N2 fixation. American Journal of Science, 305(6-8), 546-595. doi:10.2475/ajs.305.6-8.546

    DOI: 10.2475/ajs.305.6-8.546

    2004

    Physical supply of nitrogen to phytoplankton in the Atlantic Ocean (Journal article)

    Mahaffey, C., Williams, R. G., Wolff, G. A., & Anderson, W. T. (2004). Physical supply of nitrogen to phytoplankton in the Atlantic Ocean. GLOBAL BIOGEOCHEMICAL CYCLES, 18(1). doi:10.1029/2003GB002129

    DOI: 10.1029/2003GB002129

    2003

    Biogeochemical signatures of nitrogen fixation in the eastern North Atlantic (Journal article)

    Mahaffey, C., Williams, R. G., Wolff, G. A., Mahowald, N., Anderson, W., & Woodward, M. (2003). Biogeochemical signatures of nitrogen fixation in the eastern North Atlantic. GEOPHYSICAL RESEARCH LETTERS, 30(6). doi:10.1029/2002GL016542

    DOI: 10.1029/2002GL016542

    2000

    Particle export within cyclonic Hawaiian lee eddies derived from 210Pb–210Po disequilibrium (Journal article)

    Verdeny, E., Masqué, P., Maiti, K., Garcia-Orellana, J., Bruach, J. M., Mahaffey, C., & Benitez-Nelson, C. R. (2008). Particle export within cyclonic Hawaiian lee eddies derived from 210Pb–210Po disequilibrium. Deep Sea Research Part II: Topical Studies in Oceanography, 55(10-13), 1461-1472. doi:10.1016/j.dsr2.2008.02.009

    DOI: 10.1016/j.dsr2.2008.02.009