Photo of Professor Claire Mahaffey

Professor Claire Mahaffey BSc, PhD

Professor of Ocean Sciences Earth, Ocean and Ecological Sciences

Publications

2021

An Arctic Strait of Two Halves: The Changing Dynamics of Nutrient Uptake and Limitation Across the Fram Strait (Journal article)

Tuerena, R. E., Hopkins, J., Buchanan, P. J., Ganeshram, R. S., Norman, L., Appen, W., . . . Mahaffey, C. (2021). An Arctic Strait of Two Halves: The Changing Dynamics of Nutrient Uptake and Limitation Across the Fram Strait. Global Biogeochemical Cycles, 35(9). doi:10.1029/2021gb006961

DOI: 10.1029/2021gb006961

The Importance of Water Mass Transport and Dissolved-Particle Interactions on the Aluminum Cycle in the Subtropical North Atlantic (Journal article)

Artigue, L., Wyatt, N. J., Lacan, F., Mahaffey, C., & Lohan, M. C. (2021). The Importance of Water Mass Transport and Dissolved-Particle Interactions on the Aluminum Cycle in the Subtropical North Atlantic. GLOBAL BIOGEOCHEMICAL CYCLES, 35(5). doi:10.1029/2020GB006569

DOI: 10.1029/2020GB006569

A warm jet in a cold ocean. (Journal article)

MacKinnon, J. A., Simmons, H. L., Hargrove, J., Thomson, J., Peacock, T., Alford, M. H., . . . Wood, K. R. (2021). A warm jet in a cold ocean. NATURE COMMUNICATIONS, 12(1). doi:10.1038/s41467-021-22505-5

DOI: 10.1038/s41467-021-22505-5

Arctic seals as tracers of environmental and ecological change (Journal article)

de la Vega, C., Mahaffey, C., Tuerena, R. E., Yurkowski, D. J., Ferguson, S. H., Stenson, G. B., . . . Jeffreys, R. M. (n.d.). Arctic seals as tracers of environmental and ecological change. Limnology and Oceanography Letters. doi:10.1002/lol2.10176

DOI: 10.1002/lol2.10176

Nitrate assimilation and regeneration in the Barents Sea: insights from nitrate isotopes (Journal article)

Tuerena, R. E., Hopkins, J., Ganeshram, R. S., Norman, L., de la Vega, C., Jeffreys, R., & Mahaffey, C. (2021). Nitrate assimilation and regeneration in the Barents Sea: insights from nitrate isotopes. BIOGEOSCIENCES, 18(2), 637-653. doi:10.5194/bg-18-637-2021

DOI: 10.5194/bg-18-637-2021

2020

GO-SHIP Repeat Hydrography Nutrient Manual: The Precise and Accurate Determination of Dissolved Inorganic Nutrients in Seawater, Using Continuous Flow Analysis Methods (Journal article)

Becker, S., Aoyama, M., Woodward, E. M. S., Bakker, K., Coverly, S., Mahaffey, C., & Tanhua, T. (2020). GO-SHIP Repeat Hydrography Nutrient Manual: The Precise and Accurate Determination of Dissolved Inorganic Nutrients in Seawater, Using Continuous Flow Analysis Methods. Frontiers in Marine Science, 7. doi:10.3389/fmars.2020.581790

DOI: 10.3389/fmars.2020.581790

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., González-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

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., 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

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 changes in plankton respiration and bacterial metabolism in a temperate shelf sea (Journal article)

Garcia-Martin, E. E., Daniels, C. J., Davidson, K., Davis, C. E., Mahaffey, C., Mayers, K. M. J., . . . Robinson, C. (2019). Seasonal changes in plankton respiration and bacterial metabolism in a temperate shelf sea. PROGRESS IN OCEANOGRAPHY, 177. doi:10.1016/j.pocean.2017.12.002

DOI: 10.1016/j.pocean.2017.12.002

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

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

Tuerena, R., Williams, R., Mahaffey, C., Clément Vic, J., Green, M., Naveira-Garabato, A., . . . Sharples, J. (2019). Internal Tides Drive Nutrient Fluxes Into the Deep Chlorophyll Maximum Over Mid-ocean Ridges. Global Biogeochemical Cycles: an international journal of global change, 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

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

Davis, C., & Mahaffey, C. (n.d.). Elevated alkaline phosphatase activity in a phosphate-replete environment: influence of sinking particles in phosphorus remineralisation. Limnology and Oceanography.

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

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, 1499-1513. doi:10.1038/ismej.2015.205

DOI: 10.1038/ismej.2015.205

2015

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

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

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

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

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.

2013

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

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.

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

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

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.

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

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

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

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

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

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

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

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

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

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

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

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).

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