Professor Maeve Lohan
Profiles

Professor Maeve Lohan

Visiting Professor

School of Geography, Earth and Environmental Sciences (NC) (Faculty of Science and Engineering (NC))

Qualifications

2013-                 Prof. Marine Chemistry 

2010- 2013         Reader (Assioc. Prof) in Biogeochemistry & Environmental Analytic Chemistry
  
2005-2010          Lectuer in Biogeochemistry & Environmental Analytic Chemistry
  
2003-2005          Postdoctoral Researcher with Prof. Ken Bruland
                         Dept. Ocean Science, Univeristy of Califronia Santa Cruz, USA

1999-2003          PhD in Chemical Oceanography

                        School of Ocean and Earth Sciences, University of Southampton

                        Dissertation: Studies on the biogeochemistry of zinc in the North   

                        Pacific Ocean

1998-1999         MSc in Oceanography

                        School of Ocean and Earth Sciences, University of Southampton

                        Dissertation: An investigation of anthropogenic contamination from the Brittish

                        Antarctic reaarch station, Rothera

 

1992-1996         BSc

                        Univeristy College Galway

    

Professional membership

2008 - Present: Associate Editior Limnology and Oceanography Methods

2007-Present: Member of the International GEOTRACES Standards and Intercalibration Committee.   

Challenger Society

American Geophysical Union

American Society for Limnology and Oceanography

Roles on external bodies

2010-Present Scientific Steering Committee member GEOTRACES

2008- Present Working group Chair COST Action ES0801 'The Chemistry of Bioactive trace 
          elements and paleoclimate proxies.

2008- Present: Associate Editior Limnology and Oceanography Methods

2007-Present: Member of the International GEOTRACES Standards and Intercalibration Committee.

Teaching interests

My teaching covers Chemical Oceanography and Environmental Chemistry. I also teach a 2nd year course in Weather and Climate and a 3rd year course on Climate Chnage: Imapcts and Responses. I contribute to both the M.Sc. in applied Marine Science and the B.Sc. (Hons) Environmental Science programmes.

I am also involved in teaching estuarine chemistry on small resarch boats. A website has been designed to aid the learning and teaching process. Link to website

Staff serving as external examiners

Bjorn von der Heyden 'Distribution and characterization of marine iron-rich particles' Stellenbosch Univeristy (South Africa) (October 2013)

Adam Hamilton ' The role of microzooplankton grazing in trace metal biogeochemistry' SEES, Univeristy of Portsmouth (UK) (September 2013)

Marie Sinoir 'Zinc biogeochemical cycle in the Tasman Sea:Potential role for phytoplankton communities' Univeristy of Tasmania (Australia) (January 2013)

Farah Idrus 'Dissolved Manganese and Ocean waters: Analytical and Biogeochemical Studies' National Oceanogrpahy Centre, Southampton (UK)  (June 2012)

Johann Bown 'Biogeochmeical cycle of cobalt in the ocean' Univeristy of Bretangne, Brest, France (July 2011)

Entian Benjamin Ibisanmi ‘The biogeochemistry of iron-complexing ligands in the open ocean’ Otago University, New Zealand (April 2010)

Li Li ‘Sensing of heavy metals in waste waters and is focussing on use of visible spectrometry for measurement’  Dublin City University (March 2010)

Juan Santos Echeandia, ‘Speciation and biogeochemical processes of trace elements in a North-eastern Atlantic Region’. Vigo Spain (Sept. 2009)

Research interests

My research focuses on trace metals biogeochemistry with particular reference to bioactive metals (iron, zinc, and copper). I am interested in the chemical, biological, and physical processes which affect trace element distributions and behaviour in both coastal and open ocean regimes. This research combines speciation studies, trace metal uptake by phytoplankton and analytical chemistry and is approached from two directions: field measurements and laboratory studies with projects ranging from developing a new analytical method for total dissolved iron determinations, to coastal studies on iron chemistry from both river plumes and upwelling, to large scale mapping of zinc concentrations in open ocean regimes and incubation experiments investigating the biological uptake and speciation of zinc and iron. The laboratory utilizes flow injection analysis, inductively coupled plasma mass spectrometry and voltammetric techniques to investigate the distribution and chemical speciation of trace elements in seawater.

Research degrees awarded to supervised students


2014
N. Wyatt (University of Plymouth) " The biogeochemistry of iron, zinc and cobalt in the Atlantic OCean: The Atlantic Meridional Transect and UK GEOTRACES" PhD.

2013
R. McEwan (University of Plymouth) " Interdisciplinary Study of hydrodynamic and biogeochemical process of a large-scale river plume' PhD.

2011
R. Shelley (University of Plymouth) " Cobalt biogeochemistry in the Atlantic Ocean using flow injection chemiluminescence' PhD.

Y. Zhao (University of Bristol) " The carbon cycle and bioactive trace metals in the oceans: constraints from zinc isotopes' PhD.

2008
R. Tuckwell (University of Plymouth) "Flow analysis techniques for the determination of nutrients in natural waters" MPhil.

2007
A. Milne (University of Plymouth) "Marine Biogeochemical studies of iron and hydrogen peroxide using flow injection-chemiluminsecence" PhD.

Grants & contracts

2013-2017 NERC 'The supply of iron from shelf sediments to the ocean'

2012-2015 SCOR Working Group 139 ‘Organic Ligands-A key Control on Trace metal Biogeochemistry in the Ocean’ in collobration with Kristen Buck, BIOS (US) and Sylvia Sander (NZ)

2012-2016 NERC ‘Seasonal controls on shelf-edge nutrient fluxes at the Malin Shelf’

2011-2015 EURAMET grant ‘Providing more reliable methods for the determination of iron in marine waters

2010- 2014 NERC standard grant ‘Physical and chemical forcing of diazotrophy in the (sub)-tropical Atlantic Ocean’

2010- 2014 NERC consortium Grant ‘Ocean micronutrient cycles: UK GEOTRACES’

2009 – 2013 Marie Curie Outgoing fellowship with Bermuda Institute of Ocean Sciences 'Solubility of iron aerosols in open ocean waters, SOLAIROS’  

2006-2008 Nuffield Foundation ‘The role of pH in the bioavailability and/or toxicity of two essential trace metals iron and copper for phytoplankton growth'

           

Research groups

  • Biogeochemistry Research Centre (BGC)

Sander, S., K.N. Buck and M.C. Lohan (2012). Improving understanding of organic metal-binding ligands in the oceans. EOS, 93: 244.

Brown, M.B., Lippiat, S.M., Lohan, M.C. & Bruland, K.W. (2012) Trace metal distributions within a Sitka eddy in the Northern Gulf of Alaska. Limnol. Oceanogr. 57: 503-518.

Buck, K.N., M.C. Lohan and S. Sander (2012). SCOR Working Group 139: Organic ligands- A key control on trace metal biogeochemistry. IUPAC Chemistry International, 34(4): 23.

Shelley, R. U, Sedwick, P.N., Bibby, T.S., Cabedo-Sanz, P., Church, T.M., Johnson, R.J., Macey, A.I., Marsay, C.M., Sholkovitz, E.R., Ussher, S.J., Worsfold, P.J. & Lohan, M.C. (2012) Controls on dissolved cobalt in surface waters of the Sarrgasso Sea: Comparisons with iron and aluminum. Global Biogeochemical Cycles 26: GB2020 DOI: 10.1029/2011/GB004155.

Sedwick, P.N., Marsay, C.M., Aguilar-Islas, A.M., Lohan, M.C., Sohst, B.M., Long, M.C., Arrigo, K.R., Dunbar, R.B., Saito, M.A., Smith, W.O. & DiTullio, G.R. (2011) Early-season depletion of dissolved iron in the Ross Sea polynya: Implications for the iron dynamics on the Antarctic continental shelf. J. Geophys. Res. Oceans . C12019  DOI: 10.1029/2010JC006553    

Lippiat, S.M., Brown, M.B, Lohan, M.C. & Bruland, K.W. (2011) Reactive iron delivery to the Gulf of Alaska via a Kenai eddy. Deep Sea Reserach I 58: 1091-1102.

Turk, K.A., Rees, A.P., Zehr, J.P., Pereria, N., Swift, P., Shelley, R.I., Lohan, M.C., Woodward, E.M.S. & Gilbert, J. (2011) Nitrogen fixation and nitrogenase (nifH) expression in tropical waters of the eastern North Atlantic. ISME Journal 5: 1201-1212.

Shelley, R. U., Zachhuber, B., Sedwick, P.N., Worsfold, P.J. & Lohan, M.C. (2010). Determination of total dissolved cobalt in UV-iradiated seawater using flow injection with chemiluminescence detection. Limnol. Oceangr. Methods, 8 352-362.

Kudela, R. M., Horner-Devine, A.R., Banas, N.S., Hickey, B.M., Peterson, T.D., McCabe, R.M., Lessard, E.L., Frame, E., Bruland, K.W., Jay, D.A., Peterson, J.O., Peterson, W.T., Kosro, P.M., Palacios, S.L., Lohan, M.C. & Dever, E.P. (2010) Multiple trophic levels fueled by recirculation in the Columbia River plume. J. Geophysical Research Letters, 37 DOI: 10.1029/2010GL044342.

Lippiat, S.M., Lohan, M.C., &  Bruland, K.W. (2010). The distribution of reactive iron in northern Gulf of Alaska coastal waters. Mar. Chem. doi:10.1016/j.marchem.2010.04.007

Wyatt, N.J., Kitidis, V., Woodward, E.M.C., Rees, A.P., Widdicombe, S. & Lohan, M.C. (2010). Effects of high CO2 on the fixed nitrogen inventory of the Western English Channel. J. Plankton Research, doi: 10.1093/plankt/fbp140

Lippiat, S.M., Brown, M.T., Lohan, M.C., Berger, C.J.M., Bruland, K.W. (2010). Leachable particulate iron in the Columbia River, estuary and near field plume. Cont. Shelf Sci. doi:10.1016/j.ecss.2009.12.009

Breitbarth, E., Achterberg, E.A., Ardelan, M.V., Baker, A.R., Bucciarelli, E., Chever, F., Croot, P.L., Duggen, S., Gledhill, M., Hassellov, M., Hassler, C., Hoffmann. L.J., Hunter, K.A., Hutchins, D.A., Ingri, J., Jickells, T., Lohan, M.C., Nielsdottir, C., Sarthous, G., Schoemann, V., Trapp, J.M., Turner, D.A. and Ye, Y. (2010). Iron biogeochemistry across marine systems- progress from the past decade. Biogeosciences  7: 1075-1097.

Feng, Y., Hare, C.E., Rose, J.M., Handy, S.M., DiTullio, G.R., Lee, P.A., Smith Jr., W.O., Peloquin, J., Tozzi, S., Sun, J., Zhang,Y., Dunbar, R.B., Long, C.M., Sohst, B., Lohan, M.C., Hutchins, D.A. (2009). Interactive effects of iron, irradicane and CO2 on Ross Sea phytoplankton. Deep Sea Res. I doi:10.1016/j.dsr 2009.10.013.

Hickey, B. M., Kudela, R. M. Nash, J. D. Bruland, K. W. Peterson, W. T. MacCready, P. Lessard, E. J.. Jay, D. A. Banas, N. S Baptista, A. M. Dever, E. P. Kosro, P. M. Kilcher, L. K. Horner-Devine, A. R. Zaron, E. D. McCabe, R. M. Peterson, J. O. Orton, P. M.. Pan, J & Lohan M. C (2009). River Influences on Shelf Ecosystems:  Introduction and Synthesis. J. Geophys. Res. Oceans  doi: 10.1029/JC005452.

Rose, J.M., Feng, Y., DiTullio, G.R., Dunbar, R.B., Hare, C.E., Lee, P.A, Lohan, M.C., Long, M., Smith Jr, W.O., Sohst, B., Tozzi, S., Zhang, Y., and Hutchins, D.A. (2009). Synergistic effects of iron and temperature on Antarctic plankton assemblages. Biogeosciences 6, 5849-5889.

Bowie, A.R. & Lohan, M.C. (2009). Determination of iron in seawater. In: Practical Guidelines for the analysis of seawater (ed. Oliver Wurl), CRC Press, Taylor Francis group, pp 235-258.

Bruland, K.W., Lohan, M.C., Aguilar-Islas, A.M., Smith, G.J., Sohst, B. & Baptista, A. (2008). Factors influencing the chemistry of the near-field Columbia River plume: nitrate, silicic acid, dissolved Fe and dissolved Mn. Journal of Geophysical Research: Oceans. 113, C00B02, doi:10.1029/2007JC004702.

Vance, D., Archer, C., Bermin, J., Perkins, J., Statham, P.J., Lohan, M.C., Ellwood, M.J. & Mills, R.A. (2008). The copper isotope geochemistry of rivers and the oceans. Earth Planetary Science Letters 274: 204-213
 
Lohan, M.C. & Bruland, K.W. (2008).  Elevated Fe(II) and dissolved Fe in hypoxic shelf waters off Oregon and Washington: an enhanced source of iron to coastal upwelling regimes. Environmental Science & Technology 42: 6462-6468. 
 
Aguilar-Islas, A.M., Hurst, M. P., Buck, K. N., Sohst, B., Smith, G.J., Lohan, M.C. & Bruland, K.W. (2007). Micro- and macronutrients in the southeastern Bering Sea: Insight into iron-replete and iron-depleted regimes. Progress in Oceanography  73 (2) 99-126.

Johnson, K.S., Boyle, E.A., Bruland, K.W., Coale, K, Measures, C.I., Moffett, J.W., Aguilar-Islas, A.M., Barbeau, K., Berguist, B., Bowie, A.R., Buck, K.N., Chase, Z., Cullen, J., Doi, T., Elrod, V., Fitzwater, S., Gordon, M., Laan, P., Laglera-Baquer, L., Landing, W.M., Lohan, M.C., Mendez, J., Milne, A., Obata, H., Ossiander, L., Plant, J., Sarthou, G., Sedwick, P., Smith, G., Sosht, B., Tanner, S., Van den berg, S., Wu, J. (2007). Developing standards for dissolved iron in seawater. EOS 88 (11) 131-132.

Betrand, E.M., Saito, M.A., Rose, J.R., Riesselman, C.R., Lohan, M.C. and Noble, A.E. (2007). Vitamin B12 and iron co-limitation of phytoplankton growth in the Ross Sea. Limnology and Oceanography 52 (3) 1079-1093. 

Buck, K.N., Lohan, M.C., Berger, C.M and Bruland, K.W. (2007). Dissolved iron speciation in two distinct river plumes and an estuary: Implications for riverine iron supply. Limnology and Oceanography 52 (2) 843-855.

Lohan, M.C. and Bruland, K.W. 2006. Direct determination of iron in acidified (pH 1.7) seawater samples by flow injection analysis with catalytic spectrophotometric detection: Application and intercomparison. Limnology and Oceanography Methods 4: 164-171.

Lohan, M.C. and Bruland, K.W. 2006 Importance of Vertical Mixing for Additional Sources of Nitrate and Iron to Surface Waters of the Columbia River Plume: Implications for Biology. Marine Chemistry 98: 260-273. 

Crispo, S.M., Peterson, T. and Lohan, M.C. 2005. Implications of an Asian dust storm on the Gulf of Alaska. Sea Technology 46(9): 29-37.

Leblanc, K., Hare, C.E., Boyd, P.W., Bruland, K.W., Sohst, B., Pickmere, S., Lohan, M.C., Buck, K., Elwood, M. and Hutchins, D.A. 2005. Fe and Zn effects on Si cycle and diatom community structure in two contrasting high and low silicate HNLC areas.  Deep Sea Res. 52: 1842-1864.

Lohan, M.C, Crawford, D.W., Purdie, D.A. and Statham, P.J. 2005. Iron and zinc enrichment in the northeastern subarctic Pacific: ligand production and zinc bioavailability in response to phytoplankton growth. Limnol. Oceanogr. 50: 1427-1437.

Lohan, M.C., Aguilar-Islas, A.M., Franks, R.P. and Bruland, K.W. 2005. Determination of iron and copper in seawater at pH 1.7 with a new commercially available chelating resin, NTA Superflow. Anal. Chim. Acta 530: 121-129.

Bruland, K.W. and Lohan, M.C. 2004. Controls on trace metals in seawater, In the Oceans and Marine Geochemistry (ed. H. Elderfield) Vol 6. Treatise on Geochemistry (eds. H.D. Holland and K.K. Turekian), Elsevier London. pp. 23-49.

 

Crawford, D.W., Lispen, M.S., Lohan M.C., Purdie, D.A, Statham, P.J., Whitney, F.A., Johnson, K., Sutherland, N. and Wong C.S. 2003. Influence of zinc and iron enrichments on phytoplankton growth in the North eastern Subarctic Pacific. Limnol. Oceanogr. 48: 1583-1600.

 

Lohan M.C., Statham P.J. and Crawford D.W. 2002. Total dissolved Zinc in the upper water column of the subarctic North east Pacific. Deep–Sea Res. II (24-25) 5793-5808.

Lohan M.C., Statham P.J. and Peck L. 2001. Trace metals in the Antarctic soft-shelled Laternula elliptica: implications for metal pollution from Antarctic research stations. Polar Biology 24: 808-817.

Reports & invited lectures

Invited lectures: 

Implications of future climate scenarios on the biogeochemical cycling of iron in the Ross Sea. University of Liverpool, March, 2010.

Effects of ocean acidification and hypoxia on iron biogeochemistry in shelf seas and the open ocean. Scottish Assiocation for Marine Science, Oban, June 2009.

Impact of Ocean Acidification on iron Biogeochemistry. Royal Society of Chemistry, University of Plymouth, September, 2008.

Effects of ocean acidification on iron biogeochemistry in shelf seas and the open ocean. Bristol University, Earth Science, April 2008

Nutrient cycling in the Columbia River Plume: The role of tidal mixing and upwelling as sources of dissolved iron and nitrate. Proudman Oceanogrpahic Laboratory, May 2007.

The Biogeochemistry of zinc in the subarctic North Pacific. UC Santa Cruz Marine Sciences Seminar Fall 2003.

The Biogeochemistry of zinc and its interaction with phytoplankton in the subarctic North Pacific. University College Galway, January 2003.

Conferences:

2012:

Lohan, M.C. Organic ligands: A key control on trace metal biogeochemistry in the Ocean, Invited talk: Ocean Sciences, Salt Lake City, USA

Milne, A.M., Lohan, M.C, Achterberg, E.A. Woodward, E.M.S. Dissolved Co distributions in the (sub) tropical Atlantic Ocean as part of the GEOTRACES A06 cruise. Ocean Sciences, Salt Lake City, USA


2010:


Lohan, M.C.,
Sedwick, P.N., Marsay, C.M., Hutchins, D.A. & DiTullio, G.R. The impacts of increased ice cover, CO2 and light on iron speciation in the Ross Sea. Oral presentation, Ocean Sciences, Portland, USA

Shelley, R.U., Sedwick, P.N., Bibby, T.S., Worsfold, P.J. & Lohan, M.C. Impacts of mesoscale eddies and phytoplankton dynamics on the biogeochemical cycling of dissolved cobalt and iron in the oligotrophic Sargasso Sea. Oral presentation, Ocean Sciences, Portland, USA

Sedwick, P.N., Lohan, M.C., Marsay, C.M., Aguilar-Isals, A.M. & DiTullio, G.R. Implications of future climate scenarios on the biogeochemical cycling of iron in the Ross Sea Ocean Sciences, Portland, USA

Shelley, R.U., Zachhuber, B., Worsfold, P.J. & Lohan, M.C. Flow Injection with chemiluminescence detection for the determination of total dissolved cobalt in open ocean waters Analytical Research Forum, Loughborough University, UK

2009:

Combined effects of hypoxia and high pCO2 on iron speciation. IMBER Conference 2009 Invited Speaker.

Shelley, R.U., Zachhuber, B., Sedwick, P.N. Worsfold, P.J. Lohan, M.C. Impacts of dust deposition and mesoscale eddies on the distributions of dissolved cobalt and iron in the western subtropical North Atlantic Ocean, Challenger Society, London

The effects of increased temperatures, CO2 and light of iron speciation in the Ross Sea. Lohan, M.C., Sedwick, P.N, Marsay, C.M, Rose, J., Feng, Y., Hutchins, D.A. Oral Presentation, ASLO Nice, France.

2008:

Dyanmics and Speciation of dissolved iron in the Sargasso Sea (BATS Region). Sedwick, P.N, Marsay, C.M, Bowiem A., Church, T., Cullen, J., Giesbrecht, T., Johnson, R., Lohan, M.C., McGuillicuddy, D., Ussher, S.  Oral Presentation. AGU San Francisco December.

The effects of increased temperatures, CO2 and light of iron speciation in the Ross Sea. Lohan, M.C., Sedwick, P.N, Marsay, C.M, Rose, J., Feng, Y., Hutchins, D.A. Oral Presentation, Challenger Society Conference, Bangor, Wales, September.

A new source of iron to coastal upwelling regimes. Lohan, M.C., Bruland, K.W. Oral Presentation, ASLO/AGU meeting Orlando Febuary

Pronounced temporal and mesoscale variability of dissolved iron in the Sargasso Sea. Marsay, C.M., Sedwick, P.N., Johnson, R.J., Lohan, M.C., McGillicuddy, D.J. Oral Presentation, ASLO/AGU meeting Orlando Febuary

Early and Pervasive iron limitation in the Ross Sea Polynya. Sedwick, P.N., Marsay, C.M., Aguilar-Islas, A.M., Lohan, M.C., DiTullio, G.R. Oral Presentation, ASLO/AGU meeting Orlando Febuary.

2006:
Iron cycling in the Columbia River Plume: The role of tidal mixing and upwelling as sources of dissolved iron. Challenger Society Marine Science Conference, Oban, Scotland Septemeber.
Iron cycling in the Columbia River Plume: The role of tidal mixing and upwelling as sources of dissolved iron. Goldschmidt Conference, Melbourne, August. Invited Speaker.

Benthic Sources of Iron to the Columbia River Plume.  ASLO/AGU meeting Hawaii Febuary.

2004:
Importance of Vertical Mixing for Additional Sources of Nitrate and Iron to Surface Waters of the Columbia River Plume: Implications for Biology. AGU Fall meeting, San Francisco December

Phytoplankton response to low zinc concentrations upon the addition of iron in the HNLC NE Pacific Ocean.  ASLO meeting, Hawaii Febuary.

2003:
Impact of added zinc and iron on phytoplankton growth in the subarctic North Pacific. CEBIC meeting, Princeton University, June.
2002:
Impact of added zinc and iron on phytoplankton growth in the subarctic North Pacific. Oral  Challenger Marine Science conference, University of Plymouth September.
The role of zinc in oceanic phytoplankton.  ASLO meeting, Hawaii February.
2001:

Total dissolved zinc in the upper water column of the subarctic North east Pacific. PICES, Victoria, Vancouver Island, October.