Staff details

Dr Maeve Lohan

Job title: Lecturer in Biogeochemistry and Environmental Analytical Chemist, School of Geography, Earth and Environmental Sciences
Address: ,
Telephone: +44 (0)1752 584569
Email: maeve.lohan@plymouth.ac.uk

Qualifications & background

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

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.

Publications

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

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:10.1029/2009JC005452.

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.

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. (2009). Iron biogeochemistry across marine systems at changing times – conclusions from the workshop held in Gothenburg, Sweden (14–16 May 2008) Biogeosciences 6: 6635-6694.

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:

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:
2009:

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