Helmuth Thomas

Press Coverage

Chemical Institute of Canada - July 2019 - Roberta Staley: Oceans facing an acid test

Chronicle Herald Halifax, Canada - August, 13th, 2017 - METCALFE: Acidified oceans seek equilibrium

Ocean Acidification in the Gulf of Maine

O'Chang Movie - March, 10th, 2016 - A Climate Calamity in the Gulf of Maine (II)

Press Release

Radio Canada International - August, 21st, 2013 - Scientists find Arctic Ocean more vulnerable to acidification than Antarctic

Recent Publications

Van Dam, B., Zeller, M. A., Lopes, C., Smyth, A. R., Böttcher, M. E., Osburn, C. L., Zimmermann, T., Pröfrock, D., Fourqurean, J. W., and Thomas, H. -2021- Calcification-driven CO 2 emissions exceed “Blue Carbon” sequestration in a carbonate seagrass meadow - Science Advances, 7:eabj1372, https://doi.org/10.1126/sciadv.abj1372.

Rutherford, K., K. Fennel, D. Atamanchuk, D. Wallace, and H. Thomas -2021- A modeling study of temporal and spatial pCO2 variability on the biologically active and temperature-dominated Scotian Shelf - Biogeosciences, 18, 6271-6286.

Van Dam, B., C. Lopes, M. A. Zeller, M. Ribas-Ribas, H. Wang, and H. Thomas -2021- Overstated Potential for Seagrass Meadows to Mitigate Coastal Ocean Acidification - Front. Mar. Sci., https://doi.org/10.3389/fmars.2021.729992.

Jiao, N., J. Liu, B. Ewards, Z. Lv, R. Cai, Y. Liu, X. Xiao, J. Wang, F. Jiao, R. Wang, X. Huang, B. Guo, J. Sun, R. Zhang, Y. Zhang, K. Tang, Q. Zheng, F. Azam, J. Batt, W.-J. Cai, C. He, G.J. Herndl, P. Hill, D. Hutchins, J. LaRoche, M. Lewis, H. MacIntyre, L. Polimene, C. Robinson, Q. Shi, C.A. Suttle, H. Thomas, D. Wallace, and L. Legendre -2021- Correcting a major error in assessing organic carbon pollution in natural waters - Science Advances, 7: eabc7318, https://doi.org/10.1126/sciadv.abc7318.

Jiao, N., and H. Thomas -2021- Consider solutions: Mitigation approaches - in IOC-R. 2021. Integrated Ocean Carbon Research: A Summary of Ocean Carbon Research, and Vision of Coordinated Ocean Carbon Research and Observations for the Next Decade. R. Wanninkhof, C. Sabine and S. Aricò (eds.). Paris, UNESCO. 46 pp. (IOC Technical Series, 158.), doi:10.25607/h0gj-pq41, in press.

Van Dam, B., P. Polsenaere, A. Barreras-Apodaca, C. Lopes, Z. Sanchez-Mejia, T. Tokoro, T. Kuwae, L. Gutiérrez Loza, A. Rutgersson, J. Fourqurean, and H. Thomas -2021- Global trends in air-water CO2 exchange over seagrass meadows revealed by atmospheric Eddy Covariance - Glob. Biogeochem. Cycles, 35, e2020GB006848, https://doi.org/10.1029/2020GB006848.

Omar, A. M., García-Ibáñez, M. I., Schaap, A., Oleynik, A., Esposito, M., Jeansson, E., Loucaides, S., Thomas, H., and Alendal, G. -2021- Detection and quantification of CO2 seepage in seawater using the stoichiometric C_seep 2 method: results from a recent subsea CO2 release experiment in the North Sea - International Journal of Greenhouse Gas Control, 108, 103310, https://doi.org/10.1016/j.ijggc.2021.103310.

Duke, P.J., Else, B.G.T., Jones, S.F., Marriot, S., Ahmed, M.M.M., Nandan, V., Butterworth, B., Gonski, S.F., Dewey, R., Sastri, A., Miller, L.A., Simpson, K.G., and Thomas, H. -2021- Seasonal marine carbon system processes in an Arctic coastal landfast sea ice environment observed with an innovative underwater sensor platform - Elementa: Science of the Anthropocene, 9:1, https://doi.org/10.1525/elementa.2021.00103.

Francescangeli, F., Y. Milker, D. Bunzel, H. Thomas, M. Norbisrath, J. Schönfeld, , and G. Schmiedl -2021- Recent benthic foraminiferal distribution in the Elbe Estuary (North Sea, Germany): A response to environmental stressors - Estuarine, Coastal and Shelf Science, 251, 107198, https://doi.org/10.1016/j.ecss.2021.107198.

Mears, C., H. Thomas, P.B. Henderson, M.A. Charette, H. MacIntyre, F. Dehairs, C. Monnin, and A. Mucci -2020- Using 226Ra and 228Ra isotopes to distinguish water mass distribution in the Canadian Arctic Archipelago - Biogeosciences, 17, 4937–4959, https://doi.org/10.5194/bg-17-4937-2020.

Schwichtenberg, F., J. Pätsch, M.E. Böttcher, H. Thomas, V. Winde, and K.-C. Emeis -2020- The impact of intertidal areas on the carbonate system of the southern North Sea - Biogeosciences, 17, 4223–4245, 2020, https://doi.org/10.5194/bg-17-4223-2020.

Beaupré-Laperrière, A., Mucci, A.M., and Thomas, H. -2020- The recent state and variability of the carbonate system of the Canadian Arctic Archipelago and adjacent basins in the context of ocean acidification - Biogeosciences, 17, 3923-3942, https://doi.org/10.5194/bg-17-3923-2020.

Marandino, C., E. van Doorn, N. McDonald, M. Johnson, B. Açma, E. Brévière, H. Campen, S. Carou, E. Cocco, S. Endres, N. Hilmi, F. Hopkins, P. Liss, F. Maes, M. Mårtensson, J. Oeffner, M. Oloyede, A. Peters, B. Quack, P, Singh and Thomas, H. -2020- From Monodisciplinary via Multidisciplinary to an Interdisciplinary Approach Investigating Air-Sea Interactions – a SOLAS Initiative - Coastal Management, 1-19, https://doi.org/10.1080/08920753.2020.1773208.

Delaigue, L., Mucci, A.M., and Thomas, H. -2020- Spatial variations in CO2 fluxes in the Saguenay Fjord (Quebec, Canada) and results of a water mixing model - Biogeosciences, 17, 547-566, https://doi.org/10.5194/bg-17-547-2020.

Mellon, S., Kienast, M., Algar, C., deMenocal, P., Kienast, S.S., Marchitto, T., Moros, M. and Thomas, H. -2019- Foraminifera trace anthropogenic CO 2 in the NW Atlantic by 1950 - Geophys. Research Letters, 46, https://doi.org/ 10.1029/2019GL084965.

Omar, A.M., Thomas, H., Olsen, A., Becker, M., Skjelvan, I. , and Reverdin, G. -2019- Trends of ocean acidification and pCO2 in the northern North Sea, 2003-2015 - J. Geophys. Research, Biogeosciences, 124, 3088–3103, https://doi: 10.1029/2018JG004992.

Horwitz, R.M., Hay, A.E., Burt, W.J., Cheel, R., Salisbury, J., and Thomas, H. -2019- High-frequency variability of CO2 in Grand Passage, Bay of Fundy, Nova Scotia - Biogeosciences, 16, 605-616, https://doi.org/10.5194/bg-16-605-2019.

Meyer, M., Pätsch, J., Geyer, B., and Thomas, H. -2018- Revisiting the estimate of the North Sea air‐sea flux of CO2 in 2001/02: The dominant role of different wind data products - J. Geophys. Research, Biogeosciences, 123, https://doi.org/10.1029/2017JG004281.

Lemay, J., Thomas, H., Craig, S.E., Burt, W.J., Fennel, K., and Greenan, B.J.W. -2018- Hurricane Arthur and its effect on the short-term variability of pCO2 on the Scotian Shelf, NW Atlantic - Biogeosciences, 15, 2111-2123, https://doi.org/10.5194/bg-15-2111-2018.

Geilfus, N.-X., Pind, M.L., Else, B.G.T., Galley, R.J., Miller, L.A., Thomas, H., Gosselin, M., Rysgaard, S., Wang, F., and Papakyriakou, T.N. -2018- Spatial and temporal variability of seawater pCO2 within the Canadian Arctic Archipelago and Baffin Bay during the summer and autumn 2011 - Cont. Shelf Res., in press.

Mol, J., Thomas, H., Meyers, P.G., Hu, X., and Mucci, A. -2018- Fluxes of inorganic carbon on the Canadian Beaufort Shelf - Biogeosciences, 15, 1011–1027, https://doi.org/10.5194/bg-15-1011-2018.

Burgers, T., Miller, L., Thomas, H., Else, B., Gosselin, M., and Papakyriakou, T. -2017- Surface water pCO2 variations and air-sea CO2 fluxes during summer in the eastern Canadian Arctic - J. Geophys. Research, Oceans, 122, doi.org/10.1002/2017JC013250.

Kerrigan, E.A., Kienast, M., Thomas, H., and Wallace, D.W.R. -2017- Using oxygen isotopes to establish freshwater sources in Bedford Basin, Nova Scotia, a Northwestern Atlantic fjord - Est. Coastal Shelf Science, 199, 96-104, https://doi.org/10.1016/j.ecss.2017.09.003.

Hoppe, C.L.M., Schuback, N., Semeniuk, D., Giesbrecht, K., Mol, J., Thomas, H., Maldonado, M.T., Rost, B., and, Tortell, P.D. -2018- Correction to: Resistance of Arctic phytoplankton to ocean acidification and high irradiance - Polar Biology, https://doi.org/10.1007/s00300-018-2267-8.

Hoppe, C.L.M., Schuback, N., Semeniuk, D., Giesbrecht, K., Mol, J., Thomas, H., Maldonado, M.T., Rost, B., and, Tortell, P.D. -2017- Resistance of Arctic phytoplankton to ocean acidification and high irradiance - Polar Biology, DOI 10.1007/s00300-017-2186-0.

Hussherr, R., M. Levasseur, M. Lizotte, J.-É. Tremblay, J. Mol, H. Thomas, M. Gosselin, M. Starr, L. A. Miller, T. Jarniková, N. Schuback, and A. Mucci - 2017 - Impact of ocean acidification on Arctic phytoplankton blooms and dimethylsulfide production under simulated ice-free and under-ice conditions - Biogeosciences, 14, 2407-2427, doi:10.5194/bg-14-2407-2017.

Burt, W. J., H. Thomas, L. A. Miller, M. A. Granskog, T. N. Papakyriakou, and L. Pengelly - 2016 - Inorganic Carbon Cycling and Biogeochemical Processes in an Arctic Inland Sea (Hudson Bay) - Biogeosciences, 13, 4659–4671, doi:10.5194/bg-13-4659-2016.

Charette, M.A., Lam, P.J., Lohan, M.C., Kwon, E.Y., Hatje, V., Jeandel, C., Shiller, A.M, Cutter, G.A., Thomas, A., Boyd, P.W., Homoky, W.B., Milne, A., Thomas, H., Andersson, P.S., Porcelli, D., Tanaka, T., Geibert, W., Dehairs, F., Garcia-Orellana, J. - 2016 - Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES - Philosophical Transactions A, 374, 1-19, http://dx.doi.org/10.1098/rsta.2016.007.

Turk D., J.M. Bedard, W.J. Burt, S. Vagle, H. Thomas, K. Azetsu-Scott, W.R. McGillis, S.J. Iverson, D.W.R. Wallace - 2016 - Inorganic carbon in a high latitude estuary-fjord system in Canada’s eastern Arctic - Estuarine, Coastal and Shelf Science, 178, 137-147, http://dx.doi.org/10.1016/j.ecss.2016.06.006.

Große, F., N. Greenwood, M. Kreus, H.-J. Lenhart, D. Machoczek, J. Pätsch, L.A. Salt, and H. Thomas - 2016 - Looking beyond stratification: A model-based analysis of the biological drivers of oxygen depletion in the North Sea. - Biogeosciences, 13, 2511-2535, doi:10.5194/bg-13-2511-2016.

Burt, W. J., H. Thomas, M. Hagens, J. Pätsch, N. M. Clargo, L. Salt, V. Winde, and M. E. Boettcher - 2016 - Carbon Sources in the North Sea Evaluated by means of Radium and Stable Carbon Isotope Tracers - Limnology and Oceanography, 61, 666-683, doi:10.1002/lno.10243.

Thomas, H., J. Pätsch, I. Lorkowski, L. Salt, W. Kühn, and J. Huthnance - 2016 - CO2, pH, nutrients. -In: Markus Quante, Franciscus Colijn (eds.), North Sea Region Climate Change Assessment (NOSCCA), Springer, Berlin Heidelberg, Regional Climate Studies, chapter 2.2.6., DOI 10.1007/978-3-319-39745-0.

Salt, L. A., H. Thomas, Y. Bozec, A.V. Borges and H. J. W. deBaar - 2016 - The internal consistency of the North Sea carbonate system. - J. Marine Systems, 157, 52-64, http://dx.doi.org/10.1016/j.jmarsys.2015.11.008.

Clargo, N. M., L. A. Salt, H. Thomas, and H. J. W. deBaar - 2015 - Rapid increase of observed DIC and pCO2 in the surface waters of the North Sea in the 2001-2011 decade ascribed to climate change superimposed by biological processes. - Marine Chemistry, 177, 566-581, http://dx.doi.org/10.1016/j.marchem.2015.08.010.

Jiao, N., Legendre, L., Robinson, C., Thomas, H., Luo, Y., Dang, H., Liu, J., Zhang, R., Tang, K., Luo, T., Li, C., Wang, X., Zhang, C. - 2015 - Comment on “Dilution limits dissolved organic carbon utilization in the deep ocean" - Science, 350 (6267), p1483a, http://dx.doi.org/10.1126/science.aab2713.

Glavovic, B. C., K. Limburg, K.-K. Liu, K.-C. Emeis, H. Thomas, H. Kremer, B. Avril, J. Zhang, M. R. Mulholland, M. Glaser, and D. P. Swaney - 2015 - Living on the Margin in the Anthropocene: Engagement arenas for sustainability research and action at the ocean-land interface. - Current Opinion in Environmental Sustainability, 14, 232–238, http://dx.doi.org/10.1016/j.cosust.2015.06.003.

Gledhill, D. K., White, M. M., Salisbury, J., Thomas, H., Mlsna, I., Liebman, M., Mook, B., Grear, J., Candelmo, A. C., Chambers, R. C., Gobler, C. J., Hunt, C. W., King, A. L., Price, N. N., Signorini, S., Stancioff, E., Stymiest, C., Wahle, R. A., Waller, J. D., Rebuck, N. D., Wang, Z. A., Capson, T. L., Morrison, J. R., Cooley, S., and Doney, S. C. - 2015 - Ocean and Coastal Acidification off New England and Nova Scotia. - Oceanography, 28(2):182–197, http://dx.doi.org/10.5670/oceanog.2015.41; Electronic supplements.

Craig, S. E., Thomas, H., Jones, C. T., Li, W. K. W., Greenan, B. J. W., Shadwick, E. H., and Burt, W. J. - 2015 - The effect of seasonality in phytoplankton community composition on CO2 uptake on the Scotian Shelf - J. Marine Systems 147, 52-60, http://dx.doi.org/10.1016/j.jmarsys.2014.07.006.

Emeis, K. C., van Beusekom, J. E., Callies, U., Ebinghaus, R., Kannen, A., Kraus, G., Kroencke, I., Lenhart, H., Lorkowski, I., Matthias, V., Moellmann, C., Paetsch, J., Scharfe, M., Thomas, H., Weisse, R., and Zorita, E. - 2015 - The North Sea – a shelf sea in the anthropocene - J. Marine Systems 141, 18-33, http://dx.doi.org/10.1016/j.jmarsys.2014.03.012.

Burt, W. J., H. Thomas, J. Pätsch, A. M. Omar, C. Schrum, U. Daewel, H. Brenner, and H. J. W. de Baar - 2014 - Radium isotopes as a tracer of sediment-water column exchange in the North Sea - Global Biogeochemical Cycles, 28, DOI:10.1002/2014GB004825.

Jiao, N., C. Robinson, F. Azam, H. Thomas, F. Baltar, H. Dang, N. J. Hardman-Mountford, M. Johnson, D. L. Kirchman, B. P. Koch, Legendre, C. Li, J. Liu, T. Luo, Y.-W. Luo, A. Mitra, A. Romanou, K. Tang, X. Wang, C. Zhang, and R. Zhang - 2014 - Mechanisms of microbial carbon sequestration in the ocean – future research directions - Biogeosciences 11, 5285–5306, doi:10.5194/bg-11-5285-2014.

Jiang, Z.-P., Hydes, D. J., Hartman, S. E., Hartman, M. C., Campbell, J. M., Johnson, B. D., Schofield, B., Turk, D., Wallace, D., Burt, W., Thomas, H., Cosca, C., and Feely, R. - 2014 - Application and assessment of a membrane-based pCO2 sensor under field and laboratory conditions - Limnol. Oceanogr. Methods 12, 264-280.

Shadwick, E. H., and Thomas, H. - 2014 - Seasonal and spatial variability in the CO2 system on the Scotian Shelf (Northwest Atlantic) - Marine Chemistry, 160, 42-55, doi:10.1016/j.marchem.2014.01.009.

Fransson, A., Chierici, M., Miller, L. A., Carnat, G., Shadwick, E. H., Thomas, H., Pineault, S., and Papakyriakou, T. N. -2013- Impact of sea-ice processes on the carbonate system and ocean acidification at the ice-water interface of the Amundsen Gulf, Arctic Ocean - J. Geophys. Research, Oceans, 118, 1-23, doi:10.1002/2013JC009164.

Salt, L., Thomas, H., Prowe, A. E. F., Borges, A. V., and deBaar, H. J. W. -2013- Variability of shelf sea pH and CO2 pumping in response to NAO forcing - J. Geophys. Research, Biogeosciences, 118, 1-9, doi:10.1002/2013JG002306.

Signorini, S. R., Mannino, A., Friedrichs, M., Najjar, R. G., Cai, W.-J., Salisbury, J., Zhang, Z. A., Thomas, H., and Shadwick, E.H. - 2013 - Surface Ocean pCO2 Seasonality and Sea-Air CO2 Flux Estimates for the North American East Coast - J. Geophys. Research, Oceans, 118, 1-22, doi:10.1002/jgrc.20369.

Shadwick, E. H., Trull, T. W., Thomas, H., and Gibson, J. - 2013 - Vulnerability of Polar Oceans to Anthropogenic Acidification: Comparison of Arctic and Antarctic Seasonal Cycles - Nature Scientific Reports, 3:2339, doi:10.1038/srep02339.

Burt, W., Thomas, H., and Auclair, J.-P. - 2013 - Short-lived radium isotopes on the Scotian Shelf: Unique distribution and tracers of cross-shelf CO2 and nutrient transport - Marine Chemistry, 156, 120-129, doi:10.1016/j.marchem.2013.05.007.

Burt, W., Thomas, H., Fennel, K., and E. Horne - 2013 - Sediment-water column fluxes of carbon, oxygen and nutrients in Bedford Basin, Nova Scotia, inferred from 224Ra measurments - Biogeosciences, 10, 53-66, doi:10.5194/bg-10-53-2013.

Pineault, S., Tremblay, J.-É., Gosselin, M., Thomas, H., and Shadwick, E.H. - 2013 - The isotopic signature of particulate organic C and N in bottom ice: controlling factors and applications for tracing the fate of ice-algae in the Arctic Ocean - J. Geophys. Research, Oceans, 118, 33. doi:10.1029/2012JC008331.

Bundy, A., Liu, K.-K., and Thomas, H. - 2013 - The Future of Marine Biogeochemistry, Ecosystems, and Societies - EOS, 94, Vol. 20, p184.

Thomas, H., Craig, S., Greenan, B., Burt, W., Herndl, G., Higginson, S., Salt, L., Shadwick, E.H., Urrego Blanco, J. - 2012 - Direct observations of diel biological CO2 fixation on the Scotian Shelf, Northwestern Atlantic Ocean - Biogeosciences, 9, 2301-2309, doi:10.5194/bg-9-23-1-2012.

Else, B., Papakyriakou, T.N., Galley, R.J., Mucci, A., Gosselin, L.A., Shadwick, E.H., and Thomas, H. - 2012 - Annual Cycles of pCO2sw in the Southeastern Beaufort Sea: New understandings of air-sea CO2 exchange in Arctic polynya regions. - J. Geophys. Research, Oceans, 117, doi:10.1029/2011JC0073462.

Elkalay, K., Khalil, K., Thomas, H., Bozec, Y., Ruardij, P., and de Baar, H.J.W. - 2012 - Biogeochemical 1D ERSEM Ecosystem Model Applied to Recent Carbon Dioxide and Nutrient Data in the North Sea - Models of the Ecological Hierarchy, Developments in Environmental Modelling, 25, Elsevier http://dx.doi.org/10.1016/B978-0-444-59396-2.00017-1 p275-294.

Artioli, Y., Blackford, J.C., Butenschön, M., Holt, J.T., Wakelin, S.L., Thomas. H., Borges, A.V., and Allen, J.I. - 2012 - The carbonate system in the North Sea: Sensitivity and model validation - J. Marine Systems, 102-104, 1-13, doi:10.1016/j.jmarsys.2012.04.006.

Thomas, H. and Borges, A.V. - 2012 - Biogeochemistry of coastal seas and continental shelves - including biogeochemistry of during the International Polar Year - Est. Coast. Shelf Science, 100, 1-2.

Geilfus, N.-X., G. Carnat, T. Papakyriakou, J.-L. Tison, B. Else, H. Thomas, E.H. Shadwick and B. Delille - 2012 - pCO2 dynamics and related air-ice CO2 fluxes in the Arctic coastal zone (Amundsen Gulf, Beaufort Sea) - J. Geophys. Research, Oceans, 117, C00G10, doi:10.1029/2011JC007118.

Chierici, M., A. Fransson, B. Lansard, L. Miller, A. Mucci, E.H. Shadwick, H. Thomas, J.-E. Tremblay, and T. Papakyriakou - 2011 - The impact of biogeochemical processes and environmental factors on the calcium carbonate saturation state in the Circumpolar Flaw Lead in the Amundsen Gulf, Arctic Ocean - J. Geophys. Research, Oceans, 116, C00G09, doi:10.1029/2011JC007184.

Thomas, H., Shadwick, E.H., Dehairs, F., Lansard, B., Mucci, A., Navez, J., Gratton, Y., Prowe, A.E.F., , Chierici, M., Fransson, A., Papakyriakou, T.N., Sternberg, E., Miller, L., Tremblay, J.-É., and Monnin, C. - 2011 - Barium and Carbon fluxes in the Canadian Arctic Archipelago - J. Geophys. Research, Oceans, 116, C00G08, doi:10.1029/2011JC007120.

Else, B., T. Papakyriakou, R. Galley, W. Drennan, L. Miller, and H. Thomas - 2011 - Wintertime CO2 Fluxes in an Arctic Polynya Using Eddy Covariance: Evidence for Enhanced Air-Sea Gas Transfer During Ice Formation - J. Geophys. Research, Oceans, 116, C00G03, doi:10.1029/2010JC006760.

Forest, A., Tremblay, J., Gratton, Y., Martin, J., Gagnon, J., Darnis, G., Sampei, M., Fortier, L., Ardyna, M., Gosselin, M., Hattori, H., Nguyen, D., Maranger, R., Vaqué, D., Marrasé, C., Pedrós- Alió, C., Sallon, A., Michel, C., Kellogg, C., Deming, J., Shadwick, E., Thomas, H., Link, H., Archambault, P., and Piepenburg, D. - 2011 - Biogenic carbon flows through the planktonic food web of the Amundsen Gulf (Arctic Ocean): A synthesis of field measurements and inverse modeling analyses - Prog. Oceanography, 91, 410–436, doi: 10.1016/j.pocean.2011.05.002.

De Baar, H. J. W., H. A. J. Meijer, H. Thomas, P. Ruardij, T. Johannesen, H. J. Zemmelink, A. M. Omar, I. T. van der Laan-Luijkx, L. Salt, K. Elkalay, Y. Bozec, and A. Prowe - 2011 - Uptake of CO2 by the North Sea in interaction with plankton blooms - in: Aspects of coastal research in contribution to LOICZ in the Netherlands and Flanders (2002-2010), C. Heip, and Laane, R. (eds.), LOICZ Research & Studies, 38, Helmholtz-Zentrum Geesthacht, Germany, 94-107.

Shadwick, E.H., and Thomas, H. - 2011 - Carbon Dioxide in the Coastal Ocean: A Case Study in the Scotian Shelf Region - in: Ocean Year Book, 25, A. Chircop, S. Coffen-Smout, and M. McConnell, M. (eds.), Martinus Nijhoff, Leiden/Boston, 171-204.

Shadwick, E.H., Thomas, H., Gratton, Y., Leong, D., Moore, S., Papakyriakou, T.N., and Prowe, F. - 2011 - Export of Pacific carbon through the Arctic Archipelago to the North Atlantic - Cont. Shelf. Res., 31, 806–816, doi:10.1016/j.csr.2011.01.014.

Shadwick, E.H., Thomas, H., Azetsu-Scott, K., Greenan, B. J. W., Head, E and Horne, E. - 2011 - Seasonal variability of dissolved inorganic carbon and surface water pCO2 in the Scotian Shelf region of the Northwestern Atlantic - Marine Chemistry, 124, 23–37, doi:10.1016/j.marchem.2010.11.004.

Shadwick, E.H., Thomas, H., Chierici, M., Else, B., Fransson, A., Michel, C., Miller, L.A., Mucci, A., Niemi, A., Papakyriakou, T.N. and Tremblay, J.-É - 2011 - Seasonal Variability of the Inorganic Carbon System in the Amundsen Gulf Region of the Southeastern Beaufort Sea - Limnology and Oceanography, 56(1), 303-322, doi:10.4319/lo.2011.56.1.0303.

Shadwick, E.H., H. Thomas, A. Comeau, S.E. Craig, C.W. Hunt and J.E. Salisbury - 2010 - Air-Sea CO2 fluxes on the Scotian Shelf: Seasonal to multi-annual variability - Biogeosciences, 7, 3851-3867, doi:10.5194/bg-7-3851-2010.

Thomas, H., J. Pempkowiak, F. Wulff and K. Nagel - 2010 - Carbon and nutrient budgets of the Baltic Sea - In: K.-K. Liu, L.Atkinson,, R. Quinones, L. Talaue-McManus (eds.) - Carbon and nutrient fluxes in global continental margins, Springer, Berlin Heidelberg, 334-346.

Thomas, H., Y. Bozec, H.J.W. deBaar, K. Elkalay, M. Frankignoulle, W. Kühn, H.J. Lenhart, A. Moll, J. Pätsch, G. Radach, L.-S. Schiettecatte and A. Borges - 2010 - Carbon and nutrient budgets of the North Sea - In: K.-K. Liu, L.Atkinson,, R. Quinones, L. Talaue-McManus (eds.) - Carbon and nutrient fluxes in global continental margins, Springer, Berlin Heidelberg, 346-355.

Omar, A.M., A. Olsen, T. Johannessen, M. Hoppema, H. Thomas, and A.V. Borges - 2010 - Spatiotemporal variations of fCO2 in the North Sea - Ocean Science, 6, 77-89.

Kühn, W., J. Pätsch, H. Thomas, A.V. Borges, L.-S. Schiettecatte, Y. Bozec, and A.E.F. Prowe - 2010 - Nitrogen and carbon cycling in the North Sea and exchange with the North Atlantic - A model study, Part II: Carbon budget and fluxes - Continental Shelf Research, 30, 1701-1716, doi:10.1016/j.csr.2010.07.001.

Prowe, A.E.F., H. Thomas, J. Pätsch, W. Kühn, Y. Bozec, L.-S. Schiettecatte, A.V. Borges, and H.J.W. de Baar - 2009 - Mechanisms controlling the air-sea CO2 flux in the North Sea - Continental Shelf Research, 29, 1801-1808, doi:10.1016/j.csr.2009.06.003.

Thomas, H., L.-S. Schiettecatte, K. Suykens, Y.J.M. Koné, E.H. Shadwick, A.E.F. Prowe, Y. Bozec, H.J.W. de Baar, and A.V. Borges - 2009 - Enhanced ocean carbon storage from anaerobic alkalinity generation in coastal sediments - Biogeosciences, 6, 267-274.

Thomas, H., D. Unger, J. Zhang, K.K. Liu and E.H. Shadwick - 2008 - Biogeochemical cycling in semi-enclosed marine systems and continental margins - In: Urban E., Sundby B., Malanotte-Rizzoli, P. and  Melillo, J. (eds) Watersheds, Bays and Bounded Seas (SCOPE No. 70). Island Press, Washington, D. C., 169-190.

MacCracken, M., E. Escobar Briones, D. Gilbert, G. Korotaev, W. Naqvi, G. Perillo, T. Rixen, E. Stanev, H. Thomas, D. Unger and E. Urban - 2008 - Vulnerability of Semi-Enclosed Marine Systems to Environmental Disturbances - In: Urban E., Sundby B., Malanotte-Rizzoli, P. and  Melillo, J. (eds) Watersheds, Bays and Bounded Seas (SCOPE No. 70). Island Press, Washington, D. C., 9-30.

Thomas, H., A.E.F. Prowe, I.D. Lima, S.C. Doney, R. Wanninkhof, R.J. Greatbatch, U. Schuster, and A. Corbière - 2008 - Changes in the North Atlantic Oscillation influence CO2 uptake in the North Atlantic over the past 2 decades - Global Biogeochemical Cycles, 22, GB4027, doi:10.1029/2007GB003167.

Thomas, H., A.E.F. Prowe, I.D. Lima, S.C. Doney, R. Wanninkhof, R.J. Greatbatch, U. Schuster, and A. Corbière - 2008 - Changes in the North Atlantic Oscillation influence CO2 uptake in the North Atlantic over the past 2 decades - Global Biogeochemical Cycles, 22, GB4027, doi:10.1029/2007GB003167, supplement.

Hoppema, M., R. Middag, H.J.W. de Baar, E. Fahrbach, E.M. van Weerlee, and H. Thomas - 2007 - Whole season net community production in the Weddell Sea - Polar Biol., doi:10.1007/s00300-007-0336-5.

Schiettecatte, L.-S., H. Thomas, Y. Bozec, and A.V. Borges - 2007 - High temporal coverage of carbon dioxide measurements in the Southern Bight of the North Sea - Marine Chemistry, 106, 161-173, doi:10.1016/j.marchem.2007.01.001.

Thomas, H., A.E.F. Prowe, S. van Heuven, Y. Bozec, H.J.W. de Baar, L.-S. Schiettecatte, K. Suykens, M. Koné, A.V. Borges, I.D. Lima, and S.C. Doney - 2007 - Rapid decline of the CO2 buffering capacity in the North Sea and implications for the North Atlantic Ocean - Global Biogeochemical Cycles, 21, GB4001, doi:10.1029/2006GB002825.

Schiebel, R., S. Barker, R. Lendt, H. Thomas, and J. Bollmann - 2007 - Planktic foraminiferal dissolution in the twilight zone - Deep-Sea Research II, 54, 676-686, doi:10.1016/j.dsr2.2007.01.009.

Bozec, Y., Thomas, H., Schiettecatte, L.S., Borges, A. Elkalay, K., de Baar, H.J.W. - 2006 - Assessment of the processes controlling seasonal variations of dissolved inorganic carbon in the North Sea. - Limnol. Oceanogr., 51(6), 2006, 2746-2762.

Thomas, H., Bozec, Y., de Baar, H.J.W. , Elkalay, K., Frankignoulle, M., Schiettecatte, L.-S., Kattner, G., and Borges, A.V. - 2005 - The Carbon budget of the North Sea. - Biogeosciences, 2, 87-96.

Bozec, Y., Thomas, H., Elkalay, K. and de Baar, H.J.W. - 2005 - The continental shelf pump in the North Sea - evidence from summer observations. - Marine Chemistry, 93, 131-147, doi:10.1016/j.marchem.2004.07.006.

Bozec, Y., Bakker, D.C.E., Hartmann, C., Thomas, H., Bellerby, R.G.J., Nightingale, P.D., Riebesell, U., Watson, A.J., de Baar, H.J.W. - 2005 - The CO2 system in a Redfield context during an iron enrichment experiment in the Southern Ocean. - Marine Chemistry, 95, 89-105, doi:10.1016/j.marchem.2004.08.004.

Thomas, H., Bozec, Y., Elkalay, K., deBaar, H.J.W. ,Borges, A.V. and Schiettecatte, L.-S. - 2005 - Controls of the surface water partial pressure of CO2 in the North Sea. - Biogeosciences, 2, 323-334.

Ito, R.G.,Schneider, B., and Thomas, H. - 2005 - Seasonal variations of fCO2 in seawater of the southwestern subtropical Atlantic and adjacent continental shelf. - J. Mar. Sys., 56, 227-242.

Thomas, H., Bozec, Y., Elkalay, K., and de Baar, H.J.W. - 2004 - Response to Comment on "Enhanced open ocean storage of CO2 from shelf sea pumping". - Science, 306, 5701, 1477, doi:10.1126/science.1103193.

Thomas, H., Bozec, Y., Elkalay, K., and de Baar, H.J.W. - 2004 - Enhanced open ocean storage of CO2 from shelf sea pumping. - Science, 304, 5673, 1005-1008, doi:10.1126/science.1095491.

Thomas, H., Pempkowiak, J., Wulff, F., and Nagel, K. - 2003 - Autotrophy, nitrogen accumulation and nitrogen limitation in the Baltic Sea: a paradox or a buffer for eutrophication? - Geophys. Res. Letters, 30 No. 21, 2130, doi:10.1029/2003GL017937.

Lendt, R., Thomas, H., Hupe, A., and Ittekkot, V. - 2003 - The response of the near surface carbonate system of the northwestern Arabian Sea to the SW monsoon and related biological forcing. - J. of Geophys. Res., Vol. 108, No. C7, 3222, doi:10.1029/2000JC000771.

Thomas, H. - 2002 - Remineralisation Ratios of Carbon, Nutrients and Oxygen in the North Atlantic Ocean - a field data based assessment. - Global Biogeochemical Cycles, 16, doi:10.1029/2001GB001452.

Thomas, H., and England, M.H. - 2002 - Different oceanic features of anthropogenic CO2 and CFCs. - Naturwissenschaften, 89, 399-403, doi:10.1007/s00114-002-0348-5.

Stoll, M.H.C., Thomas, H., de Baar, H.J.W., Zondervan, I., de Jong, E., Bathmann, U.V., and Fahrbach, E. - 2002 - Carbon dioxide uptake and release by phytoplankton blooms at the Antartic Marginal Ice Zone. - Deep-Sea Research I, Vol. 49(9), 1651-1667.

Thomas, H., England, M.H., and Ittekkot, V. - 2001 - An off-line 3D model of antropogenic CO2 uptake by the oceans. - Geophys. Res. Letters, 28 No. 3, 547-550.

Thomas, H., and Ittekkot, V. - 2001 - Determination of anthropogenic CO2 in the North Atlantic Ocean using water mass ages and CO2 equilibrium chemistry. - J. Mar. Sys., 27, 325-336.

Hupe, A., Thomas, H., Ittekkot, V. and Lendt, R. - 2001 - Inventory of released inorganic carbon from organic matter remineralization in the deeper Arabian sea. - J. of Geophys. Res., 106/12, 31,189 - 31,196.

Osterroht, C., and Thomas, H. - 2000 - New production enhanced by nutrient supply from non-Redfield remineralisation of freshly produced organic material. - J. Mar. Sys., 25, 33-46.

Thomas, H., Ittekkot, V., Osterroht, C., and Schneider, B. - 1999 - Preferential recycling of nutrients - the ocean's way to increase new production and to pass nutrient limitation? - Limnol. and Oceanogr., Vol. 44, No. 8, 1999-2004.

Thomas, H. and Schneider, B. - 1999 - The seasonal cycle of carbon dioxide in Baltic Sea surface waters. - J. of Mar. Sys., 22, 53-67.

Körtzinger, A., Thomas, H., Schneider, B., Gronau, N., Mintrop, L. and Duinker, J.C. - 1996 - At sea intercomparison of two newly designed underway pCO2 systems - encouraging results - Marine Chemistry, 52, 133-145.