Helmuth Thomas

Professor
Canada Research Chair, Tier II: Marine Biogeochemistry

Email: helmuth.thomas@dal.ca

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Recent Submissions

  • Preferential recycling of nutrients - the ocean's way to increase new production and to pass nutrient limitation? 

    Thomas, H., V. Ittekkot, C. Osterroht, and B. Schneider. 1999. "Preferential recycling of nutrients - the ocean's way to increase new production and to pass nutrient limitation?." Limnology and Oceanography 44(8): 1999-2004.
    Uptake of atmospheric CO2 by the oceans and the export of carbon into deeper waters via the biological CO2 pump is driven by the production of particulate organic matter (POM). The elemental ratios of carbon, nitrogen, and ...
  • Sediment-water column fluxes of carbon, oxygen and nutrients in Bedford Basin, Nova Scotia, inferred from Ra-224 measurements 

    Burt, W. J., H. Thomas, K. Fennel, and E. Horne. 2013. "Sediment-water column fluxes of carbon, oxygen and nutrients in Bedford Basin, Nova Scotia, inferred from Ra-224 measurements." Biogeosciences 10(1): 53-66.
    Exchanges between sediment pore waters and the overlying water column play a significant role in the chemical budgets of many important chemical constituents. Direct quantification of such benthic fluxes requires explicit ...
  • Enhanced ocean carbon storage from anaerobic alkalinity generation in coastal sediments 

    Thomas, H., L-S Schiettecatte, K. Suykens, YJ M Kone, et al. 2008. "Enhanced ocean carbon storage from anaerobic alkalinity generation in coastal sediments." Biogeosciences Discussions 5(4): 3575-3591.
    The coastal ocean constitutes the crucial link between land, the open ocean and the atmosphere. Furthermore, its shallow water column permits close interactions between the sedimentary and atmospheric compartments, which ...
  • Carbon cycling in the Arctic Archipelago: the export of Pacific carbon to the North Atlantic 

    Shadwick, E. H., T. Papakyriakou, AEF Prowe, D. Leong, et al. 2009. "Carbon cycling in the Arctic Archipelago: the export of Pacific carbon to the North Atlantic." Biogeosciences Discussions 6(1): 971-994.
    The Arctic Ocean is expected to be disproportionately sensitive to climatic changes, and is thought to be an area where such changes might be detected. The Arctic hydrological cycle is influenced by: runoff and precipitation, ...
  • Seasonal variability of the inorganic carbon system in the Amundsen Gulf region of the southeastern Beaufort Sea 

    Shadwick, E. H., H. Thomas, M. Chierici, B. Else, et al. 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.
    During a year-round occupation of Amundsen Gulf in the Canadian Arctic Archipelago dissolved inorganic and organic carbon (DIC, DOC), total alkalinity (TA), partial pressure of CO(2) (pCO(2)) and related parameters were ...
  • Controls of the surface water partial pressure of CO2 in the North Sea 

    Thomas, H., Y. Bozec, K. Elkalay, HJW de Baar, et al. 2005. "Controls of the surface water partial pressure of CO2 in the North Sea." Biogeosciences 2(4): 323-334.
    The seasonal variability of the partial pressure of CO2 (pCO(2)) has been investigated in the North Sea, a northwest European shelf sea. Based on a seasonal and high spatial resolution data set the main controlling factors ...
  • Air-Sea CO2 fluxes on the Scotian Shelf: seasonal to multi-annual variability 

    Shadwick, E. H., H. Thomas, A. Comeau, S. E. Craig, et al. 2010. "Air-Sea CO2 fluxes on the Scotian Shelf: seasonal to multi-annual variability." Biogeosciences 7(11): 3851-3867.
    We develop an algorithm to compute pCO(2) in the Scotian Shelf region (NW Atlantic) from satellite-based estimates of chlorophyll-a concentration, sea-surface temperature, and observed wind speed. This algorithm is based ...
  • Assessment of the processes controlling seasonal variations of dissolved inorganic carbon in the North Sea 

    Bozec, Yann, Helmuth Thomas, Laure-Sophie Schiettecatte, Alberto V. Borges, et al. 2006. "Assessment of the processes controlling seasonal variations of dissolved inorganic carbon in the North Sea." Limnology and Oceanography 51(6): 2746-2762.
    We used a seasonal North Sea data set comprising dissolved inorganic carbon (DIC), partial pressure of CO2 (pCO(2)), and inorganic nutrients to assess the abiotic and biological processes governing the monthly variations ...
  • Satellite observations reveal high variability and a decreasing trend in CO sub(2) fluxes on the Scotian Shelf 

    Shadwick, E. H., H. Thomas, A. Comeau, SE Craig, et al. 2010. "Satellite observations reveal high variability and a decreasing trend in CO sub(2) fluxes on the Scotian Shelf." Biogeosciences Discussions 7(4): 5269-5304.
    We develop an algorithm to compute pCO sub(2) in the Scotian Shelf region (NW Atlantic) from satellite-based estimates of chlorophyll-a concentration, sea-surface temperature, and observed wind speed. This algorithm is ...
  • Direct observations of diel biological CO2 fixation on the Scotian Shelf, northwestern Atlantic Ocean 

    Thomas, H., S. E. Craig, B. J. W. Greenan, W. Burt, et al. 2012. "Direct observations of diel biological CO2 fixation on the Scotian Shelf, northwestern Atlantic Ocean." Biogeosciences 9(6): 2301-2309.
    Much of the variability in the surface ocean's carbon cycle can be attributed to the availability of sunlight, triggering surface heat flux and photosynthesis, which in turn regulate the biogeochemical cycling of carbon ...
  • The carbon budget of the North Sea 

    Thomas, H., Y. Bozec, HJW de Baar, K. Elkalay, et al. 2005. "The carbon budget of the North Sea." Biogeosciences 2(1): 87-96.
    A carbon budget has been established for the North Sea, a shelf sea on the NW European continental shelf. The carbon exchange fluxes with the North Atlantic Ocean dominate the gross carbon budget. The net carbon budget ...
  • Spatiotemporal variations of fCO(2) in the North Sea 

    Omar, A. M., A. Olsen, T. Johannessen, M. Hoppema, et al. 2010. "Spatiotemporal variations of fCO(2) in the North Sea." Ocean Science 6(1): 77-89.
    Data from two Voluntary Observing Ship (VOS) (2005-2007) augmented with data subsets from ten cruises (1987-2005) were used to investigate the spatiotemporal variations of the CO2 fugacity in seawater (fCO(2)(sw)) in the ...