Dr Sinhue Torres-Valdes

Ocean Biogeochemistry and Ecosystems
+44 (0)23 8059 9237

Nutrient Biogeochemistry

Primary production in the ocean, and hence export production (the biological carbon pump), is limited by the availability of light and nutrients. Nutrients are compounds present in seawater that contain elements that are essential for life; for example nitrogen, phosphorus, silicon and carbon. It is therefore important to understand how these compounds are transported, distributed and utilised in the ocean. 

Studying nutrients in the ocean requires multidisciplinary work, since the concentration of nutrients in seawater at a given point in the ocean results from the interaction of physical and biologically mediated chemical processes. Ocean currents, eddies, upwelling, and mixing are physical processes that move nutrients around in the ocean. Simultaneously, there are microorganisms (e.g., phytoplankton and bacteria) modifying the concentration of nutrients by using them for growth, transforming them and using them again (a process that we call nutrient biogeochemical cycling). 

In addition to their biogeochemical function, nutrient concentrations in the ocean can be extremely useful, since water masses may have unique characteristic chemical properties. Thus, such characteristics can be used to trace the movement and modification of water masses in the ocean.  

The research I am involved with requires close collaboration with physical oceanographers, modellers and biological oceanographers. It is by joining efforts that we can achieve a comprehensive understanding of biogeochemical cycling in the ocean and its impact on the planet's climate.

My main interest include cycling and transports of dissolved inorganic nutrients and dissolved organic nutrients in the ocean, and the use of nutrient concentrations to trace water masses. I am particularly interested in Nutrient Biogeochemistry of Polar Oceans, and of these, the Arctic Ocean.    





Benetti, M.; Reverdin, G.; Lique, C.; Yashayaev, I.; Holliday, N.P.; Tynan, E.; Torres-valdes, S.; Lherminier, P.; Tréguer, P.; Sarthou, G.. 2017 Composition of freshwater in the spring of 2014 on the southern Labrador shelf and slope. Journal of Geophysical Research: Oceans, Early View. 10.1002/2016JC012244 (In Press)
Torres-valdes, Sinhue; Tsubouchi, Takamasa; Davey, Emily; Yashayaev, Igor; Bacon, Sheldon. 2016 Relevance of dissolved organic nutrients for the Arctic Ocean nutrient budget. Geophysical Research Letters, 43 (12). 6418-6426.10.1002/2016GL069245
Sanders, R.; Henson, S.A.; Martin, A.P.; Anderson, T.R.; Bernardello, R.; Enderlein, P.; Fielding, S.; Giering, S.; Hartmann, M.; Iversen, M.; Khatiwala, S.; Lam, P.; Mayor, D.J.; Moore, C.M.; Murphy, E.; Painter, S.C.; Poulton, A.J.; Saw, K.; Stowasser, G.; Tarling, G.A.; Torres-valdes, S.; Trimmer, M.; Wolff, G.A.; Yool, A.. 2016 Controls over Ocean Mesopelagic Interior Carbon Storage (COMICS): fieldwork, synthesis and modelling efforts. Frontiers in Marine Science, 3, 136. 7, pp.10.3389/fmars.2016.00136
Loose, Brice; Jenkins, William J.; Moriarty, Roisin; Brown, Peter; Jullion, Loic; Naveira Garabato, Alberto C.; Torres-valdes, Sinhue; Hoppema, Mario; Ballentine, Chris; Meredith, Michael P.. 2016 Estimating the recharge properties of the deep ocean using noble gases and helium isotopes. Journal of Geophysical Research: Oceans, 121 (8). 5959-5979.10.1002/2016JC011809
Brown, Peter; Jullion, Loïc; Landschützer, Peter; Bakker, Dorothee C. E.; Naveira Garabato, Alberto C.; Meredith, Michael P.; Torres-valdes, Sinhue; Watson, Andrew; Hoppema, Mario; Loose, Brice; Jones, Elizabeth M.; Telszewski, Maciej; Jones, Steve D.; Wanninkhof, Rik. 2015 Carbon dynamics of the Weddell Gyre, Southern Ocean. Global Biogeochemical Cycles, 29 (3). 288-306.10.1002/2014GB005006
Bauch, D.; Torres-valdes, S.; Polyakov, I.; Novikhin, A.; Dmitrenko, I.; McKay, J.; Mix, A.. 2014 Halocline water modification and along-slope advection at the Laptev Sea continental margin. Ocean Science, 10 (1). 141-154.10.5194/os-10-141-2014
Painter, S.C.; Patey, M.D.; Tarran, G.A.; Torres-valdes, S.. 2014 Picoeukaryote distribution in relation to nitrate uptake in the oceanic nitracline. Aquatic Microbial Ecology, 72 (3). 195-213.10.3354/ame01695
MacGilchrist, G.A.; Naveira Garabato, A.; Tsubouchi, T.; Bacon, S.; Torres-valdes, S.; Azetsu-Scott, K.. 2014 The Arctic Ocean carbon sink. Deep Sea Research Part I: Oceanographic Research Papers, 86. 39-55.10.1016/j.dsr.2014.01.002
Torres-Valdés, S.; Painter, S.C.; Martin, A.P.; Sanders, R.; Felden, J.. 2014 Data compilation of fluxes of sedimenting material from sediment traps in the Atlantic Ocean. Earth System Science Data, 6 (1). 123-145.10.5194/essd-6-123-2014
Jullion, Loïc; Naveira Garabato, Alberto C.; Bacon, Sheldon; Meredith, Michael P.; Brown, Pete J.; Torres-valdes, Sinhue; Speer, Kevin G.; Holland, Paul R.; Dong, Jun; Bakker, Dorothée; Hoppema, Mario; Loose, Brice; Venables, Hugh J.; Jenkins, William J.; Messias, Marie-José; Fahrbach, Eberhard. 2014 The contribution of the Weddell Gyre to the lower limb of the global overturning circulation. Journal of Geophysical Research: Oceans, 119 (6). 3357-3377.10.1002/2013JC009725
Brown, Peter J.; Meredith, Michael P.; Jullion, Loic; Naveira Garabato, Alberto; Torres-Valdes, Sinhue; Holland, Paul; Leng, Melanie J.; Venables, Hugh. 2014 Freshwater fluxes in the Weddell Gyre: results from ?18O. Philosophical Transactions of the Royal Society of London, A, 372 (2019), 20130298. 10.1098/rsta.2013.0298
Painter, Stuart C.; Patey, Matthew D.; Forryan, Alexander; Torres-Valdes, Sinhue. 2013 Evaluating the balance between vertical diffusive nitrate supply and nitrogen fixation with reference to nitrate uptake in the eastern subtropical North Atlantic Ocean. Journal of Geophysical Research: Oceans, 118 (10). 5732-5749.10.1002/jgrc.20416
Torres-valdes, Sinhué; Tsubouchi, Takamasa; Bacon, Sheldon; Naveira-Garabato, Alberto C.; Sanders, Richard; McLaughlin, Fiona A.; Petrie, Brian; Kattner, Gerhard; Azetsu-Scott, Kumiko; Whitledge, Terry E.. 2013 Export of nutrients from the Arctic Ocean. Journal of Geophysical Research: Oceans, 118 (4). 1625-1644.10.1002/jgrc.20063
Dmitrenko, Igor A.; Ivanov, Vladimir V.; Kirillov, Sergey A.; Vinogradova, Elena L.; Torres-Valdes, Sinhue; Bauch, Dorothea. 2011 Properties of the Atlantic derived halocline waters over the Laptev Sea continental margin: Evidence from 2002 to 2009. Journal of Geophysical Research, 116 (C10). C10024.10.1029/2011JC007269
Williams, Richard G.; McDonagh, Elaine; Roussenov, Vassil M.; Torres-Valdes, Sinhue; King, Brian; Sanders, Richard; Hansell, Dennis A.. 2011 Nutrient streams in the North Atlantic: Advective pathways of inorganic and dissolved organic nutrients. Global Biogeochemical Cycles, 25 (4). GB4008.10.1029/2010GB003853
Bauch, Dorothea; Rutgers van der Loeff, Michiel; Andersen, Nils; Torres-Valdes, Sinhue; Bakker, Karel; Abrahamsen, Povl. 2011 Origin of freshwater and polynya water in the Arctic Ocean halocline in summer 2007. Progress in Oceanography, 91 (4). 482-495.10.1016/j.pocean.2011.07.017
McDonagh, E.L.; McLeod, P.; King, B.A.; Bryden, H.L.; Torres-Valdes, S.. 2010 Circulation, heat, and freshwater transport at 36°N in the Atlantic. Journal of Physical Oceanography, 40. 2661-2678.10.1175/2010JPO4176.1
Lenn, Y. D.; Wiles, P. J.; Torres-valdes, S.; Abrahamsen, E. P.; Rippeth, T. P.; Simpson, J. H.; Bacon, S.; Laxon, S. W.; Polyakov, I.; Ivanov, V.; Kirillov, S.. 2009 Vertical mixing at intermediate depths in the Arctic boundary current. Geophysical Research Letters, 36 (5), L05601. 5, pp.10.1029/2008GL036792
Abrahamsen, E. Povl; Meredith, Michael P.; Falkner, Kelly Kenison; Torres-Valdes, Sinhue; Leng, Melanie J.; Alkire, Matthew B.; Bacon, Sheldon; Laxon, Seymour W.; Polyakov, Igor; Ivanov, Vladimir. 2009 Tracer-derived freshwater composition of the Siberian continental shelf and slope following the extreme Arctic summer of 2007. Geophysical Research Letters, 36 (7), L07602. 5, pp.10.1029/2009GL037341
Torres-Valdés, S.; Roussenov, V.M.; Sanders, R.; Reynolds, S.; Pan, X.; Mather, R.; Landolfi, A.; Wolff, G.A.; Achterberg, E.P.; Williams, R.G.. 2009 Distribution of dissolved organic nutrients and their effect on export production over the Atlantic Ocean. Global Biogeochemical Cycles, 23. GB4019.10.1029/2008GB003389
Mather, Rhiannon L.; Reynolds, Sarah E.; Wolff, George A.; Williams, Richard G.; Torres-Valdes, Sinhue; Woodward, E. Malcolm S.; Landolfi, Angela; Pan, Xi; Sanders, Richard; Achterberg, Eric P.. 2008 Letter. Phosphorus cycling in the North and South Atlantic Ocean subtropical gyres. Nature Geoscience, 1 (7). 439-443.10.1038/ngeo232
Painter, Stuart C.; Sanders, Richard; Waldron, Howard N.; Lucas, Michael I.; Torres-Valdes, Sinhue. 2008 Urea distribution and uptake in the Atlantic Ocean between 50° N and 50°S. Marine Ecology Progress Series, 368. 53-63.10.3354/meps07586
Torres-Valdes, Sinhue; Purdie, Duncan A.. 2006 Nitrogen removal by phytoplankton uptake through a temperate non-turbid estuary. Estuarine, Coastal and Shelf Science, 70 (3). 473-486.10.1016/j.ecss.2006.06.028

Electronic output

Torres-valdes, Sinhue; Painter, Stuart; Martin, Adrian; Sanders, Richard. Compilation of downward flux observations from sediment trap deployments in the Atlantic Ocean - Contribution to EURO-BASIN's Data integration.. doi:10.1594/PANGAEA.807946 [Output (Electronic)]