Seasonal cycle of N:P:TA stoichiometry as a modulator of CO2 buffering in eastern boundary upwelling systems

Gregor, LMonteiro, Pedro MS2014-06-172014-06-172013-10Gregor, L and Monteiro, P.M.S. 2013. Seasonal cycle of N:P:TA stoichiometry as a modulator of CO2 buffering in eastern boundary upwelling systems. Geophysical Research Letters, vol. 40(20), pp 5429-54340094-8276http://onlinelibrary.wiley.com/doi/10.1002/2013GL058036/abstracthttp://hdl.handle.net/10204/7441Copyright: 2013 American Geophysical Union (AGU). Published in Geophysical Research Letters, vol. 40(20), pp 5429-5434In this study we use the southern Benguela upwelling system to investigate the role of nutrient and carbon stoichiometry on carbonate dynamics in eastern boundary upwelling systems. Six months in 2010 were sampled along a cross-shelf transect. Data were classified into summer, autumn, and winter. Nitrate, phosphate, dissolved inorganic carbon, and total alkalinity ratios were used in a stoichiometric reconstruction model to determine the contribution of biogeochemical processes on a parcel of water as it upwelled. Deviations from the Redfield ratio were dominated by denitrification and sulfate reduction in the subsurface waters. The N:P ratio was lowest (7.2) during autumn once anoxic waters had formed. Total alkalinity (TA) generation by anaerobic remineralization decreased pCO(sub2) by 227 µatm. Ventilation during summer and winter resulted in elevated N:P ratios (12.3). We propose that anaerobic production of TA has an important regional effect in mitigating naturally high CO(sub2) and making upwelled waters less corrosive.enN:P:TA stoichiometryBenguela upwellingSouthern BenguelaClimate researchCarbon stoichiometryStoichiometric reconstruction modelSeasonal cycle of N:P:TA stoichiometry as a modulator of CO2 buffering in eastern boundary upwelling systemsArticleGregor, L., & Monteiro, P. M. (2013). Seasonal cycle of N:P:TA stoichiometry as a modulator of CO2 buffering in eastern boundary upwelling systems. http://hdl.handle.net/10204/7441Gregor, L, and Pedro MS Monteiro "Seasonal cycle of N:P:TA stoichiometry as a modulator of CO2 buffering in eastern boundary upwelling systems." (2013) http://hdl.handle.net/10204/7441Gregor L, Monteiro PM. Seasonal cycle of N:P:TA stoichiometry as a modulator of CO2 buffering in eastern boundary upwelling systems. 2013; http://hdl.handle.net/10204/7441.TY - Article AU - Gregor, L AU - Monteiro, Pedro MS AB - In this study we use the southern Benguela upwelling system to investigate the role of nutrient and carbon stoichiometry on carbonate dynamics in eastern boundary upwelling systems. Six months in 2010 were sampled along a cross-shelf transect. Data were classified into summer, autumn, and winter. Nitrate, phosphate, dissolved inorganic carbon, and total alkalinity ratios were used in a stoichiometric reconstruction model to determine the contribution of biogeochemical processes on a parcel of water as it upwelled. Deviations from the Redfield ratio were dominated by denitrification and sulfate reduction in the subsurface waters. The N:P ratio was lowest (7.2) during autumn once anoxic waters had formed. Total alkalinity (TA) generation by anaerobic remineralization decreased pCO(sub2) by 227 µatm. Ventilation during summer and winter resulted in elevated N:P ratios (12.3). We propose that anaerobic production of TA has an important regional effect in mitigating naturally high CO(sub2) and making upwelled waters less corrosive. DA - 2013-10 DB - ResearchSpace DP - CSIR KW - N:P:TA stoichiometry KW - Benguela upwelling KW - Southern Benguela KW - Climate research KW - Carbon stoichiometry KW - Stoichiometric reconstruction model LK - https://researchspace.csir.co.za PY - 2013 SM - 0094-8276 T1 - Seasonal cycle of N:P:TA stoichiometry as a modulator of CO2 buffering in eastern boundary upwelling systems TI - Seasonal cycle of N:P:TA stoichiometry as a modulator of CO2 buffering in eastern boundary upwelling systems UR - http://hdl.handle.net/10204/7441 ER -