On the variation of alkalinity during phytoplankton photosynthesis
On the variation of alkalinity during phytoplankton photosynthesis
[ES] En este artículo se estima la alcalinidad de los compuestos orgánicos producidos por el fitoplancton marino y su contribución al cambio de alcalinidad total (TA) del agua de mar durante la fotosíntesis. Tras cuantificar la contribución de los pigmentos fotosintéticos, las proteínas y los compuestos de fósforo al balance de H+ del agua de mar referida a las variaciones de nitrógeno inorgánico (∆[NT] = ∆[NH4 +] + ∆[N2] + ∆[NO2 –] + ∆[NO3 –]) y fósforo inorgánico (∆[PT]) totales durante la fotosíntesis, se obtiene que los constituyentes orgánicos del fitoplancton marino tienen una alcalinidad de –0.06 × ∆[NT] – 0.49 × ∆[PT], y que la alcalinidad potencial (TAP) durante la fotosíntesis es TAP = TA – [NH4 –] + 0.93 × [NO2 –] + [NO3 –] + 0.08 × [NT] + 0.23 × [PT] para muestras no filtradas y TAP = TA – [NH4 –] + 0.93 × [NO2 –] + [NO3 –] + 0.02 × [NT] + 0.26 × [PT] para muestras filtradas. Estas expresiones corrigen la ecuación tradicional de TAP = TA + [NO3 –]. Procesos tales como la fijación de N2, la producción de DMSP y, sobre todo, la síntesis de CaCO3, producen desviaciones crecientes en el comportamiento conservativo de la TAP.
[EN] The alkalinity of the organic constituents of marine phytoplankton and their participation in the total alkalinity (TA) change of seawater during photosynthesis are carefully assessed. Quantification of the contribution of phytoplankton chlorophyll, proteins and phosphorus compounds to the hydrogen ion balance of seawater in terms of total inorganic nitrogen (∆[NT] = ∆[NH4 +] + ∆[N2] + ∆[NO2 –] + ∆[NO3 –]) and total inorganic phosphorus (∆[PT]) changes during photosynthesis yielded that the organic components of marine phytoplankton are alkaline by –0.06 × ∆[NT] – 0.49 × ∆[PT], and that the potential total alkalinity (TAP) during photosynthesis is TAP = TA – [NH4 –] + 0.93 × [NO2 –] + [NO3 –] + 0.08 × [NT] + 0.23 × [PT] for unfiltered seawater samples and TAP = TA – [NH4 –] + 0.93 × [NO2 –] + [NO3 –] + 0.02 × [NT] + 0.26 × [PT] for filtered seawater samples. These equations correct the traditionally used expression TAP = TA + [NO3 –]. The TAP anomalies are produced, in order of increasing importance, by N2 fixation, DMSP production and CaCO3 fixation.
This study received financial support from the Spanish Comisión Interministerial de Ciencia y Tecnolgía (CICYT), through grants MAR99-1039-C02-01 and REN2000-0880-C02-01.
14 pages, 2 tables.
Peer reviewed
Carbon cycling, Mineralization, Alcalinidad total, Producción primaria, Primary production, Total alkalinity, Phytoplankton, Mineralización, Ciclo del carbono, Fitoplancton
Carbon cycling, Mineralization, Alcalinidad total, Producción primaria, Primary production, Total alkalinity, Phytoplankton, Mineralización, Ciclo del carbono, Fitoplancton
selected citations These citations are derived from selected sources.This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).0 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average
Citations provided by BIP!Popularity provided by BIP!