Assessing long-term response of seawater to external perturbations such as atmospheric greenhouse gas and contaminants
Închide
Articolul precedent
Articolul urmator
685 2
Ultima descărcare din IBN:
2021-06-16 15:53
SM ISO690:2012
POVAR, Igor, SPINU, Oxana, GOYET, Catherine. Assessing long-term response of seawater to external perturbations such as atmospheric greenhouse gas and contaminants. In: Ecological and environmental chemistry : - 2017, Ed. 6, 2-3 martie 2017, Chișinău. Chisinau, Republic of Moldova: Academy of Sciences of Moldova, 2017, Ediția 6, p. 110.
EXPORT metadate:
Google Scholar
Crossref
CERIF

DataCite
Dublin Core
Ecological and environmental chemistry
Ediția 6, 2017
Conferința "Ecological and environmental chemistry 2017"
6, Chișinău, Moldova, 2-3 martie 2017

Assessing long-term response of seawater to external perturbations such as atmospheric greenhouse gas and contaminants


Pag. 110-110

Povar Igor1, Spinu Oxana1, Goyet Catherine2
 
1 Institute of Chemistry of the Academy of Sciences of Moldova,
2 University of Perpignan Via Domita
 
Disponibil în IBN: 12 martie 2019


Rezumat

The seawater is subject to multiple external perturbations (EP) including rising atmospheric CO2 and ocean acidification, global warming, atmospheric deposition of pollutants and eutrophication, which deeply alter its chemistry, often on a global scale and, in some cases, at the degree significantly exceeding that in the historical and recent geological verification. In ocean systems the micro- and macronutrients, heavy metals, phosphor- and nitrogen-containing components exist in different forms depending on the concentrations of various other species, organic matter, the types of minerals, the pH etc. The major limitation to assessing more strictly the EP to oceans, such as pollutants (atmospheric greenhouse gas, heavy metals, nutrients as nitrates and phosphates) is the lack of theoretical approach which could predict the ocean resistance to multiple external stressors. In order to assess the abovementioned EP, the planned common research will apply and develop the buffer theory approach and theoretical expressions of the formal chemical thermodynamics to ocean systems, as heterogeneous aqueous systems, recently developed and published [1-7]. The thermodynamic expressions of complex equilibria for the conditions under which solids involving common ions can coexist at equilibrium, the acid-base and mineral equilibria and complex formation will be developed. This thermodynamic approach will utilize thermodynamic relationships coupled with original mass balance constraints, where the solid phases are explicitly expressed. The ocean sensitivity to different external perturbations and changes in driving factors will be expressed in terms of derived buffering capacities or buffer factors for heterogeneous systems. The designed investigations will prove that the heterogeneous aqueous systems, as ocean and seas are, manifest their buffer properties towards all their components, not only to pH, as it has been known so far, for example in respect to carbon dioxide, carbonates, phosphates, Ca2+, Mg2+, heavy metal ions etc. The derived expressions will make possible to attribute changes in chemical ocean composition to different pollutants. These expressions will be also useful for improving the current atmosphere-ocean-marine biogeochemistry models. The ammonium, phosphate, nitrate, nitrite, sulphide, silicate, fluoride and sulphate acid–base systems will be included in our derivation, as well as the contribution of other minor acid–base species and organic acids, which can substantially contribute to ocean resistance in estuarine and other coastal waters. The deduced expressions will be valid for any combination of chemical composition, or any of the species contributing to the total concentration, as independent state variable.