Chemical denudation and the role of sulfide oxidation at Werenskioldbreen, Svalbard
PBN-AR
Instytucja
Wydział Chemiczny (Politechnika Gdańska)
Informacje podstawowe
Główny język publikacji
ENG
Czasopismo
JOURNAL OF HYDROLOGY
ISSN
0022-1694
EISSN
Wydawca
DOI
URL
Rok publikacji
2016
Numer zeszytu
Strony od-do
177-193
Numer tomu
538
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
SIMPLE HYDROLYSIS
SPITSBERGEN
SULFIDE OXIDATION
WERENSKIOLDBREEN
Streszczenia
Język
Treść
This study aims to determine the rate of chemical denudation and the relationships between dominant geochemical reactions operating in the proglacial and subglacial environments of the polythermal glacier Werenskioldbreen (SW Svalbard) during an entire ablation season. Water sampling for major ion chemistry was performed at a proglacial hydrometric station and from subglacial outflows from May to September 2011. These data were combined with measurements of discharge and supraglacial ablation rates. Our findings also show that sulfide oxidation is a better indicator of the configuration of subglacial drainage systems than, for instance, Na+ and K+. In the proglacial area and in sub-artesian outflows, the ion associations represent sulfide oxidation but other processes such as ion exchange and dissolution of Ca and Mg efflorescent salts may also contribute to the solute variations. These processes may cause enhanced fluxes of Ca2+ and HCO3- from glacierized basins during the early ablation and peak flow seasons as the proglacial salts re-dissolve. The overall chemical denudation rate in the basin for 2011 (ranging from 1601 to 1762 meq m(-2) yr(-1) (121.9 to 132.2 t km(-2) yr(-1))) was very high when compared to other Svalbard valley glaciers suggesting that the high rate of chemical denudation was mostly caused by the high rates of discharge and ablation. Chemical weathering intensities (876 and 964 meq m(-3) yr(-1)) exceeded previously reported intensities in Svalbard.
Inne
System-identifier
137144