کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4533592 1325202 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Benthic fluxes of dissolved inorganic carbon in the Tinto-Odiel system (SW of Spain)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Benthic fluxes of dissolved inorganic carbon in the Tinto-Odiel system (SW of Spain)
چکیده انگلیسی
The benthic fluxes (diffusive and with chambers) of dissolved inorganic carbon (DIC), dissolved oxygen (DO) and total alkalinity (TA) have been calculated in summertime in the estuary system formed by the mouths of the Tinto and Odiel rivers (SW of Spain). An increase of DIC in interstitial water with depth was found for all stations showing values of up to 28 mM at a depth of 5 cm. The diffusive fluxes of DIC and TA obtained ranging between 1.8-7.8 and 1.5-7.3 mmol m−2 d−1, respectively. These intervals are in agreement with those found for other coastal systems. Considering the plots of DIC vs. alkalinity (ΔDIC/ΔTA) in the first 30 cm of interstitial water, it was deduced that sulphate reduction and the oxidation of sulphides seem to have special relevance in the sediments of the stations studied. The benthic fluxes of inorganic carbon and DO measured by benthic chambers were variable, presenting elevated values (309-433 mmol DIC m−2 d−1 and 50-120 mmol DO m−2 d−1). The most elevated fluxes of DIC were seen at the stations with high anthropogenic influence (close to populated areas and industrial discharges). A great proportion of these fluxes are due to CaCO3 dissolution processes, which constitute an estimated 49% of total DIC flux. DIC and DO benthic flux quotients were far in excess of unity, indicating the significance processes of anaerobic degradation of organic material at the stations studied.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Continental Shelf Research - Volume 28, Issue 3, 15 February 2008, Pages 458-469
نویسندگان
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