Inorganic carbon speciation and fluxes in the Congo River
Seasonal variations in inorganic carbon chemistry and associated fluxes from the Congo River were investigated at Brazzaville-Kinshasa. Small seasonal variation in dissolved inorganic carbon (DIC) was found in contrast with discharge-correlated changes in pH, total alkalinity (TA), carbonate species...
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ftdukeunivdsp:oai:localhost:10161/17627 2023-11-12T04:15:47+01:00 Inorganic carbon speciation and fluxes in the Congo River Wang, ZA Bienvenu, DJ Mann, PJ Hoering, KA Poulsen, JR Spencer, RGM Holmes, RM 2018-11-02T03:25:38Z application/pdf https://hdl.handle.net/10161/17627 English eng American Geophysical Union (AGU) Geophysical Research Letters 10.1002/grl.50160 0094-8276 1944-8007 https://hdl.handle.net/10161/17627 Science & Technology Physical Sciences Geosciences Multidisciplinary Geology ORGANIC-MATTER AMAZONIAN RIVERS DIOXIDE CO2 BIOGEOCHEMISTRY ESTUARINE ELEMENTS WATERS BUDGET BASIN Journal article 2018 ftdukeunivdsp 2023-10-17T09:44:33Z Seasonal variations in inorganic carbon chemistry and associated fluxes from the Congo River were investigated at Brazzaville-Kinshasa. Small seasonal variation in dissolved inorganic carbon (DIC) was found in contrast with discharge-correlated changes in pH, total alkalinity (TA), carbonate species, and dissolved organic carbon (DOC). DIC was almost always greater than TA due to the importance of CO 2 *, the sum of dissolved CO 2 and carbonic acid, as a result of low pH. Organic acids in DOC contributed 11-61% of TA and had a strong titration effect on water pH and carbonate speciation. The CO 2 * and bicarbonate fluxes accounted for ~57% and 43% of the DIC flux, respectively. Congo River surface water released CO 2 at a rate of ~109 mol m -2 yr -1 . The basin-wide DIC yield was ~8.84 × 10 4 mol km -2 yr -1 . The discharge normalized DIC flux to the ocean amounted to 3.11 × 10 11 mol yr -1 . The DOC titration effect on the inorganic carbon system may also be important on a global scale for regulating carbon fluxes in rivers. Key Points The carbonate chemistry near the Congo River mouth is comprehensively studied Organic acids have a titration effect on the inorganic carbon system Surface CO 2 and inorganic carbon fluxes to the ocean are characterized ©2013. American Geophysical Union. All Rights Reserved. Article in Journal/Newspaper Carbonic acid Duke University Libraries: DukeSpace |
institution |
Open Polar |
collection |
Duke University Libraries: DukeSpace |
op_collection_id |
ftdukeunivdsp |
language |
English |
topic |
Science & Technology Physical Sciences Geosciences Multidisciplinary Geology ORGANIC-MATTER AMAZONIAN RIVERS DIOXIDE CO2 BIOGEOCHEMISTRY ESTUARINE ELEMENTS WATERS BUDGET BASIN |
spellingShingle |
Science & Technology Physical Sciences Geosciences Multidisciplinary Geology ORGANIC-MATTER AMAZONIAN RIVERS DIOXIDE CO2 BIOGEOCHEMISTRY ESTUARINE ELEMENTS WATERS BUDGET BASIN Wang, ZA Bienvenu, DJ Mann, PJ Hoering, KA Poulsen, JR Spencer, RGM Holmes, RM Inorganic carbon speciation and fluxes in the Congo River |
topic_facet |
Science & Technology Physical Sciences Geosciences Multidisciplinary Geology ORGANIC-MATTER AMAZONIAN RIVERS DIOXIDE CO2 BIOGEOCHEMISTRY ESTUARINE ELEMENTS WATERS BUDGET BASIN |
description |
Seasonal variations in inorganic carbon chemistry and associated fluxes from the Congo River were investigated at Brazzaville-Kinshasa. Small seasonal variation in dissolved inorganic carbon (DIC) was found in contrast with discharge-correlated changes in pH, total alkalinity (TA), carbonate species, and dissolved organic carbon (DOC). DIC was almost always greater than TA due to the importance of CO 2 *, the sum of dissolved CO 2 and carbonic acid, as a result of low pH. Organic acids in DOC contributed 11-61% of TA and had a strong titration effect on water pH and carbonate speciation. The CO 2 * and bicarbonate fluxes accounted for ~57% and 43% of the DIC flux, respectively. Congo River surface water released CO 2 at a rate of ~109 mol m -2 yr -1 . The basin-wide DIC yield was ~8.84 × 10 4 mol km -2 yr -1 . The discharge normalized DIC flux to the ocean amounted to 3.11 × 10 11 mol yr -1 . The DOC titration effect on the inorganic carbon system may also be important on a global scale for regulating carbon fluxes in rivers. Key Points The carbonate chemistry near the Congo River mouth is comprehensively studied Organic acids have a titration effect on the inorganic carbon system Surface CO 2 and inorganic carbon fluxes to the ocean are characterized ©2013. American Geophysical Union. All Rights Reserved. |
format |
Article in Journal/Newspaper |
author |
Wang, ZA Bienvenu, DJ Mann, PJ Hoering, KA Poulsen, JR Spencer, RGM Holmes, RM |
author_facet |
Wang, ZA Bienvenu, DJ Mann, PJ Hoering, KA Poulsen, JR Spencer, RGM Holmes, RM |
author_sort |
Wang, ZA |
title |
Inorganic carbon speciation and fluxes in the Congo River |
title_short |
Inorganic carbon speciation and fluxes in the Congo River |
title_full |
Inorganic carbon speciation and fluxes in the Congo River |
title_fullStr |
Inorganic carbon speciation and fluxes in the Congo River |
title_full_unstemmed |
Inorganic carbon speciation and fluxes in the Congo River |
title_sort |
inorganic carbon speciation and fluxes in the congo river |
publisher |
American Geophysical Union (AGU) |
publishDate |
2018 |
url |
https://hdl.handle.net/10161/17627 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
Geophysical Research Letters 10.1002/grl.50160 0094-8276 1944-8007 https://hdl.handle.net/10161/17627 |
_version_ |
1782333066644029440 |