Role of river-suspended material in the global carbon cycle
International audience The reaction of Ca derived from silicate weathering with CO2 in the world's oceans to form carbonate minerals is a critical step in long-term climate moderation. Ca is delivered to the oceans primarily via rivers, where it is transported either as dissolved species or wit...
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ftutoulouse3hal:oai:HAL:hal-00319037v1 2023-12-17T10:32:15+01:00 Role of river-suspended material in the global carbon cycle Gislason, Sigurdur R. Oelkers, Eric H. Snorrason, Árni Laboratoire des Mécanismes et Transfert en Géologie (LMTG) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) 2006-01 https://hal.science/hal-00319037 https://doi.org/10.1130/G22045.1 en eng HAL CCSD Geological Society of America info:eu-repo/semantics/altIdentifier/doi/10.1130/G22045.1 hal-00319037 https://hal.science/hal-00319037 doi:10.1130/G22045.1 ISSN: 0091-7613 EISSN: 1943-2682 Geology https://hal.science/hal-00319037 Geology, 2006, 34, pp.49. ⟨10.1130/G22045.1⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2006 ftutoulouse3hal https://doi.org/10.1130/G22045.1 2023-11-22T18:01:17Z International audience The reaction of Ca derived from silicate weathering with CO2 in the world's oceans to form carbonate minerals is a critical step in long-term climate moderation. Ca is delivered to the oceans primarily via rivers, where it is transported either as dissolved species or within suspended material. The relative importance for climate moderation of riverine dissolved Ca vs. suspended Ca transport stems from the total Ca flux and its climate dependence. Data in the literature suggest that, within uncertainty, global riverine dissolved Ca flux is equal to suspended material Ca flux. To determine how these fluxes depend on temperature and rainfall, a 40 yr field study was performed on 4 catchments in northeastern Iceland: Jökulsá á Fjöllum at Grímsstadir, Jökulsá á Dal at Brú, Jökulsá á Dal at Hjardarhagi, and Jökulsá í Fljótsdal at Hóll. Suspended material Ca flux depends more on seasonal and annual temperatures and rainfall variation than does dissolved Ca flux in all four catchments. For example, the average difference between the annual maximum and minimum daily suspended Ca flux for the Jökulsá á Dal at Brú is four orders of magnitude, whereas the difference for dissolved Ca flux is only approximately one order of magnitude. Similarly, the annual dissolved Ca flux for this river varies by a factor of 2.6, whereas its annual suspended Ca flux varies by a factor of 7.1. Because suspended material Ca flux is more dependent on climate, it provides a stronger negative feedback for stabilizing Earth's temperature through the greenhouse effect. Article in Journal/Newspaper Iceland Université Toulouse III - Paul Sabatier: HAL-UPS Jökulsá á Fjöllum ENVELOPE(-16.707,-16.707,66.150,66.150) Jökulsá á Dal ENVELOPE(-14.342,-14.342,65.635,65.635) Jökulsá í Fljótsdal ENVELOPE(-14.867,-14.867,65.117,65.117) Geology 34 1 49 |
institution |
Open Polar |
collection |
Université Toulouse III - Paul Sabatier: HAL-UPS |
op_collection_id |
ftutoulouse3hal |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Gislason, Sigurdur R. Oelkers, Eric H. Snorrason, Árni Role of river-suspended material in the global carbon cycle |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The reaction of Ca derived from silicate weathering with CO2 in the world's oceans to form carbonate minerals is a critical step in long-term climate moderation. Ca is delivered to the oceans primarily via rivers, where it is transported either as dissolved species or within suspended material. The relative importance for climate moderation of riverine dissolved Ca vs. suspended Ca transport stems from the total Ca flux and its climate dependence. Data in the literature suggest that, within uncertainty, global riverine dissolved Ca flux is equal to suspended material Ca flux. To determine how these fluxes depend on temperature and rainfall, a 40 yr field study was performed on 4 catchments in northeastern Iceland: Jökulsá á Fjöllum at Grímsstadir, Jökulsá á Dal at Brú, Jökulsá á Dal at Hjardarhagi, and Jökulsá í Fljótsdal at Hóll. Suspended material Ca flux depends more on seasonal and annual temperatures and rainfall variation than does dissolved Ca flux in all four catchments. For example, the average difference between the annual maximum and minimum daily suspended Ca flux for the Jökulsá á Dal at Brú is four orders of magnitude, whereas the difference for dissolved Ca flux is only approximately one order of magnitude. Similarly, the annual dissolved Ca flux for this river varies by a factor of 2.6, whereas its annual suspended Ca flux varies by a factor of 7.1. Because suspended material Ca flux is more dependent on climate, it provides a stronger negative feedback for stabilizing Earth's temperature through the greenhouse effect. |
author2 |
Laboratoire des Mécanismes et Transfert en Géologie (LMTG) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Gislason, Sigurdur R. Oelkers, Eric H. Snorrason, Árni |
author_facet |
Gislason, Sigurdur R. Oelkers, Eric H. Snorrason, Árni |
author_sort |
Gislason, Sigurdur R. |
title |
Role of river-suspended material in the global carbon cycle |
title_short |
Role of river-suspended material in the global carbon cycle |
title_full |
Role of river-suspended material in the global carbon cycle |
title_fullStr |
Role of river-suspended material in the global carbon cycle |
title_full_unstemmed |
Role of river-suspended material in the global carbon cycle |
title_sort |
role of river-suspended material in the global carbon cycle |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00319037 https://doi.org/10.1130/G22045.1 |
long_lat |
ENVELOPE(-16.707,-16.707,66.150,66.150) ENVELOPE(-14.342,-14.342,65.635,65.635) ENVELOPE(-14.867,-14.867,65.117,65.117) |
geographic |
Jökulsá á Fjöllum Jökulsá á Dal Jökulsá í Fljótsdal |
geographic_facet |
Jökulsá á Fjöllum Jökulsá á Dal Jökulsá í Fljótsdal |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 0091-7613 EISSN: 1943-2682 Geology https://hal.science/hal-00319037 Geology, 2006, 34, pp.49. ⟨10.1130/G22045.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1130/G22045.1 hal-00319037 https://hal.science/hal-00319037 doi:10.1130/G22045.1 |
op_doi |
https://doi.org/10.1130/G22045.1 |
container_title |
Geology |
container_volume |
34 |
container_issue |
1 |
container_start_page |
49 |
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1785585826874261504 |