Characterisation of Fe-bearing particles and colloids in the Lena River basin, NE Russia
International audience Rivers are significant contributors of Fe to the ocean. However, the characteristics of chemically reactive Fe remain poorly constrained, especially in large Arctic rivers, which drain landscapes highly susceptible to climate change and carbon cycle alteration. The aim of this...
Published in: | Geochimica et Cosmochimica Acta |
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ftmeteofrance:oai:HAL:insu-03661361v1 2024-09-15T17:54:11+00:00 Characterisation of Fe-bearing particles and colloids in the Lena River basin, NE Russia Hirst, Catherine Andersson, Per S. Shaw, Samuel Burke, Ian T. Kutscher, Liselott Murphy, Melissa J. Maximov, Trofim Pokrovsky, Oleg S. Mörth, Carl-Magnus Porcelli, Don Géosciences Environnement Toulouse (GET) 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)-Observatoire Midi-Pyrénées (OMP) 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) 2017 https://insu.hal.science/insu-03661361 https://doi.org/10.1016/j.gca.2017.07.012 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2017.07.012 insu-03661361 https://insu.hal.science/insu-03661361 BIBCODE: 2017GeCoA.213.553H doi:10.1016/j.gca.2017.07.012 ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://insu.hal.science/insu-03661361 Geochimica et Cosmochimica Acta, 2017, 213, pp.553-573. ⟨10.1016/j.gca.2017.07.012⟩ iron particles Arctic reactivity Transmission Electron Microscopy X-ray Absorption Spectroscopy [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2017 ftmeteofrance https://doi.org/10.1016/j.gca.2017.07.012 2024-06-25T00:10:21Z International audience Rivers are significant contributors of Fe to the ocean. However, the characteristics of chemically reactive Fe remain poorly constrained, especially in large Arctic rivers, which drain landscapes highly susceptible to climate change and carbon cycle alteration. The aim of this study was a detailed characterisation (size, mineralogy, and speciation) of riverine Fe-bearing particles (>0.22 μm) and colloids (1 kDa-0.22 μm) and their association with organic carbon (OC), in the Lena River and tributaries, which drain a catchment almost entirely underlain by permafrost. Samples from the main channel and tributaries representing watersheds that span a wide range in topography and lithology were taken after the spring flood in June 2013 and summer baseflow in July 2012. Fe-bearing particles were identified, using Transmission Electron Microscopy, as large (200 nm-1 μm) aggregates of smaller (20-30 nm) spherical colloids of chemically-reactive ferrihydrite. In contrast, there were also large (500 nm-1 μm) aggregates of clay (illite) particles and smaller (100-200 nm) iron oxide particles (dominantly hematite) that contain poorly reactive Fe. TEM imaging and Scanning Transmission X-ray microscopy (STXM) indicated that the ferrihydrite is present as discrete particles within networks of amorphous particulate organic carbon (POC) and attached to the surface of primary produced organic matter and clay particles. Together, these larger particles act as the main carriers of nanoscale ferrihydrite in the Lena River basin. The chemically reactive ferrihydrite accounts for on average 70 ± 15% of the total suspended Fe in the Lena River and tributaries. These observations place important constraints on Fe and OC cycling in the Lena River catchment area and Fe-bearing particle transport to the Arctic Ocean. Article in Journal/Newspaper Arctic Ocean Climate change lena river permafrost Météo-France: HAL Geochimica et Cosmochimica Acta 213 553 573 |
institution |
Open Polar |
collection |
Météo-France: HAL |
op_collection_id |
ftmeteofrance |
language |
English |
topic |
iron particles Arctic reactivity Transmission Electron Microscopy X-ray Absorption Spectroscopy [SDU]Sciences of the Universe [physics] |
spellingShingle |
iron particles Arctic reactivity Transmission Electron Microscopy X-ray Absorption Spectroscopy [SDU]Sciences of the Universe [physics] Hirst, Catherine Andersson, Per S. Shaw, Samuel Burke, Ian T. Kutscher, Liselott Murphy, Melissa J. Maximov, Trofim Pokrovsky, Oleg S. Mörth, Carl-Magnus Porcelli, Don Characterisation of Fe-bearing particles and colloids in the Lena River basin, NE Russia |
topic_facet |
iron particles Arctic reactivity Transmission Electron Microscopy X-ray Absorption Spectroscopy [SDU]Sciences of the Universe [physics] |
description |
International audience Rivers are significant contributors of Fe to the ocean. However, the characteristics of chemically reactive Fe remain poorly constrained, especially in large Arctic rivers, which drain landscapes highly susceptible to climate change and carbon cycle alteration. The aim of this study was a detailed characterisation (size, mineralogy, and speciation) of riverine Fe-bearing particles (>0.22 μm) and colloids (1 kDa-0.22 μm) and their association with organic carbon (OC), in the Lena River and tributaries, which drain a catchment almost entirely underlain by permafrost. Samples from the main channel and tributaries representing watersheds that span a wide range in topography and lithology were taken after the spring flood in June 2013 and summer baseflow in July 2012. Fe-bearing particles were identified, using Transmission Electron Microscopy, as large (200 nm-1 μm) aggregates of smaller (20-30 nm) spherical colloids of chemically-reactive ferrihydrite. In contrast, there were also large (500 nm-1 μm) aggregates of clay (illite) particles and smaller (100-200 nm) iron oxide particles (dominantly hematite) that contain poorly reactive Fe. TEM imaging and Scanning Transmission X-ray microscopy (STXM) indicated that the ferrihydrite is present as discrete particles within networks of amorphous particulate organic carbon (POC) and attached to the surface of primary produced organic matter and clay particles. Together, these larger particles act as the main carriers of nanoscale ferrihydrite in the Lena River basin. The chemically reactive ferrihydrite accounts for on average 70 ± 15% of the total suspended Fe in the Lena River and tributaries. These observations place important constraints on Fe and OC cycling in the Lena River catchment area and Fe-bearing particle transport to the Arctic Ocean. |
author2 |
Géosciences Environnement Toulouse (GET) 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)-Observatoire Midi-Pyrénées (OMP) 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 |
Hirst, Catherine Andersson, Per S. Shaw, Samuel Burke, Ian T. Kutscher, Liselott Murphy, Melissa J. Maximov, Trofim Pokrovsky, Oleg S. Mörth, Carl-Magnus Porcelli, Don |
author_facet |
Hirst, Catherine Andersson, Per S. Shaw, Samuel Burke, Ian T. Kutscher, Liselott Murphy, Melissa J. Maximov, Trofim Pokrovsky, Oleg S. Mörth, Carl-Magnus Porcelli, Don |
author_sort |
Hirst, Catherine |
title |
Characterisation of Fe-bearing particles and colloids in the Lena River basin, NE Russia |
title_short |
Characterisation of Fe-bearing particles and colloids in the Lena River basin, NE Russia |
title_full |
Characterisation of Fe-bearing particles and colloids in the Lena River basin, NE Russia |
title_fullStr |
Characterisation of Fe-bearing particles and colloids in the Lena River basin, NE Russia |
title_full_unstemmed |
Characterisation of Fe-bearing particles and colloids in the Lena River basin, NE Russia |
title_sort |
characterisation of fe-bearing particles and colloids in the lena river basin, ne russia |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://insu.hal.science/insu-03661361 https://doi.org/10.1016/j.gca.2017.07.012 |
genre |
Arctic Ocean Climate change lena river permafrost |
genre_facet |
Arctic Ocean Climate change lena river permafrost |
op_source |
ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://insu.hal.science/insu-03661361 Geochimica et Cosmochimica Acta, 2017, 213, pp.553-573. ⟨10.1016/j.gca.2017.07.012⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2017.07.012 insu-03661361 https://insu.hal.science/insu-03661361 BIBCODE: 2017GeCoA.213.553H doi:10.1016/j.gca.2017.07.012 |
op_doi |
https://doi.org/10.1016/j.gca.2017.07.012 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
213 |
container_start_page |
553 |
op_container_end_page |
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