Variability in sediment particle size, mineralogy, and Fe mode of occurrence across dust-source inland drainage basins: the case of the lower Drâa Valley, Morocco
The effects of desert dust upon climate and ecosystems depend strongly on its particle size and size-resolved mineralogical composition. However, there is very limited quantitative knowledge on the particle size and composition of the parent sediments along with their variability within dust-source...
| Autores: | , , , , , , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/401592 |
| Acceso en línea: | https://hdl.handle.net/2117/401592 https://dx.doi.org/10.5194/acp-23-15815-2023 |
| Access Level: | acceso abierto |
| Palabra clave: | Mineral dusts Air--Pollution Sahara Pols minerals Aire--Contaminació Sàhara Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental |
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Variability in sediment particle size, mineralogy, and Fe mode of occurrence across dust-source inland drainage basins: the case of the lower Drâa Valley, MoroccoGonzález Romero, AdolfoGonzález Flórez, CristinaPanta, AgneshYus Díez, JesúsReche Andúgar, CristinaCórdoba Sola, PatriciaMoreno Palmerola, NatàliaAlastuey Urós, AndrésKandler, KonradKlose, Martina|||0000-0001-8190-3700Baldo, ClarissaNelson Clark, RogerShi, ZongBoQuerol Carceller, XavierPérez García-Pando, Carlos|||0000-0002-4456-0697Mineral dustsAir--PollutionSaharaPols mineralsAire--ContaminacióSàharaÀrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambientalThe effects of desert dust upon climate and ecosystems depend strongly on its particle size and size-resolved mineralogical composition. However, there is very limited quantitative knowledge on the particle size and composition of the parent sediments along with their variability within dust-source regions, particularly in dust emission hotspots. The lower Drâa Valley, an inland drainage basin and dust hotspot region located in the Moroccan Sahara, was chosen for a comprehensive analysis of sediment particle size and mineralogy. Different sediment type samples (n=¿42) were collected, including paleo-sediments, paved surfaces, crusts, and dunes, and analysed for particle-size distribution (minimally and fully dispersed samples) and mineralogy. Furthermore, Fe sequential wet extraction was carried out to characterise the modes of occurrence of Fe, including Fe in Fe (oxyhydr)oxides, mainly from goethite and hematite, which are key to dust radiative effects; the poorly crystalline pool of Fe (readily exchangeable ionic Fe and Fe in nano-Fe oxides), relevant to dust impacts upon ocean biogeochemistry; and structural Fe. Results yield a conceptual model where both particle size and mineralogy are segregated by transport and deposition of sediments during runoff of water across the basin and by the precipitation of salts, which causes a sedimentary fractionation. The proportion of coarser particles enriched in quartz is higher in the highlands, while that of finer particles rich in clay, carbonates, and Fe oxides is higher in the lowland dust emission hotspots. There, when water ponds and evaporates, secondary carbonates and salts precipitate, and the clays are enriched in readily exchangeable ionic Fe, due to sorption of dissolved Fe by illite. The results differ from currently available mineralogical atlases and highlight the need for observationally constrained global high-resolution mineralogical data for mineral-speciated dust modelling. The dataset obtained represents an important resource for future evaluation of surface mineralogy retrievals from spaceborne spectroscopy.Peer ReviewedEuropean Geosciences Union (EGU)20232023-12-2220242024-02-09journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/401592https://dx.doi.org/10.5194/acp-23-15815-2023reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)InglésengEuropean Commission http://doi.org/10.13039/100010661 Horizon 2020 Framework Programme 773051 FRontiers in dust minerAloGical coMposition and its Effects upoN climaTeopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4015922026-05-27T15:37:01Z |
| dc.title.none.fl_str_mv |
Variability in sediment particle size, mineralogy, and Fe mode of occurrence across dust-source inland drainage basins: the case of the lower Drâa Valley, Morocco |
| title |
Variability in sediment particle size, mineralogy, and Fe mode of occurrence across dust-source inland drainage basins: the case of the lower Drâa Valley, Morocco |
| spellingShingle |
Variability in sediment particle size, mineralogy, and Fe mode of occurrence across dust-source inland drainage basins: the case of the lower Drâa Valley, Morocco González Romero, Adolfo Mineral dusts Air--Pollution Sahara Pols minerals Aire--Contaminació Sàhara Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental |
| title_short |
Variability in sediment particle size, mineralogy, and Fe mode of occurrence across dust-source inland drainage basins: the case of the lower Drâa Valley, Morocco |
| title_full |
Variability in sediment particle size, mineralogy, and Fe mode of occurrence across dust-source inland drainage basins: the case of the lower Drâa Valley, Morocco |
| title_fullStr |
Variability in sediment particle size, mineralogy, and Fe mode of occurrence across dust-source inland drainage basins: the case of the lower Drâa Valley, Morocco |
| title_full_unstemmed |
Variability in sediment particle size, mineralogy, and Fe mode of occurrence across dust-source inland drainage basins: the case of the lower Drâa Valley, Morocco |
| title_sort |
Variability in sediment particle size, mineralogy, and Fe mode of occurrence across dust-source inland drainage basins: the case of the lower Drâa Valley, Morocco |
| dc.creator.none.fl_str_mv |
González Romero, Adolfo González Flórez, Cristina Panta, Agnesh Yus Díez, Jesús Reche Andúgar, Cristina Córdoba Sola, Patricia Moreno Palmerola, Natàlia Alastuey Urós, Andrés Kandler, Konrad Klose, Martina|||0000-0001-8190-3700 Baldo, Clarissa Nelson Clark, Roger Shi, ZongBo Querol Carceller, Xavier Pérez García-Pando, Carlos|||0000-0002-4456-0697 |
| author |
González Romero, Adolfo |
| author_facet |
González Romero, Adolfo González Flórez, Cristina Panta, Agnesh Yus Díez, Jesús Reche Andúgar, Cristina Córdoba Sola, Patricia Moreno Palmerola, Natàlia Alastuey Urós, Andrés Kandler, Konrad Klose, Martina|||0000-0001-8190-3700 Baldo, Clarissa Nelson Clark, Roger Shi, ZongBo Querol Carceller, Xavier Pérez García-Pando, Carlos|||0000-0002-4456-0697 |
| author_role |
author |
| author2 |
González Flórez, Cristina Panta, Agnesh Yus Díez, Jesús Reche Andúgar, Cristina Córdoba Sola, Patricia Moreno Palmerola, Natàlia Alastuey Urós, Andrés Kandler, Konrad Klose, Martina|||0000-0001-8190-3700 Baldo, Clarissa Nelson Clark, Roger Shi, ZongBo Querol Carceller, Xavier Pérez García-Pando, Carlos|||0000-0002-4456-0697 |
| author2_role |
author author author author author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
Mineral dusts Air--Pollution Sahara Pols minerals Aire--Contaminació Sàhara Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental |
| topic |
Mineral dusts Air--Pollution Sahara Pols minerals Aire--Contaminació Sàhara Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental |
| description |
The effects of desert dust upon climate and ecosystems depend strongly on its particle size and size-resolved mineralogical composition. However, there is very limited quantitative knowledge on the particle size and composition of the parent sediments along with their variability within dust-source regions, particularly in dust emission hotspots. The lower Drâa Valley, an inland drainage basin and dust hotspot region located in the Moroccan Sahara, was chosen for a comprehensive analysis of sediment particle size and mineralogy. Different sediment type samples (n=¿42) were collected, including paleo-sediments, paved surfaces, crusts, and dunes, and analysed for particle-size distribution (minimally and fully dispersed samples) and mineralogy. Furthermore, Fe sequential wet extraction was carried out to characterise the modes of occurrence of Fe, including Fe in Fe (oxyhydr)oxides, mainly from goethite and hematite, which are key to dust radiative effects; the poorly crystalline pool of Fe (readily exchangeable ionic Fe and Fe in nano-Fe oxides), relevant to dust impacts upon ocean biogeochemistry; and structural Fe. Results yield a conceptual model where both particle size and mineralogy are segregated by transport and deposition of sediments during runoff of water across the basin and by the precipitation of salts, which causes a sedimentary fractionation. The proportion of coarser particles enriched in quartz is higher in the highlands, while that of finer particles rich in clay, carbonates, and Fe oxides is higher in the lowland dust emission hotspots. There, when water ponds and evaporates, secondary carbonates and salts precipitate, and the clays are enriched in readily exchangeable ionic Fe, due to sorption of dissolved Fe by illite. The results differ from currently available mineralogical atlases and highlight the need for observationally constrained global high-resolution mineralogical data for mineral-speciated dust modelling. The dataset obtained represents an important resource for future evaluation of surface mineralogy retrievals from spaceborne spectroscopy. |
| publishDate |
2023 |
| dc.date.none.fl_str_mv |
2023 2023-12-22 2024 2024-02-09 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2117/401592 https://dx.doi.org/10.5194/acp-23-15815-2023 |
| url |
https://hdl.handle.net/2117/401592 https://dx.doi.org/10.5194/acp-23-15815-2023 |
| dc.language.none.fl_str_mv |
Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.relation.none.fl_str_mv |
European Commission http://doi.org/10.13039/100010661 Horizon 2020 Framework Programme 773051 FRontiers in dust minerAloGical coMposition and its Effects upoN climaTe |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
| dc.rights.openaire.fl_str_mv |
info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
European Geosciences Union (EGU) |
| publisher.none.fl_str_mv |
European Geosciences Union (EGU) |
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reponame:UPCommons. Portal del coneixement obert de la UPC instname:Universitat Politècnica de Catalunya (UPC) |
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UPCommons. Portal del coneixement obert de la UPC |
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