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Naslov:Characterization of the particle size distribution, mineralogy, and Fe mode of occurrence of dust-emitting sediments from the Mojave Desert, California, USA
Avtorji:ID Gonzalez-Romero, Adolfo (Avtor)
ID González-Flórez, Cristina (Avtor)
ID Panta, Agnesh (Avtor)
ID Yus-Díez, Jesús (Avtor)
ID Córdoba, Patricia (Avtor)
ID Alastuey, Andrés (Avtor)
ID Jiménez-Moreno, Natalia (Avtor)
ID Hernández-Chiriboga, Melani (Avtor)
ID Kandler, Konrad (Avtor)
ID Klose, Martina (Avtor), et al.
Datoteke:.pdf RAZ_Gonzalez-Romero_Adolfo_2024.pdf (10,28 MB)
MD5: 9C8B3ECFED69858CB8D48FE80408DDF3
 
URL https://acp.copernicus.org/articles/24/9155/2024/acp-24-9155-2024.pdf
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:Abstract. Constraining dust models to understand and quantify the effect of dust upon climate and ecosystems requires comprehensive analyses of the physiochemical properties of dust-emitting sediments in arid regions. Building upon previous studies in the Moroccan Sahara and Iceland, we analyse a diverse set of crusts and aeolian ripples (n=55) from various potential dust-emitting basins within the Mojave Desert, California, USA. Our focus is on characterizing the particle size distribution (PSD), mineralogy, aggregation/cohesion state, and Fe mode of occurrence. Our results show differences in fully and minimally dispersed PSDs, with crusts exhibiting average median diameters of 92 and 37 µm, respectively, compared to aeolian ripples with 226 and 213 µm, respectively. Mineralogical analyses unveiled strong variations between crusts and ripples, with crusts being enriched in phyllosilicates (24 % vs. 7.8 %), carbonates (6.6 % vs. 1.1 %), Na salts (7.3 % vs. 1.1 %), and zeolites (1.2 % and 0.12 %) and ripples being enriched in feldspars (48 % vs. 37 %), quartz (32 % vs. 16 %), and gypsum (4.7 % vs. 3.1 %). The size fractions from crust sediments display a homogeneous mineralogy, whereas those of aeolian ripples display more heterogeneity, mostly due to different particle aggregation. Bulk Fe content analyses indicate higher concentrations in crusts (3.0 ± 1.3 wt %) compared to ripples (1.9 ± 1.1 wt %), with similar proportions in their Fe mode of occurrence: nano-sized Fe oxides and readily exchangeable Fe represent ∼1.6 %, hematite and goethite ∼15 %, magnetite/maghemite ∼2.0 %, and structural Fe in silicates ∼80 % of the total Fe. We identified segregation patterns in the PSD and mineralogy differences in Na salt content within the Mojave basins, which can be explained by sediment transportation dynamics and precipitates due to groundwater table fluctuations described in previous studies in the region. Mojave Desert crusts show similarities with previously sampled crusts in the Moroccan Sahara in terms of the PSD and readily exchangeable Fe yet exhibit substantial differences in mineralogical composition, which should significantly influence the characteristic of the emitted dust particles.
Ključne besede:mineral dust, iron oxides
Status publikacije:Objavljeno
Verzija publikacije:Objavljena publikacija
Datum objave:01.01.2024
Leto izida:2024
Št. strani:str. 9155-9176
Številčenje:Vol. 24, issue 16
PID:20.500.12556/RUNG-9512-256aebb8-9053-ffc4-7e79-69dc9cee46af Novo okno
COBISS.SI-ID:216982531 Novo okno
UDK:502.3/.7
ISSN pri članku:1680-7324
eISSN:1680-7324
DOI:10.5194/acp-24-9155-2024 Novo okno
NUK URN:URN:SI:UNG:REP:0LV8073T
Datum objave v RUNG:29.11.2024
Število ogledov:198
Število prenosov:0
Metapodatki:XML DC-XML DC-RDF
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Gradivo je del revije

Naslov:Atmospheric chemistry and physics
Skrajšan naslov:Atmos. chem. phys.
Založnik:European Geophysical Society, Copernicus GmbH
ISSN:1680-7324
COBISS.SI-ID:1959012 Novo okno

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
Začetek licenciranja:22.08.2024

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