Martínez Cortizas, Antonio, López-Costas, Olalla, Orme, Lisa C., Mighall, Timothy, Kylander, Malin E., Bindler, Richard and Gallego-Sala, Angela V. (2019) Holocene atmospheric dust deposition in NW Spain. Holocene, 30 (4). pp. 507-518. ISSN 0959-6836
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Abstract
Atmospheric dust plays an important role in terrestrial and marine ecosystems, particularly those that are nutrient limited. Despite that most dust
originates from arid and semi-arid regions, recent research has shown that past dust events may have been involved in boosting productivity in nutrientpoor
peatlands. We investigated dust deposition in a mid-latitude, raised bog, which is surrounded by a complex geology (paragneiss/schist, granite,
quartzite and granodiorite). As proxies for dust fluxes, we used accumulation rates of trace (Ti, Zr, Rb, Sr and Y) as well as major (K and Ca) lithogenic
elements. The oldest, largest dust deposition event occurred between ~8.6 and ~7.4 ka BP, peaking at ~8.1 ka BP (most probably the 8.2 ka BP event).
The event had a large impact on the evolution of the mire, which subsequently transitioned from a fen into a raised bog in ~1500 years. From ~6.7 to ~4.0
ka BP, fluxes were very low, coeval with mid-Holocene forest stability and maximum extent. In the late Holocene, after ~4.0 ka BP, dust events became
more prevalent with relatively major deposition at ~3.2–2.5, ~1.4 ka BP and ~0.35–0.05 ka BP, and minor peaks at ~4.0–3.7, ~1.7, ~1.10–0.95 ka BP and
~0.74–0.58 ka BP. Strontium fluxes display a similar pattern between ~11 and ~6.7 ka BP but then became decoupled from the other elements from the
mid Holocene onwards. This seems to be a specific signal of the granodiorite batholith, which has an Sr anomaly. The reconstructed variations in dust
fluxes bear a strong climatic imprint, probably related to storminess controlled by North Atlantic Oscillation conditions. Complex interactions also arise
because of increased pressure from human activities.
Item Type: | Article |
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Additional Information: | Cite as: Martínez Cortizas A, López-Costas O, Orme L, et al. Holocene atmospheric dust deposition in NW Spain. The Holocene. 2020;30(4):507-518. doi:10.1177/0959683619875193 |
Keywords: | dust; Holocene; human activities; NAO; peat records; storminess; |
Academic Unit: | Faculty of Social Sciences > Geography Faculty of Social Sciences > Research Institutes > Irish Climate Analysis and Research Units, ICARUS |
Item ID: | 13604 |
Identification Number: | 10.1177/0959683619875193 |
Depositing User: | Lisa Orme |
Date Deposited: | 23 Nov 2020 15:38 |
Journal or Publication Title: | Holocene |
Publisher: | SAGE Publications |
Refereed: | Yes |
Related URLs: | |
URI: | https://mural.maynoothuniversity.ie/id/eprint/13604 |
Use Licence: | This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here |
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