Saharan aeolian input and effective humidity variations over western Europe during the Holocene from a high altitude record

Jiménez-Espejo, Francisco Jose; García‐Alix, Antonio; Jiménez‐Moreno, Gonzalo; Rodrigo-Gámiz, Marta; Anderson, R. Scott; Rodríguez‐Tovar, Francisco J.; Martı́nez-Ruiz, Francisca; Giralt, Santiago; Huertas, António Delgado; Pardo‐Igúzquiza, Eulogio

doi:10.1016/j.chemgeo.2014.03.001

Cited by 84 publications

(93 citation statements)

References 142 publications

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“…A suite of proxy previous studies supports our conclusions regarding the aridification trend since the middle Holocene (Carrión, 2002;Carrión et al, 2010;Fletcher and Sánchez-Goñi, 2008;Fletcher et al, 2013;Jiménez-Espejo et al, 2014;Jiménez-Moreno et al, 2015). In the western Mediterranean region the decline in forest development during the middle and late Holocene is related to a decrease in summer insolation (Jiménez- Moreno and Anderson, 2012;Fletcher et al, 2013), which may have decreased winter rainfall as a consequence of a northward shift of the westerlies -a long-term enhanced positive NAO trend -which has induced drier conditions in this area since ∼ 6000 cal yr BP (Magny et al, 2012).…”

Section: Late Holocene Aridification Trendsupporting

confidence: 78%

“…Previous cyclostratigraphic analysis in Holocene western Mediterranean records suggest cyclical climatic oscillations with periodicities around 1500 and 1750 years (Fletcher et al, 2013;Jiménez-Espejo et al, 2014;. Other North Atlantic and Mediterranean records also present cyclicities of ∼ 1600 years in their paleoclimatic proxies (Bond et al, 2001;Debret et al, 2007;RodrigoGámiz et al, 2014).…”

Section: Centennial-scale Variabilitymentioning

confidence: 99%

“…Time series analysis has become important in determining the recurrent periodicity of cyclical oscillations in paleoenvironmental sequences (e.g., Fletcher et al, 2013;Jiménez-Espejo et al, 2014;Rodrigo-Gámiz et al, 2014;RamosRomán et al, 2016). This analysis also assists in understanding possible relationships between the paleoenvironmental proxy data and the potential triggers of the observed cyclical changes: i.e., solar activity, atmospheric and oceanic dynamics, and climate evolution during the Holocene.…”

Section: Centennial-scale Variabilitymentioning

confidence: 99%

See 2 more Smart Citations

Holocene climate aridification trend and human impact interrupted by millennial- and centennial-scale climate fluctuations from a new sedimentary record from Padul (Sierra Nevada, southern Iberian Peninsula)

et al. 2018

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Section: Late Holocene Aridification Trendsupporting

confidence: 78%

Section: Centennial-scale Variabilitymentioning

confidence: 99%

Section: Centennial-scale Variabilitymentioning

confidence: 99%

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Holocene climate aridification trend and human impact interrupted by millennial- and centennial-scale climate fluctuations from a new sedimentary record from Padul (Sierra Nevada, southern Iberian Peninsula)

et al. 2018

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“…In contrast, the last 6000 years display clear centennial-and millennial-scale cycles. A number of other studies have identified cyclicity shifts at this time (Fletcher et al, 2013;Jiménez-Espejo et al, 2014;Morley et al, 2014), related to North Atlantic variability, but so far mainly in western Mediterranean records. From 6000 cal yr BP onwards, the geochemical record at Mohos preserves two main cyclicities: one millennial cycle (at ∼ 1200-2000 years) and the second at ∼ 600-800 years (Fig.…”

Section: Periodicitymentioning

confidence: 99%

Periodic input of dust over the Eastern Carpathians during the Holocene linked with Saharan desertification and human impact

et al. 2017

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Abstract. Reconstructions of dust flux have been used to produce valuable global records of changes in atmospheric circulation and aridity. These studies have highlighted the importance of atmospheric dust in marine and terrestrial biogeochemistry and nutrient cycling. By investigating a 10 800-year-long paleoclimate archive from the Eastern Carpathians (Romania) we present the first peat record of changing dust deposition over the Holocene for the CarpathianBalkan region. Using qualitative (X-ray fluorescence (XRF) core scanning) and quantitative inductively coupled plasma optical emission spectrometer(ICP-OES) measurements of lithogenic (K, Si, Ti) elements, we identify 10 periods of major dust deposition between 9500-9200, 8400-8100, 7720-7250, 6350-5950, 5450-5050, 4130-3770, 3450-2850, 2000-1450, 800-620, and 60 cal yr BP to present. In addition, we used testate amoeba assemblages preserved within the peat to infer local palaeohydroclimatic conditions. Our record highlights several discrepancies between eastern and western European dust depositional records and the impact of highly complex hydrological regimes in the Carpathian region. Since 6100 cal yr BP, we find that the geochemical indicators of dust flux have become uncoupled from the local hydrology. This coincides with the appearance of millennial-scale cycles in the dust input and changes in geochemical composition of dust. We suggest that this is indicative of a shift in dust provenance from local-regional (likely loess-related) to distal (Saharan) sources, which coincide with the end of the African Humid Period and the onset of Saharan desertification.

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“…In the Mediterranean basin, the early and mid-Holocene are characterized by enhanced moisture and precipitation increases until ∼ 5000 cal BP (Carrión, 2002;Fletcher et al, 2007;Magny et al, 2012) and are then followed by longterm aridification throughout the region, recorded by many proxies such as palynology, geochemistry, lake levels, semimobile dune systems and Saharan eolian dust (Zazo et al, 2005;Jalut et al, 2009;Pérez-Obiol et al, 2011;Roberts et al, 2011;Jiménez-Espejo et al, 2014;Jiménez-Moreno et al, 2015). This aridification trend has been linked to a decrease in summer insolation which could have resulted in lower sea-surface temperatures, reduced land-sea contrast and, thus, lower precipitation during the fall-winter season (Marchal et al, 2002;Jiménez-Moreno et al, 2015).…”

Section: The Long-term Aridity Trendmentioning

confidence: 99%

Late Holocene vegetation changes in relation with climate fluctuations and human activity in Languedoc (southern France)

et al. 2015

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Abstract. Holocene climate fluctuations and human activity since the Neolithic have shaped present-day Mediterranean environments. Separating anthropogenic effects from climatic impacts to better understand Mediterranean paleoenvironmental changes over the last millennia remains a challenging issue. High-resolution pollen analyses were undertaken on two cores from the Palavasian lagoon system (Hérault, southern France). These records allow reconstruction of vegetation dynamics over the last 4500 years. Results are compared with climatic, historical and archeological archives. A long-term aridification trend is highlighted during the late Holocene, and three superimposed arid events are recorded at 4600-4300, 2800-2400 and 1300-1100 cal BP. These periods of high-frequency climate variability coincide in time with the rapid climatic events observed in the Atlantic Ocean (Bond et al., 2001). From the Bronze Age (4000 cal BP) to the end of the Iron Age (around 2000 cal BP), the spread of sclerophyllous taxa and loss of forest cover result from anthropogenic impact. Classical Antiquity is characterized by a major reforestation event related to the concentration of rural activity and populations in coastal plains leading to forest recovery in the mountains. A major regional deforestation occurred at the beginning of the High Middle Ages. Around 1000 cal BP, forest cover is minimal while the cover of olive, chestnut and walnut expands in relation to increasing human influence. The present-day vegetation dominated by Mediterranean shrubland and pines has been in existence since the beginning of the 20th century.

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Saharan aeolian input and effective humidity variations over western Europe during the Holocene from a high altitude record

Cited by 84 publications

References 142 publications

Holocene climate aridification trend and human impact interrupted by millennial- and centennial-scale climate fluctuations from a new sedimentary record from Padul (Sierra Nevada, southern Iberian Peninsula)

Holocene climate aridification trend and human impact interrupted by millennial- and centennial-scale climate fluctuations from a new sedimentary record from Padul (Sierra Nevada, southern Iberian Peninsula)

Periodic input of dust over the Eastern Carpathians during the Holocene linked with Saharan desertification and human impact

Late Holocene vegetation changes in relation with climate fluctuations and human activity in Languedoc (southern France)

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