High-resolution Holocene climate and hydrological variability from two major Mediterranean deltas (Nile and Rhone)

Jalali, Bassem; Sicre, Marie‐Alexandrine; Kallel, Néjib; Azuara, Julien; Nebout, Nathalie Combourieu; Bassetti, Maria‐Angela; Klein, Vincent

doi:10.1177/0959683616683258

Cited by 24 publications

(22 citation statements)

References 80 publications

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“…(b) TERR-alkane abundances at the INV12-15, CSS00-07, and SW104-ND-14Q cores (this study). (c) Changes in ACL 27-33 in the KSGC-31(Jalali et al, 2017) and KESC9-14 cores (this study). (d) Changes in ACL 27-33 in the INV12-15, CSS00-07, and SW104-ND-14Q cores (this study).…”

mentioning

confidence: 66%

“…The ACL 27-33 values in the Var delta sediments are higher than in the GoL, in agreement with climatic conditions of the catchment of the two rivers (Figure 8c). Indeed, lower ACL 27-33 values in the GoL core reflect the generally more humid conditions in the Upper Rhone River drainage basin (Jalali et al, 2017), reaching outside the Mediterranean climate zone, to a more temperate climate regime to the north (Figure 8c). This is in contrast with the purely Mediterranean drainage basin of the Var River.…”

Section: Hydroclimate and Human Activities In The Central/eastern Andmentioning

confidence: 99%

“…• High-resolution alkenone SSTs and paleoenvironmental conditions time series have been produced from the Northwestern Mediterranean and South Adriatic Sea • Strong spatial heterogeneity of the SST signals highlights local impact of atmospheric and oceanic features • Terrestrial biogenic inputs in the Adriatic Sea underline enhanced erosion in response to human activities over the past 500 years Mediterranean deltas shedding light on climate-driven changes over the Holocene in the two contrasted Nile and Rhone river drainage basins (Jalali et al, , 2017. The Mediterranean basin offers a variety of coastal settings to fully develop this multiproxy approach and expand it to the reconstruction of land-sea transects.…”

Section: 1029/2017pa003298mentioning

confidence: 99%

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Deltaic and Coastal Sediments as Recorders of Mediterranean Regional Climate and Human Impact Over the Past Three Millennia

Jalali

Sicre

Klein

et al. 2018

Paleoceanog and Paleoclimatol

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Deltaic and shallow marine sediments represent unique natural archives to study the evolution of surface coastal ocean water properties as compared to environmental changes in adjacent continents. Sea surface temperatures (SSTs) and higher plant biomarker records were generated from the Rhone and Var River deltaic sediments (NW Mediterranean Sea), and three sites in the South Adriatic Sea (Central/Eastern Mediterranean Sea), spanning all or part of the past three millennia. Because of the high sediment accumulation rates at all core sites, we were able to produce time series at decadal time scale. SSTs in the Gulf of Lion and the convection area of the South Adriatic Sea indicate similar cold mean values (around 17 °C) and pronounced cold spells, reflecting strong wind‐driven surface water heat loss. However, they differ in the rate of postindustrial warming, which is steeper in the Gulf of Lion. The three Adriatic Sea SST records are notably different reflecting different hydrological influence from nearshore to open sea sites. The compositional features of higher plant n‐alkanes in the Rhone and Var delta sediments and inferred vegetation types show differences consistent with the latitudinal extension of the drainage basins of both river streams. In the Adriatic Sea, both coastal and open sea sediments indicate enhanced land‐derived material over the past 500 years, which is not seen in the NW Mediterranean record. We suggest that increased erosion as the result of changes in land use practices is the most likely cause for this trend.

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confidence: 66%

Section: Hydroclimate and Human Activities In The Central/eastern Andmentioning

confidence: 99%

Section: 1029/2017pa003298mentioning

confidence: 99%

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Deltaic and Coastal Sediments as Recorders of Mediterranean Regional Climate and Human Impact Over the Past Three Millennia

Jalali

Sicre

Klein

et al. 2018

Paleoceanog and Paleoclimatol

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“…In the Nile prodelta area, a warmer interval seems to be present in the core MD04-2726 ( Fig. 4i) (Jalali et al, 2017), even if with some Clim. Past Discuss., https://doi.org/10.5194/cp-2018-147 Manuscript under review for journal Clim.…”

Section: The Annual Average Conditionsmentioning

confidence: 94%

The 4.2 ka BP Event in the Mediterranean Region: an overview

Bini¹,

Zanchetta²,

Perşoiu³

et al. 2018

Preprint

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Abstract. The Mediterranean region and the Levant have returned some of the clearest evidence of a climatically dry period occurring around 4200 years ago. However, some regional evidence are controversial and contradictory, and issues remain regarding timing, progression and regional articulation of this event. In this paper we review the evidence from selected proxies (sea-surface temperature, precipitation and temperature reconstructed from pollen, δ18O on speleothems, and δ18O on lacustrine carbonate) over the Mediterranean basin to infer possible regional climate patterns during the interval between 4.3 and 3.8 cal ka BP. The values and limitations of these proxies are discussed, and their potential for furnishing information on seasonality is also explored. Despite the chronological uncertainties, which are the main limitations for disentangling details of the climatic conditions, the data suggests that winter over the Mediterranean was drier condition, in addition to already dry summers. However, some exceptions to this prevail, – where wetter condition seems to have persisted – suggesting regional heterogeneity in climate patterns. Temperature data, even if sparse, also suggest a cooling anomaly, even if this is not uniform. The most common paradigm to interpret the precipitation regime in the Mediterranean – a North Atlantic Oscillation-like pattern – is not completely satisfactory to interpret the selected data.

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“…The fraction of the riverine input in coastal areas is usually much higher compared to the aeolian input. Therefore, terrestrial n-alkane concentrations have already been successfully applied to study the riverine input in coastal settings in the Mediterranean (Abrantes et al, 2017;Cortina et al, 2016;Jalali et al, 2016;Jalali et al, 2017). More specifically,…”

Section: Proxy Restrictionsmentioning

confidence: 99%

Multi-decadal climate variability in southern Iberia during the mid- to late-Holocene

Schirrmacher

Weinelt

Blanz

et al. 2018

Preprint

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Abstract. To assess the regional multi-decadal to multi-centennial climate variability at the southern Iberian Peninsula during the mid- to late- Holocene transition multi-proxy records of two marine sediment cores were established for two sites in the Alboran Sea (ODP-161-976A) and the Gulf of Cadiz (GeoB5901-2). High-resolution records of organic geochemical proxies and planktic foraminiferal assemblages are used to decipher precipitation and vegetation changes as well as the sea surface conditions with respect to Sea Surface Temperature (SST) and marine primary productivity (MPP). n-Alkane records as a proxy for precipitation changes suggest a series of six distinct drought events at 5.4 ka BP, from ca. 5.1 ka BP to 4.9 ka BP, from 4.8 to 4.7 ka BP, at 4.6 ka BP, from 4.4 to 4.3 ka BP and, from 3.8 to 3.7 ka BP. Each drought event is associated with a major vegetation change towards higher proportions of C4 vegetation. The drought events are further accompanied by annual and spring/ winter SST warming as well as decreasing MPP in the Alboran Sea. Altogether, the close correlation of the observed droughts with North Atlantic Oscillation (NAO)-like variability suggests changes in the atmospheric circulation as important driving mechanism of terrestrial and oceanic variability at southern Iberia and the Alboran Sea, respectively. Sea surface variability in the Gulf of Cadiz, instead, is intimately linked to the North Atlantic Bond Events. In particular, during Bond Events 3 and 4 a pronounced increase in seasonality is found.

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High-resolution Holocene climate and hydrological variability from two major Mediterranean deltas (Nile and Rhone)

Abstract: International audienc

Cited by 24 publications

References 80 publications

Deltaic and Coastal Sediments as Recorders of Mediterranean Regional Climate and Human Impact Over the Past Three Millennia

Deltaic and Coastal Sediments as Recorders of Mediterranean Regional Climate and Human Impact Over the Past Three Millennia

The 4.2 ka BP Event in the Mediterranean Region: an overview

Multi-decadal climate variability in southern Iberia during the mid- to late-Holocene

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