The Impact of the Little Ice Age on Coccolithophores in the Central Mediterranea Sea

Incarbona, Alessandro; Ziveri, Patrizia; Stefano, Enrico Di; Lirer, Fabrizio; Mortyn, P. Graham; Patti, B.; Pelosi, Nicola; Sprovieri, Mario; Tranchida, Giorgio; Vallefuoco, Mattia; Albertazzi, S.; Bellucci, Luca Giorgio; Bonanno, A.; Bonomo, Sergio; Censi, P.; Ferraro, Luciana; Giuliani, Silvia; Mazzola, S.; Sprovieri, Rodolfo

doi:10.5194/cp-6-795-2010

Cited by 41 publications

(24 citation statements)

References 71 publications

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“…Thus, increased fluvial input along with oceanographic oscillations may have also promoted enhanced productivity, as suggested by greater TOC values and organometallic ligands. Indeed, similar increase in productivity is also recognized during the LIA as far as the Sicily Channel, as evidenced by coccolithophore records by Incarbona et al (2010).…”

Section: The Little Ice Age (Lia) (∼650-150 Cal Yr Bp)mentioning

confidence: 77%

Tracking climate variability in the western Mediterranean during the Late Holocene: a multiproxy approach

et al. 2011

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Abstract. Climate variability in the western Mediterranean is reconstructed for the last 4000 yr using marine sediments recovered in the west Algerian-Balearic Basin, near the Alboran Basin. Fluctuations in chemical and mineralogical sediment composition as well as grain size distribution are linked to fluvial-eolian oscillations, changes in redox conditions and paleocurrent intensity. Multivariate analyses allowed us to characterize three main groups of geochemical and mineralogical proxies determining the sedimentary record of this region. These three statistical groups were applied to reconstruct paleoclimate conditions at high resolution during the Late Holocene. An increase in riverine input (fluvial-derived elements -Rb/Al, Ba/Al, REE/Al, Si/Al, Ti/Al, Mg/Al and K/Al ratios), and a decrease in Saharan eolian input (Zr/Al ratio) depict the Roman Humid Period and the Little Ice Age, while drier environmental conditions are recognized during the Late Bronze Age-Iron Age, the Dark Ages and the Medieval Climate Anomaly. Additionally, faster bottom currents and more energetic hydrodynamic conditions for the former periods are evidenced by enhanced sortable silt (10-63 µm) and quartz content, and by better oxygenated bottom waters -as reflected by decreasing redox-sensitive elements (V/Al, Cr/Al, Ni/Al and Zn/Al ratios). In contrast, opposite paleoceanographic conditions are distinguished during the latter periods, i.e. the Late Bronze Age-Iron Age, the Dark Ages and the Medieval Climate Anomaly. Although no Ba excess was registered, other paleoproductivity indicators Correspondence to: V. Nieto-Moreno (vanesanieto@ugr.es) (total organic carbon content, Br/Al ratio, and organometallic ligands such as U and Cu) display the highest values during the Roman Humid Period, and together with increasing preservation of organic matter, this period exhibits by far the most intense productivity of the last 4000 yr. Fluctuations in detrital input into the basin as the main process managing deposition, reflected by the first eigenvector defined by the Principal Component Analyses, point to solar irradiance and the North Atlantic Oscillation variability as the main driving mechanisms behind natural climate variability over decadal to centennial time-scales for the last 4000 yr.

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Section: The Little Ice Age (Lia) (∼650-150 Cal Yr Bp)mentioning

confidence: 77%

Tracking climate variability in the western Mediterranean during the Late Holocene: a multiproxy approach

et al. 2011

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“…This includes studies on isotopes (e.g. Cini Castagnoli et al, 2005; Taricco et al, 2009), pollen (Di Rita, 2011), nannoplankton (Incarbona et al, 2010) and multi-proxy-data sets (Garcin et al, 2006). Still, aside from the better understood 11-year sunspot-cycle and the 22-year Hale-cycle, the origin of other cyclic variations in the sun's emitted energy remains unsolved (Versteegh, 2005).…”

Section: Introductionmentioning

confidence: 99%

High-resolution analysis of upper Miocene lake deposits: Evidence for the influence of Gleissberg-band solar forcing

Kern

Harzhauser

Soliman

et al. 2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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A high-resolution multi-proxy analysis was conducted on a 1.5-m-long core of Tortonian age (~ 10.5 Ma; Late Miocene) from Austria (Europe). The lake sediments were studied with a 1-cm resolution to detect all small-scale variations based on palynomorphs (pollen and dinoflagellate cysts), ostracod abundance, geochemistry (carbon and sulfur) and geophysics (magnetic susceptibility and natural gamma radiation). Based on an already established age model for a longer interval of the same core, this sequence can be limited to approx. two millennia of Late Miocene time with a resolution of ~ 13.7 years per sample. The previous study documented the presence of solar forcing, which was verified within various proxies on this 1.5-m core by a combination of REDFIT spectra and Gaussian filters. Significant repetitive signals ranged in two discrete intervals corresponding roughly to 55–82 and 110–123 years, fitting well within the lower and upper Gleissberg cycle ranges.Based on these results, the environmental changes along the 2000-year Late Miocene sequence are discussed. No major ecological turnovers are expected in this very short interval. Nonetheless, even within this brief time span, dinoflagellates document rapid changes between oligotrophic and eutrophic conditions, which are frequently coupled with lake stratification and dysoxic bottom waters. These phases prevented ostracods and molluscs from settling and promoted the activity of sulfur bacteria. The pollen record indicates rather stable wetland vegetation with a forested hinterland. Shifts in the pollen spectra can be mainly attributed to variations in transport mechanisms. These are represented by a few phases of fluvial input but mainly by changes in wind intensity and probably also wind direction. Such influence is most likely caused by solar cycles, leading to a change in source area for the input into the lake.Furthermore, these solar-induced variations seem to be modulated by longer solar cycles. The filtered data display comparable patterns and modulations, which seem to be forced by the 1000-year and 1500-year cycles. The 1000-year cycle modulated especially the lake surface proxies, whereas the 1500-year cycle is mainly reflected in hinterland proxies, indicating strong influence on transport mechanisms.

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“…In order to refine the palaeoecological interpretation, taxa were grouped into 'placoliths', 'miscellaneous group', 'upper photic zone (UPZ) group' and 'lower photic zone (LPZ) group' following Young (1994), Di Stefano and Incarbona (2004) and Incarbona et al (2010bIncarbona et al ( , 2011. Placoliths included E. huxleyi, small Gephyrocapsa, Gephyrocapsa muellerae, Gephyrocapsa oceanica and small placoliths.…”

Section: Coccolith Assemblagesmentioning

confidence: 99%

Mediterranean coccolith ecobiostratigraphy since the penultimate Glacial (the last 145,000years) and ecobioevent traceability

Stefano

Foresi

Incarbona

et al. 2015

Marine Micropaleontology

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The Impact of the Little Ice Age on Coccolithophores in the Central Mediterranea Sea

Cited by 41 publications

References 71 publications

Tracking climate variability in the western Mediterranean during the Late Holocene: a multiproxy approach

Tracking climate variability in the western Mediterranean during the Late Holocene: a multiproxy approach

High-resolution analysis of upper Miocene lake deposits: Evidence for the influence of Gleissberg-band solar forcing

Mediterranean coccolith ecobiostratigraphy since the penultimate Glacial (the last 145,000years) and ecobioevent traceability

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