Evidence from wavelet analysis for a mid-Holocene transition in global climate forcing

Debret, Maxime; Sebag, David; Crosta, Xavier; Massei, Nicolas; Petit, Jean‐Robert; Chapron, Emmanuel; Bout-Roumazeilles, V.

doi:10.1016/j.quascirev.2009.06.005

Cited by 133 publications

(114 citation statements)

References 88 publications

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“…1g), following the shift of the westerly wind belt northwards at c. 5.0 ka (Debret et al 2009), would normally have promoted dry, cooler conditions along the WAP, however, our record shows an increase in glacial ice discharge, particularly after c. 2.5 ka (Fig. 1a).…”

mentioning

confidence: 60%

“…1b). This increased δ 18 O diatom variability also coincided with a mid-Holocene transition in the regulation of Antarctic climate from being dominated by non-cyclic forcing to cyclic internal forcing 14 . An abrupt increase in Peru margin climate variability, at multicentennialscale and recorded in ENSO-sensitive proxies, took place between 5.4-4.6 ka 19 and was ascribed to a combination of the ITCZ moving southwards away from the equator and changes in the source region of the tropical thermocline waters, i.e.…”

mentioning

confidence: 72%

“…S1). Increased upwelling of upper Circumpolar Deepwater (UCDW) onto the continental shelf at this time 14 associated with strong winds in the southern region of the Southern Hemisphere westerlies 15 (Fig. 1g) would have supplied additional warmth to the upper water column making frontal melting the dominant mechanism driving glacial discharge/δ 18 O diatom .…”

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confidence: 99%

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Glacial discharge along the west Antarctic Peninsula during the Holocene

et al. 2013

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Glacial discharge along the west Antarctic Peninsula during the Holocene

et al. 2013

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“…Recent high-resolution foraminiferal-based sea surface temperature reconstructions show that there is a link between Holocene climate fluctuations reconstructed from Northern Hemispheric sediment cores and 1000-year and 2500-year cyclicity of TSI variability (Debret et al 2009;Marchitto et al 2010;Cléroux et al 2012). The covariance between the solar and climate signals is clearly identifiable for the early Holocene (between~9.5 and 7 kyr BP).…”

Section: Centennial To Millennial Scalementioning

confidence: 99%

“…However, the link between TSI and climate is less clear for the Middle to Late Holocene. This might be explained by a decreased power of the 1000-year TSI cycle during the Middle to Late Holocene, or by the overriding influence of thermohaline forcing of the climate (Debret et al 2009).…”

Section: Centennial To Millennial Scalementioning

confidence: 99%

The effects of changing solar activity on climate: contributions from palaeoclimatological studies

Engels

Geel

2012

J. Space Weather Space Clim.

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Natural climate change currently acts in concert with human-induced changes in the climate system. To disentangle the natural variability in the climate system and the human-induced effects on the global climate, a critical analysis of climate change in the past may offer a better understanding of the processes that drive the global climate system. In this review paper, we present palaeoclimatological evidence for the past influence of solar variability on Earth's climate, highlighting the effects of solar forcing on a range of timescales. On a decadal timescale, instrumental measurements as well as historical records show the effects of the 11-year Schwabe cycle on climate. The variation in total solar irradiance that is associated with a Schwabe cycle is only~1 W m À2 between a solar minimum and a maximum, but winter and spring temperatures on the Northern Hemisphere show a response even to this small-scale variability. There is a large body of evidence from palaeoclimatic reconstructions that shows the influence of solar activity on a centennial to millennial timescale. We highlight a period of low solar activity starting at 2800 years before present when Europe experienced a shift to colder and wetter climate conditions. The spatial pattern of climate change that can be recognized in the palaeoclimatological data is in line with the suggested pattern of climate change as simulated by climate models. Millennial-scale climate oscillations can be recognized in sediment records from the Atlantic Ocean as well as in records of lake-level fluctuations in southeastern France. These oscillations coincide with variation in 14 C production as recognized in the atmospheric 14 C record (which is a proxy-record for solar activity), suggesting that Earth's climate is sensitive to changes in solar activity on a millennial timescale as well.

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Assessing millennial-scale variability during the Holocene: A perspective from the western tropical Pacific

2014

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We investigate the relationship between tropical Pacific and Southern Ocean variability during the Holocene using the stable oxygen isotope and magnesium/calcium records of cooccurring planktonic and benthic foraminifera from a marine sediment core collected in the western equatorial Pacific. The planktonic record exhibits millennial-scale sea surface temperature (SST) oscillations over the Holocene of~0.5°C while the benthic δ 18 O c document~0.10‰ millennial-scale changes of Upper Circumpolar Deep Water (UCDW), a water mass which outcrops in the Southern Ocean. Solar forcing as an explanation for millennial-scale SST variability requires (1) a large climate sensitivity and (2) a long 400 year delayed response, suggesting that if solar forcing is the cause of the variability, it would need to be considerably amplified by processes within the climate system at least at the core location. We also explore the possibility that SST variability arose from volcanic forcing using a simple red noise model. Our best estimates of volcanic forcing falls short of reproducing the amplitude of observed SST variations although it produces power at low-frequency similar to that observed in the MD81 record. Although we cannot totally discount the volcanic and solar forcing hypotheses, we are left to consider that the most plausible source for Holocene millennial-scale variability lies within the climate system itself. In particular, UCDW variability coincided with deep North Atlantic changes, indicating a role for the deep ocean in Holocene millennial-scale variability.

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Evidence from wavelet analysis for a mid-Holocene transition in global climate forcing

Cited by 133 publications

References 88 publications

Glacial discharge along the west Antarctic Peninsula during the Holocene

Glacial discharge along the west Antarctic Peninsula during the Holocene

The effects of changing solar activity on climate: contributions from palaeoclimatological studies

Assessing millennial-scale variability during the Holocene: A perspective from the western tropical Pacific

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