Comment on “A Large California Flood and Correlative Global Climatic Events 400 Years Ago” (Schimmelmann<i>et al.,</i>1998)

Geel, B. van; Plicht, van der Johannes; Renssen, H.

doi:10.1006/qres.1998.2012

Cited by 12 publications

(10 citation statements)

References 13 publications

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“…660 and 650 BC). – This wet‐shift – very clear in both Rystad cores – occurs at the end of a pronounced residual Δ 14 C peak called the ‘Homerian (Δ 14 C) maximum’ (van Geel et al . 1999a, b), c .…”

Section: Resultsmentioning

confidence: 98%

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Climate changes during the last c. 7500 years as recorded by the degree of peat humification in the Lofoten region, Norway

Vorren¹,

Jensen²,

Nilssen³

2011

Boreas

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Vorren, K.‐D., Jensen, C. E. & Nilssen, E. 2012 (January): Climate changes during the last c. 7500 years as recorded by the degree of peat humification in the Lofoten region, Norway. Boreas, Vol. 41, pp. 13–30. 10.1111/j.1502‐3885.2011.00220.x. ISSN 0300‐9483. Two peat cores from two neighbouring bogs in Lofoten, northern Norway were densely AMS dated and analysed for humification. The two cores have been influenced by human agricultural impact, especially c. 1600 cal. a BP, which may have affected the local hydrology of the bogs. From 7400 cal. a BP onwards, 19 distinct wet‐shifts are recorded in the two cores. Eight or nine of these correspond chronologically to periods of low solar activity. This correlation is most convincing during the last 2000 years. Some wet‐shifts are connected with a solar low‐activity period during the Subboreal/Subatlantic transition, which in central Europe is dated at 2750–2565 cal. a BP. For Lofoten, the corresponding Subboreal/Subatlantic transition – or the wet‐shift marking this transition – is dated at c. 2600 cal. a BP. Some wet‐shifts occur just before or just after solar low‐activity periods, but only four of the nineteen wet‐shifts are clearly not temporally connected with periods of low solar activity. Compared with the wet‐shifts in NW European (mainly British Isles) bogs, there are more frequent wet‐shifts in northern Norway. Compared with other peat cores in northern Norway, especially for the interval 6500–5000 cal. a BP, Lofoten deviates by its lack of wet‐shifts. As in England, Scotland and Ireland, there is regional variability in the temporal formation of wet‐shifts in northern Norway.

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Section: Resultsmentioning

confidence: 98%

“…Van Geel et al . (1999a, b, 2001) have made an essential contribution to the discussion over which driving forces determine the climate changes detected in the wet‐shifts in mire stratigraphy.…”

mentioning

confidence: 99%

Climate changes during the last c. 7500 years as recorded by the degree of peat humification in the Lofoten region, Norway

Vorren¹,

Jensen²,

Nilssen³

2011

Boreas

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“…The best known example is the Maunder Minimum (1645-1715), a solar event that is coinciding with one of the coldest phases of the Little Ice Age (Eddy, 1976; see also van Geel et al, 1998b). The Maunder Minimum is characterised by a minimum in sunspots, as recorded by observers.…”

Section: Be Changes and Climate Changementioning

confidence: 99%

The role of solar forcing upon climate change

Geel

Raspopov

Renssen³

et al. 1999

Quaternary Science Reviews

265

110

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Evidence for millennial-scale climate changes during the last 60,000 years has been found in Greenland ice cores and North Atlantic ocean cores. Until now, the cause of these climate changes remained a matter of debate. We argue that variations in solar activity may have played a significant role in forcing these climate changes. We review the coincidence of variations in cosmogenic isotopes (C and Be) with climate changes during the Holocene and the upper part of the last Glacial, and present two possible mechanisms (involving the role of solar UV variations and solar wind/cosmic rays) that may explain how small variations in solar activity are amplified to cause significant climate changes. Accepting the idea of solar forcing of Holocene and Glacial climatic shifts has major implications for our view of present and future climate. It implies that the climate system is far more sensitive to small variations in solar activity than generally believed.

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“…4e) and the Holocene (where no DO events occurred). Its origin is still debated, with solar variability being a prime suspect [20]. Figure 3d shows the outcome of this model experiment.…”

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confidence: 92%

Abrupt Glacial Climate Changes due to Stochastic Resonance

2002

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Using an ocean-atmosphere climate model we demonstrate that stochastic resonance could be an important mechanism for millennial-scale climate variability during glacial times. We propose that the glacial ocean circulation, unlike today's, was an excitable system with a stable and a weakly unstable mode of operation, and that a combination of weak periodic forcing and plausible-amplitude stochastic fluctuations of the freshwater flux into the northern North Atlantic can produce glacial warm events similar in time evolution, amplitude, spatial pattern, and interspike intervals to those found in the observed climate records.

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Comment on “A Large California Flood and Correlative Global Climatic Events 400 Years Ago” (Schimmelmannet al.,1998)

Cited by 12 publications

References 13 publications

Climate changes during the last c. 7500 years as recorded by the degree of peat humification in the Lofoten region, Norway

Climate changes during the last c. 7500 years as recorded by the degree of peat humification in the Lofoten region, Norway

The role of solar forcing upon climate change

Abrupt Glacial Climate Changes due to Stochastic Resonance

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