Unusual activity of the Sun during recent decades compared to the previous 11,000 years

Solanki, S. K.; Usoskin, Ilya; Kromer, Bernd; Schüßler, M.; Beer, J.

doi:10.1038/nature02995

Cited by 842 publications

(766 citation statements)

References 25 publications

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“…Solar activity is high but decreasing during this period. Afterwards, solar activity is low during the Dalton minimum (until c. AD 1820) which has high Δ 14 C and 14 C productivity (Masarik and Beer, 1999;McCracken et al, 2004;Reimer et al, 2004;Muscheler et al, 2007) and low number of sunspots (Solanki et al, 2004). During this period winter precipitation increases and summer temperatures drop.…”

Section: Mire Surface Wetness Climate Change and Human Impactmentioning

confidence: 99%

“…The period from AD 1960-1980 was relatively dry and warm, especially with dry summer conditions and a very dry summer at 1976. As a consequence it is possible that the mire (Masarik and Beer, 1999;Muscheler et al, 2007) and sunspot number (Solanki et al, 2004). surface desiccated and peat accumulation slowed down or ceased.…”

Section: Mire Surface Wetness Climate Change and Human Impactmentioning

confidence: 99%

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Effects of human impact and climate change during the last 350 years recorded in a Swedish raised bog deposit

Linden

Vickery

Charman

et al. 2008

Palaeogeography, Palaeoclimatology, Palaeoecology

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Effects of human impact and climate change during the last 350 years recorded in a Swedish raised bog deposit van der Linden, M.; Vickery, E.; Charman, D.J.; van Geel, B. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Download date: 10 May 2018This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. AbstractA peat core from an ombrotrophic mire in central Sweden was analysed for multi-proxy indicators (plant macrofossils, pollen/non-pollen microfossils, testate amoebae, colorimetric humification, carbon/nitrogen ratios, bulk densities, loss on ignition), to evaluate the relative contributions of climate change and human impact on vegetation and peat accumulation during the last c. 350 years. 14 C wiggle-match dating was applied for high precision dating. Testate amoebae assemblages were used to reconstruct past water table depths and compared with other proxies and instrumental climate data from the mid-18th century onwards. Changes in mire surface wetness were mainly caused by climate change (precipitation and evaporation), but the internal dynamics of the local bog vegetation may also have played a role in the recorded water table changes. The human impact signal in the pollen data was compared with Swedish population and land-use data. A link between climate change, human impact (openness of the vegetation) and demographic change was found. Cold and wet periods show a decrease in human impact and open land indicators in the pollen data, followed by an increase in death rate and/or an increase in emigration.

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Section: Mire Surface Wetness Climate Change and Human Impactmentioning

confidence: 99%

Section: Mire Surface Wetness Climate Change and Human Impactmentioning

confidence: 99%

Effects of human impact and climate change during the last 350 years recorded in a Swedish raised bog deposit

Linden

Vickery

Charman

et al. 2008

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…To evaluate human impact and natural (essentially climatic) forcing on the silting, we considered the historical data at the Iberian and regional (drainage basin) scales, as well as temperature-inferred data to the north-western Iberia, in the context of larger-scale global trends of temperature and solar activity (Eddy, 1988;Stuiver et al, 1998;Mann et al, 1999;Solanki et al, 2004). The Holocene climate of north-western Iberia, presumably similar to the prevailing in the focused area, was recently characterised by Martı´nez-Cortizas et al (1999) which studied mercury accumulation, and by Desprat et al (2003) using pollen data.…”

Section: Methods and Data Sourcesmentioning

confidence: 99%

Natural to anthropogenic forcing in the Holocene evolution of three coastal lagoons (Caldas da Rainha valley, western Portugal)

Dinis

Henriques

Freitas

et al. 2006

Quaternary International

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In the coast of Central Portugal three lagoons were created by the Holocene flooding of diapiric-related depressions but experienced afterwards a significant sediment accumulation. Fast environmental and morphological changes after the Middle Holocene were clearly forced by anthropogenic activities since the Middle Ages and show a strong feedback on the human communities. Erosion in the studied watersheds depends on climatic and anthropic changes; especially, demographic rises increase agriculture and deforestation in the watersheds, and sedimentation in the lagoons. The region was successively occupied by ethnic groups since the Neolithic (including Romans, Sueves, Visigoths and Muslims), but the main changes were largely due to anthropic forcing following the Christian Reconquest by the Kingdom of Portugal. In fact, during the Middle Ages and Renaissance the area had intense nautical, fishing and agricultural activities, even if reduced during the 14th century crisis. Later, due to severe sediment accumulation and shoaling, sailing was drastically reduced and most of the area drowned in the maximum transgression was claimed to farming. It is also noteworthy that the social evolution and sediment entrainment in the watersheds appear to be in tune with climatic trends deduced after regional and global data. In synthesis, we conclude that the human activities during the last millennium greatly accelerated the natural silting trend of the lagoons. r

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“…This is confirmed by the results for the Lyapunov exponent spectrum which are shown at the right panel in Figure 2. The synthetic SSN data (Solanki et al, 2004) shows no exponential dynamics on the long-time scale. Dynamo models have it on the short-time scale but lose on the long-time scale.…”

Section: The Correlation Dimension and Lyapunov Exponentsmentioning

confidence: 99%

Waldmeier relations and the solar cycle dynamics by the mean-field dynamos

Пипин¹,

Sokoloff²,

Usoskin³

2012

Proc. IAU

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Abstract. The long-term variability of the sunspot cycle, as recorded by the Wolf numbers, are imprinted in different kinds of statistical relations which relate the cycle amplitudes, duration and shapes. This subject always gets a special attention because it is important for the solar activity forecast. We discuss statistical properties of the mean-field dynamo model with the fluctuating α-effect. Also, we estimate dynamical properties of the model for the long and short time-scale and compare it with the dynamics of the sunspot numbers data sets.Keywords. Solar activity, Sun: magnetic field

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Unusual activity of the Sun during recent decades compared to the previous 11,000 years

Cited by 842 publications

References 25 publications

Effects of human impact and climate change during the last 350 years recorded in a Swedish raised bog deposit

Effects of human impact and climate change during the last 350 years recorded in a Swedish raised bog deposit

Natural to anthropogenic forcing in the Holocene evolution of three coastal lagoons (Caldas da Rainha valley, western Portugal)

Waldmeier relations and the solar cycle dynamics by the mean-field dynamos

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