Cyclic Variation and Solar Forcing of Holocene Climate in the Alaskan Subarctic

Hu, Feng Sheng; Kaufman, Darrell S.; Yoneji, Sumiko; Nelson, David M.; Shemesh, Aldo; Huang, Yongsong; Tian, Jie; Bond, Gérard C.; Clegg, Benjamin F.; Brown, Thomas A.

doi:10.1126/science.1088568

Cited by 311 publications

(202 citation statements)

References 40 publications

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“…There appears to be an increasing amount of evidence for solar forcing of climate change and associated additional warming by feedback (Bond et al, 2001;Hu et al, 2003;Maasch et al, 2005;Mauquoy et al, 2002;van Geel et al, 1999, 2004, Versteegh, 2005Xiao et al, 2006). We emphasize that the apparently large sensitivity of the climate system to small changes in solar activity confirms the importance of amplifying feedback processes in the climate system (Boni et al, 2006;Murphy et al, 2009).…”

Section: Discussionmentioning

confidence: 69%

Quantifying and specifying the solar influence on terrestrial surface temperature

Jager

Duhau

Geel

2010

Journal of Atmospheric and Solar-Terrestrial Physics

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This 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. b s t r a c tThis investigation is a follow-up of a paper in which we showed that both major magnetic components of the solar dynamo, viz. the toroidal and the poloidal ones, are correlated with average terrestrial surface temperatures. Here, we quantify, improve and specify that result and search for their causes. We studied seven recent temperature files. They were smoothed in order to eliminate the Schwabe-type (11 years) variations. While the total temperature gradient over the period of investigation (1610-1970) is 0.087 1C/century; a gradient of 0.077 1C/century is correlated with the equatorial (toroidal) magnetic field component. Half of it is explained by the increase of the Total Solar Irradiance over the period of investigation, while the other half is due to feedback by evaporated water vapour. A yet unexplained gradient of À 0.040 1C/century is correlated with the polar (poloidal) magnetic field. The residual temperature increase over that period, not correlated with solar variability, is 0.051 1C/century. It is ascribed to climatologic forcings and internal modes of variation.We used these results to study present terrestrial surface warming. By subtracting the above-mentioned components from the observed temperatures we found a residual excess of 0.311 in 1999, this being the triangularly weighted residual over the period 1990-2008. We show that solar forcing of the ground temperature associated with significant feedback is a regularly occurring feature, by describing some well observed events during the Holocene.

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Section: Discussionmentioning

confidence: 69%

Quantifying and specifying the solar influence on terrestrial surface temperature

Jager

Duhau

Geel

2010

Journal of Atmospheric and Solar-Terrestrial Physics

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“…Cumming et al (2002) reported on persistent millennial-scale effects on moisture availability recorded at Big Lake, BC, in the semi-arid Cariboo region, some 500 km south of the Bear Lake site. It is also important to note recent studies, such as those of cyclic variations in an Alaskan lake, reported by Hu et al (2003), which suggest millennial-scale periodicity. In other records from the northwestern USA, Whitlock et al (2003) summarized the fire records observed in lake sediments from a number of lakes at 40-45°N.…”

Section: Discussionmentioning

confidence: 99%

Over 16,000 Years of Fire Frequency Determined from AMS Radiocarbon Dating of Soil Charcoal in an Alluvial Fan at Bear Flat, Northeastern British Columbia

Jull

Geertsema²

2006

Radiocarbon

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ABSTRACT. We present results of radiocarbon dating of charcoal from paleosols and buried charcoal horizons in a unique sequence, which potentially records the last 36,000 yr, from a fan at Bear Flat, British Columbia (BC) (56°16′51″N, 121°13′39″W). Evidence for forest-fire charcoal is found over the last 13,500 ± 110 14 C yr before present (BP) or 16,250 ± 700 cal BP. The study area is located east of the Rocky Mountains in an area that was ice-free at least 13,970 ± 170 14 C yr BP (17,150 cal BP) ago. The latest evidence of fire is during the Medieval Warm Period (MWP). The charcoal ages show a periodicity in large fires on a millennial scale through the Holocene-an average of 4 fires per thousand years. Higher fire frequencies are observed between 2200 to 2800 cal BP, ~5500 and ~6000 cal BP, ~7500 to 8200 cal BP, and 9000 to 10,000 cal BP. These intervals also appear to be times of above-average aggradation of the fan. We conclude that fire frequency is related to large-scale climatic events on a millennial time scale.

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“…Previous Holocene studies suggest that small variations in solar activity could have produced changes in the atmospheric dynamics at millennial-, centennial-and decadal-scales (e.g., Bard et al, 2000;Bond et al, 2001;Hu et al, 2003;Martín-Puertas et al, 2012). Times series analysis on the BdlC-01 record reveals centennial-scale periodicities around ca.…”

Section: Centennial-scale Vegetation Solar and Atmospheric Changesmentioning

confidence: 99%

Centennial-scale vegetation and North Atlantic Oscillation changes during the Late Holocene in the southern Iberia

Ramos‐Román

Jiménez‐Moreno

Anderson

et al. 2016

Quaternary Science Reviews

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Highlights1. We studied a late Holocene vegetation and fire record from southern Spain.2. A long-term aridification trend is observed, interrupted by shorter-scale variability.3. This study shows humidity changes during the last 4500 yr, related to NAO changes and solar variability. AbstractHigh-resolution pollen analysis, charcoal, non-pollen palynomorphs and magnetic susceptibility have been analyzed in the sediment record of a peat bog in Sierra Nevada in southern Iberia. The study of these proxies provided the reconstruction of vegetation, 2 climate, fire and human activity of the last ~4500 cal yr BP. A progressive trend towards aridification during the late Holocene is observed in this record. This trend is interrupted by millennial-and centennial-scale variability of relatively more humid and arid periods. Arid conditions are recorded between ~4000 to 3100 cal yr BP, being characterized by a decline in arboreal pollen and with a spike in magnetic susceptibility. This is followed by a relatively humid period from ~3100 to 1600 cal yr BP, coinciding partially with the Iberian-Roman Humid Period, and is indicated by the increase of

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Cyclic Variation and Solar Forcing of Holocene Climate in the Alaskan Subarctic

Cited by 311 publications

References 40 publications

Quantifying and specifying the solar influence on terrestrial surface temperature

Quantifying and specifying the solar influence on terrestrial surface temperature

Over 16,000 Years of Fire Frequency Determined from AMS Radiocarbon Dating of Soil Charcoal in an Alluvial Fan at Bear Flat, Northeastern British Columbia

Centennial-scale vegetation and North Atlantic Oscillation changes during the Late Holocene in the southern Iberia

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