Analysis of the atmospheric 14C record spanning the past 50,000 years derived from high-precision 230Th/234U/238U, 231Pa/235U and 14C dates on fossil corals

Chiu, Tz-Cheng; Fairbanks, Richard G.; Cao, Li; Mortlock, Richard A.

doi:10.1016/j.quascirev.2006.06.015

Cited by 39 publications

(33 citation statements)

References 74 publications

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“…Inaccuracies in the construction of chronologies can stem from a number of issues, including the chronological and glaciological models used, layer counting, and the temporal difference between dated tie points (Chiu et al, 2007;cf. Hughen et al, 2004; also see Chapter 3).…”

Section: Ice Core Chronologiesmentioning

confidence: 99%

“…Hughen et al, 2004; also see Chapter 3). For example, the Cariaco core (ODP1002) had an estimated calendar chronology based on correlation of visually-identified stratigraphy with GISP2 18 O record (Chiu et al, 2007). The application of various other…”

Section: Ice Core Chronologiesmentioning

confidence: 99%

“…Inherited uncertainties have the potential of generating an artificial radiocarbon trend, resulting in distortions that affect the shape and amplitude of this record [ Figure 2.13] (Chiu et al, 2007). This figure shows the sensitivity of the 14 C record to these distortions, where chronological tie points in the ice-core were used to correlate the two cores.…”

Section: Ice Core Chronologiesmentioning

confidence: 99%

“…Chronological issues specific to absolute dating using radioactive isotopes also need to be taken into consideration (Chiu et al, 2007;see Section 3.2). Attempts to address these issues are ongoing such as the INTCAL calibration efforts that include the Fairbanks calibration curve (Chiu et al, 2007;Fairbanks et al, 2005), and the development of other glaciological chronologies such as the Greenland-Cariaco chronology that are tied to uranium-series dating using high quality coral records (Cooper et al, 2015).…”

Section: Ice Core Chronologiesmentioning

confidence: 99%

“…Attempts to address these issues are ongoing such as the INTCAL calibration efforts that include the Fairbanks calibration curve (Chiu et al, 2007;Fairbanks et al, 2005), and the development of other glaciological chronologies such as the Greenland-Cariaco chronology that are tied to uranium-series dating using high quality coral records (Cooper et al, 2015). To understand the potential causes of these discrepancies and the ability of these chronologies to assess the existence of the 1500-yr cycle, it is also important to understand how these chronologies are structured and factors affecting them (see Section 3.2).…”

Section: Ice Core Chronologiesmentioning

confidence: 99%

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Astronomical forcing of sub-Milankovitch climate oscillations during the late Quaternary

Kelsey¹

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A climate signal of ~1500-yr quasi-periodicity (e.g., Bond events) has been found from the Arctic to Antarctica, in palaeoclimatic data derived from a range of environmental proxy records. Solar and lunar forcing have individually been suggested as the cause of this millennial-scale signal, although some contend that it is little more than stochastic resonance within the climate system. Also debated is whether this climate signal is forced by the ocean-atmosphere dynamics of the North Atlantic or the tropical Pacific, as well as relevant climatic teleconnections. The cause of this cycle is elusive as no known solar cycle of this length exists, whilst forcing due to lunar gravitation has been dismissed as being too weak.The most likely cause of any periodic climate signal is an astronomical one, as demonstrated in Milankovitch cycles. This thesis explores a potential astronomical cause of millennial-and centennial-scale periodicities and variability, based on a combination of solar and lunar forcing.Conceptual and trigonometric models, physical models of insolation, solar irradiance, and gravitation, and astronomical data were used in this exploration. Identified as a possible cause of the ~1500-yr climate cycle is precession. Precession changes the timing of Earth's seasons relative to our calendar and external reference points, such as the fixed stars and the closest point in Earth's orbit to the Sun

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Section: Ice Core Chronologiesmentioning

confidence: 99%

Section: Ice Core Chronologiesmentioning

confidence: 99%

Section: Ice Core Chronologiesmentioning

confidence: 99%

Section: Ice Core Chronologiesmentioning

confidence: 99%

Section: Ice Core Chronologiesmentioning

confidence: 99%

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Astronomical forcing of sub-Milankovitch climate oscillations during the late Quaternary

Kelsey¹

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Fire and drought as drivers of early Holocene tree line changes in the Peruvian Andes

Urrego

Niccum

Drew

et al. 2011

J Quaternary Science

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Three pollen and charcoal records from three lakes lying at 3400 m elevation in southern Peru provided a record of landscape change spanning the last ca.18 000 cal. a BP. The tree line lay close to the site between ca. 16 000 and 12 000 cal. a BP, with Polylepis woodlands growing near the lakes. Progressively drying conditions led to increased fire after 12 000 cal. a BP, coinciding with a decline in Polylepis cover and Andean forest relicts as puna grasslands expanded. A strong decrease in the rate of sediment deposition between ca. 12 000 and ca. 4400 cal. a BP was interpreted to indicate the presence of sedimentary hiatuses. With the return of wet conditions after 4400 cal. a BP, forests did not reassemble around the lakes. Instead, fire-maintained grasslands dominated the landscape. Humans probably induced the intensified fire activity during the late Holocene and thereby deflected local successions. The modern fragmented landscape, with Polylepsis woodlands existing in fire-resistant pockets above the general limit of the Andean tree line, resulted from the intensification of human land use practices during the last 4400 cal. a BP.

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Time-Dependent Nuclear Decay Parameters: New Evidence for New Forces?

Fischbach¹,

Buncher²,

Gruenwald³

et al. 2009

Probing the Nature of Gravity

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Analysis of the atmospheric 14C record spanning the past 50,000 years derived from high-precision 230Th/234U/238U, 231Pa/235U and 14C dates on fossil corals

Abstract: Changes in the geomagnetic field intensity, solar variability, and the internal changes of the carbon cycle are believed to be the three controlling factors of past atmospheric radiocarbon ( 14 C) concentrations (denoted as D 14 C

Cited by 39 publications

References 74 publications

Astronomical forcing of sub-Milankovitch climate oscillations during the late Quaternary

Astronomical forcing of sub-Milankovitch climate oscillations during the late Quaternary

Fire and drought as drivers of early Holocene tree line changes in the Peruvian Andes

Time-Dependent Nuclear Decay Parameters: New Evidence for New Forces?

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