In:
Science, American Association for the Advancement of Science (AAAS), Vol. 362, No. 6420 ( 2018-12-14), p. 1293-1297
Abstract:
Paired measurements of 14 C/ 12 C and 230 Th ages from two Hulu Cave stalagmites complete a precise record of atmospheric 14 C covering the full range of the 14 C dating method (~54,000 years). Over the last glacial period, atmospheric 14 C/ 12 C ranges from values similar to modern values to values 1.70 times higher (42,000 to 39,000 years ago). The latter correspond to 14 C ages 5200 years less than calibrated ages and correlate with the Laschamp geomagnetic excursion followed by Heinrich Stadial 4. Millennial-scale variations are largely attributable to Earth’s magnetic field changes and in part to climate-related changes in the oceanic carbon cycle. A progressive shift to lower 14 C/ 12 C values between 25,000 and 11,000 years ago is likely related, in part, to progressively increasing ocean ventilation rates.
Type of Medium:
Online Resource
ISSN:
0036-8075
,
1095-9203
DOI:
10.1126/science.aau0747
Language:
English
Publisher:
American Association for the Advancement of Science (AAAS)
Publication Date:
2018
detail.hit.zdb_id:
128410-1
detail.hit.zdb_id:
2066996-3
detail.hit.zdb_id:
2060783-0
SSG:
11
