Use of 10 Be to Predict Atmospheric 14 C Variations during the Laschamp Excursion
High Sensitivity to Cosmogenic Isotope Production Calculations
Bibliographic Data
| ID | 9246209 |
|---|---|
| Authors | Alexandre Cauquoin, Grant Raisbeck, Jean Jouzel, Didier Paillard (0000-0002-9995-2794) |
| Year | 2014 |
| Volume | 56 |
| Issue | 1 |
| Pages | 67-82 |
| Publication date | 2014-01-01 |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Radiocarbon (JOURNAL) |
| Journal identifiers | ISSN: 0033-8222 • E-ISSN: 1945-5755 |
| Publisher | Cambridge University Press (CUP) (PUBLISHER) |
| DOI | 10.2458/56.16478 |
| OpenAlex | W2144147584 |
| Language | EN |
| Citations received | 1 |
| References cited | 52 |
The Laschamp excursion is a period of reduced geomagnetic field intensity occurring 40.7 ± 1.0 kyr ago. As a consequence, cosmogenic isotope production increased dramatically and its sensitivity to solar activity was enhanced during this period. The latter occurs because a larger fraction of the lower-energy interstellar galactic cosmic-ray particles, normally excluded by the geomagnetic field, is able to reach Earth's atmosphere. This produces a cosmogenic isotope production signal with a significant structure. As high-resolution 10 Be profiles from both Antarctica (EDC) and Greenland (NGRIP-GRIP) during this crucial period are now available, one can use them as input into a box carbon cycle model in order to predict atmospheric 14 C variations due to the Laschamp excursion. For this purpose, 10 Be data are converted into 14 C, using production calculations for the 10 Be- 14 C conversion, after correction for the estimated difference of sensitivity between polar and global 10 Be deposition. Several scenarios of carbon cycle state are simulated, from preindustrial to glacial conditions. Applying two recent cosmogenic isotope production calculations for the 10 Be to 14 C conversion, we found that the resulting atmospheric Δ 14 C variations are very sensitive to which of these two are employed. For example, Δ 14 C amplitude under glacial conditions varies from 260‰ (EDC) and 320‰ (Greenland) to 430‰ (EDC) and 510‰ (Greenland) depending on the formulation used for 10 Be- 14 C conversion
Astrophysics · Atmospheric sciences · Cosmic ray · Cosmogenic nuclide · Earth's magnetic field · Excursion · Glacial period · Isotope · Magnetic field · Meteorology · Nuclear physics · Physics · Geology and Paleoclimatology Research · Geomagnetism and Paleomagnetism Studies · Planetary Science and Exploration · Geology · Paleontology
A 60 000 year Greenland stratigraphic ice core chronology
Oxygen isotope and palaeotemperature records from six Greenland ice‐core stations
C Activity and Global Carbon Cycle Changes over the Past 50,000 Years
Marine-derived 14C calibration and activity record for the past 50,000 years updated from the Cariaco Basin
Macintosh Program performs time‐series analysis
Extremely Large Variations of Atmospheric 14 C Concentration During the Last Glacial Period
Radiocarbon calibration curve spanning 0 to 50,000 years BP based on paired 230Th/234U/238U and 14C dates on pristine corals
Intcal04 Terrestrial Radiocarbon Age Calibration, 0–26 Cal Kyr BP
IntCal13 and Marine13 Radiocarbon Age Calibration Curves 0–50,000 Years cal BP
Carbon Cycle
Solar Modulation Effects in Terrestrial Production of Carbon-14
C Variations Caused by Changes in the Global Carbon Cycle
IntCal09 and Marine09 Radiocarbon Age Calibration Curves, 0-50,000 Years cal BP
| Highly cited | No |
|---|