scholarly journals An experimental set-up for carbon isotopic analysis of atmospheric CO 2 and an example of ecosystem response during solar eclipse 2010

2013 ◽  
Vol 122 (3) ◽  
pp. 623-638 ◽  
Author(s):  
TANIA GUHA ◽  
PROSENJIT GHOSH
Keyword(s):  
Solar Eclipse ◽  
Isotopic Analysis ◽  
Ecosystem Response ◽  
Carbon Isotopic ◽  
Set Up

scholarly journals Isotopic Evidence for Long-Distance Connections of the AD Thirteenth-Century Promontory Caves Occupants

2021 ◽  
pp. 1-23
Author(s):  
Jessica Z. Metcalfe ◽  
John W. Ives ◽  
Sabrina Shirazi ◽  
Kevin P. Gilmore ◽  
Jennifer Hallson ◽  
...  
Keyword(s):  
Material Culture ◽  
Thirteenth Century ◽  
Isotopic Analysis ◽  
Bone Collagen ◽  
Turnover Rates ◽  
Long Distance ◽  
Carbon Isotopic ◽  
Local Plant ◽  
Northern Utah ◽  
C Value

The Promontory caves (Utah) and Franktown Cave (Colorado) contain high-fidelity records of short-term occupations by groups with material culture connections to the Subarctic/Northern Plains. This research uses Promontory and Franktown bison dung, hair, hide, and bone collagen to establish local baseline carbon isotopic variability and identify leather from a distant source. The ankle wrap of one Promontory Cave 1 moccasin had a δ13C value that indicates a substantial C4 component to the animal's diet, unlike the C3 diets inferred from 171 other Promontory and northern Utah bison samples. We draw on a unique combination of multitissue isotopic analysis, carbon isoscapes, ancient DNA (species and sex identification), tissue turnover rates, archaeological contexts, and bison ecology to show that the high δ13C value was not likely a result of local plant consumption, bison mobility, or trade. Instead, the bison hide was likely acquired via long-distance travel to/from an area of abundant C4 grasses far to the south or east. Expansive landscape knowledge gained through long-distance associations would have allowed Promontory caves inhabitants to make well-informed decisions about directions and routes of movement for a territorial shift, which seems to have occurred in the late thirteenth century.

Recognition of n-alkyl and isoprenoid algaenans in marine sediments by stable carbon isotopic analysis of pyrolysis products of kerogens

1998 ◽  
Vol 28 (3-4) ◽  
pp. 179-194 ◽  
Author(s):  
Ingeborg M Höld ◽  
Stefan Schouten ◽  
Heidy M.E van Kaam-Peters ◽  
Jaap S Sinninghe Damsté
Keyword(s):  
Marine Sediments ◽  
Isotopic Analysis ◽  
Stable Carbon ◽  
Pyrolysis Products ◽  
Carbon Isotopic

A new method for carbon isotopic analysis of protein

Science ◽  
1991 ◽  
Vol 251 (4993) ◽  
pp. 552-554 ◽  
Author(s):  
D. Nelson
Keyword(s):  
Isotopic Analysis ◽  
New Method ◽  
Carbon Isotopic

Stable Carbon Isotopic Analysis of Low-Level Methane in Water and Gas

1997 ◽  
Vol 69 (1) ◽  
pp. 40-44 ◽  
Author(s):  
Francis J. Sansone ◽  
Brian N. Popp ◽  
Terri M. Rust
Keyword(s):  
Isotopic Analysis ◽  
Stable Carbon ◽  
Low Level ◽  
Carbon Isotopic

scholarly journals High resolution carbon isotopic analysis across the Ordovician-Silurian boundary of the Wangjiawan section, South China

2007 ◽  
Vol 64 ◽  
pp. 83-87
Author(s):  
Hiromi Yamamoto ◽  
Yoshitaka Hamada ◽  
Yue Li ◽  
Yusuke Setsuda ◽  
Ryo Matsumoto
Keyword(s):  
High Resolution ◽  
South China ◽  
Isotopic Analysis ◽  
Carbon Isotopic

RADIO OBSERVATIONS ON THE UPPER IONIZED LAYER OF THE ATMOSPHERE AT THE TIME OF THE TOTAL SOLAR ECLIPSE OF AUGUST 31, 1932

1933 ◽  
Vol 8 (1) ◽  
pp. 15-28
Author(s):  
D. C. Rose
Keyword(s):  
Solar Eclipse ◽  
Research Council ◽  
Short Pulse ◽  
Time Lag ◽  
National Research Council ◽  
Ultra Violet ◽  
Total Solar Eclipse ◽  
Ion Content ◽  
Violet Light ◽  
Set Up

This report contains the results from one of the three stations set up by the National Research Council of Canada to take observations on radio reflections from the ionized layers in the upper atmosphere during the total solar eclipse of August 31, 1932. The station concerned was located at Kingston, Ontario, and was approximately under the centre of totality for the upper or Appleton layer. Hence observations at this station were limited to the upper layer. The results from the other two stations at Corner Brook, Newfoundland, and at Vankleek Hill, Ontario, are reported in the paper immediately preceding (8).The method was that developed by Breit and Tuve, in which a short pulse is transmitted, the reflection being received and its time delay recorded by means of a cathode ray oscillograph.The results indicate that the ionization of the upper layer is caused by radiation (presumably ultra-violet light) from the sun. Whether or not this is the sole cause is uncertain because of the time lag in recombination of ions in the layer. A reduction in ionization of over 30% was noted.A magnetic storm which occurred a few days before the eclipse made the results more difficult to interpret but gave some information of the effect of such a storm on the upper layer. It appeared to cause considerable instability in the layer and a somewhat lower ion content.

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