Intra-annual variation in the stable oxygen and carbon isotope ratios of cellulose in tree rings of coast redwood (Sequoia sempervirens)

The Holocene ◽  
2009 ◽  
Vol 19 (2) ◽  
pp. 189-197 ◽  
Author(s):  
John S. Roden ◽  
James A. Johnstone ◽  
Todd E. Dawson
Keyword(s):  
Carbon Isotope ◽  
Tree Rings ◽  
Annual Variation ◽  
Isotope Ratios ◽  
Sequoia Sempervirens ◽  
Coast Redwood ◽  
Carbon Isotope Ratios ◽  
Oxygen And Carbon Isotope ◽  
Stable Oxygen

Aerial decay influence on the stable oxygen and carbon isotope ratios in tree ring cellulose

2018 ◽  
Vol 49 ◽  
pp. 110-117 ◽  
Author(s):  
Viorica Nagavciuc ◽  
Zoltán Kern ◽  
Aurel Perşoiu ◽  
Dóra Kesjár ◽  
Ionel Popa
Keyword(s):  
Carbon Isotope ◽  
Tree Ring ◽  
Isotope Ratios ◽  
Carbon Isotope Ratios ◽  
Oxygen And Carbon Isotope ◽  
Stable Oxygen ◽  
Tree Ring Cellulose

Oxygen and carbon isotope ratios in the martian atmosphere

Icarus ◽  
2007 ◽  
Vol 192 (2) ◽  
pp. 396-403 ◽  
Author(s):  
Vladimir A. Krasnopolsky ◽  
Jean Pierre Maillard ◽  
Tobias C. Owen ◽  
Robert A. Toth ◽  
Michael D. Smith
Keyword(s):  
Carbon Isotope ◽  
Martian Atmosphere ◽  
Isotope Ratios ◽  
Carbon Isotope Ratios ◽  
Oxygen And Carbon Isotope

Variability of Indian monsoonal rainfall over the past 100 ka and its implication for C3–C4 vegetational change

2012 ◽  
Vol 77 (1) ◽  
pp. 159-170 ◽  
Author(s):  
Shailesh Agrawal ◽  
Prasanta Sanyal ◽  
Anindya Sarkar ◽  
Manoj Kumar Jaiswal ◽  
Koushik Dutta
Keyword(s):  
Carbon Isotope ◽  
Isotope Ratios ◽  
Ganga Plain ◽  
Carbon Isotope Ratios ◽  
Oxygen And Carbon Isotope ◽  
Vegetational Change ◽  
Time Period ◽  
Soil Carbonate ◽  
Maximum Decrease ◽  
Rainfall Variations

Oxygen and carbon isotope ratios of soil carbonate and carbon isotope ratios of soil organic matter (SOM) separated from three cores, Kalpi, IITK and Firozpur, of the Ganga Plain, India are used to reconstruct past rainfall variations and their effect on ambient vegetation. The δ18O values of soil carbonate (δ18OSC) analyzed from the cores range from −8.2 to −4.1‰. Using these variations in δ18OSC values we are able, for the first time, to show periodic change in rainfall amount between 100 and 18 ka with three peaks of higher monsoon at about 100, 40 and 25 ka. The estimation of rainfall variations using δ18O value of rainwater-amount effect suggests maximum decrease in rainfall intensity (~ 20%) during the last glacial maximum. The δ13C values of soil carbonate (δ13CSC) and SOM (δ13CSOM) range from −6.3 to + 1.6‰ and −28.9 to −19.4‰, respectively, implying varying proportions of C3 and C4 vegetations over the Ganga Plain during the last 100 ka. The comparison between monsoonal rainfall and atmospheric CO2 with vegetation for the time period 84 to 18 ka indicate that relative abundances of C3 and C4 vegetations were mainly driven by variations in monsoonal rainfall.

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