scholarly journals World Atlas of late Quaternary Foraminiferal Oxygen and Carbon Isotope Ratios

2021 ◽  
Author(s):  
Stefan Mulitza ◽  
Torsten Bickert ◽  
Helen C. Bostock ◽  
Cristiano M. Chiessi ◽  
Barbara Donner ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Carbon Isotope ◽  
Late Quaternary ◽  
Sediment Cores ◽  
Software Tool ◽  
Isotope Ratios ◽  
Data Set ◽  
Carbon Isotope Ratios ◽  
Oxygen And Carbon Isotope ◽  
Age Constraints

Abstract. We present a global atlas of downcore foraminiferal oxygen and carbon isotope ratios available at https://doi.pangaea.de/10.1594/PANGAEA.936747 (Mulitza et al., 2021). The database contains 2,108 published and previously unpublished stable isotope downcore records with 362,067 stable isotope values of various planktonic and benthic species of foraminifera from 1,265 sediment cores. Age constraints are provided by 6,153 uncalibrated radiocarbon ages from 598 (47 %) of the cores. Each stable isotope and radiocarbon series is provided in a separate netCDF file containing fundamental meta data as attributes. The data set can be managed and explored with the free software tool PaleoDataView. The atlas will provide important data for paleoceanographic analyses and compilations, site surveys, or for teaching marine stratigraphy. The database can be updated with new records as they are generated, providing a live ongoing resource into the future.

scholarly journals Supplementary material to "World Atlas of late Quaternary Foraminiferal Oxygen and Carbon Isotope Ratios"

2021 ◽  
Author(s):  
Stefan Mulitza ◽  
Torsten Bickert ◽  
Helen C. Bostock ◽  
Cristiano M. Chiessi ◽  
Barbara Donner ◽  
...  
Keyword(s):  
Carbon Isotope ◽  
Late Quaternary ◽  
Isotope Ratios ◽  
Carbon Isotope Ratios ◽  
Oxygen And Carbon Isotope ◽  
Supplementary Material

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.

Organic carbon isotope ratios and paleoenvironmental implications for Holocene sediments in Lake Melville, southeastern Labrador

1987 ◽  
Vol 24 (10) ◽  
pp. 1994-2003 ◽  
Author(s):  
F. C. Tan ◽  
G. Vilks
Keyword(s):  
Organic Carbon ◽  
Carbon Isotope ◽  
Sediment Cores ◽  
Isotope Ratios ◽  
Carbon Isotope Ratios ◽  
Organic Carbon Isotope ◽  
Glacial Runoff ◽  
Bottom Waters ◽  
History Of ◽  
Marine Influence

Stable isotope 13C/12C ratios of organic carbon in sediments and in particulate organic carbon (POC) change from typically marine values in Groswater Bay to those of terrestrial soils in Goose Bay along an offshore–onshore transect in Hamilton Inlet, southeastern Labrator. The δ13C values in POC collected from close to the water surface change relatively little in Lake Melville, indicating that the integrity of the runoff plume is maintained as it spreads in Lake Melville. The organic carbon isotope ratios in POC collected from the near-bottom waters are similar to those of surficial sediments.Downcore δ13C values reflect paleo-oceanographic changes in Hamilton Inlet during and since deglaciation. In two sediment cores that reached sufficiently old sediments (10 000 years BP), the δ13C values change toward the bottom of the cores to values similar to those of the terrestrial organic carbon in soils, signifying greater terrestrial influence during deglaciation and during the early Holocene.According to the history of postglacial isostatic readjustment of the area, Lake Melville basin was more open to the marine waters during the early postglacial marine incursion because of deeper channels leading into Lake Melville. As a consequence, evidence for greater marine influence during that time should be found in sediment cores. The lack of evidence for the deposition of marine organic carbon brought in by the marine counterflow waters suggests a proximal glaciomarine environment in the Lake Melville basin. Glacial runoff diluted the basin waters, and it is possible that the whole inner Labrador Shelf was relatively fresh during that time.

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