Stability of atmospheric CO2 levels across the Triassic/Jurassic boundary

Nature ◽  
2001 ◽  
Vol 411 (6838) ◽  
pp. 675-677 ◽  
Author(s):  
Lawrence H. Tanner ◽  
John F. Hubert ◽  
Brian P. Coffey ◽  
Dennis P. McInerney
Keyword(s):  
Atmospheric Co2 ◽  
Co2 Levels

scholarly journals GIS-Based Approach to Spatio-Temporal Interpolation of Atmospheric CO2 Concentrations in Limited Monitoring Dataset

Atmosphere ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 384
Author(s):  
Yaroslav Bezyk ◽  
Izabela Sówka ◽  
Maciej Górka ◽  
Jan Blachowski
Keyword(s):  
Seasonal Variability ◽  
Sampling Strategy ◽  
Climate Impacts ◽  
Air Pollutant ◽  
Urban Atmosphere ◽  
Atmospheric Co2 ◽  
Spatial Characteristic ◽  
Interpolation Methods ◽  
Co2 Levels ◽  
The City

Understanding the magnitude and distribution of the mixes of the near-ground carbon dioxide (CO2) components spatially (related to the surface characteristics) and temporally (over seasonal timescales) is critical to evaluating present and future climate impacts. Thus, the application of in situ measurement approaches, combined with the spatial interpolation methods, will help to explore variations in source contribution to the total CO2 mixing ratios in the urban atmosphere. This study presents the spatial characteristic and temporal trend of atmospheric CO2 levels observed within the city of Wroclaw, Poland for the July 2017–August 2018 period. The seasonal variability of atmospheric CO2 around the city was directly measured at the selected sites using flask sampling with a Picarro G2201-I Cavity Ring-Down Spectroscopy (CRDS) technique. The current work aimed at determining the accuracy of the interpolation techniques and adjusting the interpolation parameters for estimating the magnitude of CO2 time series/seasonal variability in terms of limited observations during the vegetation and non-vegetation periods. The objective was to evaluate how different interpolation methods will affect the assessment of air pollutant levels in the urban environment and identify the optimal sampling strategy. The study discusses the schemes for optimization of the interpolation results that may be adopted in areas where no observations are available, which is based on the kriging error predictions for an appropriate spatial density of measurement locations. Finally, the interpolation results were extended regarding the average prediction bias by exploring additional experimental configurations and introducing the limitation of the future sampling strategy on the seasonal representation of the CO2 levels in the urban area.

scholarly journals Evidence for the Postconquest Demographic Collapse of the Americas in Historical CO2 Levels

2006 ◽  
Vol 10 (11) ◽  
pp. 1-14 ◽  
Author(s):  
Franz X. Faust ◽  
Cristóbal Gnecco ◽  
Hermann Mannstein ◽  
Jörg Stamm
Keyword(s):  
Population Dynamics ◽  
Strong Evidence ◽  
Ice Cores ◽  
Causal Chain ◽  
Atmospheric Co2 ◽  
Agricultural Fields ◽  
Native Populations ◽  
Co2 Levels ◽  
European Colonization ◽  
Global Population

Abstract This article promotes the hypothesis that the massive demographic collapse of the native populations of the Americas triggered by the European colonization brought about the abandonment of large expanses of agricultural fields soon recovered by forests, which in due turn fixed atmospheric CO2 in significant quantities. This hypothesis is supported by measurements of atmospheric CO2 levels in ice cores from Law Dome, Antarctica. Changing the focus from paleoclimate to global population dynamics and using the same causal chain, the measured drop in historic atmospheric CO2 levels can also be looked upon as further, strong evidence for the postconquest demographic collapse of the Americas.

Millennial-scale changes in atmospheric CO2 levels linked to the Southern Ocean carbon isotope gradient and dust flux

2013 ◽  
Vol 6 (6) ◽  
pp. 457-461 ◽  
Author(s):  
Martin Ziegler ◽  
Paula Diz ◽  
Ian R. Hall ◽  
Rainer Zahn
Keyword(s):  
Southern Ocean ◽  
Carbon Isotope ◽  
Atmospheric Co2 ◽  
Dust Flux ◽  
Co2 Levels ◽  
Ocean Carbon ◽  
Millennial Scale

High dependence of Ordovician ocean surface circulation on atmospheric CO2 levels

2016 ◽  
Vol 458 ◽  
pp. 39-51 ◽  
Author(s):  
Alexandre Pohl ◽  
Elise Nardin ◽  
Thijs R.A. Vandenbroucke ◽  
Yannick Donnadieu
Keyword(s):  
Ocean Surface ◽  
Atmospheric Co2 ◽  
Surface Circulation ◽  
Co2 Levels ◽  
Ocean Surface Circulation

scholarly journals Atmospheric CO2 levels from 2.7 billion years ago inferred from micrometeorite oxidation

2020 ◽  
Vol 6 (4) ◽  
pp. eaay4644 ◽  
Author(s):  
O. R. Lehmer ◽  
D. C. Catling ◽  
R. Buick ◽  
D. E. Brownlee ◽  
S. Newport
Keyword(s):  
Oxidation State ◽  
Atmospheric Co2 ◽  
Atmospheric Composition ◽  
Atmospheric Conditions ◽  
Early Atmosphere ◽  
Co2 Levels ◽  
Kinetic Oxidation

Earth’s atmospheric composition during the Archean eon of 4 to 2.5 billion years ago has few constraints. However, the geochemistry of recently discovered iron-rich micrometeorites from 2.7 billion–year–old limestones could serve as a proxy for ancient gas concentrations. When micrometeorites entered the atmosphere, they melted and preserved a record of atmospheric interaction. We model the motion, evaporation, and kinetic oxidation by CO2 of micrometeorites entering a CO2-rich atmosphere. We consider a CO2-rich rather than an O2-rich atmosphere, as considered previously, because this better represents likely atmospheric conditions in the anoxic Archean. Our model reproduces the observed oxidation state of micrometeorites at 2.7 Ga for an estimated atmospheric CO2 concentration of >70% by volume. Even if the early atmosphere was thinner than today, the elevated CO2 level indicated by our model result would help resolve how the Late Archean Earth remained warm when the young Sun was ~20% fainter.

Recent Record Growth in Atmospheric CO2 Levels

2005 ◽  
Vol 2 (1) ◽  
pp. 3 ◽  
Author(s):  
Roger J. Francey
Keyword(s):  
Climate Change ◽  
Carbon Dioxide ◽  
Greenhouse Effect ◽  
Fossil Fuels ◽  
Trace Gases ◽  
Atmospheric Co2 ◽  
Past Century ◽  
The Past ◽  
Rate Of Growth ◽  
Co2 Levels

Environmental Context.Excessive levels of carbon dioxide are accumulating in the atmosphere, principally from burning fossil fuels. The gas is linked to the enhanced greenhouse effect and climate change, and is thus monitored carefully, along with other trace gases that reflect human activity.The rate of growth of carbon dioxide has increased gradually over the past century, and more rapidly in the last decade. Teasing out fossil emissions from changes due to wildfires and to natural exchange with plants and oceans guide global attempts in reducing emissions.

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