Control of atmospheric CO2 level - Implementation of the AP proposal

1994 ◽  
Keyword(s):  
Atmospheric Co2 ◽  
Co2 Level

Degradation of Kresoxim-Methyl in Water: Impact of Varying pH, Temperature, Light and Atmospheric CO2 Level

2015 ◽  
Vol 96 (1) ◽  
pp. 130-136 ◽  
Author(s):  
Ashish Khandelwal ◽  
Suman Gupta ◽  
Vijay T. Gajbhiye ◽  
Eldho Varghese
Keyword(s):  
Atmospheric Co2 ◽  
Water Impact ◽  
Co2 Level

scholarly journals Evidences of Widespread Cretaceous Deep Weathering and Its Consequences: A Review

2016 ◽  
Vol 5 (2) ◽  
pp. 69 ◽  
Author(s):  
Timothy Bata
Keyword(s):  
Climatic Condition ◽  
Atmospheric Co2 ◽  
Present Value ◽  
Weathering Processes ◽  
Greenhouse Climate ◽  
Temperature And Humidity ◽  
Co2 Level

This study highlights the effect of the Cretaceous greenhouse climate on weathering processes. Atmospheric CO2 level was relatively higher in the Cretaceous than it was in both the Jurassic and the Cenozoic. Consequently, temperature and humidity were higher in the Cretaceous than in the Jurassic and the Cenozoic. The interaction among the high levels of atmospheric CO2, extreme global warmth, and humidity in the Cretaceous resulted in widespread deep weathering. Cretaceous palaeo-weathering profiles are observed to occur at higher palaeolatitudes relative to the Jurassic and Cenozoic palaeo-weathering profiles. This implies the upward warming of the Cretaceous palaeolatitude, consistent with palaeotemperature estimates for the Cretaceous. The present thickness of weathering profiles in some selected tropical zones is approximately 200 m. During the greenhouse climatic condition in the Cretaceous, the thickness of weathering profiles at those areas could have been up to 4–5 times the present value. This suggests that many sediments were produced from the Cretaceous weathering events.

A breath of fresh air for atmospheric CO2 utilisation: plasmon-assisted preparation of cyclic carbonate at ambient conditions

2021 ◽  
Author(s):  
Olga Guselnikova ◽  
Pavel S Postnikov ◽  
Jiri Kosina ◽  
Zdenka Kolska ◽  
Andriy Trelin ◽  
...  
Keyword(s):  
21St Century ◽  
Cyclic Carbonate ◽  
Atmospheric Co2 ◽  
Advanced Materials ◽  
Ambient Conditions ◽  
Global Problem ◽  
Co2 Level ◽  
Co2 Utilisation

The increase of CO2 level becomes a global problem of 21st century leading to the actual request for new advanced materials and methods of CO2 utilisation. Here, we propose the...

Leaf traits of long-ranging Paleogene species and their relationship with depositional facies, climate and atmospheric CO2 level

2019 ◽  
Vol 298 (4-6) ◽  
pp. 93-172 ◽  
Author(s):  
Karolin Moraweck ◽  
Michaela Grein ◽  
Wilfried Konrad ◽  
Jiří Kvaček ◽  
Johanna Kova-Eder ◽  
...  
Keyword(s):  
Leaf Traits ◽  
Atmospheric Co2 ◽  
Depositional Facies ◽  
Co2 Level

Atmospheric carbon dioxide and the long-term control of the Earth's climate

1995 ◽  
Vol 13 (7) ◽  
pp. 782-790 ◽  
Author(s):  
J. H. Carver ◽  
I. M. Vardavas
Keyword(s):  
Atmospheric Carbon Dioxide ◽  
Plate Tectonics ◽  
Co2 Concentration ◽  
Atmospheric Co2 ◽  
The Sun ◽  
Model Calculations ◽  
Co2 Level ◽  
Earth’S Climate ◽  
Outgassing Rate ◽  
Geologic Record

Abstract. A CO2-weathering model has been used to explore the possible evolution of the Earth's climate as the Sun steadily brightened throughout geologic time. The results of the model calculations can be described in terms of three, qualitatively different, "Megaclimates". Mega-climate 1 resulted from a period of rapid outgassing in the early Archean, with high, but declining, temperatures caused by the small weathering rates on a largely water-covered planet. Mega-climate 2 began about 3 Gyear ago as major continental land masses developed, increasing the weathering rate in the early Proterozoic and thereby depleting the atmospheric CO2 concentration. This process produced the first Precambrian glaciations about 2.3 Gyear ago. During Mega-climate 2, evolutionary biological processes increased the surface weatherability in incremental steps and plate tectonics modulated the CO2 outgassing rate with an estimated period of 150 Myear (approximately one-half the period for the formation and breakup of super continents). Throughout Mega-climate 2 the surface temperature was controlled by variations in the atmospheric CO2 level allowing transitions between glacial and non-glacial conditions. The results of the model for Mega-climate 2 are in agreement with the occurrence (and absence) of glaciations in the geologic record. Extending the model to the future suggests that CO2 control of the Earth's temperature will no longer be able to compensate for a solar flux that continues to increase. The present level of atmospheric CO2 is so small that further reduction in CO2 cannot prevent the Earth from experiencing Mega-climate 3 with steadily increasing surface temperatures caused by the continued brightening of the Sun. During Mega-climate 3, the main danger to the biosphere would come not from an increasing temperature but from a decreasing (rather than an increasing) CO2 level which could, in time, fall below 0.5 PAL, causing serious damage to the biosphere. Fortunately, the rates of change due to solar brightening are slow enough that Mega-climate 3 appears to pose no threat to the biosphere for the next 0.5-2 Gyear.

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