Greenhouse gases in the Earth system: a palaeoclimate perspective
Abstract
While the trends in greenhouse gas concentrations in recent decades are clear, their significance is only revealed when viewed in the context of a longer time period. Fortunately, the air bubbles in polar ice cores provide an unusually direct method of determining the concentrations of stable gases over a period of (so far) 800 000 years. Measurements on different cores with varying characteristics, as well as an overlap of ice-core and atmospheric measurements covering the same time period, show that the ice-core record provides a faithful record of changing atmospheric composition. The mixing ratio of CO 2 is now 30 per cent higher than any value observed in the ice-core record, while methane is more than double any observed value; the rate of change also appears extraordinary compared with natural changes. Before the period when anthropogenic changes have dominated, there are very interesting natural changes in concentration, particularly across glacial/interglacial cycles, and these can be used to understand feedbacks in the Earth system. The phasing of changes in temperature and CO 2 across glacial/interglacial transitions is consistent with the idea that CO 2 acts as an important amplifier of climate changes in the natural system. Even larger changes are inferred to have occurred in periods earlier than the ice cores cover, and these events might be used to constrain assessments of the way the Earth could respond to higher than present concentrations of CO 2 , and to a large release of carbon: however, more certainty about CO 2 concentrations beyond the time period covered by ice cores is needed before such constraints can be fully realized.
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Atmospheric CO2 concentrations have exceeded Holocene levels since at least 1850 C.E.
“Atmospheric CO2, now above 400 ppm, is currently being emitted into the atmosphere ~100 times as fast as the most rapid emission of the past 800,000 years ( 65 ) and concentrations have exceeded Holocene levels since at least 1850 C.E. (Fig. 5).”
From The Anthropocene is functionally and stratigraphically distinct from the Holocene (2016) · cites this paper as [65]
Atmospheric CO2 is now above 400 ppm and is currently being emitted ~100 times as fast as the most rapid emission of the past 800,000 years.
“Atmospheric CO2, now above 400 ppm, is currently being emitted into the atmosphere ~100 times as fast as the most rapid emission of the past 800,000 years ( 65 ) and concentrations have exceeded Holocene levels since at least 1850 C.E. (Fig. 5).”
From The Anthropocene is functionally and stratigraphically distinct from the Holocene (2016) · cites this paper as [65]
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The Anthropocene is functionally and stratigraphically distinct from the Holocene
Waters, C. N., Zalasiewicz, J., Summerhayes, C., Barnosky, A. D., Poirier, C., Gałuszka, A., Cearreta, A., Edgeworth, M., Ellis, E. C., Ellis, M., et al. (2016) · Science · doi:10.1126/science.aad2622 · Cited by 2,375 · see citing works
- Authors
- Wolff, E. W.
- Affiliations
- British Antarctic Survey (GB)
- Corresponding author
- Wolff, Eric W.
- ORCID
- Wolff, Eric W.
- Venue
- Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
- Publisher
- The Royal Society
- Published
- 2011-05-28
- Volume
- 369
- Issue
- 1943
- Pages
- 2133-2147
- ISSN
- 1364-503X (ISSN-L)
- 1471-2962
- OpenAlex
- W2096143282
- Cited by
- 68
- References
- 64
- Citations by year
- 2024: 4 · 2021: 17 · 2019: 14 · 2018: 5 · 2017: 4 · 2016: 5 · 2015: 7 · 2014: 2 · 2013: 5 · 2012: 3
- FWCI
- 2.29
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences (publishedVersion)
- PubMed (publishedVersion)
- NERC Open Research Archive (Natural Environment Research Council) (submittedVersion)
- Funders
- Natural Environment Research Council (NE/E007600/1, bas0100024)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
- Physical Sciences › Environmental Science › Global and Planetary Change › Atmospheric and Environmental Gas Dynamics
- Keywords
- greenhouse gases, ice core records, atmospheric CO2, methane, glacial-interglacial cycles, carbon cycle feedbacks, paleoclimate, carbon release, Earth system dynamics
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