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Series: GSA Special Papers
Published: 26 September 2022
DOI: 10.1130/2022.2556(05)
EISBN: 9780813795560
..., in particular, the relative roles of external radiative forcing versus internal feedback processes, remain to date highly controversial. The Miocene climate optimum (ca. 16.9–14.7 Ma) represents the warmest interval of the Neogene period (e.g., Shackleton and Kennett, 1975 ; Flower and Kennett, 1994...
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Journal Article
Published: 01 December 2021
Journal of the Geological Society (2022) 179 (3): jgs2021-055.
...) Kfs weakens the cloud albedo feedback mechanism, which increases climate sensitivity. These mechanisms offer an explanation as to why this otherwise benign mineral is correlated so strongly with mass extinction events: every Kfs-rich ejecta blanket corresponds to a severe extinction episode over...
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Journal Article
Journal: Geology
Published: 22 November 2021
Geology (2022) 50 (3): 260–265.
... and effusion and seismicity rates within the plumbing system. These data document that (1) there was no direct feedback between eruptive dynamics and graben topography, and (2) graben formation is near instantaneous on tectonic time scales. These results challenge the overarching role ascribed to magma...
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Journal Article
Journal: Geology
Published: 24 June 2021
Geology (2021) 49 (10): 1220–1224.
..., especially for winter, affected by a suite of strong feedbacks such as changes in sea-ice cover in the high latitudes. We present a synthesis of winter temperature and precipitation proxy data from the Atlantic seaboard of Europe, spanning from southern Iberia to the Arctic. Our data reveal distinct...
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Journal Article
Journal: Geology
Published: 19 May 2021
Geology (2021) 49 (9): 1074–1078.
... events increase porosity by fracturing. The model therefore accounts for positive and negative feedbacks that modify slip behavior through the seismic cycle. The model produces temporal clustering of earthquakes in the seismic record of the Aleutian margin, which has well-documented along-strike...
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Journal Article
Published: 28 December 2020
Journal of the Geological Society (2021) 178 (1): jgs2020-239.
... directly affected climate, not least by producing major variations in atmospheric greenhouse gas concentrations. The long-term geological perspective on climate change makes it apparent that, through changes in weathering and volcanism, and Earth system feedbacks resulting from changes in the Earth–Sun...
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Journal Article
Journal: Geology
Published: 04 November 2020
Geology (2021) 49 (3): 299–303.
... transfer of CO 2 to the atmosphere. Conversely, calcium sulfate deposition weakens greenhouse forcing, while the high depositional rates of evaporite giants may overwhelm the silicate weathering feedback, causing several degrees of planetary cooling. Non-steady-state evaporite dynamics and related...
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Journal Article
Journal: Geology
Published: 10 June 2020
Geology (2020) 48 (10): 966–970.
... marsh area decreases the sediment availability in estuarine systems through changes in regional-scale hydrodynamics. This positive feedback between marsh disappearance and the ability of coastal bays to retain sediments reduces the trapping capacity of the whole tidal system and jeopardizes the survival...
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Journal Article
Journal: Geology
Published: 28 October 2019
Geology (2020) 48 (1): 29–33.
... scales. Land plants still may cause reductions in steady-state atmospheric CO 2 levels, but via increasing the silicate weathering feedback strength, not silicate weathering rates. The mass-balance constraints on the long-term carbon cycle provide a mechanism for linking how land plant evolution...
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Journal Article
Journal: Paleobiology
Published: 14 October 2019
Paleobiology (2019) 45 (4): 517–530.
...-related traits, there are many compromises among traits affected by survival-related selection as well. These feedbacks between organism and environment have intensified as competitive winners successively achieved greater power over time. This was made possible by two intersecting circumstances...
Journal Article
Journal: Elements
Published: 01 October 2019
Elements (2019) 15 (5): 331–337.
.... Can be affected by biotic effects. * long-chained n -alkanes with a predominant odd-over-even chain length are biomarkers assigned to land plant leaf waxes. carbon cycle large igneous provinces greenhouse gas climate Earth system feedback Despite their versatility, carbon...
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Journal Article
Journal: Elements
Published: 01 October 2019
Elements (2019) 15 (5): 325–330.
... the solid Earth, a negative feedback between silicate weathering and temperature is required to stabilize atmospheric CO 2 and climate on timescales of longer than 10 5 years ( Walker et al. 1981 ). Thus, steady-state p CO 2 levels are determined by the input and the relative strength of the silicate...
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Journal Article
Journal: Geology
Published: 06 September 2019
Geology (2019) 47 (10): 992–996.
... million years; therefore, a negative feedback mechanism must have stabilized the carbon cycle. Here, we present the first almost-complete Paleogene silicate weathering intensity (SWI) records from continental rocks in the northern Tibetan Plateau showing that silicate weathering in this tectonically...
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Journal Article
Journal: Elements
Published: 01 August 2019
Elements (2019) 15 (4): 259–265.
...Patrick J. Frings A feedback between Earth surface weathering and climate is thought to be fundamental in maintaining Earth's habitability over long times-cales, but investigating this control in the modern world is difficult. The geologic record of cycles between glacial and interglacial...
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Journal Article
Journal: Elements
Published: 01 August 2019
Elements (2019) 15 (4): 235–240.
...James F. Kasting Earth's climate is buffered over long timescales by a negative feedback between atmospheric CO 2 level and surface temperature. The rate of silicate weathering slows as the climate cools, causing CO 2 to increase and warming the surface through the greenhouse effect. This buffering...
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Journal Article
Journal: Elements
Published: 01 August 2019
Elements (2019) 15 (4): 229–234.
... processes that work together to govern the form and function of the Earth's surface. These processes, which include erosion, water flow, and biological activity, interact with weather and climate through multidirectional, time-varying feedbacks ( F ig . 3 ). For example, chemical weathering, physical...
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Journal Article
Published: 30 May 2019
Geological Magazine (2020) 157 (10): 1729–1746.
...Robert Spicer; Paul Valdes; Alice Hughes; Jian Yang; Teresa Spicer; Alexei Herman; Alexander Farnsworth Abstract The Arctic is warming faster than anywhere else of comparable size on Earth, impacting global climate feedbacks and the Arctic biota. However, a warm Arctic is not novel. The Late...
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Journal Article
Journal: Geology
Published: 02 May 2019
Geology (2019) 47 (7): 650–654.
... reveals that two-way negative channel-hillslope feedbacks driven by block delivery to the river result in characteristic plan-view and cross-sectional river canyon forms. Internal negative feedbacks strongly reduce the rate at which erosional signals pass through landscapes, leading to persistent local...
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Journal Article
Journal: GSA Bulletin
Published: 24 April 2019
GSA Bulletin (2019) 131 (11-12): 1920–1942.
... appear to have caused biogeomorphic feedbacks, thereby exacerbating sediment deposition, disrupting flood conveyance, and contributing to decreases in peak-flow magnitude and in sediment transport. The progressive increase in water development in parts of the basin has also likely contributed...
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Journal Article
Journal: Elements
Published: 01 April 2019
Elements (2019) 15 (2): 81–86.
... and the diffusivity of ions and molecules. Thus, an additional set of relationships—such as the Kozeny–Carman equation for porosity–permeability feedbacks, or Archie's law for porosity–tortuosity interactions—relate the volume changes associated with geochemical reactions to the transport processes. This results...
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