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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...
FIGURES
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...
FIGURES
Journal Article
Journal: Paleobiology
Published: 14 October 2019
Paleobiology (2019) 45 (4): 517–530.
... competition in the broad sense favors winners that use and apply more power than losers; (2) greater access to material and energy sources increases the fit between organism and environment and raises the efficiency of natural selection; (3) powerful agents strengthen interdependencies and positive feedbacks...
Journal Article
Journal: Elements
Published: 01 October 2019
Elements (2019) 15 (5): 331–337.
..., the release of greenhouse gasses by intrusive volcanism and through positive feedbacks (as for methane hydrates) provides a tantalizing clue in the search for the smoking gun of ancient extinction events. It also warns of the future effects of more recently emitted fossil carbon into the Earth system...
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Journal Article
Journal: Elements
Published: 01 October 2019
Elements (2019) 15 (5): 325–330.
.../metamorphic degassing and the rates of carbon removal via silicate weathering and organic carbon burial ( Berner 2004 ) ( Fig. 1 ). Due to the small size of the surface carbon reservoir relative to the inputs from the solid Earth, a negative feedback between silicate weathering and temperature is required...
FIGURES | View All (5)
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...
FIGURES | View All (4)
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.
..., water flow, and biological activity, interact with weather and climate through multidirectional, time-varying feedbacks ( F ig . 3 ). For example, chemical weathering, physical erosion, and vegetation coverage all vary non-linearly with climate. The type and amount of vegetation controls sediment export...
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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.
... a reduction in porosity and which can affect both the permeability 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...
FIGURES
Journal Article
Journal: Elements
Published: 01 December 2018
Elements (2018) 14 (6): 367.
.... Fortunately, the ocean takes up some of this additional carbon, but, in so doing, sets in motion a cascade of interacting feedbacks centred on the iron cycle. A lower ocean pH, for example, may increase Fe(III) solubility, but, at the same time, locks dissolved iron into ligand-bound forms...
FIGURES
Journal Article
Journal: Geology
Published: 26 July 2017
Geology (2017) 45 (9): 823–826.
... and terrestrial vegetation on chemical weathering intensity and erosion at Lake Malawi using a long sediment record. Fossil pollen, microcharcoal, particle size, and mineralogy data affirm that the detrital clays accumulating in deep water within the lake are controlled by feedbacks between climate and hinterland...
FIGURES
Journal Article
Published: 01 May 2017
Vadose Zone Journal (2017) 16 (5): 1–20.
... of old water to streams was observed and hypothesized to be the result of macropore flow, piston flow, or transmissivity feedback depending on the season and water table position. Further investigations are recommended to increase our understanding of subsurface runoff generation mechanisms that promote...
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Journal Article
Journal: Geology
Published: 01 April 2017
Geology (2017) 45 (4): 307–310.
... and downsystem coupling mechanisms are joined in a negative feedback cycle. In this cycle, debuttressing and rebuttressing due to channel bed erosion and alluviation are the dominant controls on hillslope stability. Based on an order of magnitude estimate it is plausible that the observed feedback mechanism...
FIGURES | View All (4)
Journal Article
Journal: GSA Bulletin
Published: 01 March 2017
GSA Bulletin (2017) 129 (3-4): 318–330.
... . These results call for dynamic high-latitude feedbacks that are currently poorly represented in Earth system models and emphasize the need for additional near-field glacio-sedimentological, high-latitude sea-surface temperature and p CO 2 records across the Eocene-Oligocene transition. † passchiers...
Journal Article
Journal: Geology
Published: 01 February 2017
Geology (2017) 45 (2): 135–138.
... associated with each profile. These carbonate weathering rates extrapolated over the expansive shallow carbonate platforms of the middle Carboniferous indicate that glacioeustatic fall may have caused a 20%–50% increase in the dissolved CaCO 3 flux to the ocean. The complex feedbacks among carbonate...
Series: Society for Sedimentary Geology
Publisher: Society for Sedimentary Geology
Published: 01 January 2017
DOI: 10.2110/sepmsp.106.05
EISBN: 9781565763456
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Journal Article
Journal: Geology
Published: 01 December 2016
Geology (2016) 44 (12): 1035–1038.
.... The climate system feedbacks responsible for introducing this nonlinear ice sheet response to orbital variations in insolation remain uncertain. Here we present benthic foraminiferal stable isotope (δ 18 O, δ 13 C) and trace metal records (Cd/Ca, B/Ca, U/Ca) from Deep Sea Drilling Project Site 607...