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albedo

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Series: GSA Special Papers
Published: 06 March 2020
DOI: 10.1130/2020.2544(02)
EISBN: 9780813795447
... continents ( Schrag et al., 2002 ). Hence, Neoproterozoic paleogeography may have been more sensitive to ice-albedo runaway. Alternatively, it has been proposed that long-term Neoproterozoic cooling was due to decreased volcanic outgassing from continental volcanic arcs ( McKenzie et al., 2014 , 2016...
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Journal Article
Journal: Elements
Published: 01 October 2019
Elements (2019) 15 (5): 325–330.
... of atmospheric p CO 2 such that weathering rates are insensitive to CO 2 , and further decreases in carbon input combined with ice albedo effects could result in runaway icehouse conditions. Similarly, silicate weathering may become supply-limited even with high temperature and high p CO 2 , where the system...
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Journal Article
Published: 22 August 2018
Canadian Journal of Earth Sciences (2019) 56 (1): 32–46.
... otherwise have on climate. Simulations based on a meltwater model indicate that direct forcing could result from amplified ultraviolet (UV) emission during solar maxima, combined with lower UV albedo of glacial ice. The plausible forcing mechanism bolsters epistemology for concluding a cause–effect...
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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/SP462.8
EISBN: 9781786203434
... Abstract Snow albedo is an important climate parameter as it governs the amount of solar energy absorbed by the snow and can be considered a major contributor to the surface radiation budget. The present study deals with the estimation of temporal variation of snow albedo at the upper elevation...
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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/SP462.10
EISBN: 9781786203434
... value (−1.08 mm/day) of sublimation rate at 4863 m a.s.l. shows that a large amount of energy available at the surface was used in sublimation processes. A comparatively lower albedo, relative humidity and net longwave radiation and higher latent heat flux, wind speed and net shortwave radiation yield...
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Journal Article
Published: 01 November 2017
Environmental and Engineering Geoscience (2017) 23 (4): 299–312.
... measurements were then averaged to yield an average penetration depth, which was used to represent the relative surface strength of each sample. Surface albedo was measured using an ASD FieldSpec® HandHeld Pro (325–1,075 nm) with plant probe; the average of 10 spectral reflectance curves per sample...
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Journal Article
Published: 01 April 2016
Clays and Clay Minerals (2016) 64 (2): 167–184.
... to assess the viability of this technique for quantification of organics and aliphatic compounds in particular, the present study examines how clay mineralogy, water content, and albedo influence the strength of organic absorptions in near-infrared (NIR) reflectance spectra. The effects of clay structure...
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Journal Article
Published: 01 November 2014
American Mineralogist (2014) 99 (11-12): 2280–2291.
... bands may also have application in remote sensing by indicating which bands are most sensitive to hematite, reported to be an important constituent of the martian surface. Furthermore, this study could help clarify remotely sensed terrestrial albedo changes, especially the Sahara/Sahel transition where...
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Journal Article
Published: 01 October 2014
American Mineralogist (2014) 99 (10): 1942–1955.
... derived for only a handful of geologically relevant monoclinic materials, including gypsum and orthoclase. Two input parameters that go into radiative transfer models, the scattering phase function and the single scattering albedo, are functions of a material’s optical constants. Pyroxene is a common rock...
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Series: GSA Special Papers
Published: 01 March 2011
DOI: 10.1130/2011.2477(06)
... an uncertain origin. Using a combination of Clementine and Lunar Orbiter images, several morphologic units are defined based on albedo, crater density, and surface roughness. An extensive unit of ancient mare basalt (cryptomare) is defined and, based on the number of superimposed craters, potentially...
Journal Article
Journal: Elements
Published: 01 February 2008
Elements (2008) 4 (1): 41–46.
... The extensive deposits generated by a supereruption may have global consequences. Covering a continent-sized area with white rhyolitic pumice and ash will increase the surface albedo, changing the land-atmosphere energy exchange. A blanketing ash layer will also kill vegetation and alter sources and sinks...
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Journal Article
Published: 01 September 2007
Journal of the Geological Society (2007) 164 (5): 895–921.
... margins), High-tilt Earth (high-obliquity and preferential low-latitude glaciation), Snowball Earth (extreme glaciation related to runaway ice–albedo feedback) and Slushball Earth (coexistence of unfrozen oceans and sea-level glaciers in the tropics). Climate models readily simulate runaway glaciation...
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Journal Article
Journal: Elements
Published: 01 June 2006
Elements (2006) 2 (3): 145–150.
... is likely connected to surface ice deposition as abundances are too high to be accounted for by vapor diffusion alone (e.g. Mustard et al. 2001 ; Christensen 2003 ; Head et al. 2003 ). Investigations of high- and low-albedo surfaces with visible/near-infrared (VNIR) spectra from Earth-based...
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Journal Article
Journal: Geosphere
Published: 01 May 2006
Geosphere (2006) 2 (3): 142–160.
... and on electronic process intensities. Here, we report first results of multiscale data integration for the Mount Etna volcano. Etna rocks consist of basalts, with very low albedo and variable degrees of alteration, and recent lava flows are characterized by overall low reflectance in both ASTER (advanced...
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Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2413(11)
..., and surface cover (albedo). Analyses of reflection papers and classroom observations from each step in the project indicated improvement in content knowledge for all student cohorts. However, regarding the ability to perform complex analysis, only students who successfully built new geoscience vocabularies...
Journal Article
Journal: Geology
Published: 01 June 2003
Geology (2003) 31 (6): 473–476.
...Christopher J. Poulsen Abstract A runaway ice-albedo feedback at low latitudes has been proposed as an essential mechanism for achieving an ice-covered Earth. Previous simulations of the Neoproterozoic climate using a coupled ocean-atmosphere model have failed to trigger this feedback, but have...
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Journal Article
Published: 01 June 2003
Environmental Geosciences (2003) 10 (2): 47–57.
...Nelson Veissid Abstract Earth's albedo is the fraction between the radiation reflected outside and the incident solar radiation, and regional albedo is this parameter obtained in the nadir point of a satellite. This work describes a new self-calibrated method for the assessment of albedo using...
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Journal Article
Journal: Geology
Published: 01 June 2000
Geology (2000) 28 (6): 499–502.
...Anders S. Henriksson; Michael Sarnthein; Geoffrey Eglinton; Jon Poynter Abstract Dimethylsulfide (DMS) released from phytoplankton produces cloud condensation nuclei in the marine troposphere, thereby providing a climate-regulating mechanism by increasing cloud albedo. A 200-k.y.-long sedimentary...
FIGURES
Journal Article
Journal: Geology
Published: 01 February 1996
Geology (1996) 24 (2): 103–106.
... and ultimately ice sheets. Circum-Atlantic uplift took place in the key latitudinal belt that is most sensitive to orbitally forced changes in solar irradiation; this, together with albedo effects from large snow fields, could have amplified the relatively weak Milankovitch signal. Geological Society...
Journal Article
Journal: Geology
Published: 01 February 1994
Geology (1994) 22 (2): 107–110.
... in or on the crater wall of a possible source region of the high-albedo White Rock material. If White Rock is the remnant of a once-larger deposit, then open- system circulation may have been required to deliver the required quantity of evaporites. Geological Society of America 1994 ...