global dimming

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Series: GSA Special Papers
Published: 01 September 2014
DOI: 10.1130/2014.2505(23)
.... The late spring timing of extraterrestrial input best matches the Eta Aquarid meteor shower associated with comet 1P/Halley. An increased flux of cometary dust might explain a modest climate downturn in A.D. 533. Both cometary dust and volcanic sulfate probably contributed to the profound global dimming...
Series: European Mineralogical Union Notes in Mineralogy
Published: 01 January 2012
DOI: 10.1180/EMU-notes.13.6
EISBN: 9780903056403
... in incident solar radiation and an increase in planetary albedo were observed worldwide until about 1990. This phenomenon is referred to as ‘global dimming’, and is thought to have resulted from increasing aerosol forcing. After 1990, the trends changed signs and a brightening (a decrease in planetary albedo...
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Journal Article
Journal: Interpretation
Published: 22 July 2016
Interpretation (2016) 4 (3): SN45-SN69.
... constrained and, to some degree, predictable. The change from hard mudstones to soft claystones, which can be recognized in seismic data, may result in a transition from bright to dim spots, possibly taking place within the same stratigraphic interval and over short distances. Many clastic basins globally...
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Map showing <b>global</b> distribution of Dimorphosiphon algae. Where present, <b>Dim</b>...
Published: 01 October 2012
Figure 9 Map showing global distribution of Dimorphosiphon algae. Where present, Dimorphosiphon is commonly a major skeletal component of shallow marine tropical carbonates. Map modified from Scotese and McKerrow (1990) and Poncet and Roux (1990) .
Journal Article
Journal: Interpretation
Published: 25 September 2018
Interpretation (2018) 6 (4): SO1-SO15.
... cycles of parallel to subparallel high amplitude and dim reflectors in seismic data, which we interpreted as alternating canyon fill, based on the interpretation of seismic facies. Thus, the sedimentary evolution of the ZJC can be divided into four typical stages, which were in the Middle Miocene, Late...
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Journal Article
Journal: Interpretation
Published: 05 August 2016
Interpretation (2016) 4 (4): SU17-SU24.
... the seismic dimming area as shown in (b) the seismic section. The survey covers about an area of 25 × 20    km . After describing the time-domain FWI approach used, we review the geologic context and the data set to be inverted, along with the preprocessing and additional steps required...
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Journal Article
Journal: Interpretation
Published: 20 May 2016
Interpretation (2016) 4 (3): SJ1-SJ16.
..., whereas the use of receiver functions might be compromised by the presence of melt. Global tomography can be used to identify the presence of the slab, but it does not reveal the structure in detail. We have determined how detailed images can be obtained using global-phase seismic interferometry...
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Journal Article
Journal: The Leading Edge
Published: 01 January 2011
The Leading Edge (2011) 30 (1): 38-47.
... of the data and offer solutions based upon all of the data. In this respect, the use of computers in 3D volume interpretation has not reached its full potential (Lomask and Guitton). Recently, however, global approaches have been proposed to compute geological models directly from the seismic data without...
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Journal Article
Journal: Interpretation
Published: 15 October 2014
Interpretation (2014) 2 (4): SP41-SP44.
... of polarity reversal and dim spot systems, in which the acoustic impedance of the reservoir is higher than the overburden or underburden, requires the interpreter to use a different and more complicated set of rules to validate these as direct hydrocarbon indicators. The interpretation...
Journal Article
Journal: Geophysics
Published: 01 October 2008
Geophysics (2008) 73 (5): VE235-VE241.
... and other velocity anomalies. In the region under investigation, the velocity field is complicated by narrow buried canyons ( 500 m wide) filled with low-velocity sediments, which give rise to severe pull-down effects; possible free-gas accumulation below an extensive gas-hydrate cap, causing dimming...
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Journal Article
Journal: Elements
Published: 01 August 2006
Elements (2006) 2 (4): 217-222.
... into the mantle. Thereafter a lifeless Earth, heated only by the dim light of the young Sun, would have evolved into a bitterly cold ice world. The cooling trend was frequently interrupted by volcanic- or impact-induced thaws. © 2006 by the Mineralogical Society of America 2006 Hadean Earth Moon-forming...
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Journal Article
Published: 01 January 2004
Petroleum Geoscience (2004) 10 (1): 35-42.
.... If such a location or zone existed, it was expected to be in or above a fault plane, as leakage in the 35/10-area is thought to mainly result from shear failure along faults. The investigation found a zone with pronounced dimming above a triple fault intersection bounding the 35/10-2 structure. This zone stretches...
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Journal Article
Journal: Geophysics
Published: 14 October 2009
Geophysics (2009) 74 (6): N41-N48.
... is divided into three general classes. These classes are (1) low-frequency dim-out reservoirs, in which NI magnitude decreases toward lower frequencies; (2) phase-shift reservoirs, in which NI is a small negative value at low frequencies but becomes positive at higher frequencies; and (3) low-frequency...
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Published: 01 December 2013
DOI: 10.5724/gcs.03.23.0523
EISBN: 978-0-9836096-7-4
... sands are rare. Viewed on seismic data, the three confined fourth-order sequences in the most updip parts of the canyons contain sharply defined channel-scale features. Downdip, however, strata are seismically dim, and channels the size of canyons cut into each other giving a nested look. Together...
Journal Article
Journal: AAPG Bulletin
Published: 11 November 1999
AAPG Bulletin (1999) 83 (11): 1703-1728.
... with subseismic scale information from well data; however, inherent noise within the seismic data introduced by the complex buildup morphology has resulted in inconsistent attribute distribution and fault dimming. These difficulties are compounded by erratic velocity distribution within the limestone...
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Journal Article
Published: 01 July 2014
Bulletin of the Seismological Society of America (2014) 104 (4): 2091-2103.
... sequence ( ETAS ) branching process model is fitted to tsunami catalog events, using the earthquake magnitude of the causative event from the Centennial and Global Centroid Moment Tensor ( CMT ) catalogs and tsunami sizes above a completeness level as a mark to indicate that a tsunami was generated...
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Journal Article
Published: 01 May 2004
Journal of the Geological Society (2004) 161 (3): 489-499.
... for the seawater sulphur isotopic composition at the terminal Neoproterozoic–Cambrian boundary. As a result of the inherent variability of bacterial sulphate reduction, δ 34 S values at the lower end of the spectrum should be most representative for the global signal. Based on results of this study, the global...
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Journal Article
Journal: Geology
Published: 01 May 2003
Geology (2003) 31 (5): 431-434.
... coincident with a large-magnitude, but short-lived negative excursion in the carbon isotope composition of seawater that is globally coincident with the Precambrian-Cambrian boundary. U-Pb zircon age data from an intercalated ash bed directly define this negative excursion to be at 542.0 ± 0.3 Ma, consistent...
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Series: Geological Society, London, Special Publications
Published: 01 January 2006
DOI: 10.1144/GSL.SP.2006.254.01.05
EISBN: 9781862395022
... anomaly. By comparing and contrasting these case studies it is possible to examine some of the key elements necessary to successfully explore for stratigraphic and subtle combination traps. Fig. 3. Global distributions of the studied 174 stratigraphic and subtle combination...
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Journal Article
Journal: Geophysics
Published: 31 May 2016
Geophysics (2016) 81 (4): IM35-IM43.
... for finding a solution significantly closer to a global minimum for the objective function, compared to simple gradient methods, such as back propagation. The combination of these methods together with Tikhonov regularization allows for building stable predictions in spatial or/and time coordinates...
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