scholarly journals High‐Resolution Observations of Subsurface Fronts and Alongshore Bottom Temperature Variability Over the Inner Shelf

2019 ◽  
Vol 124 (1) ◽  
pp. 593-614 ◽  
Author(s):  
Thomas P. Connolly ◽  
Anthony R. Kirincich
Keyword(s):  
High Resolution ◽  
Temperature Variability ◽  
Bottom Temperature ◽  
Inner Shelf

Use of novel high-resolution 3D marine seismic technology to evaluate Quaternary fluvial valley development and geologic controls on shallow gas distribution, inner shelf, Gulf of Mexico

2016 ◽  
Vol 4 (1) ◽  
pp. SC35-SC49 ◽  
Author(s):  
Timothy A. Meckel ◽  
Francis J. Mulcahy
Keyword(s):  
High Resolution ◽  
Gulf Of Mexico ◽  
Peak Frequency ◽  
High Amplitude ◽  
Structural Features ◽  
Inner Shelf ◽  
Sediment Delivery ◽  
Seismic Attribute ◽  
Meandering Channel ◽  
Attribute Analysis

The first deployment of the P-Cable™ high-resolution 3D (HR3D) seismic acquisition system in the Gulf of Mexico has provided unprecedented resolution of depositional, architectural, and structural features related to relative sea-level change recorded in the Quaternary stratigraphy. These details are typically beyond conventional 3D seismic resolution and/or excluded from commercial surveys, which are generally optimized for deeper targets. Such HR3D data are valuable for detailed studies of reservoir analogs, sediment delivery systems, fluid-migration systems, and geotechnical hazard assessment (i.e., drilling and infrastructure). The HR3D survey ([Formula: see text]) collected on the inner shelf ([Formula: see text] water depth) offshore San Luis Pass, Texas, imaged the upper 500 m of stratigraphy using peak frequency of 150 Hz and [Formula: see text] bin size. These data provided an exceptionally well-imaged example of shallow subsurface depositional system and stratigraphic architecture development during a lowstand period. The system evolved from a meandering channel with isolated point-bar deposits to a transgressive estuary characterized by dendritic erosional features that were eventually flooded. In addition, HR3D data have identified a previously unidentified seismically discontinuous zone interpreted to be a gas chimney system emanating from a tested (drilled) nonproductive, three-way structure in the lower Miocene (1.5 km depth). Within the shallowest intervals ([Formula: see text]) and at the top of the chimney zone, seismic attribute analysis revealed several high-amplitude anomalies up to [Formula: see text]. The anomalies were interpreted as reaccumulated thermogenic gas, and their distribution conforms to the stratigraphy and structure of the Quaternary interval, in that they occupy local fault-bounded footwall highs within remnant coarser-grained interfluvial zones, which are overlain by finer grained, transgressive deposits.

scholarly journals High-Resolution Temperature Variability Reconstructed from Black Pine Tree Ring Densities in Southern Spain

Atmosphere ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 748
Author(s):  
Jan Esper ◽  
Claudia Hartl ◽  
Ernesto Tejedor ◽  
Martin de Luis ◽  
Björn Günther ◽  
...  
Keyword(s):  
High Resolution ◽  
Tree Ring ◽  
Volcanic Eruptions ◽  
Temperature Variability ◽  
Southern Spain ◽  
Black Pine ◽  
Early 19Th Century ◽  
Pine Tree ◽  
Natural Park ◽  
Reconstructed Temperature

The presence of an ancient, high-elevation pine forest in the Natural Park of Sierras de Cazorla in southern Spain, including some trees reaching >700 years, stimulated efforts to develop high-resolution temperature reconstructions in an otherwise drought-dominated region. Here, we present a reconstruction of spring and fall temperature variability derived from black pine tree ring maximum densities reaching back to 1350 Coefficient of Efficiency (CE). The reconstruction is accompanied by large uncertainties resulting from low interseries correlations among the single trees and a limited number of reliable instrumental stations in the study region. The reconstructed temperature history reveals warm conditions during the early 16th and 19th centuries that were of similar magnitude to the warm temperatures recorded since the late 20th century. A sharp transition from cold conditions in the late 18th century (t1781–1810 = −1.15 °C ± 0.64 °C) to warm conditions in the early 19th century (t1818–1847 = −0.06 °C ± 0.49 °C) is centered around the 1815 Tambora eruption (t1816 = −2.1 °C ± 0.55 °C). The new reconstruction from southern Spain correlates significantly with high-resolution temperature histories from the Pyrenees located ~600 km north of the Cazorla Natural Park, an association that is temporally stable over the past 650 years (r1350–2005 > 0.3, p < 0.0001) and particularly strong in the high-frequency domain (rHF > 0.4). Yet, only a few of the reconstructed cold extremes (1453, 1601, 1816) coincide with large volcanic eruptions, suggesting that the severe cooling events in southern Spain are controlled by internal dynamics rather than external (volcanic) forcing.

High frequency water isotopes records during glacial/interglacial cycles on EPICA Dome C ice core.

2020 ◽  
Author(s):  
antoine Grisart ◽  
Bo Vinther ◽  
vasileos Gkinis ◽  
Trevor Popp ◽  
Barbara Stenni ◽  
...  
Keyword(s):  
High Resolution ◽  
High Frequency ◽  
New Records ◽  
Ice Core ◽  
Temperature Variability ◽  
Water Isotopes ◽  
Spectral Analyses ◽  
Marine Isotopic Stage ◽  
The Core ◽  
Several Intervals

&lt;p&gt;The iconic curve of &amp;#61540;D in water showing the 8 glacial/interglacial cycles from the EPICA Dome C ice&lt;br&gt;core is now a reference in paleoclimate. It shows past temperature variability back to 800 ka over the&lt;br&gt;3200 m deep ice core with a 55 cm resolution. However, the millennial and centennial scale&lt;br&gt;variability gets more challenging to observe in the deepest part of the core. Indeed, the time&lt;br&gt;resolution worsens when going deeper in the ice because of the ice thinning: it is larger than 200&lt;br&gt;years at 2500 m depth. Furthermore, isotopic diffusion affects the signal at the bottom of the ice&lt;br&gt;core. Pol et al., (2010) have thus shown that the sub-millennial MIS (Marine Isotopic Stage) 19 signal&lt;br&gt;(3157-3181 m deep) is erased because of diffusion and high resolution doesn&amp;#8217;t add any further&lt;br&gt;information at this depth. In this study we want to better characterize the increase of the isotopic&lt;br&gt;diffusion with depth by providing new high resolution water isotopes at several intervals over the&lt;br&gt;EPICA ice core (EDC).&lt;br&gt;We present here published high resolution (11 cm) d18O measurements over the EDC ice core as&lt;br&gt;well as new records of high resolution (11 cm) &amp;#61540;D over MIS 7;13 and 14). We use spectral analyses to&lt;br&gt;determine at which depth the isotopic diffusion erases the sub-millennial variability. We also show&lt;br&gt;that cold periods exhibit a larger variability of water isotopes than interglacial periods.&lt;br&gt;The information obtained here is crucial for the new project Beyond EPICA oldest ice core, which has&lt;br&gt;the goal of analyzing a 1.5 Ma old ice core. In the deepest part, 1 m of ice core could represent&lt;br&gt;10 000 years of climate archive.&lt;/p&gt;

Acquisition, processing and interpretation of high-resolution seismic data using a small-scale multi-channel system: an example from the Korea Strait inner shelf, south-east Korea

2016 ◽  
Vol 47 (4) ◽  
pp. 341-351 ◽  
Author(s):  
Dong-Geun Yoo ◽  
Nam-Hyung Koo ◽  
Ho-Young Lee ◽  
Byoung-Yeop Kim ◽  
Young-Jun Kim ◽  
...  
Keyword(s):  
High Resolution ◽  
Seismic Data ◽  
Small Scale ◽  
Inner Shelf ◽  
Channel System ◽  
Korea Strait
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