Arctic Siberian shelf environments—an introduction

Bauch, Henning A.; Kassens, Heidemarie

doi:10.1016/j.gloplacha.2004.12.003

Cited by 13 publications

(4 citation statements)

References 22 publications

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“…ESAS sedimentation is unique because of the intense supply from riverine runoff and coastal erosion [ Vetrov and Romankevich , 2004; Dudarev et al , 2006; Rachold et al , 2006]. As a result, an enormous amount of organic‐rich sediments arrive at the shelf and accumulate within its sedimentary basins [ Kleiber and Niessen , 2000; Bauch and Kassens , 2005]. The distribution pattern of the surface sediments varies significantly within the ESAS.…”

Section: Regional Settingmentioning

confidence: 99%

Geochemical and geophysical evidence of methane release over the East Siberian Arctic Shelf

et al. 2010

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[1] The East Siberian Arctic Shelf (ESAS), which includes the Laptev Sea, the East Siberian Sea, and the Russian part of the Chukchi Sea, has not been considered to be a methane (CH 4 ) source to hydrosphere or atmosphere because subsea permafrost, which underlies most of the ESAS, was believed, first, not to be conducive to methanogenesis and, second, to act as an impermeable lid, preventing CH 4 escape through the seabed. Here recent observational data obtained during summer (2005)(2006) and winter (2007) expeditions indicate the ubiquitous presence of elevated dissolved CH 4 and an elevated atmospheric CH 4 mixing ratio. The CH 4 data were also analyzed together with high resolution seismic (HRS) data obtained by means of a "Sonic M-141" system consisting of a high-resolution profiler and side-scan sonar mounted in a towed fish during the Transdrift-X Expedition (2004) onboard the R/V Yakov Smirnitskiy. Results show anomalously high concentrations of dissolved CH 4 (up to 5 mM) and an episodically (nongradually) increasing atmospheric mixing ratio of CH 4 (up to 8.2 ppm) in some areas of the ESAS. A most likely source is yearround CH 4 release through taliks (columns of thawed sediments within permafrost) from seabed CH 4 reservoirs such as shallow hydrates and geological sources. Such releases occur not only within the areas underlain by fault zones but also outside of them. This points to permafrost's failure to further preserve CH 4 deposits in the ESAS. The total amount of carbon preserved within the ESAS as organic matter and ready to release CH 4 from seabed deposits is predicted to be ∼1400 Gt. Release of only a small fraction of this reservoir, which was sealed with impermeable permafrost for thousands of years, would significantly alter the annual CH 4 budget and have global implications, because the shallowness of the ESAS allows the majority of CH 4 to pass through the water column and escape to the atmosphere.

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Section: Regional Settingmentioning

confidence: 99%

Geochemical and geophysical evidence of methane release over the East Siberian Arctic Shelf

et al. 2010

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“…1). It is cut by several paleoriver valleys formed in the Pleistocene during times of sea-level lowstands (Bauch et al, , 2001bBauch and Kassens, 2005;Darby et al, 2006). The shelf hydrography is characterized by the interaction of freshwater input from large Siberian rivers, primarily the Lena River, cold brines produced from sea-ice formation, and meltwater input during summer sea-ice melting.…”

Section: Modern Settingmentioning

confidence: 99%

Benthic and planktic community changes at the North Siberian margin in response to Atlantic water mass variability since last deglacial times

Taldenkova

Bauch

Stepanova

et al. 2012

Marine Micropaleontology

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“…Sea ice in the Arctic is the top layer of the 'halocline', a 200-300 m thick layer of low salinity, but also very low temperatures, close to´2˝C [35]. It is modelled as a layer of salty ice (20-30 psu), typically 2 to 3 m thick, and in some regions up to 4 to 5 m thick, at´2˝C on top of the sea water.…”

Section: D) Sea Icementioning

confidence: 99%

Microwave Imaging Radiometers by Aperture Synthesis—Performance Simulator (Part 1): Radiative Transfer Module

et al. 2016

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Abstract:The Synthetic Aperture Interferometric Radiometer Performance Simulator (SAIRPS) is a three-year project sponsored by the European Space Agency (ESA) to develop a completely generic end-to-end performance simulator of arbitrary synthetic aperture interferometric radiometers. This means, on one side, a generic radiative transfer module from 1 to 100 GHz, including land and ocean covers, as well as a fully 3D atmosphere and Faraday ionospheric rotation based on variable TEC. On the other hand, the instrument can have an arbitrary array topology (number of antenna elements, and their time-dependent position and orientation). Receivers' topology can also be modified, starting from a very generic one to connecting and disconnecting subsystems, whose parameters can be individually configured. These parameters can be defined either by mathematical functions or by input data files, including the frequency and temperature dependence. Generic calibration and image reconstruction algorithms that are suitable for arbitrary array topologies have also been implemented, as well as tools to compute the instrument performance metrics, i.e., radiometric accuracy, sensitivity, angular resolution, etc. This manuscript presents the generic architecture of the SAIRPS, the algorithms implemented in the Radiative Transfer Module, and simulation results showing its performance. A companion manuscript (Part II) describes the instrument and calibration modelling, the image reconstruction algorithms, and the validation tests that were performed.

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Arctic Siberian shelf environments—an introduction

Cited by 13 publications

References 22 publications

Geochemical and geophysical evidence of methane release over the East Siberian Arctic Shelf

Geochemical and geophysical evidence of methane release over the East Siberian Arctic Shelf

Benthic and planktic community changes at the North Siberian margin in response to Atlantic water mass variability since last deglacial times

Microwave Imaging Radiometers by Aperture Synthesis—Performance Simulator (Part 1): Radiative Transfer Module

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