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Communications and Computer Security
Number of Followers: 9

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ISSN (Print) 1925-7872 - ISSN (Online) 1925-7880
Published by ACTA Press

[4 journals]

A reconstructed South Atlantic Meridional Overturning Circulation time
series since 1870
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  Authors: Hosmay Lopez; Gustavo Goni, Shenfu Dong
  Abstract: This study reconstructs a century-long South Atlantic Meridional Overturning Circulation (SAMOC) index. The reconstruction is possible due to its covariability with sea surface temperature (SST). A singular value decomposition (SVD) method is applied to the correlation matrix of SST and SAMOC. The SVD is performed on the trained period (1993-present) for which Expendable Bathythermographs (XBT) and satellite altimetry observations are available. The joint modes obtained are used in the reconstruction of a monthly SAMOC timeseries from 1870 to present. The reconstructed index is highly correlated to the observational-based SAMOC timeseries during the trained period and provides a long historical estimate. It is shown that the Interdecadal Pacific Oscillation (IPO) is the leading mode of SAMOC-SST covariability, explaining ~85% with the Atlantic Niño accounting for less than 10%. The reconstruction shows that SAMOC has recently shifted to an anomalous positive period, consistent with a recent positive shift of the IPO.
  PubDate: 2017-03-30T20:00:33.954967-05:
  DOI: 10.1002/2017GL073227
Pore pressure migration during hydraulic stimulation due to permeability
enhancement by low-pressure subcritical fracture slip
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  Authors: Yusuke Mukuhira; Hirokazu Moriya, Takatoshi Ito, Hiroshi Asanuma, Markus Häring
  Abstract: Understanding the details of pressure migration during hydraulic stimulation is important for the design of an energy extraction system and reservoir management, as well as for the mitigation of hazardous induced seismicity. Based on microseismic and regional stress information, we estimated the pore pressure increase required to generate shear slip on an existing fracture during stimulation. Spatiotemporal analysis of pore pressure migration revealed that lower pore pressure migrates further and faster, and that higher pore pressure migrates more slowly. These phenomena can be explained by the relationship between fracture permeability and stress state criticality. Subcritical fractures experience shear slip following smaller increases of pore pressure and promote migration of pore pressure because of their enhanced permeability. The difference in migration rates between lower and higher pore pressures suggests that the optimum wellhead pressure is the one that can stimulate relatively permeable fractures, selectively. Its selec
  PubDate: 2017-03-30T20:00:30.668435-05:
  DOI: 10.1002/2017GL072809