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25 results

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  • Glacier area changes in Novaya Zemlya from 1986–89 to 2019–21 using object-based image analysis in Google Earth Engine

  • Asim Ali, Paul Dunlop, Sonya Coleman, Dermot Kerr, Robert W. McNabb, Riko Noormets
  • Journal:
    Journal of Glaciology / Volume 69 / Issue 277 / October 2023
    Published online by Cambridge University Press:
    09 May 2023, pp. 1305-1316
    • Article
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  • Climate change has had a significant impact on glacier recession, particularly in the Arctic, where glacier meltwater is an important contributor to global sea-level rise. Therefore, it is important to accurately quantify glacier recession within this sensitive region, using multiple observations of glacier extent. In this study, we mapped 480 glaciers in Novaya Zemlya, Russian Arctic, using object-based image analysis applied to multispectral Landsat satellite imagery in Google Earth Engine and quantify the area changes between 1986–89 and 2019–21. The results show that in 1986–89, the total glacierized area was 22 990 ± 301 km2, in 2000–01 the area was 22 525 ± 308 km2 and by 2019–21 the glacier area reduced to 21 670 ± 292 km2, representing a total of 5.8% reduction in glacier area between 1986–89 and 2019–21. Higher glacier area loss was observed on the Barents Sea coast (7.3%) compared to the Kara (4.2%), reflecting previously observed differences in warming trends. The accuracy of the automatically generated outlines of each layer (1986–89, 2000–01 and 2019–21) was evaluated by comparing with manually corrected outlines (reference data) using random sampling, resulting in an overall accuracy estimate of between 96 and 97% compared to the reference data. This automated approach in Google Earth Engine is a promising tool for rapidly mapping glacier change that reduces the amount of time required to generate accurate glacier outlines.

George Eliot and Money
  • Economics, Ethics and Literature
  • Dermot Coleman
  • Published online:
    05 July 2014
    Print publication:
    24 April 2014
  • Unlike other Victorian novelists George Eliot rarely incorporated stock market speculation and fraud into her plots, but meditations on money, finance and economics, in relation both to individual ethics and to wider social implications, infuse her novels. This volume examines Eliot's understanding of money and economics, its bearing on her moral and political thought, and the ways in which she incorporated that thought into her novels. It offers a detailed account of Eliot's intellectual engagements with political economy, utilitarianism, and the new liberalism of the 1870s, and also her practical dealings with money through her management of household and business finances and, in later years, her considerable investments in stocks and shares. In a wider context, it presents a detailed study of the ethics of economics in nineteenth-century England, tracing the often uncomfortable relationship between morality and economic utility experienced by intellectuals of the period.

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