Spatial Impacts of Climate Change. Denis Mercier

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1999-2009 and 252 ± 26 Gt per year in 2009-2017 (Rignot et al. 2019; see Figure 2.8).

Photos depict the mass balance of the Antarctic ice sheet.

      Figure 2.8. Mass balance of the Antarctic ice sheet. For a color version of this figure, see www.iste.co.uk/mercier/climate.zip

      COMMENT ON FIGURE 2.8.- The size of the circle is proportional to the absolute magnitude of the anomaly in D (dD = SMB1979-2008 - D) or SMB (dSMB = SMB - SMB1979-2008). The color of the circle indicates a loss in dD (dark red) or dSMB (light red) relative to a gain in dD (dark blue) or dSMB (light blue) in billions of tons (1,012 kg) per year. The dark color refers to dD; the light color refers to dSMB. The graphs show totals for Antarctica, Antarctic Peninsula, West Antarctica and East Antarctica. The bottom is the total mass balance distributed over the catchments with a color code ranging from red (loss) to blue (gain) (source: Rignot et al. 2019).

      2.4.2. The melting of mountain glaciers

      The World Glacier Monitoring Service (WGMS) provides standardized statistical data, such as ice front variations and mass balances1.

Bar chart depict the annual mass balance of reference glaciers with more than 30 years of glaciological measurements from 1950 to 2018.

      (source: Zemp et al. 2017)

      Data at regional scales show that all of the world's glaciated mountain areas have been melting over the last few decades. Glaciers in North America and Central Europe are suffering the greatest losses. Between 2006 and 2015, the world's other glaciers melted at an average rate of 220 ± 30 billion tons per year, equivalent to 0.61 ± 0.08 mm per year in sea level rise (IPCC 2019).

Graph depicts the cumulative mass changes from 1976 for regional and global averages based on reference glacier data.

      (source: Zemp et al. 2017)

Photos depict the area and thickness of the austre lovenbreen glacier simulated for different years.

      (source: Wang et al. 2019)

Photo depicts the austre lovenbreen glacier in northwestern Spitsbergen in the background.

      (source: © photo by D. Mercier taken on August 24, 2017)

      2.4.3. Decreasing permafrost

      2.4.4. Melting snow

      The decrease in land snow cover extent in June for the Arctic was 13.4 ± 5.4% per decade between 1967 and 2018, a total loss of approximately 2.5 million km2, mainly due to the increase in surface air temperature (IPCC 2019).

      2.5.1.

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