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Causes and Consequences of High Latitude Freshening in the North Atlantic

Causes and Consequences of High Latitude Freshening in the North Atlantic. Atlantic Ocean Salinity Changes 1990s compared to 1960s. from Curry et al . Nature (2003). Arctic FW budget. from Aagard & Carmack (1989). High latitude FW sources. Peterson et al. ( Science 2006).

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Causes and Consequences of High Latitude Freshening in the North Atlantic

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  1. Causes and Consequences of High Latitude Freshening in the North Atlantic

  2. Atlantic Ocean Salinity Changes1990s compared to 1960s from Curry et al. Nature (2003)

  3. Arctic FW budget from Aagard & Carmack (1989)

  4. High latitude FW sources Peterson et al. (Science 2006)

  5. FW Storage Anomalies:Nordic – Subpolar – Subtropical basins Nordic: 3,000 km3 Subpolar: 15,000 Subtropic: 7,000 km3 10,000 km3 Curry & Maurtizen, 2005; Peterson et al., 2006

  6. FW input vs. No Atlantic Storage anomalies P-E local ~30% of ocean storage anom For 1990s, FW source anoms: Sea Ice: 49% P-E: 43% Glaciers: 7% (incl Greenland) Peterson et al. (2006)

  7. FW Content Anomalies: Nordic/Subpolar Seasin HadCM3 Control simulation 25,000 km3 The observed FW storage changes are similar in amplitude to the natural variability diagnosed in HadCM3 Courtesy of Anne Pardaens, Hadley Centre

  8. Decline in sea ice is partly a consequence decadal variability in wind patterns and partly due to rising Arctic temperatures 1979 2000 NASA Goddard Space Flight Center

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