Ozone absorbs in the infrared ir part of the spectrum

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Unformatted text preview: ted 1. the series of global mean sea level (deviation global n1980-1999 mean) in the past and as projectedthe uncertainty in the estimated long-term rate of sea level ot available. The grey shading shows for the future. For the period before 1870, global measurements of seaare from tide gaugeThe grey shading shows 1990s, from satellite change. Instrumental records level are not available. records and, since the he uncertainty in the estimated long-term rate of sea level change atltimetry. Uncertainties in future projections result from (Section 6.4.3). of different emission the assumption The red line is a reconstruction of global mean sea level from tide gauges (Section scenarios for greenhouse gases, mainly CO2. (source: IPCC report), and the red shading denotes the range of variations from a smooth curve. The green line shows global mean sea level observed from satellite altimetry. The 18.3shading represents the range of model projections for the SRES A1B scenario blue Global Warming and Sea Level Rise for the 21st century, relative to the 1980 to 1999 mean, and has been calculated independently from the observations. Beyond 2100, the projections are increasingly Rising temperatures lead to thermal expansion of the water in the oceans dependent on the emissions scenario (see Chapter 10 for a discussion of sea level melting of glaciers considered in this Both results in a rise or rise projections for other scenariosand ice Over many centuries in sea level. millennia, seao Icould rise by several metres (Sectionlevel has risen by 15cm level n last 100 years, global sea 10.7.4). o o o o and Estimated contributions to sea level rise: thermal expansion: 30% 409 melting of glaciers: 20% melting of Greenland ice sheet: 20% melting of Antarctic ice sheet: unknown but likely large NB: the melting of sea ice (icebergs) does not contribute to sea level rise! The icebergs floating in seawater already displace the seawater of equivalent weight. So when the icebergs melt, they displa...
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