ملف:Recent Sea Level Rise.png

Recent_Sea_Level_Rise.png ‏(537 × 373 بكسل حجم الملف: 47 كيلوبايت، نوع MIME: image/png)

This figure shows the change in annually averaged sea level at 23 geologically stable tide gauge sites with long-term records as selected by Douglas (1997). The thick dark line is a three-year moving average of the instrumental records. These data indicate a sea level rise of ~27.5 cm from 1800-2000. Because of the limited geographic coverage of these records, it is not obvious whether the apparent decadal fluctuations represent true variations in global sea level or merely variations across regions that are not resolved.

For comparison, the recent annually averaged satellite altimetry data [1] from TOPEX/Poseidon are shown in red. These data indicate a somewhat higher rate of increase than tide gauge data, however the source of this discrepancy is not obvious. It may represent systematic error in the satellite record and/or incomplete geographic sampling in the tide gauge record. The month to month scatter on the satellite measurements is roughly the thickness of the plotted red curve.

Original data for this figure are from the Permanent Service for Mean Sea Level [2] (PSMSL). Douglas (1997), defined the following criteria for selecting records from the PSMSL which were long, reliable, and avoided large vertical geologic changes:

He subsequently identified 24 PSMSL records meeting all five of these criteria:

After slight corrections following Douglas (1997) for any remaining post-glacial rebound at these sites (typically ~3 cm/century), the tide gauge data from these sites were plotted in no particular order as the thin lines in the above figure. One site, Wellington, was omitted because the author of this figure was unable to locate the corresponding record from the PSMSL.

This figure was prepared from publicly available data by Robert A. Rohde and is incorporated into the Global Warming Art project.


Bruce C. Douglas (1997). "Global Sea Rise: A Redetermination". Surveys in Geophysics 18: 279–292. DOI:10.1023/A:1006544227856.


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Temperature changes during a similar period and possibly responsible for causing the observed sea level rise.
Sea level variations over the last nine thousand years