Not exact matches
That estimate was
based in part on the fact that sea level is now rising 3.2 mm / yr (3.2 m / millennium)[57], an order of magnitude faster than the rate during the prior several thousand years, with rapid
change of
ice sheet
mass balance over the past few decades [23] and Greenland and Antarctica now losing
mass at accelerating rates [23]--[24].
Both the observations of
mass balance and the estimates
based on temperature
changes (Table 11.4) indicate a reduction of
mass of glaciers and
ice caps in the recent past, giving a contribution to global - average sea level of 0.2 to 0.4 mm / yr over the last hundred years.
Pokrovsky predicts a further acceleration of melting of the thin
ice and in general greater
ice loss compared to his June prediction; this
change is
based on the increase in the sea surface temperature (SST) anomalies in the North Atlantic and the presence of hot air
masses over Siberia and the Russian Arctic.
That estimate was
based in part on the fact that sea level is now rising 3.2 mm / yr (3.2 m / millennium)[57], an order of magnitude faster than the rate during the prior several thousand years, with rapid
change of
ice sheet
mass balance over the past few decades [23] and Greenland and Antarctica now losing
mass at accelerating rates [23]--[24].
There is also no
basis on which to postulate significant
change in
ice mass for those epochs.
Hansen and Sato (7) argue that the climate of the most recent few decades is probably warmer than prior Holocene levels,
based on the fact that the major
ice sheets in both hemispheres are presently losing
mass rapidly (9) and global sea level is rising at a rate of more than 3 m / millennium (25), which is much greater than the slow rate of sea level
change (less than 1 m / millennium) in the latter half of the Holocene (26).
Studies
based on satellite observations do not provide unequivocal evidence concerning the
mass balance of the East Antarctic
ice sheet; some appear to indicate marginal thickening (Davis et al., 2005), while others indicate little
change (Zwally et al., 2005; Velicogna and Wahr, 2006; Wingham et al., 2006).