In another thread I murmured something about asymmetric climate problems at the end of the last ice age. Here, I’ll show three studies that form a big conflict together around a sudden sea level rise that is known as “Melt Water Pulse 1A”. Curiously enough one person, Prof Clark of the Oregon Uni, (co)authored all three of these papers. So I wonder if he wonders about those problems. Let’s start with the most recent one. Clark et al (2004), Rapid Rise of Sea Level 19,000 Years Ago and Its Global Implications. Science 21 May 2004: 1141-1144 In which it is shown that clear geologic evidence exists that the great melting at the end of the ice ages started 19,000 years ago, which is a bit odd since the ice cores of Antarctica did not start to show any warming before 17,300 years ago, whilst the Greenland Ice cores waited until some 14,600 years ago. So Clark et al contend: We have two remarkable things here that the warming began some 2000 years before the CO2 rose, which is held responsible for a large role in that warming and second, that it was Antarctica that warmed and hence started to melt. Let’s keep that in mind when we look at a second study about that Meltwater Pulse 1A. Weaver A.J. et al (2003) Meltwater Pulse 1A from Antarctica as a Trigger of the Bølling-Allerød Warm Interval 14 March 2003 Vol 299 Science pp1710 - 1713 That’s pretty clear. If you scan the article you’ll see that Clark is amongst the authors and it’s also mentioned again that the warming in the south started as early as 19000 years ago. BTW this is not the only study that gives Meltwater Pulse 1A an Antarctic origin. Also keep in mind that the current ice sheet of Greenland, central in the public interest, is good for a sea level rise of 7 meters. Apparently, Meltwater Pulse 1A was equivalent to the melting of almost three Greenland ice sheets within 500 years. But now the third study: Clark P.U. and Mix A.C (2002) Ice sheets and sea level of the Last Glacial Maximum, Quaternary Science Reviews 21 (2002) 1–7 We are interested in table 1 about the contribution of the several Ice sheets to the sea level rise. For Antarctica we see a series of 24,5 meters from the oldest studies to 14,0 meters in the more recent studies. Given the fact that there is hardly any tectonic post glacial rebound at Antarctica, that only land ice counts and that there is no room whatsoever to have 2-3 additional Greenland Ice sheets anywhere on the Antarctic continental shelf, 14 meters does seem to be quite a bit already. Now as the melting apparently started 19,000 years ago and lasted several thousand years as the end of the Ice age is marked at 11,600 years ago, you’d expect only millimetres per year from Antarctica but no, it was 20 meters in 500 years, meltwater pulse 1A. But how can you write all those papers and not even mention that problem?