Is the simplest chemical reaction really so simple?

Abstract

Modern computational methods have become so powerful for predicting the outcome for the H + H2 → H2 + H bimolecular exchange reaction that it might seem further experiments are not needed. Nevertheless, experiments have led the way to cause theorists to look more deeply into this simplest of all chemical reactions. The findings are less simple.

Abrupt Bølling warming and ice saddle collapse contributions to the Meltwater Pulse 1a rapid sea level rise

“…Reconstructed North American ice sheet volume ranges from 23 × 10 6  km 3 to 35 × 10 6  km 3 at the LGM, equivalent to 60–88 m GMSLR [ Clark and Tarasov , 2014; Lambeck et al ., 2014; Peltier et al ., 2015; Tarasov et al ., 2012]. However, reconciling constraints on individual ice sheet volume with constraints on global sea level change is difficult (the so‐called “missing ice problem”) [ Clark and Tarasov , 2014].…”

“…Reconstructed North American ice sheet volume ranges from 23 × 10 6  km 3 to 35 × 10 6  km 3 at the LGM, equivalent to 60–88 m GMSLR [ Clark and Tarasov , 2014; Lambeck et al ., 2014; Peltier et al ., 2015; Tarasov et al ., 2012]. However, reconciling constraints on individual ice sheet volume with constraints on global sea level change is difficult (the so‐called “missing ice problem”) [ Clark and Tarasov , 2014]. Geologically constrained reconstructions suggest that the Antarctic ice sheet was responsible for 5–15 m GMSLR since the LGM [ Peltier et al ., 2015; Tarasov et al ., 2012; Whitehouse et al ., 2012; Clark and Tarasov , 2014].…”

“…However, reconciling constraints on individual ice sheet volume with constraints on global sea level change is difficult (the so‐called “missing ice problem”) [ Clark and Tarasov , 2014]. Geologically constrained reconstructions suggest that the Antarctic ice sheet was responsible for 5–15 m GMSLR since the LGM [ Peltier et al ., 2015; Tarasov et al ., 2012; Whitehouse et al ., 2012; Clark and Tarasov , 2014]. However, this is at least 8 m lower than the Antarctic GMSLR contribution (23 m) estimated by Lambeck et al .…”

“…However, this is at least 8 m lower than the Antarctic GMSLR contribution (23 m) estimated by Lambeck et al . [2014]. We therefore consider the possibility that the North American ice sheet is underestimated by up to 8 m in current reconstructions.…”

“…In total, this produced around 130 m of global mean sea level rise (GMSLR) [ Lambeck et al ., 2014], which was sometimes contributed to by major episodes of accelerated ice melt. Meltwater Pulse 1a (MWP1a) is the largest of these, identified as a 14–18 m of GMSLR in less than 340 years at 14.6 ka [ Deschamps et al ., 2012] in coral reef records from Tahiti and Barbados, as well as other sea level proxies around the world.…”