how much could sea level rise in the 21st century
Future sea level The Intergovernmental Panel on Climate Change (2007)[1] projected sea level would reach 0.18 to 0.59 m above present by the end of the 21st century but lacked an estimate of ice flow dynamics calving.[2][3] Calving was added by Pfeffer et al. (2008)[4] indicating 0.8 to 2 m of SLR by 2100 (favouring the low end of this range). Rahmstorf (2007)[5] estimated SLR will reach 0.5 to 1.4 m by the end of the century. Pielke (2008)[6] points out that observed SLR has exceeded the best case projections thus far. These approximations and others indicate that global mean SLR may reach 1 m by the end of this century. However, sea level is highly variable and planners considering local impacts must take this variability into account.
Atmospheric pressure The highest adjusted-to-sea level barometric pressure ever recorded on Earth (above 750 meters) was 1084.8 hPa (32.03 inHg) measured in Tosontsengel, Mongolia on 19 December 2001.[7] The highest adjusted-to-sea level barometric pressure ever recorded (below 750 meters) was at Agata in Evenk Autonomous Okrug, Russia (66°53’ N, 93°28’ E, elevation: 261 m, 856 ft) on 31 December 1968 of 1083.8 hPa (32.005 inHg).[8] The discrimination is due to the problematic assumptions (assuming a standard lapse rate) associated with reduction of sea level from high elevations.[7]