The Greenland and Antarctic ice sheets under 1.5 °C global warming

摘要: Even if anthropogenic warming were constrained to less than 2 °C above pre-industrial, the Greenland and Antarctic ice sheets will continue lose mass this century, with rates similar those observed over past decade. However, nonlinear responses cannot be excluded, which may lead larger of loss. Furthermore, large uncertainties in future projections still remain, pertaining knowledge gaps atmospheric (Greenland) oceanic (Antarctica) forcing. On millennial timescales, both have tipping points at or slightly 1.5–2.0 threshold; for Greenland, irreversible loss due surface balance–elevation feedback, whereas Antarctica, could result a collapse major drainage basins ice-shelf weakening.