[A-CC33] Ice cores and paleoenvironmental modeling

[ACC33-07] How vegetation feedback in LIG climate affects on the Greenland ice sheet?

*Ryouta O'ishi¹, Fuyuki SAITO², Wing-Le Chan¹, Takashi Obase², Ayako Abe-Ouchi^1,2,3 (1.Atmosphere and Ocean Research Institute, the Universitoy of Tokyo, 2.JAMSTEC, 3.NIPR)

Keywords:Last Interglacial, Greenland Ice Sheet, vegetation feedback, AOV GCM

A sea level rise is an important topic in a future climate projection. In the past warm period known as the Last Interglacial (LIG), paleoevidences indicate a higher sea level by several meters
than the present-day. The most important characteristic of the LIG is summer solar irradiance induced by a different Earth's orbit from that of the present-day. The peak of summer solar irradiance at 65N is more than 70W/m² in the LIG than the present-day, which should affects on the surface mass balance ot fhe Greenland Ice Sheet.
Paleoclimate modeling community applies the results of paleoclimate experiments using GCM on ice sheet models and tries to reproduce past sea level rises. A recent study revealed that the atmosphere-ocean-seaice-vegetation feedback plays an important role in the Arctic climate. Vegetation change in the northern high latitudes occurs in response to stronger summer solar irradiance in the LIG, which amplifies Arctic warming throughout interseasonal ocean and sea-ice feedback. This result also indicates that not only the summer solar irradiance but also vegetation change affects on the response of the Greenland Ice Sheet in the LIG.
In the present study, we use the result of LIG experiments by MIROC4m (without vegetation feedback) and MIROC4m-LPJ (with vegetation feedback) as input to a 3-dimensional ice sheet model IcIES to evaluate the effect of vegetation change upon the Greenland Ice Sheet.