Greenland climate simulations show high Eemian surface melt which could explain reduced total air content in ice cores
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
Greenland climate simulations show high Eemian surface melt which could explain reduced total air content in ice cores. / Plach, Andreas; Vinther, Bo M.; Nisancioglu, Kerim H.; Vudayagiri, Sindhu; Blunier, Thomas.
In: Climate of the Past, Vol. 17, No. 1, 29.01.2021, p. 317-330.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Greenland climate simulations show high Eemian surface melt which could explain reduced total air content in ice cores
AU - Plach, Andreas
AU - Vinther, Bo M.
AU - Nisancioglu, Kerim H.
AU - Vudayagiri, Sindhu
AU - Blunier, Thomas
PY - 2021/1/29
Y1 - 2021/1/29
N2 - This study presents simulations of Greenland surface melt for the Eemian interglacial period (similar to 130 000 to 115 000 years ago) derived from regional climate simulations with a coupled surface energy balance model. Surface melt is of high relevance due to its potential effect on ice core observations, e.g., lowering the preserved total air content (TAC) used to infer past surface elevation. An investigation of surface melt is particularly interesting for warm periods with high surface melt, such as the Eemian interglacial period. Furthermore, Eemian ice is the deepest and most compressed ice preserved on Greenland, resulting in our inability to identify melt layers visually. Therefore, simulating Eemian melt rates and associated melt layers is beneficial to improve the reconstruction of past surface elevation. Estimated TAC, based on simulated melt during the Eemian, could explain the lower TAC observations. The simulations show Eemian surface melt at all deep Greenland ice core locations and an average of up to similar to 30 melt days per year at Dye-3, corresponding to more than 600 mm water equivalent (w.e.) of annual melt. For higher ice sheet locations, between 60 and 150 mmw.e.yr(-1) on average are simulated. At the summit of Greenland, this yields a refreezing ratio of more than 25 % of the annual accumulation. As a consequence, high melt rates during warm periods should be considered when interpreting Greenland TAC fluctuations as surface elevation changes. In addition to estimating the influence of melt on past TAC in ice cores, the simulated surface melt could potentially be used to identify coring locations where Greenland ice is best preserved.
AB - This study presents simulations of Greenland surface melt for the Eemian interglacial period (similar to 130 000 to 115 000 years ago) derived from regional climate simulations with a coupled surface energy balance model. Surface melt is of high relevance due to its potential effect on ice core observations, e.g., lowering the preserved total air content (TAC) used to infer past surface elevation. An investigation of surface melt is particularly interesting for warm periods with high surface melt, such as the Eemian interglacial period. Furthermore, Eemian ice is the deepest and most compressed ice preserved on Greenland, resulting in our inability to identify melt layers visually. Therefore, simulating Eemian melt rates and associated melt layers is beneficial to improve the reconstruction of past surface elevation. Estimated TAC, based on simulated melt during the Eemian, could explain the lower TAC observations. The simulations show Eemian surface melt at all deep Greenland ice core locations and an average of up to similar to 30 melt days per year at Dye-3, corresponding to more than 600 mm water equivalent (w.e.) of annual melt. For higher ice sheet locations, between 60 and 150 mmw.e.yr(-1) on average are simulated. At the summit of Greenland, this yields a refreezing ratio of more than 25 % of the annual accumulation. As a consequence, high melt rates during warm periods should be considered when interpreting Greenland TAC fluctuations as surface elevation changes. In addition to estimating the influence of melt on past TAC in ice cores, the simulated surface melt could potentially be used to identify coring locations where Greenland ice is best preserved.
KW - MASS-BALANCE
KW - SHEET
KW - MODEL
KW - INSOLATION
KW - RECORD
KW - RECONSTRUCTIONS
KW - PARAMETERS
KW - VERSION
KW - DRIVE
U2 - 10.5194/cp-17-317-2021
DO - 10.5194/cp-17-317-2021
M3 - Journal article
VL - 17
SP - 317
EP - 330
JO - Climate of the Past
JF - Climate of the Past
SN - 1814-9324
IS - 1
ER -
ID: 259107523