News
December 5, 2018
Calving is an important mechanism that controls the dynamics of Greenland outlet glaciers. We test and compare four calving laws and assess which calving law has better predictive abilities. Overall, the calving law based on von Mises stress is more satisfactory than other laws, but new parameterizations should be derived to better capture the detailed processes involved in calving. read this article

November 13, 2018
New Cryosphere paper exploring the uncertainty in continental Antarctic Ice Sheet projections read this article

October 31, 2018
Warming over the Greenland Ice Sheet could impact ice dynamics within the shear margins of outlet glaciers like Jakobshavn Isbræ through enhanced infiltration of surface melt which could refreeze within the ice column through cryo-hydrologic warming. Surface melt could infiltrate to the bed resulting in basal sliding and increased mass flux. We investigate how drainage from water-filled crevasse ponds impact regional ice flow. read this article

October 25, 2018
The Subglacial hydrology model intercomparison project gives an overview of the current existing models that can compute the effective pressure at the base of glaciers. The intercomparison concluded that the different approached give consistent results across models. Simple models can be used in a number of cases including steady states and seasonly evolving scenarios. However, when dealing with shorter time scales the use of a complex model should be preferred. read this article

October 1, 2018
New Cryosphere paper assesses the importance of sub-element parameterization of basal melt to capture grounding line motion read this article

August 17, 2018
Deglaciation of the Scandinavian Ice Sheet modeled by ISSM. Simulations show that the fjord geometry controls deglacial retreat history of western Norway. The ocean warming triggers initial grounding line retreat, while sustained atmospheric warming is required to drive long-term deglaciation. Individual fjord glaciers retreat out-of-phase with climate forcing. read this article

April 25, 2018
Simulations of the ice velocity and thickness changes of Upernavik Isstrøm (north-western Greenland) are performed by prescribing a collection of 27 observed terminus positions spanning 164 years (1849– 2012). The simulation shows increased ice velocity during the 1930s, the late 1970s and between 1995 and 2012 when terminus retreat was observed along with negative surface mass balance anomalies. Three distinct mass balance states are evident in the reconstruction: (1849–1932) with near zero mass balance, (1932–1992) with ice mass loss dominated by ice dynamical flow, and (1998–2012), when increased retreat and negative surface mass balance anomalies led to mass loss that was twice that of any earlier period. Over the multi-decadal simulation, mass loss was dominated by thin- ning and acceleration responsible for 70 % of the total mass loss induced by prescribed change in terminus position. The remaining 30 % of the total ice mass loss resulted directly from prescribed terminus retreat and decreasing surface mass balance. read this article

April 25, 2018
initMIP-Greenland is the first in a series of ice sheet model intercomparison activities within ISMIP6 (the Ice Sheet Model Intercomparison Project for CMIP6), which is the primary activity within the Coupled Model Intercom- parison Project Phase 6 (CMIP6) focusing on the ice sheets. Two experiments for the large-scale Greenland ice sheet have been designed to allow intercomparison between participat- ing models of (1) the initial present-day state of the ice sheet and (2) the response in two idealised forward experiments. read this article

February 1, 2018
The University of Hawaii Sea Level Center, in collaboration with the NASA Jet Propulsion Laboratory and University of California at Irvine will host the 2018 Sheet System Model (ISSM) Sea Level Workshop. This will be the first time an ISSM workshop is dedicated to Sea-Level Science. Within this context, the workshop will take place June 11-12 at the at the East-West Center on the campus of the University of Hawaii at Manoa. It will be hosted by Pr. Phil Thompson of the University of Hawaii Sea Level Center and sponsored by the N-SLCT NASA Science Team. read this article