Interruption of two decades of Jakobshavn Isbrae acceleration and thinning as regional ocean cools

  title={Interruption of two decades of Jakobshavn Isbrae acceleration and thinning as regional ocean cools},
  author={Ala Khazendar and Ian G. Fenty and Dustin Carroll and Alex S. Gardner and Craig M. Lee and Ichiro Fukumori and Ou Wang and Hong Zhang and H{\'e}l{\`e}ne Seroussi and Delwyn K. Moller and Brice P. Y. No{\"e}l and Michiel R. van den Broeke and Steve J. Dinardo and Josh K. Willis},
  journal={Nature Geoscience},
Jakobshavn Isbrae has been the single largest source of mass loss from the Greenland Ice Sheet over the last 20 years. During that time, it has been retreating, accelerating and thinning. Here we use airborne altimetry and satellite imagery to show that since 2016 Jakobshavn has been re-advancing, slowing and thickening. We link these changes to concurrent cooling of ocean waters in Disko Bay that spill over into Ilulissat Icefjord. Ocean temperatures in the bay’s upper 250 m have cooled to… 

A Decade of Variability on Jakobshavn Isbrae: Ocean Temperatures Pace Speed Through Influence on Mélange Rigidity

Abstract. The speed of Greenland’s fastest glacier, Jakobshavn Isbrae, has varied substantially since its speedup in the late 1990s. Here we present observations of surface velocity, mélange

A Decade of Variability on Jakobshavn Isbrae: Ocean Temperatures Pace Speed Through Influence on Mélange Rigidity.

The results suggest that the ocean's dominant influence on Jakobshavn Isbrae is through its effect on winter mélange rigidity, rather than summer submarine melting.

Multi-decadal retreat of marine-terminating outlet glaciers in northwest and central-west Greenland

Abstract. The retreat and acceleration of marine-terminating outlet glaciers in Greenland over the past two decades has been widely attributed to climate change. Here we present a comprehensive

Ocean forcing drives glacier retreat in Greenland

This work investigates how AW influenced retreat at 226 marine-terminating glaciers using ocean modeling, remote sensing, and in situ observations to identify 74 glaciers in deep fjords with AW controlling 49% of the mass loss that retreated when warming increased undercutting.

A reconstruction of warm-water inflow to Upernavik Isstrøm since 1925 CE and its relation to glacier retreat

Abstract. The mass loss from the Greenland Ice Sheet has increased over the past 2 decades. Marine-terminating glaciers contribute significantly to this mass loss due to increased melting and ice

Interactive comment on “A Decade of Variability on Jakobshavn Isbrae: Ocean Temperatures Pace Speed Through Influence on Mélange Rigidity” by

Joughin et al. presents here a manuscript about the variability of Jakobshavn Isbrae using dense time series of speed and surface elevation over the period 2009-2019. The main conclusion is that the

Dynamic ice loss from the Greenland Ice Sheet driven by sustained glacier retreat

The Greenland Ice Sheet is losing mass at accelerated rates in the 21st century, making it the largest single contributor to rising sea levels. Faster flow of outlet glaciers has substantially

Centennial response of Greenland’s three largest outlet glaciers

Historical photographs are used to calculate ice loss from 1880–2012 for Jakobshavn, Helheim, and Kangerlussuaq glacier to infer that projections forced by RCP8.5 underestimate glacier mass loss which could exceed this worst-case scenario.

Helheim Glacier Poised for Dramatic Retreat

Helheim Glacier, one of the largest marine‐terminating outlet glaciers draining the Greenland Ice Sheet, underwent significant retreat and acceleration in the early 2000s, accounting for an



Acceleration of Jakobshavn Isbræ triggered by warm subsurface ocean waters

Observations over past decades show a sudden switch of Jakobshavn Isbrae—a large outlet glacier feeding a deep-ocean fjord on Greenland’s west coast—from slow thickening to rapid thinning in 1997.

Investigation of surface melting and dynamic thinning on Jakobshavn Isbrae, Greenland

Jakobshavn Isbrae is the most active glacier in Greenland, with an annual discharge of about 30 km 3 of ice, and it is one of the few recently surveyed glaciers to thicken between 1993 and 1998,

Intermittent thinning of Jakobshavn Isbræ, West Greenland, since the Little Ice Age

Abstract Rapid thinning and velocity increase on major Greenland outlet glaciers during the last two decades may indicate that these glaciers became unstable as a consequence of the Jakobshavn effect

Seasonal to decadal scale variations in the surface velocity of Jakobshavn Isbrae, Greenland: Observation and model-based analysis

[1] Using new data, we build upon the nearly two-decade long record of observations from Jakobshavn Isbrae to investigate the processes driving its dynamic evolution. While winter flow speed has not

A 100 yr record of ocean temperature control on the stability of Jakobshavn Isbrae, West Greenland

An understanding of the interaction between ice sheet dynamics and forcing mechanisms, such as oceanic and atmospheric circulation, is important because of the potential contribution of these

Continued retreat of Thwaites Glacier, West Antarctica, controlled by bed topography and ocean circulation

The Amundsen Sea sector is experiencing the largest mass loss, glacier acceleration, and grounding line retreat in Antarctica. Enhanced intrusion of Circumpolar Deep Water onto the continental shelf

21st-Century Evolution of Greenland Outlet Glacier Velocities

A decade-long compilation of velocity data for Greenland’s outlet glaciers shows complex spatial and temporal variability, implying that sea level rise over the next century may be less than the 2 meters that have been suggested.

Continued evolution of Jakobshavn Isbrae following its rapid speedup

[1] Several new data sets reveal that thinning and speedup of Jakobshavn Isbrae continue, following its recent rapid increase in speed as its floating ice tongue disintegrated. The present speedup

Submarine melting of the 1985 Jakobshavn Isbræ floating tongue and the triggering of the current retreat

[1] Photogrammetric reanalysis of 1985 aerial photos has revealed substantial submarine melting of the floating ice tongue of Jakobshavn Isbrae, west Greenland. The thickness of the floating tongue

Seasonal and interannual variations in ice melange and its impact on terminus stability, Jakobshavn Isbræ, Greenland

Abstract We used satellite-derived surface temperatures and time-lapse photography to infer temporal variations in the proglacial ice melange at Jakobshavn Isbræ, a large and rapidly retreating