As a result, this will lead to an extra 17 centimetres of sea level rise by 2100.
polar scientists from 50 international organisations have produced the most
changes in the mass of the Greenland and Antarctic ice sheets between 1992 and
Altogether, data from 11 different satellite missions were used,
including measurements of the ice sheets’ changing volume, flow and gravity.
在同伴的两篇文章 性质， 节目
that Greenland and Antarctica lost 6.4 trillion tonnes of ice between 1992 and
2017 – pushing global sea levels up by 17.8 millimetres. Of
the total sea level rise, 10.6 millimetres (60%) was due to Greenland ice
losses and 7.2 millimetres (40%) was due to Antarctica.
by a factor six in just three decades, up from 81 billion tonnes per year in
assessment, led by 教授 Andrew Shepherd at the University of Leeds and 博士
Erik Ivins at NASA’s Jet Propulsion Laboratory in California, was supported by
the European Space Agency (ESA) and the US National Aeronautics and Space
their Fifth Assessment Report, the 在tergovernmental Panel on Climate Change
(IPCC) predicted that global sea levels will rise 53 centimetres by 2100, and
it is estimated that this would put 360 million people at risk of annual coastal
But the IMBIE Team’s studies shows that ice losses from both Antarctica
and Greenland are rising faster than expected, tracking the IPCC’s worst-case
An iceberg with melt point in the Bellingshausen Sea, Antarctica
Antarctica and Greenland continue to track the worst-case climate warming
scenario, they will cause an extra 17 centimetres of sea level rise by the end
would mean 400 million people are at risk of annual coastal flooding by 2100.
are not unlikely events with small impacts; they are already underway and will
from Antarctica - and half of that lost from Greenland - has been triggered by
oceans melting their outlet glaciers, which causes them to speed up. 该
remainder of Greenland’s ice losses are due rising air temperature, which has
losses from both ice sheets peaked at 552 billion tonnes per year in 2010 and
averaged 475 billion tonnes per year for the remainder of the decade. 该 peak
loss coincided with several years of intense surface melting in Greenland, and
last summer’s Arctic heatwave means that 2019 should set a new record for polar
ice sheet loss. Antarctica and Greenland are now losing ice five and seven
times faster than they were in the 1990s, respectively.
502 Bad Gateway
Ivins said: “Satellite observations of polar ice are essential for monitoring
and predicting how climate change could affect ice losses and sea level rise.
computer simulation allows us to make projections from climate change scenarios,
the satellite measurements provide prima facie, rather irrefutable, evidence.
project is a great example of the importance of international collaboration to
教授 of Glaciology at the University of Iceland and lead author of the
在tergovernmental Panel on Climate Change’s sixth assessment report, who was
Team’s reconciled estimate of Greenland and Antarctic ice loss is timely for
the IPCC. 该ir satellite observations show that both melting and ice discharge
from Greenland have increased since observations started.
ice caps in Iceland had similar reduction in ice loss in the last two years of
their record, but summer 2019 was very warm in this region which resulted in
higher mass loss. I would expect a similar increase in Greenland mass loss for
is very important to keep monitoring the big ice sheets to know how much they
Observation Programmes, Josef Aschbacher, comments: “的 findings reported by IMBIE
demonstrate the fundamental importance of using satellites to monitor the
evolution of ice sheets, and for evaluating models used to predict the effects of
Image credits: Hamish Pritchard and 教授 Andrew Shepherd