greenland ice extent dmi
This was preceeded by a graphic showing the differences between two NOAA SIE graphics aserting "Arctic sea ice extent is up 16% from last year.". Greenland on the whole is losing ice, as confirmed by multiple satellite and on the ground field measurements.
Read more about how ice sheets are changing in the Ice Sheet indicator. NASA have a fascinating article Greenland's Ice Island Alarm which looks at the difficulties of measuring ice loss in Greenland and how different techniques using different date (eg - satellites measuring gravity or surface height changes) all agree that Greenland is losing between 150 to 180 gigatonnes of ice per year. Copernicus is the European Union's Earth Observation Programme, looking at our planet and its environment for the ultimate benefit of all European citizens.
The maps are either based on satellite images or reconnaissance flights from Greenland.
As one who spent many years as a professional cartographer, this statement (and your closing paragraph) are spot-on. This makes many of the posts above look silly. ESOTC 2019 | Climate in 2019 | Spotlight on ... About the European State of the Climate 2019, Wet end to the year in western and southern Europe. I've noticed new claims that Greenland is gaining ice. This can be determined statistically. The top plot shows air temperature as a difference from average, relative to 1981 to 2010, for the period of June 21 through August 1, 2020, in degrees Celsius. (I personally do not wish visit Heller's blog to find out.). However, SMB doesnt take acount of calving losses which are what determine ice sheet mass. The daily image update isn’t current; why? However, I will assume you are interested in net Ice Mass as that has been your interest up-thread and that would be roughly equal annually to 0.01% of the total ice mass. Your statement does not appear to be backed by the ice mass data seen here. Sea ice maps from the Danish Meteorological Institute. In general, the best available science tells us that Greenland is losing ice extensively (Figure 1) and that these losses have drastically increased since the year 2000.
The paragraph Ceddars quoted correctly describes that more snow falls each year than melts (I think in 2012 more snow melted but most years more snow falls than melts). However, last mass graph.. doesnt look so hopeful, but we are all waiting for Grace-FO to provide data for the current situation. Credit: National Snow and Ice Data CenterHigh-resolution image. Warm foen winds cause extreme melting when in contact with ice. Credit: Jason Box, Programme for Monitoring of the Greenland Ice SheetHigh-resolution image. In the case of the GRACE data of total Greenland Ice Mass graphed repeatedly on this web-page, the negative trend is a long long way from being statistically insignificance. NSIDC thanks Jason Box, Xavier Fettweis, Chris Shuman, and Thomas Mote for data and collaboration. Contrasting temperature trends across the ice-free part of Greenland (25 January 2018), https://www.nature.com/articles/s41598-018-19992-w, "less than 36% of the ice-free Greenland has experienced a significant trend and, if any, a cooling is observed during the last 15 years (<0.15 °C change per year).
This is a false melt signal from seasonal snow and patchy ice areas, where our method of determining surface melting does not work.
Credit: National Snow and Ice Data Center/T. The bottom plot shows air pressure difference from average, relative to 1981 to 2010. What you appear to ignore is the annual +800mm precipitation of snowfall which must be added to the net Ice Mass figures to give the total annual melt. Knowing Heller, there are a no. The figures are based on calculations using DMI's operational ocean and sea ice model HYCOM-CICE. Generally, the surface mass balance is positive. The Danish Meteorological Institute (DMI) presents ice maps. He was director of the Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), a forest and environmental group based in Zurich, and was former director of University of Colorado’s Cooperative Institute for Environmental Sciences (CIRES), which is the parent institute of the National Snow and Ice Data Center (NSIDC). The following animation shows ice mass loss from Greenland as measured by the GRACE gravity satellites: This video published on December 15, 2019 by Dave Borlace of "Just have a think" provides information about a new study finding that Greenland is melting seven times faster than 30 years ago . On Thin Ice:Expedition to a Crumbling Ice Shelf. This graph shows the surface mass balance (SMB) for the Greenland Ice Sheet from autumn 2019 through August 6, 2020 (red line), relative to the 1981 to 2010 average.
[JH] Please provide a link to the report you have referenced.
GRACE measures surface melt and ocean melt. 2017 SIE is at present in 3rd place behind 2012 & 2016. He was 68-years old.  The seasonal snow and ice melt areas for Greenland used here were obtained from several sources, which independently derived melt extent from satellite microwave radiometer data. The 2020 surface runoff to date is lower than in recent years. Percentage of the total area of the Greenland ice sheet experiencing melting on a daily basis. POLAR PORTAL GREENLAND DAILY SURFACE MELT ESTIMATE. As always, the best way to tease out the truth here by following the research of scientists investigating Greenland's ice mass balance. pg 5 graph show rates of reduction in glacier area has reduced since 2012 (which is good news). The second 'this' (27/10/18) declines to be drawn on the 2017/18 total mass balance, deferring to GRACE-FO which was expected to be soon up-&-running in Oct 2018 although at time of writing GRACE-FO output data (rather than data collection) is yet to show itself. "the ice sheet lost 34 gigatonnes (1 Gt is 1 billion tonnes) annually in the period 1992-2001, corresponding to 0.1 mm annual sea level rise.
It also gives an IceSat number of -138 Gt per year for Greenland which is roughly equal to the results of this new research. As the discharge data are not yet available for 2019, it is not possible at this stage to make the full ice loss assessment for 2019. At the very least, there has been an interesting pause in that "acceleration" since 2013.
Do we have GRACE-FO data, yet, so we can extrapolate what has happened in the intervening years? Home | Contact Us He shows the DMI Accumulative Surface Mass Balance graph (the lower one of the above) in two of his November posts (so far).
of ways to cherry-pick data. “[E]ven if it were true that Greenland’s ice had been melting at ‘new record’ rates, after seven and a half years of global cooling global warming cannot be the cause. The ice extent values are calculated from the ice type data from the Ocean and Sea Ice, Satellite Application Facility (), where areas with ice concentration higher than 15% are classified as ice. But why Greenland is highly sensitive to warmer temperatures? The paper specifically proposes a link between the rate of ice-free Greenland LST warming and the Greenland Blocking Index (rather than the "cold blob" suggested by scaddenp @24). Any impact of delayed mechanisms, sea currents maybe? From 2013 to 2017, the average loss per year was 190 gigatonnes per year. While the ice sheet was likely in balance (i.e., ice mass gain was balancing ice mass loss) during the 1970s, 1980s, and early 1990s (Mouginot et al.
It is about 99.93% that annually "does not melt."
It also includes several recent high-mass-loss years for comparison. An isolated area near Helheim Glacier and Kangerlussuaq reached 75 days out of 123 days. Total melt-day extent was 18.6 million square kilometers (7.18 million square miles) for 2020 versus 14.4 million square kilometers (5.60 million square miles) for the 1981 to 2010 average. The lower graph shows daily area in square kilometers of surface melting from June 21 to August 1, 2020, with daily melt extent trends for the preceding four years. Melting through the peak of Greenland’s summer melt season has been well above the 1981 to 2010 average, but below the levels of many previous summers of the past decade. To clarify the situation regardingGoddard/Heller's use of DMI graphics. Enter a term in the search box to find its definition. Greenland Ice Sheet Today is produced at the National Snow and Ice Data Center by Ted Scambos, Julienne Stroeve, and Lora Koenig with support from NASA.
In 2002-2011, the ice sheet lost 215 Gt per year (0.6 mm annual sea level rise).
Molsen - perhaps you could share the link which demonstrates your point?
The faint of heart can take solace that they don't have to look at Tony Heller's website. I dunno, but it's interesting the last six years have gone unnoticed by the MSM, etc. But, they could look at DMI's, NSIDC's, etc. On the other hand, the ice-covered part of Greenland continues to warm and shed ice.
We are working to improve the ice sheet mask.
And the 2013 net ice loss also decelerated relative to the previous year, from 428Gt/yr to 327Gt/yr (although, as the graph of the data shows, the data for these later years is missing a few months). Comments Policy... You need to be logged in to post a comment. So, the end of the second paragraph should have the following added to be accurate and fair: "but the rate of decrease has slowed remarkably since 2012 for reasons that are unknown.
A quick linear regression through the data with the annaul cycle removed (2003-2015, the data which was readily available) gave a trend of -273.4Gt/yr +/-7.3Gt/yr(2sd).
icowrich - try http://gravis.gfz-potsdam.de/greenland. Wind and solar are 30-50% cheaper than thought, admits UK government, 2020 SkS Weekly Climate Change & Global Warming Digest #38, Denial101x - Making Sense of Climate Science Denial. This makes many of the posts above look silly. For et år siden sejlede den tyske isbryder RV Polarstern fra sin hjemhavn Bremerhaven mod det arktiske ocean nord for Sibirien for at lade sig fryse fast i pakisen og agere base for det største flydende havis-eksperiment nogensinde – … In a second post (Nov 9) Goddard/Heller again posts the DMI Acc SMB graph saying "The last two years have seen near record ice gain in Greenland." The season was marked by a series of moderate spikes in melt extent, primarily in the southeast and northwest. Why does land warm up faster than the oceans? ", "The term surface mass balance is used to describe the isolated gain and loss of mass of the surface of the ice sheet – excluding the mass that is lost when glaciers calve off icebergs and melt as they come into contact with warm seawater.". Polar Portal: Monitoring ice and climate in the Arctic And, scaddenp, let's see what happens in the future; as articles on the growing Jacobshavn glacier note, scientists do not understand the processes behind the Greenland ice melt as well as they thought a few years ago. Hope springs eternal but you are going to be disappointed. THE ESCALATOR The GRACE gravity data show that more ice melts each year than falls as snow.
(His screen-shot of the graphic does not past Nov 1.) Read their blog ... Icelights: Answers to your burning questions about ice and climate. The evidence suggested by a multitude of different measurement techniques suggests that not only is Greenland losing ice but that these ice losses are accelerating at a rapid pace (Velicogna 2009). The Cumulative Melt Days image (right) shows the total number of days that melt occurred, year to date. 2016 was jaw-droppingly un-icy through the Autumn, setting new records for low ice.
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