@ARTICLE\{IMM2013-06691,
    author       = "P. L. Svendsen and O. B. Andersen and A. A. Nielsen",
    title        = "Acceleration of the Greenland ice sheet mass loss as observed by {GRACE}: Confidence and sensitivity",
    year         = "2013",
    keywords     = "Greenland, mass loss, acceleration, confidence intervals, {GRACE}",
    pages        = "24-29",
    journal      = "Earth and Planetary Science Letters",
    volume       = "364",
    editor       = "",
    number       = "",
    publisher    = "Elsevier",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/6691-full.html",
    abstract     = "We examine the scale and spatial distribution of the mass change acceleration in Greenland and its statistical significance, using processed gravimetric data from the {GRACE} mission for the period 2002–2011. Three different data products – the {CNES}/{GRGS,} {DMT-}1 band {GGFC} {GRACE} solutions – have been used, all revealing an accelerating mass loss in Greenland, though with significant local differences between the three datasets. Compensating for leakage effects, we obtain acceleration values of 18.6 Gt/yr2 for {CNES}/{GRGS,} 8.8 Gt/yr2 for {DMT-}1b,and 14.8 Gt/yr2 for {GGFC}.
We find considerable mass loss acceleration in the Canadian Arctic Archipelago, some of which will leak into the values for Greenland, depending on the approach used, and for our computations the leakage has been estimated at up to 4.7 Gt/yr2.
The length of the time series of the {GRACE} data makes a huge difference in establishing an acceleration of the data. For both 10-day and monthly {GRACE} solutions, an observed acceleration on the order of 10–20 Gt/yr2 is shown to require more than 5 yrs of data to establish with statistical significance.
In order to provide an independent evaluation, ICESat laser altimetry data have been smoothed to match the resolution of the {GRACE} solutions. This gives us an estimated upper bound for the acceleration of about 29.7 Gt/yr2 for the period 2003–2009, consistent with the acceleration values and corresponding confidence intervals found with {GRACE} data.",
    isbn_issn    = "DOI:10.1016/j.epsl.2012.12.010"
}