Polar Portal ########################################################## Daily and accumulated surface mass budget and melt area is calculated using output from the DMI HARMONIE-AROME IGB model. This model is run daily for weather prediction purposes and the SMB model output is provided here purely for information purposes. While we do strive to provide data in near real-time, DMI takes no responsibility for any errors, gaps or other data deficiencies or any losses suffered as a result of these. The surface mass balance model is described in Langen et al., 2017 Liquid Water Flow and Retention on the Greenland Ice Sheet in the Regional Climate Model HIRHAM5: Local and Large-Scale Impacts , Frontiers in Earth Science, 4  (https://www.frontiersin.org/article/10.3389/feart.2016.00110). PLEASE NOTE: Surface mass balance is a model product augmented with observations. In an initial set-up ("assimilation") step, the HARMONIE-AROME model makes a short term forecast which is compared to meteorological observations and, if necessary, slightly corrected. This observation-enhanced model field is then used as a basis to run the dedicated surface mass balance model. This implies that the real-time calculated surface mass balance depends on the underlying operational weather model. Operational models are routinely updated, and even though the results based on the different models resemble each other, they are not identical. As a consequence, time series of the calculated surface mass balances or the comparison of results from different years should be treated with some caution. Note that the long-term climatology used in the polarportal plots (the average period from 1981-2010) are based on similar output from a different climate model, HIRHAM5 also run at DMI using the ERA-Interim reanalysis (Mottram et al., 2017 Surface mass balance of the Greenland ice sheet in the regional climate model HIRHAM5: Present state and future prospects, Journal of Low Temperature Science, 75, 105-115: https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/65106/1/12_105-115.pdf). However, the same SMB model is used to calculate melt and SMB for the background period so that the variables are comparable. Data from this constant version is also freely available to download (see: http://www.prudence.dmi.dk/data/temp/RUM/HIRHAM/Greenland/ERAI). Please acknowledge DMI/Polar Portal if you use this data in published works. We recommend that you contact us before working with the data to avoid possible misinterpretation. Many more variables are available and we can supply further data for scientific purposes. Please contact info@polarportal.dk. ########################################################## Date SMB(Gt/day) SMBacc(Gt) 20260901 0.732 0.7 20260902 0.617 1.3 20260903 1.404 2.8 20260904 1.283 4.0 20260905 5.628 9.7 20260906 7.482 17.1 20260907 5.594 22.7 20260908 4.275 27.0 20260909 2.516 29.5 20260910 4.369 33.9 20260911 1.482 35.4 20260912 0.543 35.9 20260913 0.994 36.9 20260914 0.561 37.5 20260915 4.286 41.8 20260916 4.197 46.0 20260917 3.126 49.1 20260918 1.330 50.4 20260919 1.343 51.8 20260920 1.846 53.6 20260921 1.881 55.5 20260922 0.998 56.5 20260923 0.514 57.0 20260924 0.445 57.4 20260925 0.325 57.8 20260926 0.523 58.3 20260927 0.921 59.2 20260928 0.422 59.6 20260929 0.819 60.5 20260930 1.506 62.0 20261001 5.114 67.1 20261002 2.692 69.8 20261003 1.650 71.4 20261004 1.030 72.4 20261005 1.623 74.1 20261006 1.669 75.7 20261007 1.894 77.6 20261008 1.274 78.9 20261009 0.703 79.6 20261010 2.624 82.2 20261011 3.154 85.4 20261012 6.490 91.9 20261013 2.501 94.4 20261014 0.773 95.2 20261015 0.269 95.4 20261016 3.784 99.2 20261017 13.582 112.8 20261018 6.807 119.6 20261019 2.230 121.8 20261020 2.645 124.5 20261021 1.830 126.3 20261022 1.146 127.4 20261023 1.787 129.2 20261024 2.537 131.8 20261025 2.810 134.6 20261026 1.377 136.0 20261027 2.376 138.3 20261028 4.092 142.4 20261029 9.948 152.4 20261030 5.978 158.4 20261031 3.526 161.9