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) 20250901 0.156 0.2 20250902 0.203 0.4 20250903 1.125 1.5 20250904 1.847 3.3 20250905 -0.333 3.0 20250906 -0.594 2.4 20250907 -0.175 2.2 20250908 1.099 3.3 20250909 2.627 6.0 20250910 1.287 7.2 20250911 1.048 8.3 20250912 0.446 8.7 20250913 0.416 9.2 20250914 -0.190 9.0 20250915 0.543 9.5 20250916 1.759 11.3 20250917 0.443 11.7 20250918 -0.137 11.6 20250919 0.990 12.6 20250920 4.563 17.1 20250921 3.016 20.1 20250922 4.015 24.2 20250923 2.990 27.1 20250924 2.813 30.0 20250925 2.047 32.0 20250926 1.313 33.3 20250927 0.797 34.1 20250928 2.301 36.4 20250929 1.454 37.9 20250930 2.679 40.5 20251001 3.143 43.7 20251002 2.708 46.4 20251003 1.945 48.3 20251004 3.592 51.9 20251005 2.039 54.0 20251006 2.097 56.1 20251007 2.915 59.0 20251008 5.075 64.1 20251009 2.220 66.3 20251010 1.242 67.5 20251011 3.333 70.9 20251012 5.003 75.9 20251013 2.805 78.7 20251007 2.954 59.0 20251006 2.132 56.1 20251007 2.949 59.1 20251008 5.098 64.2 20251009 2.242 66.4 20251010 1.265 67.7 20251011 3.355 71.0 20251012 5.024 76.0 20251013 2.823 78.9 20251014 4.624 83.5 20251015 2.869 86.4 20251016 6.494 92.9 20251017 4.648 97.5 20251018 1.243 98.7 20251019 0.701 99.4 20251020 0.309 99.8 20251021 0.570 100.3 20251022 2.628 102.9 20251023 3.677 106.6 20251024 0.994 107.6 20251025 3.486 111.1 20251026 2.168 113.3 20251027 0.557 113.8 20251028 0.624 114.5 20251029 0.275 114.7 20251030 1.060 115.8 20251031 0.747 116.5 20251101 1.056 117.6 20251102 3.855 121.5 20251103 2.860 124.3 20251104 0.570 124.9 20251105 0.637 125.5 20251106 2.009 127.5 20251107 1.722 129.2 20251108 2.777 132.0 20251109 0.751 132.8 20251110 0.908 133.7 20251111 2.497 136.2 20251112 2.521 138.7 20251113 6.203 144.9 20251114 5.576 150.5 20251115 2.966 153.4 20251116 0.576 154.0 20251117 0.393 154.4 20251118 1.508 155.9 20251119 3.153 159.1 20251120 3.325 162.4 20251121 2.684 165.1 20251122 0.895 166.0 20251123 0.838 166.8 20251124 2.287 169.1 20251125 1.577 170.7 20251126 1.638 172.3 20251127 1.036 173.4 20251128 1.907 175.3 20251129 1.313 176.6 20251130 1.131 177.7 20251201 0.975 178.7 20251202 1.133 179.8 20251203 2.605 182.4 20251204 2.591 185.0 20251205 0.797 185.8 20251206 0.461 186.3 20251207 0.836 187.1 20251208 0.576 187.7 20251209 1.355 189.0 20251210 2.154 191.2 20251211 0.724 191.9 20251212 1.183 193.1 20251213 2.370 195.5 20251214 1.123 196.6 20251215 1.612 198.2 20251216 2.769 201.0 20251217 2.140 203.1 20251218 2.103 205.2 20251219 3.125 208.3 20251220 2.149 210.5 20251221 10.138 220.6 20251222 10.820 231.4 20251223 4.826 236.3 20251224 1.807 238.1 20251225 2.604 240.7 20251226 3.021 243.7 20251227 5.706 249.4 20251228 1.907 251.3 20251229 4.626 255.9 20251230 7.213 263.2 20251231 2.485 265.6 20260101 1.655 267.3 20260102 1.704 269.0 20260103 1.166 270.2 20260104 1.159 271.3 20260105 2.517 273.8 20260106 3.671 277.5 20260107 3.020 280.5 20260108 0.320 280.9 20260109 0.606 281.5 20260110 0.526 282.0 20260111 0.953 282.9 20260112 1.742 284.7 20260113 1.901 286.6 20260114 0.470 287.1 20260115 0.377 287.4 20260116 0.881 288.3 20260117 7.352 295.7 20260118 8.454 304.1 20260119 5.590 309.7 20260120 3.773 313.5 20260121 3.805 317.3 20260122 9.331 326.6 20260123 7.432 334.1 20260124 6.879 340.9 20260125 5.375 346.3 20260126 2.238 348.5 20260127 0.661 349.2 20260128 0.472 349.7 20260129 0.721 350.4 20260130 0.346 350.7 20260131 0.257 351.0 20260201 0.665 351.7 20260202 1.073 352.7