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) 20240901 6.098 6.1 20240902 0.936 7.0 20240903 1.766 8.8 20240904 1.479 10.3 20240905 0.695 11.0 20240906 3.587 14.6 20240907 2.747 17.3 20240908 0.903 18.2 20240909 0.443 18.7 20240910 0.215 18.9 20240911 0.163 19.0 20240912 -0.155 18.9 20240913 -0.073 18.8 20240914 -0.220 18.6 20240915 -0.007 18.6 20240916 0.323 18.9 20240917 0.623 19.5 20240918 1.670 21.2 20240919 2.281 23.5 20240920 0.221 23.7 20240921 2.777 26.5 20240922 6.026 32.5 20240923 3.960 36.5 20240924 0.877 37.3 20240925 0.886 38.2 20240926 0.983 39.2 20240927 3.161 42.4 20240928 5.500 47.9 20240929 6.184 54.0 20240930 7.178 61.2 20241001 1.805 63.0 20241002 0.897 63.9 20241003 4.410 68.3 20241004 2.512 70.9 20241005 0.537 71.4 20241006 0.459 71.8 20241007 2.252 74.1 20241008 2.242 76.3 20241009 1.613 78.0 20241010 0.654 78.6 20241011 1.076 79.7 20241012 0.484 80.2 20241013 0.351 80.5 20241014 0.169 80.7 20241015 0.299 81.0 20241016 0.163 81.2 20241017 0.139 81.3 20241018 0.489 81.8 20241019 1.313 83.1 20241020 1.227 84.3 20241021 0.932 85.3 20241022 0.803 86.1 20241023 0.521 86.6 20241024 4.355 90.9 20241025 4.565 95.5 20241026 1.396 96.9 20241027 1.191 98.1 20241028 1.125 99.2 20241029 0.766 100.0 20241030 1.269 101.2 20241031 1.644 102.9 20241101 4.036 106.9 20241102 3.598 110.5 20241103 5.175 115.7 20241104 5.203 120.9 20241105 4.865 125.8 20241106 5.973 131.7 20241107 1.464 133.2 20241108 1.815 135.0 20241109 5.634 140.6 20241110 4.008 144.7 20241111 5.985 150.6 20241112 4.390 155.0 20241113 4.502 159.5 20241114 3.678 163.2 20241115 2.059 165.3 20241116 0.921 166.2 20241117 0.533 166.7 20241118 0.557 167.3 20241119 0.345 167.6 20241120 1.094 168.7 20241121 2.205 170.9 20241122 2.008 172.9 20241123 2.875 175.8 20241124 3.077 178.9 20241125 4.231 183.1 20241126 1.858 185.0 20241127 0.814 185.8 20241128 1.749 187.5 20241129 0.895 188.4 20241130 0.380 188.8 20241201 1.119 189.9 20241202 2.775 192.7 20241203 1.081 193.8 20241204 1.071 194.9 20241205 0.392 195.3 20241206 0.265 195.5 20241207 3.709 199.2 20241208 3.292 202.5 20241209 3.101 205.6 20241210 1.139 206.8 20241211 1.956 208.7 20241212 1.862 210.6 20241213 5.936 216.5 20241214 3.298 219.8 20241215 0.969 220.8 20241216 0.524 221.3 20241217 1.077 222.4 20241218 2.488 224.9 20241219 2.800 227.7 20241220 0.545 228.2 20241221 1.069 229.3 20241222 2.023 231.3 20241223 2.442 233.7 20241224 2.702 236.4 20241225 4.224 240.7 20241226 2.704 243.4 20241227 0.791 244.2 20241228 0.764 244.9 20241229 1.004 245.9 20241230 0.827 246.8 20241231 1.287 248.0 20250101 0.418 248.5 20250102 3.334 251.8 20250103 3.237 255.0 20250104 1.327 256.4 20250105 0.995 257.4 20250106 1.394 258.8 20250107 2.083 260.8 20250108 2.603 263.4 20250109 0.815 264.3 20250110 0.141 264.4 20250111 0.441 264.8 20250112 4.469 269.3 20250113 2.062 271.4 20250114 1.918 273.3 20250115 0.347 273.6 20250116 0.536 274.2 20250117 0.390 274.6 20250118 0.298 274.9 20250119 0.594 275.5 20250120 2.230 277.7 20250121 5.633 283.3 20250122 7.013 290.3 20250123 3.746 294.1 20250124 5.133 299.2 20250125 3.779 303.0 20250126 1.382 304.4 20250127 0.863 305.2 20250128 0.971 306.2 20250129 3.491 309.7 20250130 5.406 315.1 20250131 5.952 321.0 20250201 9.386 330.4 20250202 3.242 333.7 20250203 2.680 336.4 20250204 7.195 343.6 20250205 2.637 346.2 20250206 1.624 347.8 20250207 0.773 348.6 20250208 1.255 349.8 20250209 5.182 355.0 20250210 1.261 356.3 20250211 4.827 361.1 20250212 9.563 370.7 20250213 7.001 377.7 20250214 1.650 379.3 20250215 2.115 381.4 20250216 3.506 384.9 20250217 0.968 385.9 20250218 0.458 386.4 20250219 1.935 388.3 20250220 2.018 390.3 20250221 0.812 391.1 20250222 0.943 392.1 20250223 0.428 392.5 20250224 0.992 393.5 20250225 2.450 395.9 20250226 2.675 398.6 20250227 3.293 401.9 20250228 6.752 408.7 20250301 3.926 412.6 20250302 4.828 417.4 20250303 1.792 419.2 20250304 2.385 421.6 20250305 1.963 423.6 20250306 1.246 424.8 20250307 0.213 425.0 20250308 2.838 427.9 20250309 4.941 432.8 20250310 4.174 437.0 20250311 5.175 442.1 20250312 2.384 444.5 20250313 3.659 448.2 20250314 4.834 453.0 20250315 4.719 457.7 20250316 8.049 465.8 20250317 2.235 468.0 20250318 1.415 469.4 20250319 3.504 472.9 20250320 4.276 477.2 20250321 1.933 479.2 20250322 1.950 481.1 20250323 1.227 482.3 20250324 2.370 484.7 20250325 0.917 485.6