Sea Ice Extent Ensemble for Uncertainty Quantification

Sea Ice Extent (SIE) is the sum of the grid cell area of all cells with Sea Ice Concentration >= 15%, here based in the OSI SAF Climate Data Record 'OSI-450-a1'. Noise representing errors in SIC is generated with temporal and spatial error correlations similar to https://doi.org/10.5194/tc-18-2473-2024 and refined in https://doi.org/10.5194/tc-20-3783-2026 . The code used for this dataset is available on Github Each ensemble member represents one possible realization of the true SIE, consistent with OSI SAF observations. Ensemble spread indicates the random (non-systematic) uncertainty of the time series. This does not include biasses as we see between different SIE/sea ice concentration products which should be handled separately. Each CSV file contains daily data with the first column giving the date ('YYYY-MM-DD') and 50 ensemble members as indicated by the first row ('batch001iXXX' with XXX zero padded counter from 0 to 49). each cell contains the SIE of that date/ensemble member in km2. Separate files are given for both hemisphere and individual regions, according to the NSIDC sea ice region masks https://doi.org/10.5067/CYW3O8ZUNIWC Naming convention: 'SIE_XH.csv' or 'SIE_XH_reg_regid.csv' where XH is NH for northern hemisphere or SH for southern hemisphere and regid is the region identifier ('Sea_ID') as in the NSIDC mask, repeated here for convenience: NH:Region Sea_IDCentral_Arctic 1.0Beaufort 2.0Chukchi-NA 3.0Chukchi-Asia 3.0E_Siberian 4.0Laptev 5.0Kara 6.0Barents 7.0E_Greenland 8.0Baffin 9.0St_Lawr 10.0Hudson 11.0Can_Arch 12.0Bering-NA 13.0Bering-Asia 13.0Okhotsk 14.0Japan 15.0Bohai 16.0Baltic 17.0Gulf_Alaska 18.0 SH:Region Sea_IDWeddell 1.0Indian 2.0Pacific 3.0RossEast 4.0RossWest 4.0BellAmund 5.0