Bare ice mask maps and albedo obtained from MAR and MODIS at 6 km for the summers 2000 - 2021 and selected MAR variables for SMB analysis

Data are available at: arcticdata.io/data/10.18739/A2TB0XX0B This dataset shows the daily bare ice extent obtained from the combination of MODIS satellite data and MAR regional climate model outputs fore the period 2000 - 2021, albedo recorded from MODIS reprojected on the MAR regional climate model grid and the surface outputs used for SMB of the MAR model over the whole Greenland ice sheet for the same period at the same spatial resolution. It shows, in summary, areas over the Greenland ice sheet where both tools (satellite and model) suggest bare ice might be present. Specifically: 1) bare_ice_albedo_modiis_on_MAR_6km.zip contains two Matlab files. the first file (AL2_6km.mat) contains daily albedo values from MODIS over the bare ice regions. the variable has 4 dimensions , with the first two being the x and y position , the 3rd variable being the year and the 4th dimension being the day of the period June 1 - Augst 31 (92 days). The second variable sboth_6km.mat show the binary map of where bare ice albedo is located according to the combination of MODIS and MAR outputs (e.g., only pixels where both datasets suggest the presence of bare ice are used here). 2) MOD10A1_albedo_MARproj_6_5km.zip contains the same data as AL2_6km.mat but as GeoTiffs for user's convenience. 3) MARv3_12_1_6km_daily_ERA5_XXXX.nc contains the MAR outputs used for the SMB analysis as NetCDF files. The datasets contain the following variables: albedo, liqui water content, latent heat flux, sensible heat flux, long wave radiation (net), shortwave radiation (net), SMB, snowfall, rainfall, runoff, surface pressure, surface temperature. These datasets have been used, for example, in Antwerpen, R. M., Tedesco, M., Fettweis, X., Alexander, P., and van de Berg, W. J.: Assessing bare-ice albedo simulated by MAR over the Greenland ice sheet (2000–2021) and implications for meltwater production estimates, The Cryosphere, 16, 4185–4199, https://doi.org/10.5194/tc-16-4185-2022, 2022.本数据集可从以下地址获取：arcticdata.io/data/10.18739/A2TB0XX0B。本数据集涵盖2000年至2021年期间，结合中分辨率成像光谱仪（MODIS）卫星数据与区域气候模型（MAR）输出结果得到的每日裸冰范围，以及经MAR区域气候模型网格重投影的MODIS反照率数据，同时包含同期同空间分辨率下、用于格陵兰冰盖全域MAR模型表面质量平衡（SMB）分析的地表输出变量。简言之，本数据集展示了格陵兰冰盖上经卫星与模型双重验证可能存在裸冰的区域。具体而言：1）bare_ice_albedo_modis_on_MAR_6km.zip 包含两个Matlab文件。第一个文件AL2_6km.mat存储了裸冰区域的MODIS每日反照率数据，该变量包含4个维度：前两维为x、y坐标位置，第三维为年份，第四维为6月1日至8月31日期间的日序（共计92天）。第二个文件sboth_6km.mat则展示了结合MODIS与MAR输出结果判定的裸冰反照率分布二值图（即仅选取两类数据集均指示存在裸冰的像素）。2）MOD10A1_albedo_MARproj_6_5km.zip 提供了与AL2_6km.mat完全一致的数据，但存储为GeoTIFF格式，以方便用户使用。3）MARv3_12_1_6km_daily_ERA5_XXXX.nc 为存储MAR模型输出结果的NetCDF文件，用于SMB分析。该数据集包含以下变量：反照率、液态水含量、潜热通量、感热通量、净长波辐射、净短波辐射、表面质量平衡（SMB）、降雪量、降雨量、径流量、地表气压以及地表温度。上述数据集已被应用于如下研究：Antwerpen R.M.、Tedesco M.、Fettweis X.、Alexander P.与van de Berg W.J.于2022年发表于《The Cryosphere》第16卷的论文《Assessing bare-ice albedo simulated by MAR over the Greenland ice sheet (2000–2021) and implications for meltwater production estimates》，该文DOI为10.5194/tc-16-4185-2022，刊载于第4185–4199页。