SICEv2.3.2 Svalbard snow and ice broadband albedo and surface optical properties from Sentinel-3’s OLCI at 1000 m resolution, 2017-2023

Timespan 1 April, to 31 September for each year 2017 to 2023 and is being updated starting ~April each year Description For multiple Arctic glaciated regions (Table 1), 1km daily data (Table 2) from the SICE v1.6 algorithm, see Wehrlé et al (2021) and Kokhanovsky et al (2019) for details. Broadband albedo \"albedo_bb_planar_sw\" is after Kokhanovsky et al (2019). \"BBA_combination\" is albedo_bb_planar_sw for albedo_bb_planar_sw values above 0.565 and is combined with an ampirical albedo for albedo_bb_planar_sw below or equal to 0.565, see Wehrlé et al (2021). Data format is GeoTiff in the EPSG:3413 - WGS 84 / NSIDC Sea Ice Polar Stereographic North. We suggest using rasterio to read the data files. The data are also available from https://thredds.geus.dk/ Data Format Data format is GeoTiff in the EPSG:3413 - WGS 84 / NSIDC Sea Ice Polar Stereographic North projection. We suggest using rasterio to read the data files.   Table 1, SICE regions, sorted by decreasing area region  area, sq km  area, sq km  Greenland  1,744,666  82.7  Arctic Canada North  100,691  4.8  Alaska and Yukon  96,909  4.6  Arctic Canada South  40,970  1.9  Norway  34,018  1.6  Svalbard  32,506  1.5  Novaya Zemlya  21,506  1.0  Severnaya Zemlya  15,842  0.8  Frans Josef Land  12,131  0.6  Iceland  11,489  0.5    Table 2, SICE v1 data name  description  BBA_combination  broadband albedo based on albedo_bb_planar_sw for albedo_bb_planar_sw above 0.565 and based on empirical algorithm for albedo_bb_planar_sw less than 0.565  SCDA_final  cloud mask  albedo_bb_planar_sw    diagnostic_retrieval  per pixel diagnostic info  num_scenes  number of scenes  r_TOA_01  TOA reflectance, band 1  r_TOA_06  TOA reflectance, band 6  r_TOA_17  TOA reflectance, band 17  r_TOA_21  TOA reflectance, band 21  snow_specific_surface_area  SSA  Reference Publications Kokhanovsky A., Lamare M., Danne O., Brockmann C., Dumont M., Picard G., Arnaud L., Favier V., Jourdain B., Le Meur E., Di Mauro B., Aoki T., Niwano M., Rozanov V., Korkin S., Kipfstuhl S., Freitag J., Hoerhold M., Zuhr A., Vladimirova D., Faber A-K., Steen-Larsen HC., Wahl S., Andersen JK., Vandecrux B., van As D., Mankoff KD., Kern M., Zege E., Box JE. 2019. Retrieval of Snow Properties from the Sentinel-3 Ocean and Land Colour Instrument. Remote Sensing 11:2280. https://doi.org/10.3390/rs11192280 Wehrlé A., Box JE., Niwano M., Anesio AM., Fausto RS. 2021. Greenland bare-ice albedo from PROMICE automatic weather station measurements and Sentinel-3 satellite observations. GEUS Bulletin 47. https://doi.org/10.34194/geusb.v47.5284 Related Publications Kokhanovsky A., Lamare M., Di Mauro B., Picard G., Arnaud L., Dumont M., Tuzet F., Brockmann C., Box JE. 2018. On the reflectance spectroscopy of snow. The Cryosphere 12:2371–2382. https://doi.org/10.5194/tc-12-2371-2018 Related Information https://snow.geus.dk/ Questions? contact Jason Box, [e-mail]

时间范围：2017至2023年每年的4月1日至9月31日，且每年约4月起开始更新。
数据集说明：针对多个北极冰川区域（表1），采用SICE v1.6算法生成的1km分辨率逐日数据（表2），详细算法参见Wehrlé等（2021）与Kokhanovsky等（2019）的研究成果。其中宽带反照率`albedo_bb_planar_sw`源自Kokhanovsky等（2019）的方法；`BBA_combination`字段指当`albedo_bb_planar_sw`数值大于0.565时直接采用该值，当`albedo_bb_planar_sw`小于等于0.565时则结合经验反照率算法组合得到，具体实现细节参见Wehrlé等（2021）。
数据格式：采用EPSG:3413坐标系（WGS 84 / NSIDC海冰北极立体投影北）下的GeoTIFF格式，建议使用rasterio库读取数据文件。该数据集亦可通过https://thredds.geus.dk/ 获取。

表1 SICE区域（按面积降序排列）
| 区域名称 | 面积（平方千米） | 占比（%） |
|-------------------------|------------------|----------|
| 格陵兰岛 | 1744666 | 82.7 |
| 北极加拿大北部区域 | 100691 | 4.8 |
| 阿拉斯加与育空地区 | 96909 | 4.6 |
| 北极加拿大南部区域 | 40970 | 1.9 |
| 挪威 | 34018 | 1.6 |
| 斯瓦尔巴群岛 | 32506 | 1.5 |
| 新地岛 | 21506 | 1.0 |
| 北地群岛 | 15842 | 0.8 |
| 法兰士约瑟夫地群岛 | 12131 | 0.6 |
| 冰岛 | 11489 | 0.5 |

表2 SICE v1数据集字段说明
| 字段名 | 说明 |
|---------------------------------|----------------------------------------------------------------------|
| BBA_combination | 宽带反照率：当`albedo_bb_planar_sw`大于0.565时直接采用该值，小于等于0.565时结合经验算法生成 |
| SCDA_final | 云掩码 |
| albedo_bb_planar_sw | 诊断反演结果 |
| diagnostic_retrieval | 逐像元诊断信息 |
| num_scenes | 有效场景总数 |
| r_TOA_01 | 第1波段顶大气层反射率 |
| r_TOA_06 | 第6波段顶大气层反射率 |
| r_TOA_17 | 第17波段顶大气层反射率 |
| r_TOA_21 | 第21波段顶大气层反射率 |
| snow_specific_surface_area | 雪比表面积（SSA） |

引用文献
1. Kokhanovsky A., Lamare M., Danne O., Brockmann C., Dumont M., Picard G., Arnaud L., Favier V., Jourdain B., Le Meur E., Di Mauro B., Aoki T., Niwano M., Rozanov V., Korkin S., Kipfstuhl S., Freitag J., Hoerhold M., Zuhr A., Vladimirova D., Faber A-K., Steen-Larsen HC., Wahl S., Andersen JK., Vandecrux B., van As D., Mankoff KD., Kern M., Zege E., Box JE. 2019. 基于Sentinel-3海洋与陆地彩色仪的雪层属性反演. Remote Sensing, 11:2280. https://doi.org/10.3390/rs11192280
2. Wehrlé A., Box JE., Niwano M., Anesio AM., Fausto RS. 2021. 基于PROMICE自动气象站观测与Sentinel-3卫星数据的格陵兰裸冰反照率反演. GEUS Bulletin, 47. https://doi.org/10.34194/geusb.v47.5284

相关文献
Kokhanovsky A., Lamare M., Di Mauro B., Picard G., Arnaud L., Dumont M., Tuzet F., Brockmann C., Box JE. 2018. 雪层反射光谱研究. The Cryosphere, 12:2371–2382. https://doi.org/10.5194/tc-12-2371-2018

相关信息获取渠道：https://snow.geus.dk/
咨询联系方式：如有疑问，请联系Jason Box，邮箱：[e-mail]