25-km gridded weekly Arctic landfast sea ice distribution from 1976-2026

The landfast ice extent dataset was produced from two sources in this study. The first was obtained from a weekly/biweekly gridded Arctic sea ice product stored as binary files (National Ice Center. National Ice Center Arctic Sea Ice Charts and Climatologies in Gridded Format, Version 1; Fetterer, F., Fowler, C., Eds.; NSIDC, National Snow and Ice Data Center: Boulder, CO, USA, 2006; updated 2009; Available online: https://nsidc.org/data/G02172). This product was released by the U.S. National Ice Center (NIC) and includes data for 1976–2007. The second dataset was obtained by analyzing weekly/biweekly Arctic sea ice charts stored as image files, released by the NIC (US National Ice Center Weekly/Bi-Weekly Ice Analysis Products. Available online: https://www.natice.noaa.gov/products/weekly_products.html) and includes data from 2008. These two datasets were produced by experienced sea ice experts from NIC by integrating and analyzing field observation data, satellite remote sensing data, and numerical simulations. Ice that remained motionless for the duration of the weekly/biweekly ice charts was marked as landfast ice. In this study, the processing technique introduced by Yu et al. was used to process the image-formatted ice charts from the second dataset to obtain the same binary-formatted ice product as the first dataset for 2008–now. A detailed description can be found in a paper by Li et al., 2020 and Wang et a., 2024. ### welcome to use this dataset for scientific study #### ######### data description ######### 1. weekly landfast ice extent dataset from 1976-2026 2. the weekly data was stored in a bin file with binary format. 3. the file "north_x_y_lat_lon.txt" was the grid information. 4. the matlab code file "contour_weekly_extent_code.m" was used to plot weekly bin file. ### please cite this paper when you use it ##### Zixuan Li, Jiechen Zhao*, Su Jie, Li Chuhu, Cheng Bin, Hui Fengming, Yang Qinghua, Shi Lijuan. Spatial and Temporal Variations in the Extent and Thickness of Arctic Landfast Ice. Remote Sensing. 2020, 12(1), 64.Wang, Z., Zhao, J.*, Cheng, B., Hui, F., Su, J., & Cheng, X. (2024). Modeling pan-Arctic seasonal and interannual landfast sea ice thickness and snow depth between 1979 and 2021. Int. J. Digit. Earth, 17. https://doi.org/10.1080/17538947.2024.2376253 ### further information to contact [e-mail] ###########