Description of the monthly sea ice production data set in the Southern Ocean. The sea ice production analysis is calculated daily on the polar stereographic grid with a spatial resolution of 6.25 km. The analysis uses AMSR-E microwave data, and ERA5 data with a spatial resolution of 0.25 deg. x 0.25 deg.. The mapping of sea ice production is described in Nakata K., K. I. Ohshima, and S. Nihashi, 2021: Mapping of active frazil for Antarctic coastal polynyas, with an estimation of sea-ice production. Geophyisical Research Letters, 48, e2020GL091353, doi:10. 1029/2020GL091353 In the estimation of ice production, we used the thin ice thickness algorithm with discrimination of ice type (active-frazil and thin solid ice), developed by the following paper. Nakata, K., K. I. Ohshima, S. Nihashi, 2019: Estimation of thin ice thickness and discrimination of ice type from AMSR-E passive microwave data. IEEE Transactions on Geoscience and Remote Sensing, 57(1), 263-276, doi:10.1109/TGRS.2018.2853590. When you will use these data set in your paper, please be sure to refer Nakata et al. (2021) and Nakata et al. (2019). In this web site, the sea ice production analysis is available in individual yearly files of individual monthly data products. The latitude/longitude and pixel-area grid data can be downloaded from the website of the National Snow and Ice Data Center (NSIDC) ( https://nsidc.org/data/polar-stereo/tools_geo_pixel.html). Kazuki Nakata --------------- E-mail: knakata0924@gmail.com Kay I. Ohshima --------------- E-mail: ohshima@lowtem.hokudai.ac.jp Phone: +81-11-706-5481 FAX: +81-11-706-7362 Postal Address: Institute of Low Temperature Science, Hokkaido University, Kita-19, Nishi-8, Kita-ku, Sapporo 060-0819, Japan UPDATED: 11 July 2023