[MASK]: NHM-SMAP

[masashiniwano]

Overview

• Product name and version: Polar regional climate model NHM-SMAP
• Purpose of your product: Surface mass balance estimates, Understanding detailed snow-atmosphere interactions, etc.
• Geographic region: Greenland, Antarctica, HMA
• Year(s) covered by product: 1980-2023 (The model was forced by JRA-55 for all the regions indicated above); From 2024, the product will be updated by using ERA5.

Upstream

• What upstream mask product did you use?

  • Greenland: Our mask is based on Bamber et al. (2001) and updated by Shimada et al. (2016) on the basis of 2000 to 2014 MODIS satellite images. The mask was introduced and presented by Niwano et al. (2018).
  • Antarctica: Slater et al. (2018)

• Reason for using this mask

  • Greenland: The original data by Bamber et al. (2001) was provided in the form of netcdf, which was easy for me to use.
  • Antarctica: My colleague at the National Institute of Polar Research recommended this dataset and converted the original data to a format that is used in NHM-SMAP.

• If you modified the upstream mask, for example, to define and split ‘main’ vs. ‘peripheral’, how and why?

  • Greenland: In the model, the main ice sheet and peripheral glaciers are defined (in a post-process of the model) by referring to the Zwally basin information because the dataset was popular at that time (around 2018). This point is described by Niwano et al. (2021). Now, another basin information by Mouginot and Rignot (2019) is available. If a grid point with a (non-seasonal) snow/ice flag assigned by the model is outside of the basin area provided by Zwally or Mouginot and Rignot (2019), it is regarded that this grid point is outside of the main ice sheet.
  • Antarctica: Almost the same as Greenland.

• Effort required by you if upstream product changed (to a community standard)

  • Changing its format to what is used in the model is always necessary.

• If you used internal basins, which product and why?

• If you subset to a geographical region (Greenland, Antarctica, sub-region, peripheral, individual glacier), how and why

• Type: vector, raster

• Resolution if raster:

• Projection information:

  • Greenland: Polar Stereo North
  • Antarctica: Polar Stereo South

• Year or years of input product(s):