Journal cover Journal topic
The Cryosphere An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/tc-2017-115
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
29 Jun 2017
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal The Cryosphere (TC).
NHM-SMAP: Spatially and temporally high resolution non-hydrostatic atmospheric model coupled with detailed snow process model for Greenland Ice Sheet
Masashi Niwano1, Teruo Aoki2,1, Akihiro Hashimoto1, Sumito Matoba3, Satoru Yamaguchi4, Tomonori Tanikawa1, Koji Fujita5, Akane Tsushima6, Yoshinori Iizuka3, Rigen Shimada7, and Masahiro Hori7 1Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, 305-0052 Japan
2Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530 Japan
3Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819 Japan
4Snow and Ice Research Center, National Research Institute for Earth Science and Disaster Resilience, Nagaoka, 940-0821 Japan
5Graduate School of Environmental Studies, Nagoya University, Nagoya, 464-8601 Japan
6Research Institute for Humanity and Nature, Kyoto, 603-8047 Japan
7Earth Observation Research Center, Japan Aerospace Exploration Agency, Tsukuba, 305-8505 Japan
Abstract. To improve surface mass balance (SMB) estimates for the Greenland Ice Sheet (GrIS), we developed a 5 km resolution regional climate model combining the Japan Meteorological Agency Non-Hydrostatic atmospheric Model and the Snow Metamorphism and Albedo Process model (NHM-SMAP) with an output interval of 1 h, forced by the Japanese 55year Reanalysis (JRA-55). We used in situ data to evaluate NHM-SMAP in the GrIS during the 2011–2014 mass balance years. We investigated two options for the lower boundary conditions of the atmosphere, an "off-line" configuration using snow/firn/ice albedo and surface temperature data from JRA-55 and an "on-line" configuration using values from SMAP. The on-line configuration improved model performance in simulating 2 m air temperature, suggesting that the surface analysis provided by JRA-55 is inadequate for the GrIS and that SMAP results can better simulate snow/firn/ice physical conditions. It also reproduced the measured features of the GrIS climate, diurnal variations, and even a meso-scale strong wind event. In particular, it reproduced the GrIS surface melt area extent well. Sensitivity tests showed that the choice of calculation schemes for vertical water movement in snow and firn has an effect as great as 200 Gt year–1 in the GrIS-wide accumulated SMB estimates; a scheme based on the Richards equation provided the best performance.

Citation: Niwano, M., Aoki, T., Hashimoto, A., Matoba, S., Yamaguchi, S., Tanikawa, T., Fujita, K., Tsushima, A., Iizuka, Y., Shimada, R., and Hori, M.: NHM-SMAP: Spatially and temporally high resolution non-hydrostatic atmospheric model coupled with detailed snow process model for Greenland Ice Sheet, The Cryosphere Discuss., https://doi.org/10.5194/tc-2017-115, in review, 2017.
Masashi Niwano et al.
Masashi Niwano et al.
Masashi Niwano et al.

Viewed

Total article views: 513 (including HTML, PDF, and XML)

HTML PDF XML Total Supplement BibTeX EndNote
422 84 7 513 23 2 7

Views and downloads (calculated since 29 Jun 2017)

Cumulative views and downloads (calculated since 29 Jun 2017)

Viewed (geographical distribution)

Total article views: 513 (including HTML, PDF, and XML)

Thereof 507 with geography defined and 6 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 22 Nov 2017
Publications Copernicus
Download
Short summary
We present a high resolution regional climate model called NHM-SMAP applied in the Greenland Ice Sheet (GrIS). The model forced by JRA-55 Reanalysis is evaluated by using in situ data from automated weather stations, stake measurements, and ice core obtained from 2011 to 2014. By utilizing the model, we highlight the choice of calculation schemes for vertical water movement in snow and firn has an effect as great as 200 Gt year–1 in the yearly-accumulated GrIS-wide surface mass balance estimates.
We present a high resolution regional climate model called NHM-SMAP applied in the Greenland Ice...
Share