Articles | Volume 8, issue 9
Geosci. Model Dev., 8, 2841–2856, 2015
Geosci. Model Dev., 8, 2841–2856, 2015

Model experiment description paper 09 Sep 2015

Model experiment description paper | 09 Sep 2015

The GRENE-TEA model intercomparison project (GTMIP): overview and experiment protocol for Stage 1

S. Miyazaki2,1,a, K. Saito2, J. Mori2,1, T. Yamazaki3, T. Ise4, H. Arakida5, T. Hajima2, Y. Iijima1, H. Machiya2,1, T. Sueyoshi2,1, H. Yabuki2,1, E. J. Burke6, M. Hosaka7, K. Ichii2, H. Ikawa8, A. Ito9, A. Kotani12, Y. Matsuura10, M. Niwano7, T. Nitta11, R. O'ishi11,1, T. Ohta12, H. Park2, T. Sasai13, A. Sato14, H. Sato2, A. Sugimoto15, R. Suzuki2, K. Tanaka2, S. Yamaguchi14, and K. Yoshimura11 S. Miyazaki et al.
  • 1National Institute of Polar Research, Tachikawa, Japan
  • 2Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
  • 3Graduate School of Science, Tohoku University, Sendai, Japan
  • 4Field Science Education and Research Center, Kyoto University, Kyoto, Japan
  • 5Advanced Institute for Computational Science, RIKEN, Kobe, Japan
  • 6Met Office Hadley Centre, Exeter, UK
  • 7Meteorological Research Institute, Tsukuba, Japan
  • 8National Institute for Agro-Environmental Sciences, Tsukuba, Japan
  • 9National Institute for Environmental Studies, Tsukuba, Japan
  • 10Forestry and Forest products Research Institute, Tsukuba, Japan
  • 11Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan
  • 12Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
  • 13Faculty of Life and Environmental Science, University of Tsukuba, Tsukuba, Japan
  • 14Snow and Ice Research Center, National Research Institute for Earth Science and Disaster Prevention, Nagaoka, Japan
  • 15Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Japan
  • anow at: Sonic Corporation, Tachikawa, Japan

Abstract. As part of the terrestrial branch of the Japan-funded Arctic Climate Change Research Project (GRENE-TEA), which aims to clarify the role and function of the terrestrial Arctic in the climate system and assess the influence of its changes on a global scale, this model intercomparison project (GTMIP) is designed to (1) enhance communication and understanding between the modelling and field scientists and (2) assess the uncertainty and variations stemming from variability in model implementation/design and in model outputs using climatic and historical conditions in the Arctic terrestrial regions. This paper provides an overview of all GTMIP activity, and the experiment protocol of Stage 1, which is site simulations driven by statistically fitted data created using the GRENE-TEA site observations for the last 3 decades. The target metrics for the model evaluation cover key processes in both physics and biogeochemistry, including energy budgets, snow, permafrost, phenology, and carbon budgets. Exemplary results for distributions of four metrics (annual mean latent heat flux, annual maximum snow depth, gross primary production, and net ecosystem production) and for seasonal transitions are provided to give an outlook of the planned analysis that will delineate the inter-dependence among the key processes and provide clues for improving model performance.

Short summary
The paper provides an overall outlook and the Stage 1 experiment (site simulations) protocol of GTMIP, an open model intercomparison project for terrestrial Arctic, conducted as an activity of the Japan-funded Arctic Climate Change Research Project (GRENE-TEA). Models are driven by 34-year data created with the GRENE-TEA observations at four sites in Finland, Siberia and Alaska, and evaluated for physico-ecological key processes: energy budgets, snow, permafrost, phenology, and carbon budget.