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Title: Practice and philosophy of climate model tuning across six US modeling centers

Model calibration (or tuning) is a necessary part of developing and testing coupled ocean–atmosphere climate models regardless of their main scientific purpose. There is an increasing recognition that this process needs to become more transparent for both users of climate model output and other developers. Knowing how and why climate models are tuned and which targets are used is essential to avoiding possible misattributions of skillful predictions to data accommodation and vice versa. This paper describes the approach and practice of model tuning for the six major US climate modeling centers. While details differ among groups in terms of scientific missions, tuning targets, and tunable parameters, there is a core commonality of approaches. Furthermore, practices differ significantly on some key aspects, in particular, in the use of initialized forecast analyses as a tool, the explicit use of the historical transient record, and the use of the present-day radiative imbalance vs. the implied balance in the preindustrial era as a target.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [3] ;  [4] ;  [2] ;  [5] ;  [6] ;  [5] ;  [7]
  1. NASA Goddard Inst. for Space Studies (GISS), Broadway, NY (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Princeton Univ. Forrestal Campus, Princeton, NJ (United States)
  4. NASA Goddard Inst. for Space Studies (GISS), Broadway, NY (United States); Columbia Univ., New York, NY (United States)
  5. National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
  6. NASA GSFC, Greenbelt, MD (United States)
  7. NCEP/NWS/NOAA, NCWCP, College Park, MD (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-720926
Journal ID: ISSN 1991-9603
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Geoscientific Model Development (Online)
Additional Journal Information:
Journal Name: Geoscientific Model Development (Online); Journal Volume: 10; Journal Issue: 9; Journal ID: ISSN 1991-9603
Publisher:
European Geosciences Union
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES
OSTI Identifier:
1389939

Schmidt, Gavin A., Bader, David, Donner, Leo J., Elsaesser, Gregory S., Golaz, Jean -Christophe, Hannay, Cecile, Molod, Andrea, Neale, Richard B., and Saha, Suranjana. Practice and philosophy of climate model tuning across six US modeling centers. United States: N. p., Web. doi:10.5194/gmd-10-3207-2017.
Schmidt, Gavin A., Bader, David, Donner, Leo J., Elsaesser, Gregory S., Golaz, Jean -Christophe, Hannay, Cecile, Molod, Andrea, Neale, Richard B., & Saha, Suranjana. Practice and philosophy of climate model tuning across six US modeling centers. United States. doi:10.5194/gmd-10-3207-2017.
Schmidt, Gavin A., Bader, David, Donner, Leo J., Elsaesser, Gregory S., Golaz, Jean -Christophe, Hannay, Cecile, Molod, Andrea, Neale, Richard B., and Saha, Suranjana. 2017. "Practice and philosophy of climate model tuning across six US modeling centers". United States. doi:10.5194/gmd-10-3207-2017. https://www.osti.gov/servlets/purl/1389939.
@article{osti_1389939,
title = {Practice and philosophy of climate model tuning across six US modeling centers},
author = {Schmidt, Gavin A. and Bader, David and Donner, Leo J. and Elsaesser, Gregory S. and Golaz, Jean -Christophe and Hannay, Cecile and Molod, Andrea and Neale, Richard B. and Saha, Suranjana},
abstractNote = {Model calibration (or tuning) is a necessary part of developing and testing coupled ocean–atmosphere climate models regardless of their main scientific purpose. There is an increasing recognition that this process needs to become more transparent for both users of climate model output and other developers. Knowing how and why climate models are tuned and which targets are used is essential to avoiding possible misattributions of skillful predictions to data accommodation and vice versa. This paper describes the approach and practice of model tuning for the six major US climate modeling centers. While details differ among groups in terms of scientific missions, tuning targets, and tunable parameters, there is a core commonality of approaches. Furthermore, practices differ significantly on some key aspects, in particular, in the use of initialized forecast analyses as a tool, the explicit use of the historical transient record, and the use of the present-day radiative imbalance vs. the implied balance in the preindustrial era as a target.},
doi = {10.5194/gmd-10-3207-2017},
journal = {Geoscientific Model Development (Online)},
number = 9,
volume = 10,
place = {United States},
year = {2017},
month = {9}
}