Anthropogenic land cover changes (ALCC) affect climate through both biogeophysical and biogeochemical effects. Biogeophysical effects of ALCC during the period 1870-1992 on regional and global scales have been recently explored by Pitman et al. (2009) using seven climate models. Biogeochemical effects of historical ALCC in terms of landuse emissions have been intensively addressed as well (see, e.g., Pongratz et al., 2009; Shevliakova et al., 2009). Effects of future land cover changes on climate are still largely unexplored.
This document describes an experimental protocol for intercomparison of landuse effects on climate for models participating in the CMIP5 simulations. The CMIP5 experiments already include simulations driven by fossil fuel emissions and landuse change scenarios, however, additional simulations without landuse changes are required for separation of effects of landuse on climate. These additional simulations will be analyzed within the LUCID project.
A reminder from the summary of the CMIP5 Experiment Design:
Landuse scenarios for the CMIP5 simulations are available at http://luh.unh.edu/, see Hurrt et al. (2009).
Detailed experimental protocol could be found here.
Table 1. Details of experimental protocol of LUCID-CMIP5 simulations
LUCID-CMIP5 simulations | CMIP5 reference*/ initial condition runs | RCP scenario (W/m2) | Atmospheric CO2 concentration | Landuse, wood harvest | Duration, Years AD |
---|---|---|---|---|---|
Option L1 (biogeophysical and biogeochemical effects) | |||||
L1A85 (core)** | 5.3 / 5.2 | 8.5 | Prescribed (output of the CMIP5 5.3 run) | Fixed to yr 2005 | 2006-2100 |
L1B85 (core) | 5.3 / 5.2 | 8.5 | Interactive (emission-driven) | Fixed to yr 2005 | 2006-2100 |
L1A26 (optional) | (L1C26) / 5.2 | 2.6 | Prescribed (output of the L1C26 run) | Fixed to yr 2005 | 2006-2100 |
L1B26 | Emission-driven 4.2 / 5.2 | 2.6 | Interactive (emission-driven) | Fixed to yr 2005 | 2006-2100 |
L1C26*** (optional) | Emission-driven 4.2 / 5.2 | 2.6 | Interactive (emission-driven) | RCP2.6 | 2006-2100 |
Option L2 (biogeophysical effects and landuse emissions) | |||||
L2A85 (core) | 4.2 / 3.2 | 8.5 | Prescribed (RCP8.5) | Fixed to yr 2005 | 2006-2100 |
L2A26 (optional) | 4.3 / 3.2 | 2.6 | Prescribed (RCP2.6) | Fixed to yr 2005 | 2006-2010 |
* The CMIP5 simulation that determines all details of the experimental setup except of landuse
** Core experiments are compulsory; tier ones are voluntarily
***This emission-driven RCP2.6 simulation is not included into the list of standard runs of CMIP5. However, many CMIP5 groups are going to perform this simulation anyway because of high political relevance
The output of the LUCID-CMIP5 simulations should be prepared in accordance with the CMIP5 protocol, see http://cmip-pcmdi.llnl.gov/cmip5/
An output of the LUCID-CMIP5 simulation should be submitted and stored in accordance with the CMIP5 data submission rules, see http://cmip-pcmdi.llnl.gov/cmip5/
For LUCID CMOR tables, see http://www2‐pcmdi.llnl.gov/cmor/tables/
To register for the LUCID-CMIP5 intercomparison, send an e-mail with
the model name and reference,
Extended: 18 November 2011