PAMIP Known Issues

  • August 2019: An issue has been discovered in the sea-surface temperature (SST) forcing for experiment 1.3: piSST-pdSIC (tos_input4MIPs_SSTsAndSeaIce_PAMIP_piSST_pdSIC_gn.nc). Experiment 1.3 was originally designed to have exact same present-day sea ice as in 1.1 and 1.4, with preindustrial SST outside of the sea ice zone and present-day SST inside the sea ice zone. However, to be consistent with other PAMIP experiments SST has to be set to preindustrial values where sea ice has been lost from pre-industrial to present-day periods, i.e., the SST for 1.1-1.3 should be identical to 1.5-1.2 in the Northern Hemisphere and identical to 1.7-1.2 in the Southern Hemisphere, and the SST for 1.3-1.2 should be identical to 1.1-1.5 in the Northern Hemisphere and identical to 1.1-1.7 in the Southern Hemisphere. The 1.3 SSTs in the Arctic and Antarctic have been updated to reflect this (compare Figure 1 and 2). These changes may impact the calculation for polar sea ice loss effect (1.1-1.3) and remote SST warming effect (1.3-1.2). We recommend that all modeling groups download the updated 1.3 SST file and rerun this simulation. The new SST forcing file can be downloaded from input4MIPs:
    https://esgf-node.llnl.gov/search/input4mips/?institution_id=UCI&target_mip_list=PAMIP&query=version:20191002

    Figure 1. (Top panel): Annual-mean sea-surface temperature (SST) forcing for 1.1-1.3, 1.5-1.2, and 1.5-1.2 minus 1.1-1.3, 1.1-1.3, 1.7-1.2 and 1.7-1.2 minus 1.1-1.3. (Bottom panel): Annual-mean sea-surface temperature for 1.3-1.2, 1.1-1.5 and 1.1-1.5 minus 1.3-1.2, 1.3-1.2, 1.1-1.7 and 1.1-1.7 minus 1.3-1.2. The plots are based on the original 1.3 SST forcing.

    Figure 2. As in Figure 1, but based on the updated 1.3 SST forcing.

To report any issue, please email Lantao Sun
lantao.sun@colostate.edu ]

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