Author:
Schmidt Gavin A.,Andrews Timothy,Bauer Susanne E.,Durack Paul J.,Loeb Norman G.,Ramaswamy V.,Arnold Nathan P.,Bosilovich Michael G.,Cole Jason,Horowitz Larry W.,Johnson Gregory C.,Lyman John M.,Medeiros Brian,Michibata Takuro,Olonscheck Dirk,Paynter David,Raghuraman Shiv Priyam,Schulz Michael,Takasuka Daisuke,Tallapragada Vijay,Taylor Patrick C.,Ziehn Tilo
Abstract
The Clouds and the Earth's Radiant Energy System (CERES) project has now produced over two decades of observed data on the Earth's Energy Imbalance (EEI) and has revealed substantive trends in both the reflected shortwave and outgoing longwave top-of-atmosphere radiation components. Available climate model simulations suggest that these trends are incompatible with purely internal variability, but that the full magnitude and breakdown of the trends are outside of the model ranges. Unfortunately, the Coupled Model Intercomparison Project (Phase 6) (CMIP6) protocol only uses observed forcings to 2014 (and Shared Socioeconomic Pathways (SSP) projections thereafter), and furthermore, many of the ‘observed' drivers have been updated substantially since the CMIP6 inputs were defined. Most notably, the sea surface temperature (SST) estimates have been revised and now show up to 50% greater trends since 1979, particularly in the southern hemisphere. Additionally, estimates of short-lived aerosol and gas-phase emissions have been substantially updated. These revisions will likely have material impacts on the model-simulated EEI. We therefore propose a new, relatively low-cost, model intercomparison, CERESMIP, that would target the CERES period (2000-present), with updated forcings to at least the end of 2021. The focus will be on atmosphere-only simulations, using updated SST, forcings and emissions from 1990 to 2021. The key metrics of interest will be the EEI and atmospheric feedbacks, and so the analysis will benefit from output from satellite cloud observation simulators. The Tier 1 request would consist only of an ensemble of AMIP-style simulations, while the Tier 2 request would encompass uncertainties in the applied forcing, atmospheric composition, single and all-but-one forcing responses. We present some preliminary results and invite participation from a wide group of models.
Funder
Science Mission Directorate
Horizon 2020 Framework Programme
National Science Foundation
National Oceanic and Atmospheric Administration
Subject
Management, Monitoring, Policy and Law,Atmospheric Science,Pollution,Environmental Science (miscellaneous),Global and Planetary Change
Cited by
9 articles.
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