@article{Curtis:2020:1748-9326/ab8331,
author = {Curtis, PE and Ceppi, P and Zappa, G},
doi = {1748-9326/ab8331},
journal = {Environmental Research Letters},
pages = {1--7},
title = {Role of the mean state for the Southern Hemispheric Jet Stream response to CO forcing in CMIP6 models},
url = {http://dx.doi.org/10.1088/1748-9326/ab8331},
volume = {15},
year = {2020}
}

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TY  - JOUR
AB  - Global climate models indicate that the Southern Hemispheric (SH) jet stream shifts poleward in response to CO2 forcing, but the magnitude of this shift remains highly uncertain. Here we analyse the SH jet stream response to 4×CO2 forcing in Coupled Model Intercomparison Project phase 6 (CMIP6) simulations, and find a substantially muted jet shift during winter compared with CMIP5. We suggest this muted response results from a more poleward mean jet position, consistent with a strongly reduced bias in jet position relative to the reanalysis during 1980--2004. The improved mean jet position cannot be explained by changes in the simulated sea surface temperatures. Instead, we find indications that increased horizontal grid resolution in CMIP6 relative to CMIP5 has contributed to the higher mean jet latitude, and thus to the reduced jet shift under CO2 forcing. These results imply that CMIP6 models can provide more realistic projections of SH climate change.
AU  - Curtis,PE
AU  - Ceppi,P
AU  - Zappa,G
DO  - 1748-9326/ab8331
EP  - 7
PY  - 2020///
SN  - 1748-9326
SP  - 1
TI  - Role of the mean state for the Southern Hemispheric Jet Stream response to CO forcing in CMIP6 models
T2  - Environmental Research Letters
UR  - http://dx.doi.org/10.1088/1748-9326/ab8331
UR  - https://iopscience.iop.org/article/10.1088/1748-9326/ab8331
UR  - http://hdl.handle.net/10044/1/79029
VL  - 15
ER  - 

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