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@ARTICLE{Ploeger:1023129,
author = {Ploeger, Felix and Birner, Thomas and Charlesworth, Edward
and Konopka, Paul and Müller, Rolf},
title = {{M}oist bias in the {P}acific upper troposphere and lower
stratosphere ({UTLS}) in climate models affects regional
circulation patterns},
journal = {Atmospheric chemistry and physics},
volume = {24},
number = {3},
issn = {1680-7316},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2024-01693},
pages = {2033 - 2043},
year = {2024},
abstract = {Water vapour in the upper troposphere and lower
stratosphere (UTLS) is a key radiative agent and a crucial
factor in the Earth's climate system. Here, we investigate a
common regional moist bias in the Pacific UTLS during
Northern Hemisphere summer in state-of-the-art climate
models. We demonstrate, through a combination of climate
model experiments and satellite observations, that the
Pacific moist bias amplifies local long-wave cooling, which
ultimately impacts regional circulation systems in the UTLS.
Related impacts involve a strengthening of isentropic
potential vorticity gradients, strengthened westerlies in
the Pacific westerly duct region, and a zonally displaced
anticyclonic monsoon circulation. Furthermore, we show that
the regional Pacific moist bias can be significantly reduced
by applying a Lagrangian, less-diffusive transport scheme
and that such a model improvement could be important for
improving the simulation of regional circulation systems, in
particular in the Asian monsoon and Pacific region.},
cin = {IEK-7},
ddc = {550},
cid = {I:(DE-Juel1)IEK-7-20101013},
pnm = {2112 - Climate Feedbacks (POF4-211)},
pid = {G:(DE-HGF)POF4-2112},
typ = {PUB:(DE-HGF)16},
UT = {WOS:001190484800001},
doi = {10.5194/acp-24-2033-2024},
url = {https://juser.fz-juelich.de/record/1023129},
}