Journal Article

FZJ-2024-01693

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Moist bias in the Pacific upper troposphere and lower stratosphere (UTLS) in climate models affects regional circulation patterns

Ploeger, F. (Corresponding author)FZJ* ; Birner, T. ; Charlesworth, E.FZJ* ; Konopka, P.FZJ* ; Müller, R.FZJ*

2024
EGU Katlenburg-Lindau

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Please use a persistent id in citations: doi:10.5194/acp-24-2033-2024  doi:10.34734/FZJ-2024-01693

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.

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Contributing Institute(s):

1. Stratosphäre (IEK-7)

Research Program(s):

1. 2112 - Climate Feedbacks (POF4-211) (POF4-211)

Appears in the scientific report 2024

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