This title appears in the Scientific Report :
2024
Please use the identifier:
http://dx.doi.org/10.34734/FZJ-2024-01693 in citations.
Please use the identifier: http://dx.doi.org/10.5194/acp-24-2033-2024 in citations.
Moist bias in the Pacific upper troposphere and lower stratosphere (UTLS) in climate models affects regional circulation patterns
Moist bias in the Pacific upper troposphere and lower stratosphere (UTLS) in climate models affects regional circulation patterns
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 demonst...
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Personal Name(s): | Ploeger, Felix (Corresponding author) |
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Birner, Thomas / Charlesworth, Edward / Konopka, Paul / Müller, Rolf | |
Contributing Institute: |
Stratosphäre; IEK-7 |
Published in: | Atmospheric chemistry and physics, 24 (2024) 3, S. 2033 - 2043 |
Imprint: |
Katlenburg-Lindau
EGU
2024
|
DOI: |
10.34734/FZJ-2024-01693 |
DOI: |
10.5194/acp-24-2033-2024 |
Document Type: |
Journal Article |
Research Program: |
Climate Feedbacks |
Link: |
Get full text OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.5194/acp-24-2033-2024 in citations.
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. |