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- Title
Moist bias in the Pacific upper troposphere and lower stratosphere (UTLS) in climate models affects regional circulation pattern.
- Authors
Ploeger, Felix; Birner, Thomas; Charlesworth, Edward; Konopka, Paul; Müller, Rolf
- Abstract
Water vapour in the UTLS is a key radiative agent and crucial factor in the Earth's climate system. But global climate models face problems with simulating the largest UTLS moisture anomaly in the boreal summertime Asian monsoon region and simulate a common regional moist bias in the Pacific UTLS. We demonstrate from combination of climate model experiments and atmospheric observations that the Pacific moist bias critically impacts regional circulation systems by inducing local longwave cooling. Related impacts involve a strengthening of isentropic potential vorticity gradients, strengthened westerlies in the Pacific westerly duct region, and a zonally extended anticyclonic monsoon circulation. We further show that the regional Pacific moist bias can be significantly reduced by applying a Lagrangian, less diffusive transport scheme and that such model improvement could be an important factor for improving simulation of regional circulation systems, in particular in the Asian monsoon and Pacific region.
- Subjects
ATMOSPHERIC models; CLIMATE change models; MONSOONS; STRATOSPHERE; TROPOSPHERE; WATER vapor
- Publication
Atmospheric Chemistry & Physics Discussions, 2023, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/egusphere-2023-2196