Understanding uncertainties in projections of western North Pacific tropical cyclogenesis

Reliable projections of tropical cyclone (TC) activities in the western North Pacific (WNP) are crucial for climate policy-making in densely-populated coastal Asia. Existing projections, however, exhibit considerable uncertainties with unclear sources. Here, based on future projections by the latest...

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Bibliographic Details
Published in:Environmental research letters 2023-11, Vol.18 (11), p.114037
Main Authors: Huang, Xin, Zhou, Tianjun, Chan, Johnny C L, Zhan, Ruifen, Chen, Ziming, Zhao, Jiuwei
Format: Article
Language:English
Subjects:
Climate models
Climate policy
Cyclogenesis
Environmental factors
ENVIRONMENTAL SCIENCES
future projection
projection uncertainty
tropical cyclone
Tropical cyclones
Uncertainty
western North Pacific
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Summary:Reliable projections of tropical cyclone (TC) activities in the western North Pacific (WNP) are crucial for climate policy-making in densely-populated coastal Asia. Existing projections, however, exhibit considerable uncertainties with unclear sources. Here, based on future projections by the latest Coupled Model Intercomparison Project Phase 6 climate models, we identify a new and prevailing source of uncertainty arising from different TC identification schemes. Notable differences in projections of detected TCs and empirical genesis potential indices are found to be caused by inconsistent changes in dynamic and thermodynamic environmental factors affecting TC formations. While model uncertainty holds the secondary importance, we show large potential in reducing it through improved model simulations of present-day TC characteristics. Internal variability noticeably impacts near-term projections of the WNP tropical cyclogenesis, while the relative contribution of scenario uncertainty remains small. Our findings provide valuable insights into model development and TC projections, thereby aiding in adaptation decisions.
ISSN:1748-9326
1748-9326
DOI:10.1088/1748-9326/ad02ad