Effect of SST-front on the sub-seasonal prediction in North Atlantic winter circulation using the JMA operational seasonal prediction system ...

• Main Authors: Naoe, Hiroaki, Adachi, Yukimasa, Kubo, Yutaro
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: North Atlantic
• Online Access: https://dx.doi.org/10.57757/iugg23-0767; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016718

<!--!introduction!--> The mid-latitude ocean front has a considerable impact on the local climate and that the representation of the atmospheric structure was well reproduced for simulations using finer SST resolutions with models driven by SST with different resolutions. Although the mid-latitude oceanic front would play a role in improving the accuracy of seasonal forecasts, the impact on forecast accuracy is still poorly understood. Thus, in this study, we investigate the influence of the mid-latitude oceanic front on forecasting using the latest seasonal forecasting system of the Japan Meteorological Agency. Here, we focus on intra-seasonal predictions (mainly 3-4th week predictions) in the North Atlantic region in winter, by comparing hindcast experiments with different ocean model resolutions in 30 years of 1991-2020. It is found that the low-resolution model shows SST cooling south of the mid-latitude oceanic front and the weakening of local lower tropospheric circulation in response to the SST, ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...