AUTHOR=Zhou Guanbo , Du Jia , Cao Jie , Liu Lu , Li Xingyu 

TITLE=Comparative analyses of the effects of divergent winds on the kinetic energy budget with the adoptions of two methods during the extratropical transition of Typhoon Rumbia (1818)

JOURNAL=Frontiers in Earth Science

VOLUME=Volume 10 - 2022

YEAR=2023

URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2022.1004350

DOI=10.3389/feart.2022.1004350

ISSN=2296-6463

ABSTRACT=Modification of the divergent wind components as well as domain of interests can result in obvious changes in kinetic energy (KE) budget of typhoons and other synoptic systems. Before analyzing the effects of divergent winds on KE budget of Typhoon Rumbia (2018) during its entire life cycle, especially in its extratropical transition (ET) process, a hybrid integral method to partition the horizontal wind fields in a limited domain with high accuracy is adopted in comparison with the commonly-used iterative method under two sets of domains, i.e., the typhoon following domain and the outermost domain that covers the entire typhoon track. The relative importance of the divergent and non-divergent winds in the KE budget is investigated in the three stages of ET process, namely the pre-development, re-intensification and dissipation stages. It is found that the divergent winds computed by the iterative method with lower accuracy result in sizable errors in spatio-temporal variations of the KE of typhoon during its ET process, which thus leads to obvious forecasting errors.