Distinct Influences of the Pacific Meridional Mode and ENSO on Tropical Cyclone Intensity Change Rate over the eastern North Pacific

Title
Distinct Influences of the Pacific Meridional Mode and ENSO on Tropical Cyclone Intensity Change Rate over the eastern North Pacific
Author(s)
Kim, Sung Hun; Chu, Pao-shin; Choi, Yu Mi; Kang, Hyoun Woo; Kang, Sok Kuh
KIOST Author(s)
Kim, Sung Hun(김성훈)Choi, Yu Mi(최유미)Kang, Hyoun Woo(강현우)Kang, Sok Kuh(강석구)
Alternative Author(s)
김성훈; 최유미; 강현우; 강석구
Publication Year
2022-08-18
Abstract
In this study, the effects of ENSO and Pacific meridional mode (PMM) on eastern North Pacific (ENP) tropical cyclone (TC) intensity change, rapid intensification (RI) and rapid weakening (RW) rates are investigated. Based on the distribution of the mean 24-hour TC intensity change rate and the TC track density, we divided ENP into the main intensification region (MIR) and main weakening region (MWR) and examined the influence of climate factors on these two regions. The ENSO is closely related to the ocean temperature of the MIR and the vertical wind shear of the MWR. PMM is highly associated with the ocean temperature and the low-level relative humidity in the MWR. Changes in the environmental parameters of the two regions by two climate modes are significantly related to TC intensity change rate. In the positive (negative) phase of ENSO, there was an increase (decrease) in TC intensity change rate in the MIR and a decrease (increase) in the MWR, respectively. In the positive phase (negative phase) of the PMM, an increase (decrease) in TC intensity change rate is observed in the MWR, but there is no significant change by PMM in the MIR. Most RI events in the ENP occur in MIR, whereas RW occurs mostly in the MWR (except landfall). Therefore, ENSO is closely correlated with the TC intensity change rate of MIR, which showed a high positive correlation with RI rate. Conversely, the PMM associated with the TC intensity change rate in the MWR showed a negative correlation with the RW rate. It is expected that the regional tendency of TC intensity change rate and RI, RW rate according to the phase of each climate mode can be used as important information in the ENP’s TC intensity prediction.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/43194
Bibliographic Citation
제3회 KGU 연례학술대회, 2022
Publisher
한국지구과학연합회
Type
Conference
Language
Korean
Publisher
한국지구과학연합회
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