Frontiers in Marine Science

EISSN: 2296-7745

9:844003

SCIE

[논문]Role of Salinity-Induced Barrier Layer in Air-Sea Interaction During the Intensification of a Typhoon

Ji-Seok Hong, Jae-Hong Moon

홍지석, 문재홍

Taekyun Kim, Sung Hyup You, Kun-Young Byun and Hyunmin Eom

A pronounced increase in the intensification of Typhoon Bavi in 2020 was detected when
the typhoon passed over the Changjiang plume in the northern East China Sea. Using
a coupled atmosphere-ocean modeling system, this study investigates the role of the
plume-induced barrier layer (BL) in the air–sea interaction during the intensification of a
typhoon. Simple comparative experiments with and without the river plume revealed a
strong relationship between BL formation and typhoon intensification as a result of the
significant surface freshening discharged from the Changjiang River. The plume-induced
BL maintained a warm sea surface before the typhoon approached, thereby influencing
the energy transfer at the air–sea interface. The enthalpy and moisture reaching the
atmosphere were increased by approximately 20%, leading to the intensification of
Typhoon Bavi and providing further support for the results observed in the besttrack record. The model comparison also indicates that the salinity-induced BL led to
the reduction of the typhoon-induced SST cooling by restricting the vertical diffusion
between the surface and the thermocline, and consequently contributed to maintaining
the typhoon intensity. This study suggests that the effect of river-induced surface
freshening in a coupled atmosphere-ocean model may help in improving typhoon
forecasts and may aid in mitigating against the destructive power of typhoons in
the future.

2022.03.01.

doi:10.3389/fmars.2022.844003