DA_Team 3
1. Lower-Level Comparison: Landfall Period
At both 850 hPa and 925 hPa, ERA5 shows a compact and asymmetric wind field around the storm center.
The strongest wind zone is concentrated on the right side of the storm, near the southern coast of Korea.
In contrast, JRA-55 presents a broader and smoother wind distribution, with the strong-wind area spread over a wider region.
This suggests that ERA5 captures the localized lower-level wind structure near landfall more sharply than JRA-55.
The vertical cross-section confirms the asymmetric wind structure shown in the horizontal maps.
In ERA5, strong winds are concentrated on the positive longitude side of the storm center, corresponding to the right side of the storm.
ERA5 also shows a sharper transition from the calm eye region to the intense eyewall wind zone.
JRA-55 has a broader and smoother eye-like region, indicating a less sharply resolved storm structure.
Negative values near the ERA5 storm center indicate that JRA-55 represents stronger winds in the area where ERA5 identifies a calm eye region.
Positive values around southern Korea and the East Sea indicate that ERA5 produces stronger winds along the eyewall and coastal impact zone.
The ERA5 center is closer to the best-track position, while the JRA-55 center is displaced southwestward.
This center-position difference suggests a structural mismatch between the simulated storm center and the main wind field in JRA-55.
ERA5 represents Typhoon Hinnamnor’s lower-level structure as more compact, asymmetric, and dynamically organized at landfall.
JRA-55 shows a smoother and broader wind field, with a less distinct eye and a displaced storm center.
Therefore, the two reanalysis datasets can lead to different interpretations of landfall intensity and regional wind-impact distribution.
Overall Interpretation