Strongest difference is visible 50–100 km to
the left of the track of typhoon Jangmi where the cold wake
of typhoon Hagupit is located. In HHJ run this part of the
ocean was strongly disturbed by Hagupit; thus mixed layer
was cooled and deepened. Additional cooling due to passage
of Jangmi was only 0.3 C. If there were no Hagupit,
downward momentum transport and mixing enhanced by typhoon
Jangmi would have accounted for twice as strong mixing
in this location. The different horizontal distributions of
temperature anomaly simulated with the same atmospheric
forcing suggest that disturbed and undisturbed ocean initial
conditions, especially the initial MLD, influenced not only
the amplitude of the anomaly but also its spatial distribution.
Figure 13 presents the double-TC temperature anomaly vertical
cross section averaged over an inertial period. Since a typhoon
passage produces inertial oscillations in the ocean, we
average the simulation results over 40 h period (roughly the
period of inertial oscillations at 17.5 N) to remove them. The
abscissa in the plot represents the distance from the Jangmi
track, and the ordinate represents the ocean depth. The ordinate
position is at the typhoon center. The surface cold
anomaly is seen to be approximately 0.4 C both to the right
and left side of the track. Beneath the surface, there is an alternating
positive and negative double-TC anomalies extending
across the typhoon track with a larger and more complex
pattern on the left side of typhoon. This is due to a disturbed
initial upper ocean on the left of Jangmi due to Hagupit. The
subsurface net cooling down to about 50m would have been
stronger if there were no typhoon Hagupit.