Figure 1
Best tracks of TC Seroja (red labels) and TC Odette (blue labels) with wind speed (color) and atmospheric pressure (size of dots). Label represents date (yyyy-mm-dd) and time (hh:mm) in UTC. Three regions of Interests (ROI) are indicated with circles in dashed gray lines. Arrows indicate direction of TCs propagation.
Figure 2
Sea-surface temperature (SST) anomalies in three regions of interest (ROI) for a) 3 April, b) 14 April and c) 2 May 2021. Tracks of TC Seroja (black) and Odette (red) are shown (open circle) with current position (filled circles). Dotted line in b) shows the northeast extension of the track after absorption of TC Odette into TC Seroja and sudden change in direction. The rectangle in the upper left corner shows the area of origin of TC Seroja with clear SST cooling described by Avrionesti et al. (2021).
Figure 3
Distribution and box-whisker plots of the SST distribution in the regions of interests.
Figure 4
Temperature depth profiles of float 5905414 and 5902489 in the ROI_1. Smaller circles in the map represent radii of maximum wind speed. Larger circles represent radii of a wind speed of 63 km h–1.
Figure 5
Upward velocity (European Union-Copernicus Marine Service, 2016) at the positions a) –20.500 N, 109.167 E near the ascend of ARGO float 5905414 on the 09 April 2021, b) –20.833 N, 108.000 near position of TC Seroja on 10 April at 05:00 UTC with the sudden turn, c) –20.083 N, 108.583 E near the ascend of ARGO float 5902489 on the 12 April 2021 and d) –16.500 N, 105.830 E in center of region ROI_2. The right images show a spatial (top 150 meters) and temporal (8 April to 14 April 2021 for a–c) zoomed-in area of the left image. Positions are in close proximity to the ascends of the ARGO floats due to the resolution of the model. Dotted lines represent the ascend of the ARGO floats on the given dates and UTC times, and dashed lines represent the passage of TC Seroja.
Figure 6
Drifter data of SVP drifter 1501527 near the track of TC Seroja. a) Tracks of TC Seroja and TC Odette and the trajectory of SVP drifter 1501527. b) Zoomed area marked by the black box in a). The color scale shows the date of the tracks and trajectories. c) Time series of the drifter velocity derived from the position data of the drifter, blue shading indicates the sudden change in velocity. d) Time series of the SST observed by the drifter along its trajectory, blue shading indicates the observed cooling.