Fig. 3: Tracks, intensities, and large-scale steering flows associated with TC activity in compound MHW-TC events during AM.
From: Compound marine heatwaves and tropical cyclones delay the onset of the Bay of Bengal summer monsoon
BoB TC tracks for (a) compound MHW-TC events and (b) non-MHW events during the AM of 1982-2022. Different categories of TCs are indicated by lines with color-filled circles along each track, and the respective years of each TC (listed in Supplementary Table 1) are marked by numbers along the tracks. The green and red boxplots show the maximum westward longitudinal positions of the TC tracks and the average intensity (unit: kts) of the TCs, respectively. c Differences in large-scale steering flows (vectors; unit: m s−1) with the pressure-weighted mean flow from 850 to 300 hPa and composite daily SSTAs (shading; unit: °C) during the AM, contrasting compound MHW-TC and non-MHW events. The blue contour denotes the coverage area of MHWs. The green and red contours indicate the WNPSH location on the basis of climatology and compound event conditions, respectively. The purple vectors highlight statistically significant zonal or meridional steering flow components at the 0.05 significance level, while the white oblique lines represent the SSTAs exceeding the 0.05 significance level, as determined by bootstrap hypothesis testing.
