Figure 9. Same as Fig. 8, but for TNn.
Fig. 10 exhibits the spatial distributions of the multi-model median SNR
for TXx and TNn under SSP5-8.5 and RCP8.5 in the year 2050, for which
the signal is in Figs. S21. Under both SSP5-8.5 and RCP8.5, despite
exhibiting different spatial patterns, the magnitudes of SNR for TXx and
TNn are already above 1 over most Australian regions in 2050. For TXx
(Fig. 10a, c), there are larger SNR values (>2) over
northwest Australia and lower SNR values (>1) over
southwest regions. In contrast, the SNR for TNn (Fig. 10b, d) is more
than 2 over western and central Australia and indicates lower values
(>1) over tropical and southeast regions. As described in
Frame et al. (2017), around mid-century, the regions exhibiting SNR
> 1 suggest that there would be “unusual” climate
compared to the recent climate over 1950-2005; and for TXx over
northwest Australia and TNn over western and central regions, the new
climate for the extremes would be “unfamiliar” (SNR > 2).
Compared to RCP8.5, SSP5-8.5 in CMIP6 generally displays stronger SNR
and the corresponding signal for the two indices, which is valid for
other SSPs and RCPs (Figs. S22 and S23).