Fig. 5: Sensitivity of the tropical terrestrial carbon sink to temperature simulated by the CMIP6 models. | Nature Communications

Fig. 5: Sensitivity of the tropical terrestrial carbon sink to temperature simulated by the CMIP6 models.

From: Recent decrease of the impact of tropical temperature on the carbon cycle linked to increased precipitation

Fig. 5

a, Ensemble mean of \({{{{\rm{\gamma }}}}}_{{{{\rm{NBP}}}}}^{{{{\rm{T}}}}}\). The sensitivities are calculated using a multiple regression approach referring to Eq. 1 (see Methods) using a moving window of 20 years. Only 27 ESMs with significant correlations (P < 0.05) between tropical NBP and temperature identified under very wet and very dry conditions are used. The standard deviation (σ) of the detrended precipitation is used to determine very wet (σ ≥ 1) and very dry (σ < −1) conditions. The sign of NBP is inverted to be comparable with CGR. The error bars denote 1 SD of \({{{{\rm{\gamma }}}}}_{{{{\rm{NBP}}}}}^{{{{\rm{T}}}}}\) among 27 ESMs. b, \({{{{\rm{\gamma }}}}}_{{{{\rm{NBP}}}}}^{{{{\rm{T}}}}}\) at very dry conditions as a function of \({{{{\rm{\gamma }}}}}_{{{{\rm{NBP}}}}}^{{{{\rm{T}}}}}\) at very wet conditions. The red line is the 1:1 line and the blue line is the fitted regression line. The point labeled with A in red color denotes observed \({{{{\rm{\gamma }}}}}_{{{{\rm{CGR}}}}}^{{{{\rm{T}}}}}\) under very wet and dry conditions and the remaining labels of B, C, D… correspond to individual ESMs (shown in Supplementary Table 4).

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