High‐resolution mapping of the global silicate weathering carbon sink and its long‐term changes

Abstract

Climatic and non‐climatic factors affect the chemical weathering of silicate rocks, which in turn affects the CO2 concentration in the atmosphere on a long‐term scale. However, the coupling effects of these factors prevent us from clearly understanding of the global weathering carbon sink of silicate rocks. Here, using the improved first‐order model with correlated factors and non‐parametric methods, we produced spatiotemporal data sets (0.25° × 0.25°) of the global silicate weathering carbon‐sink flux (SCSFα) under different scenarios (SSPs) in present (1950–2014) and future (2015–2100) periods based on the Global River Chemistry Database and CMIP6 data sets. Then, we analyzed and identified the key regions in space where climatic and non‐climatic factors affect the SCSFα. We found that the total SCSFα was 155.80 ± 90 Tg C yr−1 in present period, which was expected to increase by 18.90 ± 11 Tg C yr−1 (12.13%) by the end of this century. Although the SCSFα in more than half of the world was showing an upward trend, about 43% of the regions were still showing a clear downward trend, especially under the SSP2‐4.5 scenario. Among the main factors related to this, the relative contribution rate of runoff to the global SCSFα was close to 1/3 (32.11%), and the main control regions of runoff and precipitation factors in space accounted for about 49% of the area. There was a significant negative partial correlation between leaf area index and silicate weathering carbon sink flux due to the difference between the vegetation types. We have emphasized quantitative analysis the sensitivity of SCSFα to critical factors on a spatial grid scale, which is valuable for understanding the role of silicate chemical weathering in the global carbon cycle.

A carbon-neutrality-capacity index for evaluating carbon sink contributions

“…The results show that the silicate rocks in Guizhou contributed 11.55% of the SCS in China but accounted for less than 0.01% of the land area, and it contributed 0.5‰ of the global SCS but only accounted for only 0.001‰ of the global land area [ 8 , 10 , 11 , [35] , [36] , [37] ]. In addition, as shown in Fig.…”

Climate change enhanced the positive contribution of human activities to net ecosystem productivity from 1983 to 2018

“…The Precipitation (P) and Temperature (T) data were obtained from GLDAS-2.1 datasets provided by the National Aeronautics and Space Administration (NASA), 2 with a spatial resolution of 0.25 • from 01/1983 to 12/2018 (Li et al, 2022;Song et al, 2022;Xiong et al, 2022). The SR dataset derived from the THRGPU (Terrestrial Hydrology Research Group of Princeton University).…”

The Spatial and Temporal Evolution Pattern and Transformation of Urban–Rural Construction Land in Karst Mountainous Areas: Qixingguan District of Guizhou, Southwest China

“…(4) Research results on carbon peaking and carbon neutralization surge since the double carbon target was proposed [62,63], the carbon emissions of urban-rural construction have attracted more attention [64]. In order to optimize carbon neutrality in new urbanization construction, more studies should be conducted that combine the processes of carbon emission reduction and carbon trading, relying on this huge carbon sink [65] to achieve the goal of carbon neutrality [66].…”