High‐Resolution Data Sets for Global Carbonate and Silicate Rock Weathering Carbon Sinks and Their Change Trends

Abstract

The Carbonate rock weathering Carbon Sink (CCS) and Silicate rock weathering Carbon Sink (SCS) play a significant role in the carbon cycle and global climate change. However, the spatial‐temporal patterns and trends of the CCS and SCS from 1950 to 2099 have not been systematically quantified. Thus, Supported by long‐term hydrometeorological data under the RCP8.5, we use the accepted Suchet and Hartmann models to determine the following. First, we found except for the difference in their weathering rates, the SCS covers 37.2 million km2 more area than the CCS. The CCS Flux (CCSF) and SCS Flux (SCSF) are 5.36 and 1.22 t/km2/yr, respectively. Similarly, the Full CCS (FCCS, 0.3 Pg/yr) is more than the Full SCS (FSCS, 0.08 Pg/yr). Furthermore, the CCS (7.01 kg/km2) and SCS (3.95 kg/km2) are in a state of overall increase. In addition, the mid‐to‐high latitudes of the northern hemisphere are aggravated by warming (0.03°C) and humidity (0.65 mm), while the decrease in runoff in the mid‐latitudes of the southern hemisphere reduces karstification. Specifically, by 2099, the CCSF in the mid‐latitudes of the southern hemisphere will decrease by 5.72%. Instead, the CCSF in the northern hemisphere and lower latitudes of the southern hemisphere will exhibit a gentle upward slope. Particularly, the peak regions of the global FCCS (65.63 Tg/yr) and FSCS (33.01 Tg/yr) are the tropical zone. In conclusion, this study contributes a high‐resolution and long‐time series CS datasets for the CCS and SCS. We provide data and a theory for solving terrestrial carbon sink loss.

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.…”

“…The main reasons are as follows: (1) not all karst water turn forms stalagmites and stalactites [ 12 , 32 ]; (2) not all karst water enters the ocean and becomes coral reefs. This process takes 3000 years or even longer [ 35 , 36 ]. In addition, the fifth IPCC assessment report highlights that the chemical weathering of carbonate rocks can not only produce a carbon sink but can also store and stabilize this sink on the scale of 1000–10000 years.…”

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

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