W. Huang

Carbon sink estimation of surface carbonate karstification in global karst area

The lithosphere is the most stored reservoir of carbon on Earth. The study of the effects of rock weathering and in the atmosphere provides an important basis for accurate prediction of CO2 in the atmosphere, which is essential for predicting global climate change. One of the main factors that has been neglected in the global carbon cycle study of carbonate weathering carbon sinks is the rate problem. In this paper, some published data were used to study the influence factors of karst carbon sink and the establishment of corrosion velocity model. Based on the data of 18 corrosion test sites in China, a corrosion rate model was fitted, and then the data predicted by the model were compared with the data provided paper of Liu Rui, which are close to the measured data. The validated model can provide a research method for the carbonate certification rate in different regions, and solve the problems that cannot be tested because of time and space constraints. At last, net sink of CO2 in the atmosphere is calculated as 4.77×1014 g·a−1 (or 130 million tC·a−1) in the global surface carbonate certification, which is close to the datameasured by Liu Zaihua and Ichikuni.

Spatial-Temporal Analysis of Carbonate Outcrop in South America with Response of Global CO2 Sink

In current research, carbon cycle for global change are mechanically treated. Generally, climate-physics systems and biological processes were usually as short-time scale, fossil fuel-forming were considered as medium-time scale, and all geological processes (including karstification) were treated as long-term scale. As a result, the influences from geological action were neglected in the process of actual observation and test, which is contrary to the theory of earth science system. Therefore, more effort should be focused on improvement of carbon cycle for global change as well as the redivision of scale action. Most carbonate rocks are susceptible to karstification, although not all are well karstified. Thus the area of carbonate rock outcrop provides an upper limit on the area of exposed karst terrain. In this work, ArcGis software was employed to extract the geological data. Furthermore, the global change in South America carbonate outcrop area were analysed according to the temperature, rainfall and forest area from 1989 to 2010. The results show that impact of temperature on the change of carbonate outcrop area is not obvious. As forest area slightly reduced, the less the reduction of rainfall is, the less the increase is for carbonate outcrop area in Venezuela, Argentina and Bolivia. In addition, GEM-CO2 model was used to estimate the CO2 sink of South American carbonate outcrops, which have increased 2.27 million tons.