Research on climate change based on carbonate porosity analysis in Jinping, China

Therefore, the Jinping area is an ideal karst area for climate change research. In this study, nine rock samples from the Jinping area were selected and analyzed (Fig 1). In Fig 1, a(1) shows a carbonate rock sample from Jinping: and a(2) is a carbonate rock specimen prepared from the sample shown in a(1) using the TCRM. Fig 1b shows a map of the Jinping area. Fig 1c(1) shows a rock slide made from the sample shown in Fig 1a(1).Fig 1c(2) shows a polarized image of the sample in Fig 1c(1) taken using a polarizing microscope. Fig 1c (3) shows the gray value curve for the sample shown in Fig 1c(2). Whether carbonate rocks can be used to study climate change through image analysis of polarized light microscopy images depends on whether the polarized light microscopy images of carbonate rocks are suitable for research using image analysis technology. A comparison of the research results obtained using TCRM and the image analysis method can confirm whether the polarized microscopy images of carbonate rock are suitable for image analysis.Fig 2d(1) shows the conversion of the slide image into a binary image by using the R threshold to calculate the porosity.Fig 2d(4) presents the R value change curve. Fig 2d(2) shows the conver- sion of the slide image into a binary image by using the G threshold to calculate the porosity. Fig 2d(5) presents the G value change curve. Fig 2d(3) shows the conversion of the slide image into a binary image by using the B threshold to calculate the porosity. Fig 2d(6) presents the B

value change curve. Through the analysis of these curves, it is easy to identify the threshold value of polarized microscopic images of carbonate rocks, as shown in Fig 2d(7). Fig 2d(7) shows the thresholds for the red-green-blue (RGB) values and grayscale values in Figs 1c(3), Fig 1. Study area and samples. https://doi.org/10.1371/journal.pone.0281630.g001 PLOS ONE Research on climate change based on carbonate porosity analysis in Jinping PLOS ONE | https://doi.org/10.1371/journal.pone.0281630 March 30, 2023 4 / 21