How do scientists judge weather and disasters according to tree rings?

Sulfur dioxide is not suitable. There is a condition for studying climate change, that is, things that record climate change are stable and not affected by human activities. The growth of coral is related to the weather at that time, for example, the growth speed of coral is different at different temperatures, thus establishing a functional relationship between coral growth and temperature. By observing and recording corals in different ages (generally dating by isotopes), we can invert the weather conditions at that time and study climate change through functional relationships. A key factor here is that corals live in the ocean, especially those undisturbed waters, thus truly recording climate change. If it is a place where people live, it is impossible. Human activities destroy this functional relationship and invalidate the data. One more thing, coral reefs were formed a long time ago, and climate change is a matter of time sequence. It is too short to analyze anything. The rings are the same. Ice cores mainly rely on layered structure, and the ice in glaciers is basically formed by snow extrusion. The thickness of snowfall is different every year, and the thickness of each layer is also different. The snowfall in winter and summer is also different, forming a layered structure. In addition, the snow contains the air at that time, forming bubbles in the ice core. Analysis of air components, such as carbon dioxide, from these bubbles can well reflect the atmospheric environment at that time. There is also a material suitable for climate analysis, loess. As for the sulfur dioxide in the atmosphere, it is simply the state at the moment, and it is also the result of a lot of human intervention. You can't do climate analysis.