Скачать с ютуб Dr. Hal Bradbury, chemical oceanographer в хорошем качестве

Dr. Hal Bradbury, chemical oceanographer

I’m excited about carbon cycling in the sediments and how they link to the overlying ocean. We understand that the carbon cycle is key to controlling the Earth’s climate, and that the main sink of carbon from the surface to solid earth is in the oceans, where it is deposited as carbonate minerals and inorganic carbon on the seafloor. What I'm interested in is what happens to this carbon once it's deposited: it could either just be preserved as it was deposited, or it can be broken down by a series of different microbial reactions. These interactions control what form the carbon is stored in and whether it is released back into the ocean. There are also lots of other elements involved in these processes, which can be either released or consumed, influencing geochemical cycles on a global scale. I want to use my expertise in stable isotope tracers to look at carbonate mineral precipitation and dissolution. I will also use carbon and oxygen isotopes to look at the organic side of things and magnesium isotopes to look at silicate reactions occurring in the sediments. I will also use numerical modelling to fully understand the processes controlling the isotope signals. The most important thing I hope the students come away with from my courses is the interconnectivity between different areas of study. If someone wants to understand past conditions of the Earth, they need to learn about what happened in the past ocean, but also what happened in the atmosphere and sediments. I hope that over the course of a degree, students can understand how different modules are linked with each other and be able to piece together an overall picture of the global environment.