Climate change is occurring today because of a buildup of carbon dioxide (CO2) in the atmosphere. This buildup of CO2 is mostly from burning fossil fuels for our energy needs. The oceans take up and store a lot of CO2 from the atmosphere. To know how much CO2 the oceans take up, we must understand the processes involved. These processes include the mixing of ocean water. Turbulent mixing is a fast and effective way to mix up ocean water, and it happens when for example wind blows over the ocean and creates waves. However, it is difficult to measure turbulent mixing close to the ocean surface. In this article, we describe how we overcame this problem and how we used our measurements to learn about the exchange of carbon dioxide between the atmosphere and the oceans.