FROM FRESH- TO SEA-WATER AND FROM SHALLOW TO DEEP - A TURBULENCE PERSPECTIVE

Turbulence is an important process governing the mixing of fluid properties in nature. Nowadays, it remains a complex topic in oceanography, and other fields, due to its inherent stochastic nature. It is important in many areas of research, and there are many unresolved problems regarding the understanding of turbulence and the role it is playing in different processes. In my research, I am trying to address some of those questions. The first problem which I am investigating is related to the study of turbulence within the mesoscale eddy system. For the first time, turbulence was estimated from microstructure velocity and temperature fluctuations measured within an anticyclonic eddy originating from the Loop Current in the Gulf of Mexico. This study aims to provide a unique set of measurements that will allow resolving the dynamics of physical and biogeochemical processes related to eddies and shelf processes. The second problem is devoted to the parameterization and estimation of a gas exchange coefficient in river environments. The gas exchange between water bodies and the air is difficult to measure. Thus the Wanninkhof methodology (Wanninkhof et al., 2014) to approximate air-sea gas exchange solely based on wind speed is widely used. However, this approximation may not work in river environments. In rivers, water currents may play a more important role in governing gas exchange than wind. In this study, I compare different approaches to estimate the gas exchange coefficients using field observations during the summer of 2016 on the Yenisei River