His primary areas of study are Atmospheric sciences, Stratosphere, Environmental science, Atmospheric sounding and Climatology. His Atmospheric sciences research is multidisciplinary, relying on both Atmospheric chemistry and Altitude. His Stratosphere research incorporates themes from Atmosphere, Ozone and Mixing ratio.

The concepts of his Atmospheric sounding study are interwoven with issues in Lidar and Spectral bands. T. von Clarmann focuses mostly in the field of Polar vortex, narrowing it down to topics relating to Ozone depletion and, in certain cases, Vortex. His Middle latitudes study integrates concerns from other disciplines, such as Seasonality and Latitude.