Blocking High Pressure Areas in a Warmer Climate
Blocking high-pressure areas are an important component of atmospheric circulation in mid-latitudes and can contribute to the formation of various weather extremes (see e.g. Pfahl and Wernli, 2012). Future changes in the frequency of such blockages could have far-reaching consequences, but there is currently no consensus on the extent of such possible changes. This is partly due to the fact that different definitions and indices used to identify blocking weather situations lead to different results in model projections (see figure).
In this thesis, climate simulations will be analysed to better understand projected future changes in the frequency of blocking high pressure areas. For this purpose, two different indices (which lead to very different results) are set in direct relation to each other.
Prerequisites for this work are the interest in atmospheric dynamics and climate simulations. Basic knowledge of a script language (R, Python), which can be used for data evaluation, is advantageous, but can also be acquired during the work.
- Pfahl, S. and H. Wernli, 2012: Quantifying the relevance of atmospheric blocking for co-located temperature extremes in the Northern Hemisphere on (sub-)daily time scales. Geophys. Res. Lett.39, L12807, doi:10.1029/2012GL052261.
- Woollings, T. et al. (2018): Blocking and its response to climate change. Curr. Clim. Change Rep. 4, 287-300, doi:10.1007/s40641-018-0108-z.