adds subsection on stochastic coupling to documentation

doc/src/raw_exchange.dox

@@ -55,6 +55,16 @@ are supposed to receive a fixed value, based on the interpolation information
 provided by YAC, do not overlap with any unmasked source cell and can be handled
 accordingly.
 
+\subsection desc_raw_exchange_stochastic Stochastic coupling
+
+\ref Rackow_2020 "Rackow 2020" proposes to use a stochastic-based coupling
+approach, when coupling atmospheric and oceanic surface fields. This approach
+can produce improved coupling results in case grid resolutions of both
+components differ significantly.
+
+Stochastic coupling is not supported by YAC. However, a target component
+should easily be able to implement it, if raw data exchange is used.
+
 \section usage_raw_exchange Usage in YAC
 
 \subsection enable_raw_exchange Enabling raw data exchange
@@ -670,4 +680,10 @@ grid for the IOW Earth System Model (version 1.04.00) of the Baltic Sea
 region, Geosci. Model Dev., 17, 1689–1708,
 https://doi.org/10.5194/gmd-17-1689-2024, 2024.
 
+\anchor Rackow_2020
+Rackow T, Juricke S. Flow-dependent stochastic coupling for climate models
+with high ocean-to-atmosphere resolution ratio.
+Q J R Meteorol Soc. 2020; 146: 284–300.
+https://doi.org/10.1002/qj.3674
+
  */