Strong winds have whipped up sea foam at a popular North-east harbour.
Our photographer Kath Flannery captured these images in Stonehaven this morning.
Reader Iain Henderson sent in these pictures of sea foam near Nigg yesterday.
Sea foam is created when strong winds generate large numbers of breaking waves in an area that contains a large amount of dissolved organic matter, such as proteins and fats present in the water.
The combination of the waves and the dissolved organics create little bubbles, these stick together through surface tension to create the foam, also known as spume or beach foam.
Algal blooms are one common source of the organic matter required to create the sea foams, however in some cases they can come from sewage and detergents that have made their way into the water.
The North-east coast is no stranger to sea foam as large amounts have been produced near Footdee, as shown above in 2012, and in Stonehaven, below, in October 2014.
While generally not harmful to people – sea foam is often an indication of a productive sea ecosystem. The foam can cover rocks or other slip hazards. In some instances, however, it can cause irritation.