Large-scale circulation refers to the patterns of atmospheric circulation on a global or hemispheric scale. This includes the movement of air masses, jet streams, and high and low pressure systems that determine weather patterns and climate on a large scale. Large-scale circulation is influenced by factors such as the rotation of the Earth, the distribution of land and water, and changes in temperature and pressure gradients. Understanding large-scale circulation patterns is crucial for predicting long-term weather patterns, climate trends, and the impact of climate change on global atmospheric circulation.