Climate change impacts ocean circulation by altering the temperature and salinity gradients in the water, which can disrupt established currents. Changes in ocean circulation have significant implications for global climate systems, affecting weather patterns, marine ecosystems, and fish migration. For example, altered currents can lead to changes in upwelling zones that influence nutrient availability and species distribution. Understanding these changes is crucial for predicting the impacts of climate change on marine life and global climate patterns, helping to inform conservation and management strategies.