Recent research indicates that shifts in the subtropical jet stream are leading to a significant decline in primary production in the Northwest Mediterranean Sea. Experts from the University of Barcelona and the Institute of Marine Science found that a northward move of this high-altitude wind belt reduces nutrient upwelling from the deep sea, essential for phytoplankton growth—the foundation of marine food webs. The study revealed a productivity decline of up to 40% over two decades due to weakened upwelling.
The analysis linked changes in wind patterns to alterations in the marine ecosystem by tracking the jet stream’s position and related ocean dynamics. Lower phytoplankton levels mean less carbon dioxide absorption and ripple effects throughout the food chain, impacting fish stocks and overall marine health.
While findings are specific to the Mediterranean, researchers warn that similar jet stream shifts could affect marine life globally. They emphasize the importance of further studies to explore these dynamics and understand their broader implications. The full study was published in the Journal of Oceanography’s Progress.
Source link
