Penguin Droppings May Boost Antarctic Cloud Cover and Help Cool the Climate

Penguin droppings may be contributing to increased cloud formation over Antarctica—potentially helping to mitigate regional climate change. A recent study published in Communications Earth & Environment reveals that gases emitted from penguin excrement play a key role in forming cloud condensation nuclei (CCN), which are the tiny particles around which clouds form.

The primary gas released from penguin waste is ammonia, which can combine with sulfur compounds emitted by oceanic phytoplankton to form CCN. These clouds can reflect more sunlight, potentially reducing surface temperatures. Scientists are particularly interested in cloud dynamics over the Southern Ocean and Antarctic region due to their significant influence on global climate systems.

At Argentina's Marambio Station on the Antarctic Peninsula, large colonies of Adélie penguins have long covered the snow and soil with droppings. To investigate their impact on cloud formation, researchers from the University of Helsinki measured concentrations of atmospheric gases such as ammonia and dimethylamine in the area. They found that ammonia levels near penguin colonies reached up to 13.5 parts per billion—1,000 times higher than in penguin-free zones.

Observations showed that when winds blew from penguin nesting areas, aerosol particle concentrations surged dramatically, often accompanied by mist. Overall, penguin droppings increased the rate of atmospheric particle formation by up to 10,000 times. Remarkably, even after penguins migrated away, their "fertilization effect" persisted—ammonia emissions remained 100 times above baseline a month later.

The study highlights the surprising influence of biological activity on atmospheric processes and offers new insights into cloud formation mechanisms in Antarctica.