PSC Encore, The Great Ireland/UK Nacreous Cloud Episode - OPOD

Last updated on September 16, 2023

PSC Encore: The Great Ireland/UK Nacreous Cloud Episode

In early February 2016, an awe-inspiring atmospheric phenomenon known as the "PSC Encore" occurred over Ireland and the UK. This event, which lasted from January 31st to February 3rd, brought about a stunning display of nacreous clouds and had significant implications for the ozone layer in the region.

Nacreous clouds, also referred to as polar stratospheric clouds, are a type of cloud formation that occurs in the stratosphere at high altitudes. These clouds are composed of ice crystals and are known for their iridescent colors, which shimmer and change as sunlight interacts with the tiny particles within them. During the PSC Encore, these nacreous clouds adorned the sky, creating a breathtaking spectacle before dawn and after sunset. What made this event particularly remarkable was the fact that these clouds were even visible during daylight hours.

Accompanying the nacreous clouds were acidic droplet clouds, known as PSC Type I clouds. While these clouds may seem ominous, they are actually a natural occurrence. However, they have the potential to eat away at the ozone layer. The prolonged presence of these acidic clouds over Ireland and the UK during the episode had a noticeable impact on the stratosphere. As a result, the stratosphere became warmer, and the ozone hole in the region began to heal.

The healing of the ozone hole is an encouraging development. Stratospheric ozone plays a crucial role in protecting life on Earth by absorbing harmful ultraviolet (UV) radiation from the sun. When the ozone layer is depleted, more UV radiation reaches the Earth's surface, posing risks to human health and ecosystems. The fact that the ozone hole over Ireland and the UK has almost filled demonstrates the resilience of the Earth's atmospheric system and the positive outcomes that can result from environmental changes.

Photographers and sky enthusiasts were treated to captivating views of the PSC Encore. Tom Lowe, for instance, captured stunning images of the nacreous clouds near St. Mary's Island in Northumberland, UK, and Goole in East Yorkshire, England. These photographs showcase the beauty and ethereal nature of these rare atmospheric phenomena.

As we reflect on the PSC Encore and its impact on the ozone layer, it serves as a reminder of the interconnectedness of Earth's systems. The occurrence of nacreous clouds and their interaction with the ozone layer highlight the delicate balance within our atmosphere. Understanding these phenomena and their implications is essential for monitoring and protecting our planet's environmental health.

In conclusion, the Great Ireland/UK Nacreous Cloud Episode, also known as the PSC Encore, brought about a mesmerizing display of nacreous clouds accompanied by acidic droplet clouds. While the visual spectacle was awe-inspiring, it also had significant implications for the healing of the ozone hole over the region. The occurrence of these atmospheric phenomena serves as a reminder of the intricate workings of Earth's systems and the importance of environmental monitoring and conservation efforts.

PSC Encore ~ A beautiful scene captured by Tom Lowe on 2nd February '16 at St. Mary’s Island near Whitley Bay, Northumberland, UK. Iridescent nacreous clouds of ice adorn the sky. Fainter acidic PSC Type I clouds form a backdrop. All images ©Tome Lowe, shown with permission

Stratospheric ozone concentrations on 3rd February. Blue is lower.

The ozone hole has almost filled.

From NASA Arctic Ozone Watch, GSFC

The great Ireland/UK polar stratospheric cloud episode is likely over. It lasted from 31st January until 3rd February. OPODS 1, 2, 3, 4.

Nacreous clouds of benign ice crystals shone brightly before dawn and after sunset. They were even visible in daylight.

Accompanying acid droplet clouds (quite natural PSC Type I) ate away the ozone layer over Ireland/UK. The stratosphere is now warmer. The clouds have gone. The ozone hole is almost healed.

Tom Lowe saw these nacreous clouds on 1st February near Goole, East Yorkshire, England.

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