Snow Falls Red explores the intriguing phenomenon of “blood snow” or “watermelon snow,” where normally pristine white snow turns vivid shades of red and pink. This increasingly common sight in Arctic and alpine regions is caused by cold-adapted algae, specifically Chlamydomonas nivalis, which possess red carotenoid pigments protecting them from intense UV radiation. These pigments, while visually captivating, reduce the snow's albedo effect, accelerating snowmelt and potentially impacting water resources.
The book examines the biology and ecology of these snow algae and how climate change influences their spread. It argues that the increasing prevalence of colored snow directly results from climate change, creating a feedback loop that worsens warming in vulnerable areas. The book progresses from introducing snow algae and their adaptations to exploring environmental factors influencing algal blooms, consequences of colored snow on ecosystems, and broader climate change implications.
Drawing from microbiology, ecology, and climatology, Snow Falls Red presents field studies, lab experiments, and satellite imagery. By connecting microscopic organisms to global climate patterns, the book offers a comprehensive perspective, highlighting the urgency of further investigation and proactive solutions for this increasingly concerning issue.
