Tree Biology Shapes Tree Ring Records of Ancient Solar Storms, Study Finds
A recent study, published in New Phytologist, indicates that tree biology plays a significant role in how accurately tree rings record evidence of ancient solar storms, known as Miyake events. Scientists have historically relied on tree rings to understand these high-energy particle bursts from the sun, which can affect satellites, power grids, and communication systems. When solar particles hit Earth's atmosphere, they create a radioactive form of carbon that trees absorb and store.
Key Findings
The study, co-authored by Northern Arizona University researchers, reviews how trees take up, store, and utilize carbon. It highlights how these biological processes influence the timing and strength of the radiocarbon "spikes" found in tree rings.
"Tree rings are not perfect instruments and that tree biology shapes the information they convey."
— Amy Hessl, Lead Author, West Virginia University
Previous observations had shown small discrepancies between different tree species, complicating the precise dating and intensity measurement of past solar events. The study explains these differences by outlining several factors:
- Trees do not instantly convert atmospheric carbon into wood; they may store it for months or even years.
- Different tree species grow at varying times of the year and in diverse climates.
- Variations exist in how trees manage their stored carbohydrates.
These biological factors can shift how radiocarbon appears within tree rings.
Implications
Understanding these biological nuances is critical for several reasons:
- It allows scientists to more accurately determine the timing and intensity of past solar storms.
- It refines estimates for the potential strength of future solar storms.
- It has implications for improving carbon dating applications in fields such as archaeology.
Mariah Carbone, an associate research professor at NAU and last author on the paper, emphasized that understanding how trees acquire, store, and use carbon for wood growth is essential for preserving the atmospheric signal faithfully.
"Understanding how trees acquire, store, and use carbon for wood growth is essential for preserving the atmospheric signal faithfully."
— Mariah Carbone, Associate Research Professor, NAU
Andrew Richardson, a Regents' professor, highlighted the interdisciplinary benefits, stating that improving the understanding of tree growth processes also enhances solar storm comprehension and radiocarbon dating methods.
This research is part of a larger National Science Foundation project investigating the intensity of past solar storms and the potential impact of similar future events on contemporary technology-dependent societies, which are vulnerable to these particle storms.