学进去

Seafloor cables (光缆) carry over 95% of all digital data traffic worldwide, including financial trading information and social media communications. However, how the Earth’s changing climate could impact this vast undersea network has been relatively understudied until now.

In a new study published in Earth-Science Reviews, an international team of researchers led by the UK’s National Oceanography Centre(NOC) worked to illuminate this problem by assessing how and where future climate change is likely to impact subsea cables.

By analyzing published datasets, the researchers identified regional climate change “hotspots” where threats to subsea cables may become more intense. These include areas in the western Pacific where changes to tropical cyclone (热带气旋) intensity and frequency have already increased cable damage.

“In our paper, we conducted the first comprehensive assessment of a range of climate-related threats to seafloor cables across the globe and their landing stations,” says study co-author Thomas Wahl. “Our analysis clearly stresses the need to carefully plan cable routes and landing station locations factoring in a range of local threats and how those are affected by climate change.”

When we look at Florida, there are at least 21 subsea telecommunications cables that connect to the Florida coastline, North and South America and the Caribbean, meaning that there will be a breakdown in communications worldwide if a cable is damaged, the researchers say.

However, the study identifies the importance of assessing changing conditions, particularly where multiple cable systems share a landing point, as they may be affected by combinations of threats that affect the low-lying Florida coastline, such as sea level rise, and changes in storm activity. “Our reliance on cables that are no wider than a garden hose (软管) is a surprise to many, who regard satellites as the main means of communication,” says lead author Mike Clare, a researcher with NOC. “But satellites simply don’t have the bandwidth to support modern digital systems. The ‘cloud’ is not in the sky—it is under the sea.”