The coastal waters of Northern California are changing. A decade ago, hundreds of miles of the rugged seaside were flanked by thick, swaying underwater forests of amber-green bull kelp that were home to fish, abalone and a host of other species. Now, those forests have been nearly wiped out by a series of environmental events that have been falling like ill-fated dominos since 2013. A new study using satellite imagery and underwater surveys is the latest to confirm that these majestic marine ecosystems have all but disappeared, reports Tara Duggan for the San Francisco Chronicle. Satellite images dating back to 1985 show that bull kelp forests off Sonoma and Mendocino counties have declined by a devastating 95 percent since 2013, and, according to the Chronicle, researchers are concerned the kelp may not be able to bounce back anytime soon. - Smithsonian
A growing body of evidence suggests that a massive change is underway in the sensitive circulation system of the Atlantic Ocean, a group of scientists said Thursday. The Atlantic meridional overturning circulation (AMOC), a system of currents that includes the Florida Current and the Gulf Stream, is now “in its weakest state in over a millennium,” these experts say. This has implications for everything from the climate of Europe to the rates of sea-level rise along the U.S. East Coast. Although evidence of the system’s weakening has been published before, the new research cites 11 sources of “proxy” evidence of the circulation’s strength, including clues hidden in seafloor mud as well as patterns of ocean temperatures. The enormous flow has been directly measured only since 2004, too short a period to definitively establish a trend, which makes these indirect measures critical for understanding its behavior. - Washington Post
I started a CGCC Facebook page in May of '20 to share geo-environmental news but had concerns about FB's issues with accuracy. This page, GeoNews, is a response and partial solution, sharing a few items from reliable sources each week.