Blog Post Image: Changes in Coastal Upwelling Linked to Variability in Marine Ecosystem Off California

Drops in biological productivity along the California coast (represented by fish growth rates and egg laying dates and fledgling success of seabirds) correlate with weak winter upwelling (represented here by Winter Climate, a combination of three climatic conditions associated with upwelling). Because tree ring data from blue oaks correlate well with Winter Climate, they can be used as a proxy for upwelling strength going back 600 years. Image credit: University of Texas at Austin (Click image to enlarge)