'Phytoplankton biomass: the approximately 15-year archived time series of satellite-chlorophyll  is too short to reveal trends over time and their causes' . 'Chlorophyll concentrations measured by satellites have decreased in the subtropical gyres of the North Pacific, Indian and North Atlantic oceans by 9, 12 and 11%, respectively, over and above the inherent seasonal and interannual variability from 1998 to 2010 . Significant warming over this period has resulted in increased water-column stratification, reduced mixed-layer depth and possibly decreases in nutrient availability and ecosystem productivity . The short time frame of these studies against well-established patterns of long-term variability leads to the conclusion that these changes are about as likely as not due to climate change' .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report