“It’s only when we put all our data together that we can look at the large scales of space and time to learn how populations of key polar species are responding to rapid climate change.”

SAM

“…One feature of global climate that appears to have an outsize impact on krill populations is the Southern Annular Mode, or SAM, a periodic north–south shift in the westerly wind belt that circles Antarctica. During positive SAM events, the wind belt contracts towards Antarctica, bringing warmer temperatures and reduced sea ice, conditions unfavorable to the survival of young krill.”

Krill range shrinks poleward with ocean warming
David Malmquist, VIMS |  January 29, 2019