NOAA released its 2011 Arctic report card. And then they confused the metaphors by using a traffic signal. *Sigh.*
But if we follow through on the original metaphor, we get the following report card:
The foremost conclusion of the report is that 2006 marked a major shift in the Arctic Ocean system.
The report doesn't say 'tipping point.' But in fact it might well have been a tipping point. Here's what this tippinglike point looks like:
The tipping-ish part is that the system may not return to what it was before 2006. In other words, another new normal.
For marine life, most consequences are a response to ever-smaller areas of ice and ever-larger areas of open water. Specifically:
Many of the changes underway for terrestrial life are linked to warmer temperatures in coastal regions, where sea ice used to keep things cool, but is now in retreat. Including:
A second key point from this report card is the repeat in 2011 of an anomalous wind pattern that first appeared in the Arctic winter of 2010. This weakening of the Arctic vortex led to the jet stream dipping south and warming Greenland and northeastern Canada, while bringing much colder temperatures to Europe and North America. The results:
On top of all that, the Arctic grew its own bona fide ozone hole last winter—one that threatens far more populated areas of the globe than the Antarctic hole, and one with the power to impact the winter crops that feed us. The executive summary of the report concludes:
The 2011 Report Card shows that record-setting changes are occurring throughout the Arctic environmental system. Given the projection of continued global warming, it is very likely that major Arctic changes will continue in years to come, with increasing climatic, biological and social impacts.