This article is offered by Jonathan Drake. It discusses the unusual changes in trend noted in sea ice at various points of the historic record paying particular attention to the satellite data. I think it is worth posting, but I have varied opinions and questions regarding the different sea ice datasets displayed here. To me it could be characterized as ‘unusual trends’, as something is certainly up in the longer term combination of data.
Rather than reformat the PDF, I have uploaded it here: Could Instrumentation Drift Account for Arctic Sea Ice Decline: