The disappearance of old ice in the Arctic

There is a discrepency between two different models (see below),  making it more difficult to compare previous years with current data.

This is a reply to an inquiry from Sam Carana.

Exactly, Robin! Good that you figured this out. 

I have tried to explain it many times to some other people who keep mixing up images made with different models, which causes all kinds of problems. 

Anyway, the newer model is better, so the measurements for 2018 are good, but they cannot be easily compared with some of the older measurements such as for 2012.

Cheers, 

Sam Carana

The disappearance of Arctic ice - 2012-2018

The following graph plots the decline of sea ice volume as it heads down to zero.

The following demonstrate how the ice has become thinner over the years since 2012 which saw the record low ice extent. From ice that was 2-4 meters thick it has reduced to 0.5 – 1.5 meters with a tiny slither of old,multi-year ice off to the north of Canada.

All the data is from the beginning of August, close to today's date.

2012

2013
 

 2014

 2015

Note - Beginning in 2016 the US Nay has changed its system fromn ARC to GLB. (I am unsure what this means but I have posted both)

2016

2017

 2018

P.S.  Beginning in 2016 the US Nay has changed its system fromn ARC to GLB.

This climate change denial website says it is the authorities cooking the data

“The US Navy recently made most of the Arctic sea ice disappear, using the tried and true climate science method of simply changing the data.”

It certainly makes things look very different. Certainly the ice is disappearing – the NASA satellite photos confirm that