Arctic melt season changes and the Arctic regime shift

Watts Up With That?

By Javier

In sharp contrast with previous decades, the past 10 years have seen no change in Northern Hemisphere average sea ice extent, according to MASIE (may-zee, Multi-sensor Analyzed Sea Ice Extent) database from the National Sea & Ice Data Center (NSIDC; see figure 1).

Figure 1. MASIE sea-ice extent data for the Northern Hemisphere showing essentially no trend for Arctic sea-ice for the past 11 years.

Based on fundamental climate observations and research it has been proposed by several scientists that the Arctic might have entered a new regime with its most conspicuous consequence a reduction or even inversion of recent Arctic sea ice trends. So far, the data appears to support their interpretation. They are Miles et al. 2014, Wyatt & Curry 2014, and Årthun et al. 2017 (references in the appendix).

Last October I presented some of the evidence at WUWT here.

Despite…

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