Global Warming Is Warming [Greg Laden's Blog]

The most current data from NASA GISS has come out, displaying a surprise outcome for the month of March.

Hat tip to Jeff Masters of Wunderground for sending this info. He’ll almost certainly be blogging on it soon.

The surprise is that March, whilst expected to be warm due to human triggered greenhouse gas pollution, turned out to be very warm globally. This is a surprise simply because the Earth supposedly just skilled a minor cooling La Niña occasion that ended in January. March 2017, it turns out, is the fourth warmest month since 1880 expressed as an anomaly from a 1951-1980 baseline (that’s a bit difficult, far more on that under).

Here’s the existing list of warmest months:

February 2016, 1.32°C
March 2016, 1.28°C
January 2016, 1.13°C
March 2017, 1.12°C
February 2017, 1.10°C
December 2015, 1.10°C

The key issue to notice here is all these years getting quite extremely recent.

The ranking of months is on a month by month basis. In other words, Feb 2016 is not necessarily the warmest month of all the months over 120 years. Rather, it is the warmest of all the Februaries over this period of time. This may possibly appear like a strange way to do it, but it really makes sense. Even even though these are worldwide values and therefore integrate northern and southern seasons, there is a possible for intra-annual variation in worldwide temperatures, for a number of factors (which includes the uneven distribution of land and ocean amongst the northern and southern hemispheres). For this and other even a lot more esoteric factors having to do with how to track anomalies, we examine months to months (Januaries to Januaries, Februaries to Februaries, and so forth.).

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