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Dirk Dunning's avatar

Excellent analysis Richard. Everyone though is applying "conservative" analysis. No one wants to believe how bad things really are, and how fast they are getting worse. Collectively we are as a result living in denial.

This level of heating is killing the oceans. Gas laws will cause loss of oxygen as the temperatures rise. Great vortices of anoxic water will form killing everything in large areas of the oceans allowing for a shift to purple cyanobacter.

Under those conditions iron "rains" out of the ocean further depriving life of essential nutrients. H2S is emitted instead of oxygen. Slowly at first the oxygen levels of the air decline as the oceans and forests reduce oxygen production. Over a long period during the crash, this transiently reduces the atmospheric O2 levels.

If the past is prelude, it may drop to 14% during the transition, as pressure doubles. Large animals simply lie down, pass out and die from low O2, heat stress, and evapotranspiration stresses. Whole orders go extinct in a geologic blink.

Humans included - mostly. A spare few with extreme high altitude genes survive.

But that is the far future. In the near future, in our lifetimes, rising heat drives wetbulb temperatures into the lethal zone for large areas of the Earth. Parts of Pakistan, Iran, India and the desert Southwest of the US get there first. The south and southeast parts of the US soon follow due to high humidities.

By midcentury half of Texas is unsurvivable without AC. But heat stress overwhelms power production rendering AC liable to loss.

Mass population migrations away from the highest heat zones drive wars. Drought, deluge, pestilence, disease and ecosystem shifts drive all sorts of problems.

It is all going to be so exciting. And not in a good way.

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Stephen Thair's avatar

The "Anomalies in the heat content of the global ocean" graph worries me.

If I'm interpreting that correctly, since 2008 the 0-2000m heat content anomaly has been rising faster than the shallower 0-300m or 0-700m ranges.

Given that below about 1000m you're BELOW the thermocline and into the deep/abyssal ocean where the temperature is normally fairly stable at 4C, this implies that the warming has pushed down through that layer and into the deep ocean.

Which in turn has big implications for water mixing, ocean currents, sea life food chains etc.

That would seem to be bad... very, very, bad...

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