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Why Were 2023 and 2024 So Hot?

Union of Concerned Scientists

The year 2023 was by far the warmest in Earths recorded history, and perhaps in the past 100,000 years , shattering the previous record set in 2016 by 0.27C (0.49F). In that year, El Nio added to the increased warming caused by the build-up of heat-trapping emissions in the atmosphere, leading to that record-breaking heat.

2024 284
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WMO: Update on 2023/4 Anomalies

Real Climate

since the 1850-1900 baseline is very clearly associated with the increases in greenhouse gases, slightly (and decreasingly) modulated by the changes in atmospheric pollution. Dessler, "Evolution of the Climate Forcing During the Two Years After the Hunga TongaHunga Ha'apai Eruption", Journal of Geophysical Research: Atmospheres , vol.

2023 189
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The definitive CO2/CH4 comparison post

Real Climate

The radiative forcing from these changes in concentrations can be easily calculated using standard formulas (from Etminan et al, 2016 which supersede the slightly simpler ones from IPCC TAR), as about 2 W/m 2 for the CO 2 change and 0.65 W/m 2 for CH 4. W/m<sup>2</sup> (to about 60% of the CO 2 effect since 1750). References.

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New misguided interpretations of the greenhouse effect from William Kininmonth

Real Climate

He made some rather strange claims, such as that the Intergovernmental Panel on Climate Change (IPCC) allegedly should have forgotten that the earth is a sphere because “ most absorption of solar radiation takes place over the tropics, while there is excess emission of longwave radiation to space over higher latitudes ”. 679-688, 2016.

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AR6 of the best

Real Climate

Now however, the updates to the historical warming , the use of four datasets instead of one, and of course, the series of record breaking years subsequently (2014, 2015, 2016/2020), the issue of variability in decadal trends is no longer so salient. 1981) which can be seen here. The radiative forcing bar chart now converted to temperature.

Sea Level 361
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A distraction due to errors, misunderstanding and misguided Norwegian statistics

Real Climate

are used all over the world, based on calculations that quantify the effects of physical mechanisms and the way different parts of the atmosphere are connected to each other. The physics-based models describe how energy flows through the atmosphere and ocean, as well as how the forces from different air masses push against each other.

Sea Level 326
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A Total Eclipse of the Heat

Legal Planet

I hope we can collectively reckon with another terrifyingly awesome atmospheric event: the hottest year. C hotter than the second-hottest year to date, 2016. Multiple relentless heat waves occurred in 2023 , with much of the globe experiencing 20 more “heatwave days” than in the previous three decades.