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Monthly Northern Hemisphere Land Temperature Anomaly

Temperatures have been rising fast in March 2023. The image below shows the Monthly Northern Hemisphere Land Temperature Anomaly up to March 2023, with two trends added. The blue trend, based on Jan.1850-Mar.2023 NOAA data, points at a 3°C rise in 2032.

The magenta trend, based on Oct.2010-Mar.2023 NOAA data, better reflects variables such as El Niño and sunspots, and illustrates how they could trigger a rise of more than 5°C in 2026. Anomalies are versus 1901-2000 (not versus pre-industrial). 

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Could it be possible for the temperature to keep following the magenta trend? Let's have a look at how dire the situation is. 

Greenhouse gas concentrations keep rising 

Reducing emissions is the right thing to do, even though it comes with loss of the aerosol masking effect, a loss that causes a rise in temperatures, as discussed in an earlier post. Yet, despite pledges by politicians, greenhouse gas concentrations in the atmosphere keep rising, as discussed earlier such as this in this post.

CO2 April 15 2023
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Carbon dioxide (CO₂) at Mauna Loa, was 424.3 ppm on April 15, 2023, a record high.

Average CO₂ was 422.89 ppm for the week beginning April 09, 2023, also a record high for (weekly) in situ measurements at Mauna Loa, Hawaii.

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Crucially, methane emissions should be cut. The Clouds Tipping Point, at 1200 ppm CO₂e, could be crossed as early as in 2027 due to forcing caused by the rise in methane alone, and crossing this tipping point on its own could result in a further rise of 8°C. When further forcing than the forcing just from methane is taken into account, this could happen even earlier than in 2027. 

El Niño and further variables

Meanwhile, we're moving into an El Niño, as illustrated by the image on the right, adapted from NOAA.

Moving from the bottom of a La Niña to the peak of a strong El Niño could make a difference of more than half a degree Celsius, as illustrated by the images below, adapted from NOAAEl Nino April 10 2023

The difference in temperature between November 2022 and March 2023 already is about half a degree Celsius and we are not even in an El Niño yet. 

enso bars.195001.202303
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As illustrated by the image below, the difference in temperature between November 2022 and March 2023 already is about half a degree Celsius and we are not even in an El Niño yet.
El Nino 2
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El Niño is expected to reach its full strength over the next few years, with a maximum possibly in 2026. 

Furthermore, sunspots look set to reach a high maximum within years, and the 2022 Tonga submarine volcano eruption did add a huge amount of water vapor to the atmosphere, as discussed in an earlier post

Ocean heat, feedbacks and tipping points 

The sea surface temperature between 60°South and 60°North has been above 21°C for a while, something that hasn't happened before in the NOAA record that started in 1981, as illustrated by the image below.

Surface Temp April 15 2023
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Vast amounts of ocean heat are moving toward the Arctic. With further melting of sea ice and thawing of permafrost, the Arctic Ocean can be expected to receive more heat over the next few years, i.e. more heat from direct sunlight, more heat from rivers, more heat from heatwaves and more ocean heat from the Atlantic Ocean and the Pacific Ocean. 

Last year, North Atlantic sea surface temperatures reached a record high of 24.9°C in early September. The continuing rise of ocean heat threatens to trigger massive loss of sea ice (and loss of albedo) and eruptions of methane from the seafloor of the Arctic Ocean, as has been described many times before, such as in this post, in this post and in this post.

NH ocean temperature
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The above image illustrates the danger of two tipping points getting crossed, i.e. the Latent Heat Tipping Point and the Seafloor Methane Tipping Point.



 This threatens to cause rapid destabilization of methane hydrates at the seafloor of the Arctic Ocean leading to explosive eruptions of methane, as its volume increases 160 to 180-fold when leaving the hydrates, as illustrated by the above image.


A huge temperature rise thus threatens to unfold over the next few years, as illustrated by the image on the right. Altogethpotential-rise.pnger, the rise from pre-industrial to 2026 could be more than 18.44°C, potentially as early as in 2026. 

Meanwhile, humans are likely to go extinct with a rise of 3°C and most life on Earth will disappear with a 5°C rise, as illustrated by the image below, from an analysis discussed in an earlier post

This situation calls for urgent action. Reducing emissions alone won't be enough. Carbon also needs to be removed from the atmosphere and oceans, through re-/afforestation, through pyrolysis of biowaste with the resulting biochar (and nutrients) returned to the soil and further methods. Even with a rapid transition to clean, renewable energy, with changes to food, land use, construction and waste management, and with removal of large amounts of carbon from the atmosphere and oceans, still more action is needed.

Extinct 650x140 new

Marine Cloud Brightening is a good idea, while many further methods may first need more surplus clean energy to be available and/or require more R&D.

Whether action will happen successfully and rapidly enough is indeed a good question, but that question shouldn't be used as an excuse to delay such action, since taking such action simply is the right thing to do. Accordingly, everyone is encouraged to support and share action as described at this Climate Emergency Declaration


• NOAA - Monthly Northern Hemisphere Land Temperature Anomaly 

• NOAA - Recent Daily Average Mauna Loa CO2


• NOAA - Weekly average CO2 at Mauna Loa

• Climate Reanalyzer - Daily sea surface temperatures

• Sea surface temperature at record high

• Dire situation gets even more dire
• NOAA - Climate Prediction Center - ENSO: Recent Evolution, Current Status and Predictions

• Climate Emergency Declaration