chubbs

There are many factors contributing to the warming spike this year. An additional one is the east-based pattern of this nino. Below is a slide from a recent talk by climate scientist Tim Andrews. Warming in the east Pacific produces stronger positive feedbacks than warming in the west Pacific. We've had an unusually large temperature swing this year in the far EPac, even for a nino onset year. Below is the bottom-line from the talk. Some of increased warming anticipated below has already occurred courtesy of the 2015+2023 ninos. https://github.com/timothyandrews/cfmip2023/blob/main/Andrews_CFMIP_Jul2023.pdf

The last point is the July average to date. Continuing to get an unusually large SST rise in this nino.

This chart updates re-analysis estimates for July and adds era5

Per this blog, this summer's global temperatures aren't surprising. Would be interesting to see where they stack-up vs cmip5. https://www.theclimatebrink.com/p/are-temperatures-this-summer-hotter

Preliminary re-analysis estimates for July

Barbie says don't blame UHI or thermometers next to AC units

Thanks for your model predictions. I wouldn't be surprised if temps end up even higher. SST continues to move further into record territory and may separate further from the pack if nino conditions continue to build.

Concerning, seems to be increasing faster than I would have expected based on ocean heat content or net man-made forcing info. Hopefully we will get an update of the paper below which found reasonable agreement between Ceres to ocean heat content (Planetary Heat Uptake) through 2019. In any case we are due for a short-term reversal of recent spike. Will be interesting to see what the summer data says given the run of record temperatures. https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL093047

Yes that's the $64 question. Here is a longer view of the daily CFS re-analysis anomalies. There is an annual cycle with smaller anomalies in the summer. This year's summer anomaly spikes are unusual, sending the blue 91-day mean well above previous summers. Like you say, the next few months are key in evaluating where stand. Hopefully the rise this summer has borrowed from the rise typically seen in the fall of developing nino. We'll see.

Looks like GISS lowered some of the monthly values in 2016 and 2020, now 1.01 is the record instead of 1.02. Since Kalshi defines a record as 1.03, possible to break the record and not get paid.

Unfortunately the x (and y) axes don't align below, so the dates don't match. There is evidence of a see-saw with arctic and antarctic moving in opposite directions. The ocean overturning circulation driven by sea ice formation is a potential see-saw link. Increasing fluctuation is a sign of tipping point behavior. Just speculation of course.

June GISS will be 1.11 if it breaks last years record by the same amount as Berkeley Earth.

A couple of recent estimates of impact of marine sulfur rules which took effect in 2020. Bottom line - not significant on a global-scale, roughly 1 year at current global warming rate of roughly 0.2C per decade. More significant though on a regional basis. Not the main cause of the recent spate of daily records, https://www.carbonbrief.org/analysis-how-low-sulphur-shipping-rules-are-affecting-global-warming/

Another "warmest day ever" yesterday on CFS. Could be the peak, per Hausteins site, but the fall doesn't look to severe. More significant than the "warmest day ever" is the prolonged period of daily records since early June and the margin over previous years. A sign that this nino could send global temps well beyond 2016.

As expected, ERA also ticked higher on the 4'th

Big melt and runoff event forecast for Greenland the first week of July. The melt season started very slowly this year; but, has ramped in the past week as NAO+--->NAO-. Melt and run-off are forecast to reach record levels by the end of the week. We'll see. https://www.climato.uliege.be/cms/c_5652668/fr/climato-greenland

Very warm (and stable recently) forecast by gfs for first week of July. Pushing daily reanalysis temperatures further into record-breaking territory. Could break the 17C barrier on the chart posted above.

Not sure what the effect is. It isn't preventing daily re-analysis records. Any cooling effect from the Canadian fires should peak in northern hemi summer and end by late fall.

Think the odds will only increase as the year progresses. We started in an enso hole this year after 3 years of nina, but the transition to nino has been rapid. June is on track to be the warmest ever(note - SST below, global re-analysis temps for June also in record territory). Expect most of the remaining months this year to also break records.

This chart, based on ERA5, provides a clearer day-by-day comparison of 2023 vs the previous record holders. Flip to nino occurred early enough in year to allow a record. We'll see if recent warming is maintained or there is a fall back to temps closer to 2016 and 2020. https://climate.copernicus.eu/tracking-breaches-150c-global-warming-threshold?utm_source=tw&utm_medium=socialmedia&utm_campaign=globalwarminglimit-june23

Per this chart, Honga Tonga had a net cooling effect but it is fading rapidly. The cooling effect was a bigger peturbation than marine SOx at its peak. https://github.com/ClimateIndicator/forcing-timeseries/tree/main/plots

Agree with this. GHG are the problem. The oceans and aerosols are holding temperatures in check, but you can't count on either for the long term. Need to be careful about over-interpreting month-to-month temperature swings. The marine sulfur rules had a very short-term impact. The aerosols disappeared in a week or two in early 2020. El nino is going to have a much larger impact on this years temperatures than marine sulfur. As you say though some of this years early warmth is probably due to other causes. In any case, temperature records in years that transitioned to el nino are not that unusual: 86, 97, 02, 09 and 14 all set records.

CFS re-analysis temps are toasty this month. Roughly 3-months after daily satellite SST spiked to record territory in March. Since March, daily SST have moved further into record territory. Will temperatures lag SST and stay elevated?