Unprecedented Temperature Anomalies in 2023 — Hottest 12 months On Document



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The Copernicus Local weather Change Service (C3S), applied by the European Centre for Medium-Vary Climate Forecasts on behalf of the European Fee with funding from the EU, routinely publishes month-to-month local weather bulletins reporting on the adjustments noticed in international floor air temperature, sea ice cowl and hydrological variables. All of the reported findings are based mostly on computer-generated analyses utilizing billions of measurements from satellites, ships, plane and climate stations all over the world.

September 2023 — Floor air temperature and sea floor temperature highlights:

September 2023 was the warmest September on file globally, with a mean floor air temperature of 16.38°C, 0.93°C above the 1991–2020 common for September and 0.5°C above the temperature of the earlier warmest September, in 2020.
September 2023 international temperature was probably the most anomalous heat month of any yr within the ERA5 dataset (again to 1940).
The month as a complete was round 1.75°C hotter than the September common for 1850–1900, the preindustrial reference interval.
The worldwide temperature for January–September 2023 was 0.52°C increased than common, and 0.05°C increased than the equal interval within the warmest calendar yr (2016).
For January to September 2023, the worldwide imply temperature for 2023 so far is 1.40°C increased than the preindustrial common (1850–1900).
For Europe, September 2023 was the warmest September on file, at 2.51°C increased than the 1991–2020 common, and 1.1°C increased than 2020, the earlier warmest September.
The common sea floor temperature for September over 60°S–60°N reached 20.92°C, the very best on file for September and the second highest throughout all months, behind August 2023.
El Niño situations continued to develop over the equatorial japanese Pacific.

 International every day floor air temperature (°C) from 1 January 1940 to 30 September 2023, plotted as time sequence for annually. 2023 and 2016 are proven with thick traces shaded in shiny purple and darkish purple, respectively. Different years are proven with skinny traces and shaded in accordance with the last decade, from blue (Nineteen Forties) to brick purple (2020s). The dotted line and gray envelope signify the 1.5°C threshold above preindustrial stage (1850–1900) and its uncertainty. Data supply: ERA5. Credit score: Copernicus Local weather Change Service/ECMWF.

In response to Samantha Burgess, Deputy Director of the Copernicus Local weather Change Service (C3S): “The unprecedented temperatures for the time of yr noticed in September — following a file summer season — have damaged information by a unprecedented quantity. This excessive month has pushed 2023 into the doubtful honour of first place – on monitor to be the warmest yr and round 1.4°C above preindustrial common temperatures. Two months out from COP28 — the sense of urgency for bold local weather motion has by no means been extra important.”

September 2023 — Sea Ice Highlights

Antarctic sea ice extent remained at a file low stage for the time of yr.
Each the every day and month-to-month extents reached their lowest annual maxima within the satellite tv for pc file in September, with the month-to-month extent 9% under common.
The every day Arctic Sea ice extent reached its sixth lowest annual minimal whereas the month-to-month sea ice extent ranked fifth lowest, at 18% under common.

Every day Antarctic sea ice extent from 1979 to September 2023. Shades of blue are used for years as much as 1999, and shades of purple
from 2000 onward. The yr 2023 is proven with a thick black line, the yr 2022 with a thick purple line, and the median for 1991–2020 with a dashed gray line. Data supply: EUMETSAT OSI SAF Sea Ice Index v2.2. Credit score: Copernicus Local weather Change Service/ECMWF/EUMETSAT.

September 2023 — Hydrological variables highlights:

September 2023 noticed wetter-than-average situations alongside many elements of the western seaboard of Europe, together with the western Iberian Peninsula, Eire, northern Britain, and Scandinavia.
It was additionally wetter than common in Greece following excessive rainfall related to storm Daniel; this occasion was additionally answerable for the devastating flooding in Libya.
Southern Brazil and southern Chile additionally skilled excessive precipitation occasions.
Drier-than-average areas included elements of Europe, the southeastern USA, Mexico, central Asia, and Australia, the place the driest September on file was recorded.

Solutions to ceaselessly requested questions concerning temperature monitoring might be discovered right here.

The findings about international sea floor temperatures (SSTs) offered listed below are based mostly on SST information from ERA5 averaged over the 60°S–60°N area.

Be aware that ERA5 SSTs are estimates of the ocean temperature at about 10m depth (often known as basis temperature). The outcomes could differ from different SST merchandise offering temperature estimates at totally different depths, similar to 20cm depth for NOAA’s OISST.

Details about the C3S information set and the way it’s compiled:

Temperature and hydrological maps and information are from ECMWF Copernicus Local weather Change Service’s ERA5 dataset.

Sea ice maps and information are from a mixture of knowledge from ERA5, in addition to from the EUMETSAT OSI SAF Sea Ice Index v2.1, Sea Ice Focus CDR/ICDR v2 and fast-track information offered upon request by OSI SAF.

Regional space averages quoted listed below are the next longitude/latitude bounds:

Globe, 180W–180E, 90S–90N, over land and ocean surfaces.
Europe, 25W–40E, 34N–72N, over land surfaces solely.

Extra details about the information might be discovered right here.

Article courtesy of the Copernicus Local weather Change Service.


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