Preliminary data shows hottest week on record. Unprecedented sea surface temperatures and Antarctic sea ice loss

Postée le 10 juil. 2023 à 18h 14min

The world just had the hottest week on record, according to preliminary data. It follows the hottest June on record, with unprecedented sea surface temperatures and record low Antarctic sea ice extent.
The record-breaking temperatures on land and in the ocean have potentially devastating impacts on ecosystems and the environment. They highlight the far-reaching changes taking place in Earth’s system as a result of human-induced climate change.
“The exceptional warmth in June and at the start of July occurred at the onset of the development of El Niño, which is expected to further fuel the heat both on land and in the oceans and lead to more extreme temperatures and marine heatwaves,” said Prof. Christopher Hewitt, WMO Director of Climate Services.
“We are in uncharted territory and we can expect more records to fall as El Niño develops further and these impacts will extend into 2024,” he said. “This is worrying news for the planet,” he said.
According to provisional analysis based on reanalysis data from Japan named JRA-3Q, the average global temperature on 7 July was 17.24 degrees Celsius. This is 0.3°C above the previous record of 16.94 °C on 16 August 2016 – a strong El Niño year.
The Japanese reanalysis data was made available to WMO and is not yet confirmed. But it is consistent with preliminary data from the Copernicus ECMWF ERA5 dataset.
Comparisons of daily global mean temperature are typically only available from combining observations from satellites etc with computer model simulations, into datasets called reanalyses. WMO uses a combination of reanalysis datasets with global observations from land surface stations and ships for its State of the Climate reports and to assess global temperatures.
« According to various datasets from our partners in different parts of the world, the first week of July set a new record in terms of daily temperatures,” said Dr Omar Baddour, chief of climate monitoring at WMO. “The WMO and wider scientific community are closely watching these dramatic changes in different components of the climate system, and sea surface temperatures,” he told a media briefing.

  Hottest June
report from the European Union’s Copernicus Climate Change Service – a close  collaborator with the World Meteorological Organization – showed that June 2023  was just over 0.5°C above the 1991-2020 average, smashing the previous record of June 2019.