WMO Statement: The State of the Global Climate in 2019
The World Meteorological Organization (WMO) Statement on the State of the Climate in 2019 was released on 10 March. The report includes input from national meteorological and hydrological services, leading international experts, scientific institutions and United Nations agencies.
Some of the key messages contained in the statement are as follows.
- The global mean temperature for 2019 was 1.1±0.1 °C above pre-industrial levels, with this year likely to have been the second warmest in instrumental records.
- Global atmospheric mole fractions of greenhouse gases (CO2, CH4 and N2O) reached record levels in 2018 and early indications show that the rise in all these gases continued in 2019.
- The year 2019 saw low sea-ice extent in both the Arctic and the Antarctic.
- Ocean heat content, which is a measure of the heat accumulation, reached record-high levels in 2019.
- In 2019, the global mean sea level reached its highest value since the beginning of the high-precision altimetry record (January 1993).
- Observations from open-ocean sources over the last 20 to 30 years show a clear decrease in average pH at a rate of 0.017–0.027 pH units per decade since the late 1980s.
As well as providing information about global climate indicators associated with the temperature, greenhouse gases and ozone, ocean and cryosphere, the WMO Statement also:
- Describes high-impact weather events in 2019 (e.g. heat and cold waves, heavy rainfall and floods, droughts and wildfires).
- Considers the climate-related risks associated with health, food security and population displacement, and marine life and biodiversity.