Newsletter Issue 20 (June 2022)

The Weather of May 2022 – A wet and cooler May

With stronger than normal northeast monsoon affecting southern China in the month, the weather of Hong Kong was much cooler than usual in May 2022. The monthly mean temperature was 25.0 degrees, 1.3 degrees below the normal figure of 26.3 degrees. Mainly attributing to the heavy rain episode on 11 – 13 May, the month was also wetter than usual with a total rainfall of 436.5 millimetres, about 50 percent above the normal of 290.6 millimetres.

WMO State of Global Climate report 2021 released

In order to unpack such complexity, the WMO State of the Global Climate uses seven Climate Indicators to describe the changing climate—providing a broad view of the climate at a global scale. They are used to monitor the domains most relevant to climate change, including the composition of the atmosphere, the energy changes that arise from the accumulation of greenhouse gases and other factors, as well as the responses of land, oceans and ice ( report.


WMO update: 50:50 chance of global temperature temporarily reaching 1.5°C threshold in next five years

There is a 50:50 chance of the annual average global temperature temporarily reaching 1.5 °C above the pre-industrial level for at least one of the next five years, according to a new climate update issued by the WMO. The chance of temporarily exceeding 1.5°C has risen steadily since 2015, when it was close to zero. For the years between 2017 and 2021, there was a 10% chance of exceedance. That probability has increased to nearly 50% for the 2022-2026 period.

‘We can do better, we must’ declares departing UN climate change chief, as COP27 looms over horizon

The annual UN Climate Change Conference in the German city of Bonn began on Monday, designed to lay the groundwork for a successful COP27, due to take place in the Egyptian coastal resort of Sharm-el-Sheikh, in November. “The world is going to have one question in Sharm- el-Sheikh: what progress have you made since Glasgow?”, UNFCCC Executive Secretary Patricia Espinosa said.

Greenhouse gas pollution trapped 49% more heat in 2021 than in 1990

NOAA’s Annual Greenhouse Gas Index (AGGI) converts the complex scientific computations of how much extra heat the heat-trapping gases (including CO2, methane, nitrous oxide, CFCs, and 16 other chemicals) capture into a single number that can easily be compared to previous years and tracks the rate of change. In 2021, the AGGI reached a value of 1.49, which means that human-emitted greenhouse gases trapped 49% more heat in the atmosphere than in 1990.

Finland sets world’s most ambitious climate target in law

Finland has passed arguably the world’s most ambitious climate target into law. It aims to be the first developed country to reach net zero, in 2035, and net negative – absorbing more CO2 than it emits – by 2040. According to Net Zero Tracker, only South Sudan has a more ambitious net zero date than 2035 and, as a developing country, its 2030 target is highly dependent on international finance.

Why the collapse of an Atlantic ocean current could mean La Niña becomes the norm

Climate change is slowing down the conveyor belt of ocean currents that brings warm water from the tropics up to the north Atlantic. A research, published in Nature Climate Change, looks at the profound consequences to global climate if this Atlantic conveyor collapses entirely. The collapse of this system would shift the Earth’s climate to a more La Niña-like state. This would mean more flooding rains over eastern Australia and worse droughts and bushfire seasons over south-west US.

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