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climate change

Climate Projections for Hong Kong

<<Rainfall

Mean sea level

Wet-bulb temperature>>

Under the high greenhouse gas concentration scenario, the annual mean sea level in Hong Kong and its adjacent waters in 2081-2100 are expected to rise by 0.63 - 1.07 m relative to the average of 1986-2005.

Projected changes in the mean sea level in Hong Kong and its adjacent waters

Projected changes in the mean sea level in Hong Kong and its adjacent waters relative to the average of 1986-2005 under the high (red) and medium-low (orange) greenhouse gas concentration scenarios (solid line plots the mean value while dashed lines show the likely range of projection results). Historical observations are shown in black.


With an expected rise in mean sea level in Hong Kong and its adjacent waters by 1.07 m by the end of the 21st century under the high greenhouse gas concentration scenario, the threat of storm surges brought by tropical cyclones will correspondingly increase (see diagrams below).

storm surges

A water height of 3.5 m that can cause serious flooding in low-lying areas in Hong Kong, such as the one brought by Typhoon Hagupit in 2008, may become a recurrent event every year by the end of this century. The situation could be even worse as the global mean tropical cyclone intensity is likely to increase.

 

» Climate projections under different greenhouse gas concentration scenarios