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Water and climate change  B.Y. Lee Director of the Hong Kong Observatory May 2010
Global warming  :  “ Most of the observed increase in globally-averaged temperatures since the mid-20th century is very likely due to the observed increase in man-made greenhouse-gas (GHG) concentrations”   ( United Nations Intergovernmental Panel on Climate Change (IPCC),  Fourth Assessment Report  (AR4), 2007) Very likely = 90%
About  10% increase relative to the 1980-1999 average of 2324 mm   About 5% or 120mm less than the 1980-1999 average
香港極 端少雨 和極 端多 雨的年數 Number of extremely dry years and extremely wet years in Hong Kong ( 相片來源:水務署   Photo from Water Supplies Department ) ( 相片來源:水務署   Photo from Water Supplies Department ) ( 相片來源:水務署   Photo from Water Supplies Department ) ( 相片來源:水務署   Photo from Water Supplies Department ) ( 相片來源:水務署   Photo from Water Supplies Department ) ( 相片來源:水務署   Photo from Water Supplies Department ) 期間 Period 10  4  21 st  century 2   2 1885 - 200 0 極端多雨的年數   Extremely wet years 極端少雨的年數   Extremely dry years ( 相片來源:水務署   Photo from Water Supplies Department ) ( 相片來源:渠務署  Photo from Drainage Services Department ) Notes : Extremely dry years - annual rainfall less than 1282 mm; extremely wet years - annual rainfall more than 3187 mm 極端少雨的年數  -  年雨量低於 1282 毫米 ;  極端多雨的年數  -  年雨量高於 3187 毫米 ( 相片來源:渠務署  Photo from Drainage Services Department )
Personally per capita 100 litres/day Daily food consumption  2000-5000 litres 1 kg bolt of cloth >10 000 litres 1 kg of beef 15 000 litres 1 kg of vegetable  2000 litres Water usage (source : The Economist, 11 April 2009)
What about the melting glaciers in the Himalayas? ,[object Object],[object Object],[object Object],[object Object],Source : World Glacier Monitoring Service : Preliminary glacier mass balance data 2007/2008 http://www.geo.unizh.ch/wgms/mbb/sum08.html)
Flooding of the coastal areas becomes  easier  under tropical cyclone situations Sea level rise, plus storm surge waves caused by typhoon r i se in sea level coast coast
Magnitude of extreme sea levels at Victoria Harbour  based on past data, a projected rise of 0.59 m and of 1.4 m. Note: mCD = metres above Chart Datum. Chart Datum is 0.146 metre below Principal Datum. 4.9 4.1 3.5 50 4.8 4.0 3.4 20 4.7 3.8 3.3 10 4.5 3.7 3.1 5 4.3 3.5 2.9 2 Extreme sea-level (mCD) after a mean of sea-level rise of 1.4 m Extreme sea-level (mCD) after a mean of sea-level rise of 0.59 m Extreme sea-level (mCD) based on past data Return period (year) Extreme sea-levels at Victoria Harbour
(courtesy of  TVB )  F looding in Tai O  after Typhoon Hagupit   (September 2008)

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City Speak XII - Water We Drink: BY Lee of HKO

  • 1. Water and climate change B.Y. Lee Director of the Hong Kong Observatory May 2010
  • 2. Global warming : “ Most of the observed increase in globally-averaged temperatures since the mid-20th century is very likely due to the observed increase in man-made greenhouse-gas (GHG) concentrations” ( United Nations Intergovernmental Panel on Climate Change (IPCC), Fourth Assessment Report (AR4), 2007) Very likely = 90%
  • 3. About 10% increase relative to the 1980-1999 average of 2324 mm About 5% or 120mm less than the 1980-1999 average
  • 4. 香港極 端少雨 和極 端多 雨的年數 Number of extremely dry years and extremely wet years in Hong Kong ( 相片來源:水務署 Photo from Water Supplies Department ) ( 相片來源:水務署 Photo from Water Supplies Department ) ( 相片來源:水務署 Photo from Water Supplies Department ) ( 相片來源:水務署 Photo from Water Supplies Department ) ( 相片來源:水務署 Photo from Water Supplies Department ) ( 相片來源:水務署 Photo from Water Supplies Department ) 期間 Period 10 4 21 st century 2 2 1885 - 200 0 極端多雨的年數 Extremely wet years 極端少雨的年數 Extremely dry years ( 相片來源:水務署 Photo from Water Supplies Department ) ( 相片來源:渠務署 Photo from Drainage Services Department ) Notes : Extremely dry years - annual rainfall less than 1282 mm; extremely wet years - annual rainfall more than 3187 mm 極端少雨的年數 - 年雨量低於 1282 毫米 ; 極端多雨的年數 - 年雨量高於 3187 毫米 ( 相片來源:渠務署 Photo from Drainage Services Department )
  • 5. Personally per capita 100 litres/day Daily food consumption 2000-5000 litres 1 kg bolt of cloth >10 000 litres 1 kg of beef 15 000 litres 1 kg of vegetable 2000 litres Water usage (source : The Economist, 11 April 2009)
  • 6.
  • 7. Flooding of the coastal areas becomes easier under tropical cyclone situations Sea level rise, plus storm surge waves caused by typhoon r i se in sea level coast coast
  • 8. Magnitude of extreme sea levels at Victoria Harbour based on past data, a projected rise of 0.59 m and of 1.4 m. Note: mCD = metres above Chart Datum. Chart Datum is 0.146 metre below Principal Datum. 4.9 4.1 3.5 50 4.8 4.0 3.4 20 4.7 3.8 3.3 10 4.5 3.7 3.1 5 4.3 3.5 2.9 2 Extreme sea-level (mCD) after a mean of sea-level rise of 1.4 m Extreme sea-level (mCD) after a mean of sea-level rise of 0.59 m Extreme sea-level (mCD) based on past data Return period (year) Extreme sea-levels at Victoria Harbour
  • 9. (courtesy of TVB ) F looding in Tai O after Typhoon Hagupit (September 2008)