Climate change

When historical weather data from the middle of the 20th century is compared with recent weather data we observe a 19% decrease in rainfall and a 1oC increase in temperature. More weather data needs to be collected in order to establish a real trend especially related to the decrease in rainfall. That is because we only have 5-10 years of current weather data. However the long term analysis of rainfall in Dili with a relatively complete set of data shows a decline in rainfall over the last 50 years. This trend is also supported by the most recent report of the International Panel for Climate Change which we refer to as IPCC5. For more information on how the climate has changed from the past up to the present please refer to our document:

Climate Change Research in Timor-Leste Summary Release 2013

IPCC release a report about every 5 years. A number of different organisations use the data developed by IPCC to produce modelled climate data for the globe. At Seeds of Life, we have downloaded and analysed data modelled by CSIRO for the region of Timor-Leste. The data is free and the analysis is performed using free programs such as DIVA-GIS and QGIS. The IPCC5 predictions can be compared to a baseline model called Worldclim which models the rainfall and temperature based on data from 1960-2000.

By 2050, the temperature is expected to increase by 1.3oC and the total annual rainfall is expected to decrease by 12%. Predicted changes are not uniform across the country. Suco specific information on climate change can be found on our Suco Information Sheets. During the cropping season, many farmers do not generally experience a shortage of water for their crops although dry periods of 2-3 weeks during the wet season can lead to some wilting of maize. In the future there may be more dry periods like this. Increasing organic matter in the soil and leaving a mulch cover will greatly improve the soil moisture level during dry periods. We recommend intercropping velvet bean with maize to increase soil organic matter. Recent research indicates that increased temperatures may lead to a reduction in maize yields in warmer climates along the coast. However, temperature increases will lead to increased yields at higher altitudes for farmers who do not take any measures to improve soil fertility.

Farmers in Timor-Leste can greatly improve maize yields by:

  • using improved and locally tested varieties such as Sele
  • aiming for 4-6 plants per square metre
  • improving fences
  • intercropping velvet bean (Lehe)
  • leaving a mulch cover (not burning off organic matter)
  • terracing or contour planting on slopes
  • testing soil and addressing deficiencies

By following these recommendations, farmers can build resilience for climate change.

The impact of climate change on the ENSO cycle (El Nino and La Nina) is still uncertain. It is known that during El Nino rainfall will decrease on average by 17% and during La Nina it will increase by 19%. So if a community can improve resilience to current climate variability caused by ENSO then they will be much better placed to cope with climate change in the future.

It is difficult to determine if extreme weather events will be more frequent or intense. However, the climate in Timor-Leste is known to have quite extreme weather – high winds, heavy downpours and extended dry seasons. It is important that organisations are familiar with the sort of extreme weather that can occur in their particular area. We recommend you refer to data in our climate and weather section such as the “Santiga File” which will indicate how extreme the rainfall can be compared to recent years. The National Directorate of Meteorology and Geophysics (DNMG) have also recently digitised around 20 years of daily historical weather data from 1954 until 1974.

Summary of climate change
 Period Current 2050 Change
 Annual rainfall 1692mm 1488mm -12%
 Annual temperature 24.3°C 25.6°C +1.3°C


Source:  Worldclim &IPCC5 RPC 6.0 CSIRO Mk 3.6.0

 

Total annual rainfall 2000

Total annual rainfal 2050

Average temperature 2000

Average temperature 2050

For more information, download the brochures below:

Rainfall Map of East Timor for 2000 and 2050

Climate Change and Population Growth in Timor Leste – Ambio Research paper

Climate Change in Timor Leste – Report from PCCSP

Summary of the predicted changes in rain, temperature and sea level

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