• Assessing climate change impacts on water balance in the Mount Makiling forest, Philippines

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    • Keywords

       

      BROOK90 model; CGCM3 experiment; Mount Makiling forest reserve; statistical downscaling; water balance.

    • Abstract

       

      A statistical downscaling known for producing station-scale climate information from GCM output was preferred to evaluate the impacts of climate change within the Mount Makiling forest watershed, Philippines. The lumped hydrologic BROOK90 model was utilized for the water balance assessment of climate change impacts based on two scenarios (A1B and A2) from CGCM3 experiment. The annual precipitation change was estimated to be 0.1–9.3% increase for A1B scenario, and −3.3 to 3.3% decrease/increase for the A2 scenario. Difference in the mean temperature between the present and the 2080s were predicted to be 0.6$–$2.2°C and 0.6$–$3.0°C under A1B and A2 scenarios, respectively. The water balance showed that 42% of precipitation is converted into evaporation, 48% into streamflow, and 10% into deep seepage loss. The impacts of climate change on water balance reflected dramatic fluctuations in hydrologic events leading to high evaporation losses, and decrease in streamflow, while groundwater flow appeared unaffected. A study on the changes in monthly water balance provided insights into the hydrologic changes within the forest watershed system which can be used in mitigating the effects of climate change.

    • Author Affiliations

       

      E A Combalicer1 2 R V O Cruz3 S Lee4 S Im4

      1. College of Forestry, Nueva Vizcaya State University, 3700 Bayombong, Nueva Vizcaya, Philippines.
      2. Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul, 151–921, Korea.
      3. College of Forestry and Natural Resources, University of the Philippines Los Banos, College, Laguna, Philippines.
      4. Department of Forest Sciences, Research Institute for Agriculture & Life Sciences, College of Agriculture and Life Sciences, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul, 151–921, Korea.
    • Dates

       
  • Journal of Earth System Science | News

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      Posted on July 25, 2019

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