COMPARISON OF CHLOROPHYLL-A CONCENTRATION DURING HAZE AND NO HAZE CONDITION IN RIAU ISLANDS, INDONESIA

摘要

Forest fires and peatland in Riau, Sumatra often occur each year even smoke and dust up of Malaysia and Singapore. This study compared the concentration of Chlorophyll-a around Riau Islands during haze and without haze condition. Water sampling was performed in 28 to 29 June 2013 and 30 June 2014 in the waters between Karimun and Batam (Riau Islands). Ocean color data from Aqua MODIS during 2013 - 2014 were analyzed to know the variation of Chlorophyll-a. From the result, it was obtained that the Chlorophyll-a's content is minimum in wet season (December-January) and maximum in dry season (June-August). The wind that blow in 19 to 28 of June 2013 was moved west to east with average velocity at 0.3 m/s and giving the impact for the spread of wildfire ashes in Riau Province. So the content of the nutrient has increased when wildfire happen compared when it hasn't. From the remote sensing method, it was known that the Chlorophyll-a's content while wildfire occur increased compared when no wildfire, especially in June when dry season happen. Then the Chlorophyll-a's content was increased at 7-41% when wildfire occurred in May-June and decreased when the wildfire occurred in January-February. If we compare it with Chlorophyll-a's annual average, it was increased around 23-89% in June-July (Dry Season) and decreased around 44-50% in January-February (Wet Season).