Analisis Nilai Konsentrasi Klorofil-A dan Tingkat Produktivitas Primer di Pulau Poncan, Kabupaten Tapanuli Tengah, Provinsi Sumatera Utara

Abstract

Poncan Island is one of the tourist destinations that attracts many people, the number of human activities can indirectly lead to changes in the value of primary productivity in a water body, Therefore, research is needed that aims to determine the value of chlorophyll-a concentrations in both surface and column waters and to estimate primary productivity that can describe all Poncan island waters. The methods used are estimating chlorophyll-a and Sea Surface Temperature using Landsat 8 and Aqua Modis Image Analysis, Estimating Primary Productivity using the Vertically Generalized Production Model (VGPM) method. Data analysis using Simple Linear Regression method on chlorophyll-a and Root Mean Square Eror (RMSE). The results of the analysis of chlorophyll-a concentration values on the island of Poncan with an average in surface waters with a value of 0,725 mg/m3 and in the water column is 0,685 mg/m3. Chlorophyll-a concentration distribution pattern data obtained from satellite image sensing processing with an average value of 0,642 mg/m3, Sea Surface Temperature on the island of Poncan analyzed on satellite images obtained an average result of 31,42 °C. The value of primary productivity using the VGPM model on the island of Poncan obtained values ranging from 796,515 – 806,022 mgC/m3/day. The results between the values of surface chlorophyll-a concentration and the water column on the island of poncan with a correlation value of 0,96 (very strong) between the two variables and a determination value of 0,92 and simple linear regression analysis on the relationship between Chlorophyll-a concentration and Primary Productivity with a correlation value of 0,99 which means very strong. The conclusion of this research is that the surface chlorophyll-a value is higher than the water column and the relationship between chlorophyll-a and primary productivity is very strong.