Analysis of Climate Change in Makassar City using Mann-Kendall Trend Analysis
Miftah Al Ansahri (a*), Samsuar (b), Salengke (b)

a) Agricultural Engineering, Agricultural Faculty of Hasanuddin University.
*aldio.mifta100599[at]gmail.com
b) Agricultural Engineering, Agricultural Faculty of Hasanuddin University.

Abstract

Based on geografical aspects, Indonesia is located on the equator between 6 N and 11 South Latitude and 95 East Longitude to 141 East Longitude, this causes only two seasons in Indonesia, dry season and wet season. As a result of global warming, extreme changes in weather and climate often occur, it can affect environmental conditions which in turn will affect several aspects of human life or activities. Climate change factors, among others- temperature, rainfall, wind speed, sun radiation intensity, and humidity (RH). This research is based on a form of climate change analysis to determine the trend of climate change in an area. The research was conducted using the Mann-Kendall trend analysis method and polynomial function approach to see the occurrence of a shift in the month within 30 years (1990-2019). The results obtained in this study are that there are several factors that indicate significant changes, among others- There is a significant decrease in wind speed and sun intensity, while a significant increase in the maximum and minimum factors and the average temperature. The factors that do not show a significant change include- Rainfall and humidity (RH). Analysis of the shift of the rainy month for 30 years with polynomials obtained by the average value of the early of the dry season on the 135th day and the early of the rainy season on the 304th day, where the average length of the dry season is 169 days (May-October), This analysis of the shifting of months is described in a graph with a trendline which shows that there is no significant change at the early of the dry season and the early of the rainy season, and the length of the dry season for 30 years does not change significantly (constant).

Keywords: Rainfall, Mann-Kendal Test, Trend Analysis, Polynomial

Topic: Soil and Water Engineering