Future Growing Seasons: Bias Correction with SVR and QDM for Indonesian Temperature Projection under RCP 2.6 and RCP 8.5

Authors

  • Brina Miftahurrohmah Department of Information Systems, Universitas Internasional Semen Indonesia, Gresik, Indonesia
  • Irvan Adhin Cholilie Department of Agroindustrial Technology, Universitas Internasional Semen Indonesia, Gresik, Indonesia
  • Sekarsari Utami Wijaya Department of Logistics engineering, Universitas Internasional Semen Indonesia, Gresik, Indonesia
  • Felix Atmaja Department of Information Systems, Universitas Internasional Semen Indonesia, Gresik, Indonesia
  • Taufiqotul Bariyah Department of Informatics, Universitas Internasional Semen Indonesia, Gresik, Indonesia
  • Catur Wulandari Department of Information Systems, Universitas Internasional Semen Indonesia, Gresik, Indonesia & Interfaculty Center for Teacher Training, Educational Research and Further Training of Leiden University, Leiden, Netherland

DOI:

https://doi.org/10.59796/jcst.V15N2.2025.100

Keywords:

bias correction, SVR, QDM, mean temperature, GSL, RCP 2.6, RCP 8.5

Abstract

Human activities have significantly contributed to greenhouse gas (GHG) emissions, escalating global temperatures and exacerbating extreme weather events, which pose serious agricultural threats by disrupting crop growth. Climate researchers employ Representative Concentration Pathways (RCPs) to forecast future GHG scenarios. Downscaling techniques have improved predictions of Growing Season Lengths (GSL) predictions and mean temperatures (Tmean), both of which are crucial for agricultural planning. This study evaluated Support Vector Regression (SVR) and Quantile Delta Mapping (QDM) for projecting Tmean and its impact on GSL under RCP 2.6 and RCP 8.5. Bias correction was applied to historical Tmean data using both methods, based on ERA5 data. SVR showed a lower Root Mean Square Error (RMSE) (0.6 vs 1.1) and a slightly higher correlation (0.6 vs. 0.5) than QDM. However, QDM was chosen for Tmean projection due to its superior data homogeneity and better alignment of standard deviation with observed values. Projections indicated a significant Tmean increase after 2026 under both RCPs, with Tmean under RCP 8.5 expected to exceed 30°C between 2050 and 2100, necessitating heat-resistant crop varieties. Greater increases in GSL under RCP 2.6 underscored the need for effective mitigation strategies. This study emphasizes adaptive farming practices and recommends integrating quantile-based and machine learning methods into future climate projections to enhance agricultural resilience.

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Published

2025-03-25

How to Cite

Miftahurrohmah, B., Adhin Cholilie , I., Utami Wijaya, S., Atmaja, F., Bariyah, T., & Wulandari, C. (2025). Future Growing Seasons: Bias Correction with SVR and QDM for Indonesian Temperature Projection under RCP 2.6 and RCP 8.5. Journal of Current Science and Technology, 15(2), 100. https://doi.org/10.59796/jcst.V15N2.2025.100

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Vol. 15 No. 2 (2025): April-June

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