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<p>Understanding of spatiotemporal variability of drought and related atmospheric circulation patterns is critical in improving the predictability of future drought and mitigating adverse impacts of drought risks. This study investigates the spatiotemporal characteristics of multiscale drought variability in the Democratic People’s Republic of Korea (DPRK) during 1951–2022 using the standardized precipitation evapotranspiration index (SPEI) and related atmospheric circulation patterns. Mann–Kendall test, Sen’s slope estimator and Pettitt test were used to analyze the trends and abrupt changes of SPEI for season, semi-annual and annual scales regarding different climate zones. The annual and wet season (April–September) SPEI averaged over DPRK shows a significant decreasing trend (<i>p</i>&lt;0.05) with a rate of –0.119/decade and –0.110/decade, respectively. The principal component analysis (PCA) was applied to spring and wet season SPEI to identify three sub-regions with different temporal evolution of droughts. Considering the correlation between principal component scores and climate variable anomalies, the West Pacific Subtropical High (WPSH), the Okhotsk High and the East Asian monsoon were identified as the circulation patterns that have a significant influence on spring drought variability in the study area. The results can help stakeholders to take appropriate drought relief measures and to improve drought monitoring and forecasting systems.</p>

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Spatiotemporal variability of drought during 1951–2022 in the Democratic People’s Republic of Korea and related atmospheric circulation patterns

  • 期刊论文

  • 发表日期：

    2025年3月5日

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  • Hyon-U Kim,
  • Sang-Il Jong,
  • Kum-Chol Om,
  • Un-Sim Paek,
  • Kyong-Bok Sonu,
  • Ju-Yon Tak

摘要

Understanding of spatiotemporal variability of drought and related atmospheric circulation patterns is critical in improving the predictability of future drought and mitigating adverse impacts of drought risks. This study investigates the spatiotemporal characteristics of multiscale drought variability in the Democratic People’s Republic of Korea (DPRK) during 1951–2022 using the standardized precipitation evapotranspiration index (SPEI) and related atmospheric circulation patterns. Mann–Kendall test, Sen’s slope estimator and Pettitt test were used to analyze the trends and abrupt changes of SPEI for season, semi-annual and annual scales regarding different climate zones. The annual and wet season (April–September) SPEI averaged over DPRK shows a significant decreasing trend (p<0.05) with a rate of –0.119/decade and –0.110/decade, respectively. The principal component analysis (PCA) was applied to spring and wet season SPEI to identify three sub-regions with different temporal evolution of droughts. Considering the correlation between principal component scores and climate variable anomalies, the West Pacific Subtropical High (WPSH), the Okhotsk High and the East Asian monsoon were identified as the circulation patterns that have a significant influence on spring drought variability in the study area. The results can help stakeholders to take appropriate drought relief measures and to improve drought monitoring and forecasting systems.