Distinct responses in the soil moisture (SM) between the two most severe meteorological droughts in Korea are examined. Although total accumulated precipitation deficit during 1994–1996 drought was slightly less than in the 2013–2017 drought, 1994–1996 drought showed a record-breaking negative SM anomalies, while the accumulated negative SM anomalies during 2013–2017 were less than half of those in 1994–1996. In 1994–1996 case, robust precipitation deficits occurred early in the event, leading to subsequent precipitation shortages under dry conditions. In addition, precipitation deficit was observed not only during wet seasons but also throughout dry seasons. This amplifies the SM response, as the runoff volume remains relatively constant despite reduced precipitation in arid soil conditions, which eventually reduces soil water retention led by the precipitation deficit. Conversely, in 2013–2017 case, precipitation deficit occurred during later period of the event and wet seasons, which leads a moderate SM drying signals.

中文翻译：

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朝鲜半岛两次严重气象干旱之间向农业干旱的不同传播


研究了韩国两次最严重的气象干旱之间土壤水分 （SM） 的不同响应。尽管 1994—1996 年干旱期间的总累积降水赤字略小于 2013—2017 年干旱，但 1994—1996 年干旱显示出创纪录的负 SM 距平，而 2013—2017 年期间累积的负 SM 距平不到 1994—1996 年的一半。在 1994-1996 年的情况下，事件早期出现了严重的降水不足，导致随后在干燥条件下出现降水短缺。此外，不仅在雨季，而且在整个旱季都观察到降水不足。这放大了 SM 响应，因为尽管在干旱土壤条件下降水减少，但径流量保持相对恒定，最终减少了降水不足导致的土壤保水能力。相反，在 2013—2017 年的情况下，降水不足发生在事件后期和雨季，这导致了温和的 SM 干燥信号。