Recent Trends in Frost Damage on Tea in Uji, Kyoto Prefecture and Their Relationship to Climate Warming
京都府宇治市における近年の茶の凍霜害の発現傾向と気候温暖化の関係
Summary
Uji first-flush frost damage is rising as warmer Marches trigger early budbreak while Aprils trend cooler.
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About this paper
What they said
“After a March averaging 8°C or higher, the frequency of frost damage becomes extremely high on April days when the daily minimum falls to 0°C or below.”
3月平均気温が8℃以上の後の4月における日最低気温0℃以下の低温日に発現頻度が極めて高くなる。
“Since 1990, climate warming has raised temperatures in most months, but while March warming is especially pronounced, April is actually trending cooler, creating conditions prone to frost damage.”
1990年以降の気候の温暖化は1年の大部分の月での気温の上昇を伴っているが，3月は特に気温の上昇が顕著である一方，4月はむしろ下降傾向で，凍霜害が発現しやすい状況となっている。
The numbers
March mean temperature frost threshold: 8°C
April daily minimum frost threshold: 0°C
Warming trend baseline year: 1990
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