Frost-free Season - National Climate Assessment
网页The length of the frost-free season (and the corresponding growing season) has been increasing nationally since the 1980s and is projected to continue to lengthen. Explore changes in the frost-free season.
无霜期 - 维基百科，自由的百科全书
网页无霜期（英語： frost-free period ），又称无霜冻期。 在 气象学 中，一年入秋后出现第一次 霜降 的日期为“初霜日”（又称早霜），第二年入春最后一个霜日为“终霜日”（又称晚霜），终霜日的次日到初霜日的前日即为无霜期 [ 1 ] 。
Change and attribution of frost days and frost‐free periods in …
网页2023年11月22日 · Frost events are a climatic phenomenon of great severity, exerting profound impacts on agricultural production and human endeavours. From 1961 to 2017, China experienced a reduction in frost days (FDs) and elongation of frost-free periods (FFPs) across most regions.
1951年以来中国无霜期的变化趋势 - dlyj.ac.cn
网页This study explores the spatial distribution of the first frost date, last frost date and the frost-free period in China through an in-depth analysis of the daily minimum temperature. Accumulative anomaly and linear trend estimation are used to describe the trends in the first frost date, last frost date and the length of the frost-free period.
Frost-Free Season - Climate Central
网页2016年10月11日 · The frost-free season, defined as the stretch between the last 32°F reading in the spring and the first 32°F reading in the fall, has increased in length over the past 30 years, with both an...
量化中国气候变化下无霜期和霜冻天数的趋势和变化 - 知乎
网页FD 的定义是每日最低温度低于 0°C 的年度天数。 本研究使用 ERA5-Land 的每日最小 Ta 来计算 FD。 统计指数用于定量分析 ERA5-Land 在估计每日最低Ts和每日最低 Ta 时的表现。 使用非参数 Mann-Kendall (MK) 测试来分析 Ts、Ta、FFP 和 FD 的趋势和显著性水平。 为了测量变异趋势，使用 Sen's 斜率法来分析变异的斜率。 图 1. 中国五大气候区：高寒气候区 (ALCZ)、温带大陆性气候区 (TECZ)、温带季风气候区 (TMCZ)、亚热带季风气候区 …
Variability in frost occurrence under climate change and …
网页2022年5月4日 · The frost-free period in 1955–1984 varied by 35 days along the latitude, lasting 124 days in the South (from DOY 142 [panels C,G in Fig. S1] to 265 [panels D,H in Fig. S1]), and 89 days in the ...
Change and attribution of frost days and frost‐free periods in China
网页2023年11月22日 · Frost events are a climatic phenomenon of great severity, exerting profound impacts on agricultural production and human endeavours. From 1961 to 2017, China experienced a reduction in frost...
Trends in the frost-free period in China from 1951 to 2012
网页This study explores the spatial distribution of the first frost date, last frost date and the frost-free period in China through an in-depth analysis of the daily minimum temperature. Accumulative anomaly and linear trend estimation are used to describe the trends in the first frost date, last frost date and the length of the frost-free period.
Quantifying the Trends and Variations in the Frost-Free Period
网页2022年5月17日 · The frost-free period (FFP) is the period of the year after the last frost day (LFD) and before the first frost day (FFD), during which no hoarfrost occurs [1,2,3]. The FFP is closely related to the growing period of crops, as a long FFP is associated with a long growing period of crops, and the length of the FFP is a very important heat index ...
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