中国1:100万无霜期及其变化数据集（1951-2012）

按照入秋以来日最低气温第一次和最后一次低于0℃计算出初霜日和终霜日，自终霜日到初霜日的时间间隔为无霜期，并依据儒略日将初霜日和终霜日进行换算后，首先在农区尺度上根据累积距平分析初、终霜日和无霜期的变化特征，其次在站点尺度上查看三者的平均值和标准差的空间分布、线性倾向率空间分布以及无霜期的突变特征，以此将农区和站点两种尺度结合起来分析无霜期的变化趋势。

This dataset calculates the first frost date (FFD) and last frost date (LFD) using the first and last daily minimum temperatures below 0℃ recorded since the start of autumn. The frost-free period (FFP) is defined as the time interval between LFD and FFD. After converting FFD and LFD to Julian days, the variation characteristics of FFD, LFD and FFP are first analyzed at the agricultural region scale using cumulative anomaly analysis. Secondly, at the station scale, the spatial distributions of their mean values and standard deviations, the spatial distribution of the linear trend rates of the three variables, as well as the abrupt change characteristics of FFP are examined. By combining the two scales of agricultural region and station, the variation trends of the frost-free period are comprehensively analyzed.

搜集汇总

背景与挑战

背景概述

该数据集基于1951-2012年中国824个气象站点的日最低气温观测资料，通过计算初霜日和终霜日来推导无霜期，并在农区和站点两种尺度上分析无霜期的变化趋势。数据集空间覆盖中国全境，采用Albers_Conic_Equal_Area投影，数据量约为170.45 MB，属于农业气象学与农业气候学领域，旨在为气候资源研究提供科学数据支持。