Meteorological variables used in this study, as derived from the ERA-Interim reanalysis.

The following statistics have been computed for all variables: Mean, 1st Quartile (bottom Q), Median, 3rd Quartile (top Q), Standard Deviation of the original time series (SD), Standard Deviation of monthly means (SD S, representing intra-annual variations) and temporal variations (representing short-term ‘gradients’). The latter are computed according to daily or 6-hourly steps (see column Step). For 6-hourly variables, increments are increased by 10% at each subsequent steps (out to 5 steps, i.e. 30 hours) and by 15% for daily steps (out to 5 days). For air temperature (at 2 m height), also daily excursions are calculated using two additional variables, Tmin and Tmax, available at 6-hour intervals.

已针对所有变量计算得到如下统计量：均值（Mean）、第一四分位数（下四分位数，1st Quartile，bottom Q）、中位数、第三四分位数（上四分位数，3rd Quartile，top Q）、原始时间序列标准差（Standard Deviation of the original time series，SD）、月均值标准差（Standard Deviation of monthly means，SD S，用于表征年内变异）以及时间变异量（temporal variations，用于表征短期"梯度"）。后者将依据日度或6小时间隔进行计算（详见Step列）。针对6小时间隔变量，每后续一个时间步的增量将较前一步递增10%（最多覆盖5步，即30小时）；针对日度变量，每后续一个时间步的增量将较前一步递增15%（最多覆盖5天）。针对2米高度处的气温，还将通过两个额外的6小时间隔变量——最低气温（Tmin）与最高气温（Tmax）——计算每日气温波动幅度。