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- W3142569072 abstract "气候变暖将改变农业气候资源尤其是热量资源的时空分布。本文通过分析西北干旱区67个气象站点的气象数据, 研究了西北干旱区近50年气温、积温、霜冻的变化特征与规律。结果表明, 西北干旱区气温呈上升趋势, 上升幅度为0.33 ℃·10a<sup>-1</sup>, 高于全国平均水平, 其中北疆增温幅度大于其他地区。年内变化上, 冬季增温幅度最大。近50年, 西北干旱区≥0 ℃、≥10 ℃积温变化率分别为67.8 ℃·10a<sup>-1</sup>和68.8 ℃·10a<sup>-1</sup>, ≥0 ℃和≥10 ℃积温持续的时间也呈增加趋势, 其中≥0 ℃积温持续天数的增加主要是由于结束日期的推迟引起的, 而≥10 ℃积温天数的增加主要是因为初始日期的提前。研究区无霜期呈增加趋势, 主要表现为初霜日的延迟和终霜日的提前, 其趋势分别可达2 d·10a<sup>-1</sup>和 1.4 d·10a<sup>-1</sup>, 前者贡献略大。西北干旱区初霜出现日期的年际波动小于终霜日, 终霜出现日期晚于≥10 ℃积温开始日期约10 d, 且气温变暖的趋势并没有引起这一状况的改变, 而多数站点≥10 ℃积温结束日期早于初霜开始日期。" @default.
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- W3142569072 date "2013-01-01" @default.
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- W3142569072 title "Impact of climate warming on temperature and heat resource in arid Northwest China" @default.
- W3142569072 doi "https://doi.org/10.3724/sp.j.1011.2013.00227" @default.
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