| 史尚渝,王飞,金凯,丁文斌.基于SPEI的1981—2017年中国北方地区干旱时空分布特征[J].干旱地区农业研究,2019,37(4):215~222 |
| 基于SPEI的1981—2017年中国北方地区干旱时空分布特征 |
| Temporal and spatial characteristics of drought based on SPEI in northern China from 1981 to 2017 |
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| DOI：10.7606/j.issn.1000-7601.2019.04.29 |
| 中文关键词: 北方地区 干旱时空分布 SPEI REOF |
| 英文关键词:northern China temporal and spatial characteristics of drought standardized precipitation evapotranspiration index(SPEI) rotational empirical orthogonal matrix(REOF) |
| 基金项目:国家重点研发计划(2016YFC0501707);国家自然科学基金(41771558);中国科学院国际合作局对外合作重点项目(16146KYSB20150001);欧盟委员会Horizon2020项目(635750) |
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| 中文摘要: |
| 基于逐日降水量实测数据以及根据Penman-Monteith公式获取的潜在蒸散发量，计算了中国北方地区1981-2017年的标准化降水蒸散指数（SPEI），并采用Mann-Kendall检验及旋转经验正交矩阵（REOF）等方法，探讨了近37年来北方地区干旱时空分布特征。结果表明：（1）1981-2017年北方地区约有74%的区域SPEI呈减小趋势，其中显著减小（P<0.05）的区域占总面积的43%，区域平均SPEI趋势率为-0.015·a-1（P<0.01），1994年为其突变年；（2）近37年来，北方地区轻度干旱（-1.2 |
| 英文摘要: |
| Based on the measured daily precipitation and calculated the potential evapotranspiration,using Penman-Monteith formula, the standardized precipitation evapotranspiration index (SPEI) from 1981 to 2017 in northern China was established.The Mann-Kendall test (MK)and rotating empirical orthogonal matrix (REOF) method were used to explore the temporal and spatial characteristics ofdrought in this region over 37 years. The results showed that: (1) About 74% of the whole region had decreasing SPEI from 1981 to 2017, and about 43% of area of whole region had a significant decrease trend. The average SPEI trend rate was -0.015·a-1 (P<0.01). Moreover, the turning point of SPEI change occurred in1994; (2) The area that the frequency of slightly arid (-1.2 |
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