| 李红梅,王钊,高茂盛.CI指数的改进及其在陕西省的适用性分析[J].干旱地区农业研究,2015,33(3):260~266 |
| CI指数的改进及其在陕西省的适用性分析 |
| The improved of comprehensive meteorological drought index and its application in Shaanxi Province |
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| DOI：10.7606/j.issn.1000-7601.2015.03.41 |
| 中文关键词: 综合气象干旱指数(CI) 改进的综合气象干旱指数(CInew) 干旱频率 干旱强度 降水强度 土壤相对湿度 陕西省 |
| 英文关键词:comprehensive meteorological drought index(CI) improved comprehensive meteorological drought index(CInew) drought frequency drought intensity precipitation intensity soil relative moisture Shaanxi Province |
| 基金项目:陕西省农业科技创新项目（2012NKC01-19）；陕西省气象局科技创新基金计划项目（2012M-14） |
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| 中文摘要: |
| 利用陕西4个站点2002—2012年逐日降水、气温资料和气象干旱指数，结合测墒站建站至2012年墒情数据，通过增加变量和调整权重系数对CI进行改进，统计分析改进前后的综合气象干旱指数在陕西干旱过程描述、频率及强度等方面的应用情况和改进效果，并比较了与同期土壤相对湿度的相关性差异。结果表明：改进的综合气象干旱指数（CInew）监测的干旱日数较CI偏少，春夏季尤为明显。各等级干旱发生频率CInew较CI偏低0.1%～8%，年干旱强度较CI平均偏低64.2，但改进前后的综合气象干旱指数在年干旱日数、频率、强度的总体变化特征方面并没有显著差异，均能反映出陕西干旱频率及强度的变化特征。CInew在具体干旱过程监测中的不合理跳跃次数明显减少，克服了CI对弱降水的骤然反应，保留了对强降水的敏感性，CInew与土壤相对湿度的相关性达0.9，较CI明显偏好，监测过程更符合实际干旱的演变规律，程度更贴近实际。因此，CInew可以作为陕西干旱监测与评估指标之一在业务中推广应用。 |
| 英文摘要: |
| The improved comprehensive meteorological drought index (CInew) was proposed in view of shortages of comprehensive meteorological drought index (CI) by adding new variables and changing the weight coefficients of variables based on the daily precipitation, daily temperature, meteorological drought index at 4 stations from 2002 to 2012, and soil moisture data from the start of record to 2012. Compared with CI index, applicability characteristics and effects of CInew were analyzed through the descriptions of the drought course, frequency, and intensity. The correlation between the soil moisture data and monitor data from CI and CInew was also analyzed. The results showed that the number of drought days monitored by CInew was fewer than that by CI, especially during spring and summer. Frequency of drought at different levels monitored by CInew was lower by 0.1%～8% than that of CI. Annual average drought intensity by CInew was 64.2 lower than that by CI. However, no statistical significant differences between CI and CInew during drought days were observed on distribution of drought frequency and drought intensity change, both of which could reflect the characteristics of drought frequency and drought intensity variation. The unreasonable jumping times were found to be decreased significantly by CInew monitoring, which coped with CI on the drought abrupt change to weak precipitation and retained sensitivity to heavy rainfall. Correlation coefficient between CInew and soil moisture was 0.9, better than that between CI and soil moisture. Compared with CI index, CInew could objectively reflect the drought degree and the process to evaluate. Hence, CInew could be used as an index for drought monitoring and evaluation in Shaanxi Province. |
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