中国农业气象

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Y干旱指数在冀东春旱监测中的应用

高桂芹;花家嘉;赵景旺;   

  1. 唐山市气象台;
  • 出版日期:2009-06-10 发布日期:2009-06-10
  • 基金资助:
    2007年唐山市科学技术与发展计划项目(07120205A-2)

Application of Y Drought Index in Spring Drought Monitoring in East Hebei Province

GAO Gui-qin,HUA Jia-jia,ZHAO Jing-wang(Tangshan Meteorological Observatory,Tangshan 063000,China)   

  • Online:2009-06-10 Published:2009-06-10

摘要: 利用唐山地区3个国家基准站1971-2000年的春季逐日降水、日最高气温资料,从干旱实时监测气象服务的需要出发,考虑了近期降水、土壤底墒(前期降水)和气温三种要素,计算Y干旱指数,并制定了干旱等级标准。对Y干旱指数与土壤湿度干旱指数、降水百分率干旱指数进行了同期对比分析;利用没有参加干旱指标划分的2006、2007年春季的土壤湿度资料对制定的干旱指标进行检验。结果表明,Y干旱指数对冀东春旱具有很好的监测能力,Y干旱指数能够客观的反映唐山地区春季各月的干旱状况,并填补了土壤湿度监测的盲区,能较好的划分唐山地区春季干旱趋势和等级;在一段时间内降水时空分布均匀的情况下,用降水距平百分率干旱指数进行监测,效果较好。在2006-2007年的检验中,Y干旱指数与土壤干旱指数表现一致,在没有土壤测墒的地区和时段,利用Y干旱指数可代替土壤湿度监测,实现干旱无缝隙监测。

关键词: 干旱指数, 干旱等级, 土壤湿度, 春旱监测

Abstract: Based on the data of the daily precipitation and daily maximum air temperature in 1971-2000 in three national benchmark stations in Tangshan,the Y drought index was calculated in consideration of three factors,including precipitation in recent period,the soil moisture preceding rainfall and air temperature. The drought severity degree was determined. The Y drought index was compared with the soil humidity drought index and precipitation anomaly percent at the same time. The verifications of Y drought index had done with the soil humidity data in the spring of 2006 and 2007. The results showed that the Y drought index was consistent with the soil drought index. The Y drought index could be used in the drought monitoring to replace the soil drought index.

Key words: Drought index, Drought index, Drought severity degree, Soil moisture, Spring drought monitoring