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Change in summer daily precipitation and its relation with air temperature in Northwest China during 1957–2016

机译:1957–2016年中国西北地区夏季夏季降水的变化及其与气温的关系

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摘要

On the basis of the summer daily-precipitation meteorological data collected from weather stations across Northwest China from 1957 to 2016, this study evaluated the trends in 12-daily precipitation indices in the summer season and their relations with air temperature. Precipitation-event intensity, which was averaged over the total study area, increased in recent decades although the total precipitation continuously decreased. In particular, intensity generally decreased in the northern and eastern parts and increased in the southern and western parts of the study area. None of the 12 precipitation indices was significantly correlated with temperature in Xinjiang; R95N (number of events with precipitation greater than the longterm 95th percentile), RX1day (greatest 1-day total precipitation), PI (simple daily intensity), and R10 (number of heavyprecipitation days) were significantly and positively correlated with temperature in Qinghai–Gansu. However, low correlation coefficients were observed. In the Loess Plateau, P (total precipitation), WS (maximum number of consecutive wet days), R95N, and WD (number of wet days) were significantly and negatively correlated with temperature, whereas Gini (gini concentration index) and DS (maximum number of consecutive dry days) were significantly and positively correlated with temperature. Results of the study suggested that climate shift was evident in terms of daily precipitation, and the study area faced new challenges involving precipitation-event intensity increasing in the southwestern part and unevenly dispersing in the northwest.
机译:根据1957年至2016年从西北地区气象站收集的夏季每日降水气象数据,本研究评估了夏季12天降水指数的趋势及其与气温的关系。尽管总降水量持续减少,近几十年来在整个研究区域平均的降水事件强度有所增加。特别地,强度通常在研究区域的北部和东部降低,而在南部和西部升高。新疆的12个降水指数均与气温没有显着相关。在青海,R95N(降水量大于长期第95个百分位的事件数),RX1day(最大1天总降水量),PI(简单日强度)和R10(强降水天数)与气温显着正相关。甘肃然而,观察到低的相关系数。在黄土高原地区,P(总降水量),WS(连续湿天的最大天数),R95N和WD(湿天的天数)与温度呈显着负相关,而Gini(基尼浓度指数)和DS(最大)连续干旱天数)与温度呈显着正相关。研究结果表明,就日降水而言,气候变化是明显的,研究区域面临着新的挑战,即西南地区的降水事件强度增加而西北地区的分布不均匀。

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  • 来源
    《寒旱区科学(英文版)》 |2018年第4期|317-325|共9页
  • 作者单位

    Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;

    Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;

    Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;

    Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;

    Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;

    Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;

  • 收录信息 中国科学引文数据库(CSCD);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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  • 入库时间 2022-08-19 03:41:28
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