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冰川冻土 ›› 2001, Vol. 23 ›› Issue (3): 225-230.

• 研究论文 • 上一篇    下一篇

青藏高原积雪异常的持续性研究

韦志刚   

  1. 中国科学院寒区旱区环境与工程研究所, 甘肃, 兰州, 730000
  • 收稿日期:2001-05-10 修回日期:2001-05-31 出版日期:2001-08-25 发布日期:2012-04-26
  • 基金资助:
    中国科学院知识创新工程重大项目(KZCX1-10-07);国家重点基础研究发展规划项目(G1998040900);中国科学院寒区旱区环境与工程研究所知识创新工程项目(Cx210097)资助

Persistence of the Snow Anomalies on the Qinghai-Tibetan Plateau

WEI Zhi-gang   

  1. Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou Gansu 730000, China
  • Received:2001-05-10 Revised:2001-05-31 Online:2001-08-25 Published:2012-04-26

摘要: 选取青海省和西藏自治区境内的72个气象站,自建站至1999年12月逐日观测的积雪深度资料,规定凡观测到地面有0.5cm以上积雪深度的日子作为积雪日,分别统计了月、冬春、年的积雪日数.通过对积雪日数的分析,确定出高原冬春积雪的异常年份,分析了这些异常年份高原积雪的持续特征.结果表明:高原冬春总体积雪的异常主要是由11月至翌年3月的积雪异常决定的,高原冬春的积雪异常和春末夏初的积雪异常是不相一致的;一般来讲,高原积雪负异常至少持续4个月,大多数年份要持续个月以上;积雪正异常个别年份可持续个月,一般为2~4个月,积雪的持续正异常一般到3月份就结束了;高原冬春总体积雪的正负异常都很难持续到春末夏初,高原冬春异常多积雪的大规模消融期在2月末到3月初.

关键词: 积雪, 持续性, 青藏高原

Abstract: By using the data of daily snow depth from the month of station built to December 1999 at 72 meteorological stations over the Qinghai- Tibetan Plateau, according to the rule that the snow cover day indicates the day which the snow depth ≥0.5 cm, the monthly, the winter-spring and the annual number of snow cover days are summarized. The anomalous winter-spring snow years are determined and the persistence characters of the snow anomaly on the Qinghai-Tibetan Plateau are analyzed. It is showed that the anomalies of the winter-spring snow cover are mainly decided by the snow anomalies from November to March, and arent in accordance with the ones in May and June. The negative anomalies can persist for 4 months at least in general and more than 6 months in most years, while the positive anomalies can last for 6 months in individual year and 2~4 months in general with ending in March in general. It was hardly happened that the positive or negative anomalies of the winter-spring snow persist to May and June. The main melting season of the snow in snowy winter-spring occurs from the later of February to the early of March. The snow of the winter-spring exists mainly on some high mountains. It is showed that there are four regions of the maximal value in the distribution map of the snow cover days observed by the stations. These regions are the northern slopes of the Himalaya Mountain, the region from the west of the South Qinghai Plateau to the North Tibetan Plateau, the East Plateau Pasturing Region from the eastern slopes of the Bayan Har Mountains to the southern slopes of the Anyêmaqên Mountain, the southern slopes of the Qilian Mountains in the northeastern Qinghai Province.

Key words: snow, persistence, Qinghai-Tibetan Plateau

中图分类号: 

  • P426.3+5