| 李璠,肖建设,颜亮东.1964—2014年青海省三江源地区日降水格局分析[J].干旱地区农业研究,2016,34(5):282~288 |
| 1964—2014年青海省三江源地区日降水格局分析 |
| Precipitation pattern of Three-River Source Area in Qinghai from 1964 to 2014 |
| |
| DOI：10.7606/j.issn.1000-7601.2016.05.43 |
| 中文关键词: 三江源 降水量 降水日数 降水等级 间隔期 |
| 英文关键词:Three-River source area precipitation amount precipitation days precipitation grade inter-precipitation period |
| 基金项目:青海省科技厅重点项目“青海牧区轮牧的精细规划与管理模式研究”(2012-n-529); 中国气象局行业专项“气候变化背景下农业气象灾害对我国农业生产影响的评估技术”（GYHY201106021） |
|
| 摘要点击次数: 1678 |
| 全文下载次数: 1224 |
| 中文摘要: |
| 三江源位于青藏高原腹地，是气候变化敏感区，尤其对降水变化十分敏感。利用1964—2014年三江源地区13个气象站的日降水资料，对三江源地区降水量、降水日数、降水间隔期分等级探讨。结果表明:1964—2014年三江源地区年均降水量为467.48 mm，自2000年起呈现显著增加趋势，降水量以中等强度以上的降水为主，导致年降水量发生变化的主要原因是强降水量的影响；年均降水日数为137.83 d，以中等强度以下的降水日数为主；每年降水间隔期次数为40.06次，以≤5 d的间隔期为主，占总间隔次数的83.55%；三江源13个气象站降水量资料显示，久治县降水最稳定，沱沱河最不稳定。同时，以历年降水量与生产力研究为基础，降水是三江源西部地区生产力变化的主要限制因子之一。三江源地区干旱年份与极端弱降水量年份吻合，可初步断定年降水量和降水日数增加，＞5 d间隔次数减少可减缓三江源地
区干旱发生及干旱化程度。 |
| 英文摘要: |
| Three-River Source Area is situated on Tibet Plateau, which is very sensitive to climate change, especially to precipitation. Based daily precipitation data from 1964 to 2014 in Three-River Source Area, precipitation amounts, precipitation days, inter-precipitation periods at different levels were analyzed. The results showed that annual precipitation amount was 467.48 mm in Three-River Source Area, increased significantly since 2000. The amount was dominated by high/moderate precipitation amounts, mainly due to changes from heavy precipitation. Annual precipitation day was 137.83d, dominated by low/moderate precipitation days. The inter-precipitation period was 40.06 times, dominated by inter-precipitation period of ≤5 d, accounting for 83.55%. Data from 13 meteorological stations were collected, suggesting that the precipitation of Jiuzhi was most stable, rather not Tuotuohe. In addition, precipitation was one of primary limiting factors, according to the study of precipitation and production in Three-River Source Area. Occurrence periods of drought and light precipitation were consistent, indicating annual precipitation amounts and days were increased and >5 d inter-precipitation period were decreased, relieving the occurrence of drought and its severity. |
| 查看全文 查看/发表评论 下载PDF阅读器 |