| 题名 | 卫星降水产品在天山的适用性评价及降尺度研究 |
| 作者 | 金晓龙 |
| 答辩日期 | 2017-05-01 |
| 文献子类 | 硕士 |
| 授予单位 | 中国科学院大学 |
| 授予地点 | 新疆乌鲁木齐 |
| 导师 | 张弛 |
| 关键词 | 卫星降水数据 精度评价 降尺度 极端降水 时空变化 Satellite precipitation data Accuracy evaluation Downscalling Extreme precipitation Temporal and spatial variation |
| 学位专业 | 理学硕士 |
| 英文摘要 | High accuracy precipitation data is very important for regional climate andhydrological research. Based on 199 meteorological stations, we evaluated 3 sets ofsatellite precipitation datasets (CMORPH, GPM, TRMM) in Tishan mountains usingvarious statistical method. And put forward a new downscaling method based onprecipitation intensity, the precipitation distribution information from GPM and PTPLSGeographic-Precipitation correlation model. Finally, we analyzed the temporal andspatial variation of precipitation in Tianshan mountains based on the downscaledprecipitation data. The main conclusions are as follows:(1) The satellite precipitation data perform better in summer and autumn, amongwhich, GPM has the highest correlation coefficients and minimum relative errors(PB≈10%) with meteorological records. GPM has the minimum error in each elevationzones. In addition, satellite datasets has a better skill to capture weak precipitationevents. In a word, GPM could capture the precipitation changes accurately in Tianshanmountains, and can be applied to the ecology and hydrology research.(2) The annual precipitation of downscaled TRMM data is consistent with theobserved values, with the value of R2 above 0.7, reduce the average error of originalTRMM data effectively, but there is obvious differences between the rainy season (4-10 months) and dry season (11-3 months). The simulated runoff driven by downscaledTRMM data could accurately reflect the change of runoff in Akesu Basin, with thecorrelation coefficient >0.82 and the NS coefficient of 0.48.(3) Precipitation in the northern slope of Tianshan mountains behaves moreregular, with little differences through the whole year, however, The precipitation ofsouthern slope has remarkable seasonality. The results of M-K test show that: there areless precipitation in central and western part of Tianshan, while the precipitation in east,south Tianshan and Yili valley are increase. The PRCPTOT, R95p, R99p and R10mmhave been significantly reduced in the past 20 years, while Rx1d, CWD showed asinificant increase trend. As a whole, the amount and frequency of extreme precipitation in Tianshan are decreasing. |
| 语种 | 中文 |
| 学科主题 | 地图学与地理信息系统 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.xjlas.org/handle/365004/14879]  |
| 专题 | 新疆生态与地理研究所_研究系统_空间对地观测与系统模拟研究室 |
| 作者单位 | 中国科学院新疆生态与地理研究所 |
| 推荐引用方式 GB/T 7714 | 金晓龙. 卫星降水产品在天山的适用性评价及降尺度研究[D]. 新疆乌鲁木齐. 中国科学院大学. 2017. |
| 个性服务 |
| 查看访问统计 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论