...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Effects of interbasin water transfer on regional climate: A casestudy of the Middle Route of the South-to-North Water TransferProject in China
【24h】

Effects of interbasin water transfer on regional climate: A casestudy of the Middle Route of the South-to-North Water TransferProject in China

机译：跨流域调水对区域气候的影响-以中国南水北调中线工程为例

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this study, a water transfer mechanism was implemented into the regionalclimate model, RegCM3, to represent water to be transferred by increasing theprecipitation that reached the surface in intake areas. The effects of interbasin watertransfer on local and regional climates were then studied based on numericalsimulations conducted using the RegCM3 model. The Middle Route of the South-to-NorthWater Transfer Project (MRSNWTP) in China was chosen as a case study toinvestigate the climatic responses under three different water transfer schemes withthree intensities. Four 10-year simulations were conducted, a control run (MCTL)without water transfer, and three water transfer runs (MWT I , MWT2, and MWT3)related to the three schemes. In the three water transfer runs, spatial and temporal watertransfer data were derived from the schemes under the assumption that the quantity of waterto be transferred into a county in the intake area in a year for each scheme wasdistributed evenly into each time step. Increases in top-layer soil moisture and latent heatflux were observed when compared to the control, and these increases were found tooccur as a direct result of injecting water into the intake area. The increases in latent heatflux and evaporation were accompanied with decreases in sensible heat flux, mean airtemperature, and increases in precipitation in the intake area. These differences weregenerally small and statistically insignificant, indicating that the water transfer plays asmall role in influencing regional climate in our simulations. However, the climaticinfluence intensity of a water transfer scheme was found to be positively related to thequantity of water to be transferred, and to have strong seasonal variability, with largereffect being observed in spring and autumn than in summer and winter. We also conducteda water transfer run, MWT4, using the same configuration as MWT3 but under theassumption that the quantity of water was distributed evenly into each time step of the firsthalf of the year. Comparison of the two runs shows a stronger seasonal variability in theclimatic influence when the water was assigned into the first half of the year than when itwas assigned into the entire year. Further analysis revealed that the water transfer couldreduce both the seasonal and diurnal temperature ranges at the surface and that the decreasein temperature could diffuse over almost the entire Huabei Plain below 700 hPa, therebyweakening the wind velocity of the easterly breeze. It follows from the analyses of thevertical profiles of the water vapor content and the atmospheric moisture budgets that thewater transfer can affect the local and regional climates by changing the local water vaporcontent and the regional water vapor transports, which in turn influences precipitation.
机译：在这项研究中，将一种调水机制应用到了区域气候模型RegCM3中，以通过增加到达进水区地表的降水来表示要调水。然后使用RegCM3模型进行数值模拟，研究跨流域调水对局部和区域气候的影响。以中国南水北调中线（MRSNWTP）为例，研究了三种不同强度，三种强度的调水方案下的气候响应。进行了四个十年的模拟，一个不进行调水的控制运行（MCTL），以及与这三个方案相关的三个调水运行（MWT I，MWT2和MWT3）。在这三个输水运行中，假设每个方案每年将要转移到取水区一个县的水量平均分配到每个时间步，则从这些方案中获得时空输水数据。与对照相比，观察到顶层土壤水分和潜热通量增加，并且发现这些增加是由于将水注入进水口区域的直接结果而发生的。潜热通量和蒸发量的增加伴随着显热通量，平均气温的降低以及进气区降水的增加。这些差异通常很小，在统计上微不足道，这表明在我们的模拟中，水的转移对影响区域气候起着很小的作用。但是，发现调水方案的气候影响强度与调水量成正相关，并且具有强烈的季节变化性，春季和秋季比夏季和冬季有较大的影响。我们还使用与MWT3相同的配置进行了MWT4输水运行，但假设水量在今年上半年的每个时间步均分配。两次运行的比较显示，当将水分配给一年的上半年时，其气候影响的季节性变化要比将其分配给全年的情况更强。进一步的分析表明，水的转移可以减少地表的季节性和昼夜温度范围，并且温度的降低可以在700 hPa以下的几乎整个华北平原扩散，从而减弱了东风的风速。通过对水蒸气含量和大气水分收支的垂直分布图的分析得出，水的转移可以通过改变局部水蒸气含量和区域水蒸气传输而影响局部和区域气候，进而影响降水。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号