The influence of large dams on surrounding climate and precipitation patterns
The influence of large dams on surrounding climate and precipitation patterns
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DOI：
10.1029/2010gl046482
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发表时间：
2011-02-24
影响因子：
5.2
通讯作者：
Chronis, Themis
中科院分区：
文献类型：
--
作者：
Degu, Ahmed Mohamed;Hossain, Faisal;Chronis, Themis
了解大型水坝对当地气候的影响是确定人工水库是否无意中改变蓄水流域降水模式的关键。利用30年的再分析数据记录，确定了与降水形成有关的大气变量在北美92座大坝的水库岸线周围的空间梯度。我们的研究报告指出，大型水坝对地中海和半干旱气候地区的气候影响最大，而对潮湿气候地区的影响最小。清晰的空间梯度的对流可用的势能，比湿度和表面蒸发也观察到周围的水库海岸线之间的边缘，远离这些大坝。由于CAPE和极端降水量之间的相关性越来越大，我们的研究结果指出，在地中海和美国干旱气候的蓄水盆地风暴加剧的可能性。引用：Degu，A. M.，F. Hossain，D.尼约吉河老皮尔克J. M. Shepherd，N. Voisin和T. Chronis（2011），大型水坝对周围气候和降水模式的影响，地球物理学。保留信函：38，L04405，doi：10.1029/2010GL046482。
Understanding the forcings exerted by large dams on local climate is key to establishing if artificial reservoirs inadvertently modify precipitation patterns in impounded river basins. Using a 30 year record of reanalysis data, the spatial gradients of atmospheric variables related to precipitation formation are identified around the reservoir shoreline for 92 large dams of North America. Our study reports that large dams influence local climate most in Mediterranean, and semi-arid climates, while for humid climates the influence is least apparent. Clear spatial gradients of convective available potential energy, specific humidity and surface evaporation are also observed around the fringes between the reservoir shoreline and farther from these dams. Because of the increasing correlation observed between CAPE and extreme precipitation percentiles, our findings point to the possibility of storm intensification in impounded basins of the Mediterranean and arid climates of the United States. Citation: Degu, A. M., F. Hossain, D. Niyogi, R. Pielke Sr., J. M. Shepherd, N. Voisin, and T. Chronis (2011), The influence of large dams on surrounding climate and precipitation patterns, Geophys. Res. Lett., 38, L04405, doi: 10.1029/2010GL046482.