High-resolution fields of global runoff combining observed river discharge and simulated water balances -: art. no. 1042
High-resolution fields of global runoff combining observed river discharge and simulated water balances -: art. no. 1042
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DOI：
10.1029/1999gb001254
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发表时间：
2002-07-01
影响因子：
5.2
通讯作者：
Grabs, W
中科院分区：
文献类型：
--
作者：
Fekete, BM;Vörösmarty, CJ;Grabs, W
本文论证了将观测到的河流流量信息与气候驱动的水平衡模型（WBM）输出相结合，开发复合径流场的潜力。这种组合径流场既反映了流量测量的数值准确性，又保持了模拟径流的时空分布。从世界气象组织全球径流数据中心（GRDC）数据档案中选择的测量站在地理上以30（经纬度）空间分辨率（STN-30p）共同注册到网格模拟拓扑网络。确定了STN-30p网沿线各测量站间的站间区域，计算了年站间径流量。将年度站间径流与WBM计算的结果进行比较，WBM计算使用长期平均月气候强迫（气温和降水）进行。每个单元的模拟径流乘以GRDC数据集中相应站间区域的观测径流与模拟径流的比值，得到30分辨率的空间分布径流场。由此产生的复合径流场（UNH/GRDC复合径流场V1.0）与中间数据集一起发布给科学界，例如所选测量站的站属性和长期每月变化情况、模拟拓扑网络（STN-30p）、所选站的STN-30p衍生属性以及沿STN-30p的站间区域网格场。这些数据集代表了高分辨率的领域，对广泛的与水有关的研究具有价值，包括陆地建模、气候-大气相互作用和全球水资源评估。
[1] This paper demonstrates the potential of combining observed river discharge information with climate-driven water balance model (WBM) outputs to develop composite runoff fields. Such combined runoff fields simultaneously reflect the numerical accuracy of the discharge measurements and preserve the spatial and temporal distribution of simulated runoff. Selected gauging stations from the World Meteorological Organization Global Runoff Data Centre (GRDC) data archive were geographically coregistered to a gridded simulated topological network at 30 (longitude latitude) spatial resolution (STN-30p). Interstation regions between gauging stations along the STN-30p network were identified, and annual interstation runoff was calculated. The annual interstation runoff was compared with outputs from WBM calculations, which were performed using long-term mean monthly climate forcings (air temperature and precipitation). The simulated runoff for each cell was multiplied by the ratio of observed to simulated runoff of the corresponding interstation region from the GRDC data set to create spatially distributed runoff fields at 30 resolution. The resulting composite runoff fields (UNH/GRDC Composite Runoff Fields V1.0) are released to the scientific community along with intermediate data sets, such as station attributes and long-term monthly regimes of the selected gauging stations, the simulated topological network (STN-30p), STN-30p derived attributes for the selected stations, and gridded fields of the interstation regions along STN-30p. These data sets represent high-resolution fields that are of value to a broad range of water-related research, including terrestrial modeling, climate-atmosphere interactions, and global water resource assessments.