WCR: Quantifying Fresh Water Fluxes, Runoff and Precipitation in the Global Water Cycle and Applying Them to Evaluate the Community Climate System Model (CCSM)

水循环研究(WCR)项目旨在确定不同水库之间的水流量，以便量化全球水循环。量化对于理解物理过程、表征水气候的可变性和变化以及评估气候模型是必要的。Dai和co-Pi Trenberth(都在NCAR)将努力从大气水收支和大陆淡水排放中量化降水量、强度和频率以及蒸发量；将分析来自8000多个站的全球径流记录。研究结果应有助于人们更好地了解水循环的基本组成部分，特别是径流、河流流量、地表净水通量和海洋淡水输送。这项工作应改进对水通量和流域间输送年际和年代际变化的描述。由于模型的主要不足之处与水循环的各个方面有关，PIS预计他们将努力推进气候模型的开发。这项研究应改进区域和大陆尺度上的水气候变异性和变化的建模和预测。这项工作对在气候变化和多变性背景下研究水循环科学的广大气候科学家群体具有潜在的益处。此外，这项研究的信息将改善气候模型及其预测未来气候的能力，这是对与环境有关的社会问题的重要贡献。

This Water Cycle Research (WCR) project seeks to determine the flux of water between various reservoirs, in order to quantify the global water cycle. The quantification is necessary for understanding the physical processes, characterization of hydroclimate variability and change, and for evaluation of climate models. Dai and co-PI Trenberth (both at NCAR) will strive to quantify the precipitation amounts, intensity and frequency, and evaporation, from atmospheric water budgets and fresh water discharges from the continents; global streamflow records from over 8000 stations will be analyzed. The results should improve understanding of the fundamental components of the water cycle, especially, runoff, river discharge, net surface water fluxes, and oceanic freshwater transport. The effort should lead to improved characterization of the interannual and decadal variabilities of the water fluxes, and of inter-basin transports. The PIs expect their efforts to advance climate model development since the major model deficiencies are related to aspects of the water cycle. The research should lead to improved modeling and prediction of hydroclimate variability and change, on both regional and continental scales. This work is of potential benefit to the broad community of climate scientists studying water cycle science in the context of climate change and variability. Moreover, the information from this research will improve climate models and their ability to project future climates, an important contribution to societal issues concerned with the environment.