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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >River basin hydrology in a global off-line land-surface model
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River basin hydrology in a global off-line land-surface model

机译：全球离线陆面模型中的流域水文学

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摘要

Land-surface hydrology has been examined for the Off-line Land-surface GEOS Assimilation (OLGA) system and Goddard Earth Observing System (GEOS-1) data assimilation system using a river routing model. The GEOS-1 land-surface parameterization is very simple, using an energy balance prediction of surface temperature and prescribed soil water. OLGA uses atmospheric data from GEOS-1 to drive a more comprehensive parameterization of the land-surface processes. Using a global river routing model, OLGA's hydrology is evaluated against GEOS-1 (which serves as a control case) and observations. The river routing model moves monthly mean climatologic source runoff through river networks to simulate the river discharge from many river basins around the world, which can be compared to observed climatologic river discharge. Because of the soil hydrology, the OLGA system shows a general improvement in the simulation of river discharge, compared to the GEOS-1, by slowing the discharge of water. Snowmelt processes included in OLGA also have a positive effect on the annual cycle of river discharge and source runoff. The timing of the snowmelt in river discharge, however, still needs improvement in the annual cycle. Preliminary tests of a coupled land-atmosphere model indicate improvements to the hydrologic cycle compared to the uncoupled system. The river routing model has provided a useful tool in the evaluation of the GCM hydrologic cycle and has helped quantify the influence of the more advanced land-surface model.
机译：已使用河道模型对离线地表GEOS同化（OLGA）系统和Goddard地球观测系统（GEOS-1）数据同化系统的陆面水文学进行了研究。 GEOS-1地表参数化非常简单，使用地表温度和指定土壤水的能量平衡预测。 OLGA使用来自GEOS-1的大气数据来驱动陆面过程的更全面的参数化。使用全球河流路由模型，针对GEOS-1（作为控制案例）和观测数据对OLGA的水文学进行了评估。河道模型将每月平均气候源径流量通过河网移动，以模拟来自世界许多流域的河道流量，可以将其与观测到的气候河道流量进行比较。由于土壤的水文状况，与GEOS-1相比，OLGA系统通过放慢水的排放，在模拟河流排放方面显示出总体上的进步。 OLGA中包括的融雪过程也对河流流量和径流的年周期产生积极影响。然而，河道融雪的时间仍需要在年度周期中加以改进。土地-大气耦合模型的初步测试表明，与非耦合系统相比，水文循环得到了改善。河道模型为评估GCM水文循环提供了有用的工具，并有助于量化更先进的陆面模型的影响。

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