期刊
JOURNAL OF HYDROMETEOROLOGY
卷 20, 期 8, 页码 1533-1552出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/JHM-D-18-0086.1
关键词
Water budget; balance; Numerical weather prediction; forecasting; Data assimilation; Land surface model
资金
- Wilkie Calvert Co-Supported PhD Studentships at the University of Reading
- Copernicus Emergency Management Service - Early Warning Systems [CEMS-EWS (EFAS)]
- TENDERLY project: Towards END-to End flood forecasting and a tool for ReaL-time catchment susceptibility U.K. NERC Flooding From Intense Rainfall (FFIR) programme [NE/K00896X/1]
- FATHUM project: Forecasts for AnTicipatory HUManitarian Action - U.K. NERC as part of their Science for Humanitarian Emergencies and Resilience (SHEAR) programme [NE/P000525/1]
- NERC [NE/K00896X/1, NE/P000525/1] Funding Source: UKRI
Land surface models (LSMs) have traditionally been designed to focus on providing lower-boundary conditions to the atmosphere with less focus on hydrological processes. State-of-the-art application of LSMs includes a land data assimilation system (LDAS), which incorporates available land surface observations to provide an improved realism of surface conditions. While improved representations of the surface variables (such as soil moisture and snow depth) make LDAS an essential component of any numerical weather prediction (NWP) system, the related increments remove or add water, potentially having a negative impact on the simulated hydrological cycle by opening the water budget. This paper focuses on evaluating how well global NWP configurations are able to support hydrological applications, in addition to the traditional weather forecasting. River discharge simulations from two climatological reanalyses are compared: one online set, which includes land-atmosphere coupling and LDAS with an open water budget, and an offline set with a closed water budget and no LDAS. It was found that while the online version of the model largely improves temperature and snow depth conditions, it causes poorer representation of peak river flow, particularly in snowmelt-dominated areas in the high latitudes. Without addressing such issues there will never be confidence in using LSMs for hydrological forecasting applications across the globe. This type of analysis should be used to diagnose where improvements need to be made; considering the whole Earth system in the data assimilation and coupling developments is critical for moving toward the goal of holistic Earth system approaches.
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