气候变化领域集成服务门户(CCPortal): Modelling sub-grid wetland in the ORCHIDEE global land surface model: evaluation against river discharges and remotely sensed data

CCPortal

DOI	10.5194/gmd-5-941-2012
	Modelling sub-grid wetland in the ORCHIDEE global land surface model: evaluation against river discharges and remotely sensed data
	Ringeval, B.; Decharme, B.; Piao, S. L.; Ciais, P.; Papa, F.; de Noblet-Ducoudre, N.; Prigent, C.; Friedlingstein, P.; Gouttevin, I.; Koven, C.; Ducharne, A.
通讯作者	Ringeval, B (通讯作者)
发表日期	2012
ISSN	1991-959X
EISSN	1991-9603
起始页码	941
结束页码	962
卷号	5 期号:4
英文摘要	The quality of the global hydrological simulations performed by land surface models (LSMs) strongly depends on processes that occur at unresolved spatial scales. Approaches such as TOPMODEL have been developed, which allow soil moisture redistribution within each grid-cell, based upon sub-grid scale topography. Moreover, the coupling between TOPMODEL and a LSM appears as a potential way to simulate wetland extent dynamic and its sensitivity to climate, a recently identified research problem for biogeochemical modelling, including methane emissions. Global evaluation of the coupling between TOPMODEL and an LSM is difficult, and prior attempts have been indirect, based on the evaluation of the simulated river flow. This study presents a new way to evaluate this coupling, within the ORCHIDEE LSM, using remote sensing data of inundated areas. Because of differences in nature between the satellite derived information - inundation extent - and the variable diagnosed by TOPMODEL/ORCHIDEE - area at maximum soil water content, the evaluation focuses on the spatial distribution of these two quantities as well as on their temporal variation. Despite some difficulties in exactly matching observed localized inundated events, we obtain a rather good agreement in the distribution of these two quantities at a global scale. Floodplains are not accounted for in the model, and this is a major limitation. The difficulty of reproducing the year-to-year variability of the observed inundated area (for instance, the decreasing trend by the end of 90s) is also underlined. Classical indirect evaluation based on comparison between simulated and observed river flow is also performed and underlines difficulties to simulate river flow after coupling with TOPMODEL. The relationship between inundation and river flow at the basin scale in the model is analyzed, using both methods (evaluation against remote sensing data and river flow). Finally, we discuss the potential of the TOPMODEL/LSM coupling to simulate wetland areas. A major limitation of the coupling for this purpose is linked to its ability to simulate a global wetland coverage consistent with the commonly used datasets. However, it seems to be a good opportunity to account for the wetland areas sensitivity to the climate and thus to simulate its temporal variability.
关键词	CATCHMENT-BASED APPROACH SOIL-MOISTURE NATURAL WETLANDS ATMOSPHERIC TRANSPORT BIOGEOCHEMISTRY MODEL METHANE EMISSIONS CONTINENTAL-SCALE VEGETATION MODEL BOREAL CLIMATE WATER
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000308244900002
来源期刊	GEOSCIENTIFIC MODEL DEVELOPMENT
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258094
推荐引用方式 GB/T 7714	Ringeval, B.,Decharme, B.,Piao, S. L.,et al. Modelling sub-grid wetland in the ORCHIDEE global land surface model: evaluation against river discharges and remotely sensed data[J]. 中国科学院青藏高原研究所,2012,5(4).
APA	Ringeval, B..,Decharme, B..,Piao, S. L..,Ciais, P..,Papa, F..,...&Ducharne, A..(2012).Modelling sub-grid wetland in the ORCHIDEE global land surface model: evaluation against river discharges and remotely sensed data.GEOSCIENTIFIC MODEL DEVELOPMENT,5(4).
MLA	Ringeval, B.,et al."Modelling sub-grid wetland in the ORCHIDEE global land surface model: evaluation against river discharges and remotely sensed data".GEOSCIENTIFIC MODEL DEVELOPMENT 5.4(2012).