Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-017-3820-9 |
Impact of a shallow groundwater table on the global water cycle in the IPSL land-atmosphere coupled model | |
Wang, Fuxing1; Ducharne, Agnes2; Cheruy, Frederique1; Lo, Min-Hui3; Grandpeix, Jean-Yves1 | |
2018-05-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 50页码:3505-3522 |
文章类型 | Article |
语种 | 英语 |
国家 | France; Taiwan |
英文摘要 | The main objective of the present work is to study the impacts of water table depth on the near surface climate and the physical mechanisms responsible for these impacts through the analysis of land-atmosphere coupled numerical simulations. The analysis is performed with the LMDZ (standard physics) and ORCHIDEE models, which are the atmosphere-land components of the Institut Pierre Simon Laplace (IPSL) Climate Model. The results of sensitivity experiments with groundwater tables (WT) prescribed at depths of 1 m (WTD1) and 2 m (WTD2) are compared to the results of a reference simulation with free drainage from an unsaturated 2 m soil (REF). The response of the atmosphere to the prescribed WT is mostly concentrated over land, and the largest differences in precipitation and evaporation are found between REF and WTD1. Saturating the bottom half of the soil in WTD1 induces a systematic increase of soil moisture across the continents. Evapotranspiration (ET) increases over water-limited regimes due to increased soil moisture, but it decreases over energy-limited regimes due to the decrease in downwelling radiation and the increase in cloud cover. The tropical (25A degrees S-25A degrees N) and mid-latitude areas (25A degrees N-60A degrees N and 25A degrees S-60A degrees S) are significantly impacted by the WT, showing a decrease in air temperature (-0.5 K over mid-latitudes and -1 K over tropics) and an increase in precipitation. The latter can be explained by more vigorous updrafts due to an increased meridional temperature gradient between the equator and higher latitudes, which transports more water vapour upward, causing a positive precipitation change in the ascending branch. Over the West African Monsoon and Australian Monsoon regions, the precipitation changes in both intensity (increases) and location (poleward). The more intense convection and the change of the large-scale dynamics are responsible for this change. Transition zones, such as the Mediterranean area and central North America, are also impacted, with strengthened convection resulting from increased ET. |
英文关键词 | Groundwater table Land-atmosphere Near surface climate IPSL-CM West African Monsoon |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000429650700020 |
WOS关键词 | GENERAL-CIRCULATION MODEL ; CLIMATE-CHANGE ; SOIL-MOISTURE ; CMIP5 SIMULATIONS ; SURFACE PROCESSES ; HYDRAULIC CONDUCTIVITY ; CUMULUS CONVECTION ; HOLDING CAPACITY ; SENSITIVITY ; IRRIGATION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35698 |
专题 | 气候变化 |
作者单位 | 1.UPMC, Sorbonne Univ, CNRS, Lab Meteorol Dynam,IPSL, F-75005 Paris, France; 2.UPMC, Sorbonne Univ, CNRS, UMR 7619,EPHE,METIS, 4 Pl Jussieu, F-75005 Paris, France; 3.Natl Taiwan Univ, Dept Atmospher Sci, Taipei, Taiwan |
推荐引用方式 GB/T 7714 | Wang, Fuxing,Ducharne, Agnes,Cheruy, Frederique,et al. Impact of a shallow groundwater table on the global water cycle in the IPSL land-atmosphere coupled model[J]. CLIMATE DYNAMICS,2018,50:3505-3522. |
APA | Wang, Fuxing,Ducharne, Agnes,Cheruy, Frederique,Lo, Min-Hui,&Grandpeix, Jean-Yves.(2018).Impact of a shallow groundwater table on the global water cycle in the IPSL land-atmosphere coupled model.CLIMATE DYNAMICS,50,3505-3522. |
MLA | Wang, Fuxing,et al."Impact of a shallow groundwater table on the global water cycle in the IPSL land-atmosphere coupled model".CLIMATE DYNAMICS 50(2018):3505-3522. |
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