DOI: 10.5194/hess-18-2955-2014
Scopus记录号: 2-s2.0-84925837020
论文题名: A global water cycle reanalysis (2003-2012) merging satellite gravimetry and altimetry observations with a hydrological multi-model ensemble
作者: Van Dijk A ; I ; J ; M ; , Renzullo L ; J ; , Wada Y ; , Tregoning P
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 8 起始页码: 2955
结束页码: 2973
语种: 英语
Scopus关键词: Budget control
; Errors
; Geodetic satellites
; Groundwater
; Hydrology
; Snow
; Surface waters
; Water levels
; Collocation techniques
; Gravity recovery and climate experiment satellites
; Groundwater depletion
; Hydrological models
; Multi-model ensemble
; Satellite gravimetries
; Surface water body
; Uncertainty informations
; Uncertainty analysis
; data assimilation
; GRACE
; gravimetry
; hydrological cycle
; ice cap
; numerical model
; satellite altimetry
; satellite imagery
; water level
; South America
; Southern Africa
英文摘要: We present a global water cycle reanalysis that merges water balance estimates derived from the Gravity Recovery And Climate Experiment (GRACE) satellite mission, satellite water level altimetry and off-line estimates from several hydrological models. Error estimates for the sequential data assimilation scheme were derived from available uncertainty information and the triple collocation technique. Errors in four GRACE storage products were estimated to be 11-12 mm over land areas, while errors in monthly storage changes derived from five global hydrological models were estimated to be 17-28 mm. Prior and posterior water storage estimates were evaluated against independent observations of river water level and discharge, snow water storage and glacier mass loss. Data assimilation improved or maintained agreement overall, although results varied regionally. Uncertainties were greatest in regions where glacier mass loss and subsurface storage decline are both plausible but poorly constrained. We calculated a global water budget for 2003-2012. The main changes were a net loss of polar ice caps (-342 Gt yr -1) and mountain glaciers (-230 Gt yr-1), with an additional decrease in seasonal snowpack (-18 Gt yr-1). Storage increased due to new impoundments (+16 Gt yr-1), but this was compensated by decreases in other surface water bodies (-10 Gt yr-1). If the effect of groundwater depletion (-92 Gt yr-1) is considered separately, subsurface water storage increased by +202 Gt yr-1 due particularly to increased wetness in northern temperate regions and in the seasonally wet tropics of South America and southern Africa. The reanalysis results are publicly available via www.wenfo.org/wald/. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78172
Appears in Collections: 气候变化事实与影响
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作者单位: Fenner School of Environment and Society, Australian National University, Canberra, ACT, Australia; CSIRO Land and Water, Canberra, ACT, Australia; Department of Physical Geography, Utrecht University, Utrecht, Netherlands; Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia
Recommended Citation:
Van Dijk A,I,J,et al. A global water cycle reanalysis (2003-2012) merging satellite gravimetry and altimetry observations with a hydrological multi-model ensemble[J]. Hydrology and Earth System Sciences,2014-01-01,18(8)