DOI: 10.5194/hess-21-377-2017
Scopus记录号: 2-s2.0-85010303867
论文题名: Satellite-derived light extinction coefficient and its impact on thermal structure simulations in a 1-D lake model
作者: Zolfaghari K ; , Duguay C ; R ; , Kheyrollah Pour H
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 1 起始页码: 377
结束页码: 391
语种: 英语
Scopus关键词: Light extinction
; Meteorology
; Satellite imagery
; Satellites
; Sensitivity analysis
; Surface waters
; Temperature
; Extinction coefficients
; Fresh water lakes
; Light extinction coefficients
; Meteorological station
; Mixed layer depths
; Simulation outputs
; Surface water temperature
; Thermal structure
; Lakes
; algorithm
; bottom water
; extinction coefficient
; MERIS
; satellite imagery
; sensitivity analysis
; thermal regime
; thermal structure
; water column
; water temperature
; Great Lakes [North America]
; Lake Erie
英文摘要: A global constant value of the extinction coefficient (Kd) is usually specified in lake models to parameterize water clarity. This study aimed to improve the performance of the 1-D freshwater lake (FLake) model using satellite-derived Kd for Lake Erie. The CoastColour algorithm was applied to MERIS satellite imagery to estimate Kd. The constant (0.2m1) and satellite-derived Kd values as well as radiation fluxes and meteorological station observations were then used to run FLake for a meteorological station on Lake Erie. Results improved compared to using the constant Kd value (0.2m1). No significant improvement was found in FLake-simulated lake surface water temperature (LSWT) when Kd variations in time were considered using a monthly average. Therefore, results suggest that a timeindependent, lake-specific, and constant satellite-derived Kd value can reproduce LSWT with sufficient accuracy for the Lake Erie station. A sensitivity analysis was also performed to assess the impact of various Kd values on the simulation outputs. Results show that FLake is sensitive to variations in Kd to estimate the thermal structure of Lake Erie. Dark waters result in warmer spring and colder fall temperatures compared to clear waters. Dark waters always produce colder mean water column temperature (MWCT) and lake bottom water temperature (LBWT), shallower mixed layer depth (MLD), longer ice cover duration, and thicker ice. The sensitivity of FLake to Kd variations was more pronounced in the simulation of MWCT, LBWT, and MLD. The model was particularly sensitive to Kd values below 0.5m-1. This is the first study to assess the value of integrating Kd from the satellite-based CoastColour algorithm into the FLake model. Satellite-derived Kd is found to be a useful input parameter for simulations with FLake and possibly other lake models, and it has potential for applicability to other lakes where Kd is not commonly measured. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79287
Appears in Collections: 气候变化事实与影响
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作者单位: Interdisciplinary Centre on Climate Change, Department of Geography and Environmental Management, University of Waterloo, Waterloo, Canada
Recommended Citation:
Zolfaghari K,, Duguay C,R,et al. Satellite-derived light extinction coefficient and its impact on thermal structure simulations in a 1-D lake model[J]. Hydrology and Earth System Sciences,2017-01-01,21(1)