North American Regional Climate Simulations with WRF/Noah-MP: Validation and the effect of groundwater interaction Michael Barlage Mukul Tewari, Fei Chen, Kevin Manning (NCAR) Gonzalo Miguez-Macho (U. Santiago) 14 th WRF Users’ Workshop, 26 June 2013
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Michael Barlage Mukul Tewari , Fei Chen, Kevin Manning (NCAR)
North American Regional Climate Simulations with WRF/Noah-MP: Validation and the effect of groundwater interaction. Michael Barlage Mukul Tewari , Fei Chen, Kevin Manning (NCAR) Gonzalo Miguez -Macho (U. Santiago) 14 th WRF Users’ Workshop, 26 June 2013. Domain and Setup. - PowerPoint PPT Presentation
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North American Regional Climate Simulations with WRF/Noah-MP:
Validation and the effect of groundwater interaction
Michael Barlage Mukul Tewari, Fei Chen, Kevin Manning (NCAR)
Gonzalo Miguez-Macho (U. Santiago)
14th WRF Users’ Workshop, 26 June 2013
Domain and Setup
• Two six-month 30km simulations starting Feb 25
• 2002 and 2010• Spin-up soil for one
year using offline HRLDAS
• IC/BC from NARR• CAM radiation; YSU;
Thompson
LSM Setup• Default Noah LSM• Noah-MP with OPT_RUN=3: free drainage
comparable to Noah runoff scheme• Noah-MP with OPT_RUN=5: Miguez-Macho & Fan
groundwater with equilibrium water table• Noah-MP with OPT_BTR=1(Noah) and 2 (CLM)
0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.450
0.10.20.30.40.50.60.70.80.9
1
NoahCLM
Soil Saturation
Tran
spira
tion
Effici
ency
Equations:Mass balance in groundwater storage:
Darcy’s Law for groundwater – river exchange:
Darcy’s Law for lateral groundwater flow:
shhwQ nwtdwtd n dzKdzKn
n 2
width of flow cross section
TransmisivityHead difference divided by distance (water table slope)
conductivity
wi,j i, j
Q1Q2 Q3
Q4
Q5Q6Q7
Q8Plan view
h i,j
Mean sea level
Sg
Q8Q4
R Qr
Cell ij
Cross section view
Miguez-Macho & Fan water table dynamics in NOAH-MP
Summary• Tested a new groundwater option to Noah-MP that
accounts for aquifer interaction • Noah-MP performs better than Noah for near surface
temperature (with exceptions), though more optimization is likely required
• Noah-MP performs the same (2002) or regionally worse (2010) for precipitation
• In regions with low water table depth, upward transport of water:– Increases late summer latent heat flux– Has little effect on precipitation– Improves surface temperature simulation