1 NCEP Production Suite Review: “Land Surface Guidance Systems” EMC Land-Hydrology Team: Michael Ek, Jesse Meng, Rongqian Yang, Helin Wei, Youlong Xia,

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Presentation transcript:

1 NCEP Production Suite Review: “Land Surface Guidance Systems” EMC Land-Hydrology Team: Michael Ek, Jesse Meng, Rongqian Yang, Helin Wei, Youlong Xia, Yihua Wu, Weizhong Zheng, Jiarui Dong Environmental Modeling Center (EMC) National Centers for Environmental Prediction (NCEP) NOAA/NWS NCEP Production Suite Review, 3-5 December 2013 NOAA Center for Weather and Climate Prediction, College Park, Maryland

2 Noah land model has relevant land physics & assoc. land data sets, & provides lower boundary conditions (heat, moisture, momentum) for NAM, GFS, CFS. NCEP-NCAR unified Noah land model

3 Uncoupled “NLDAS” (drought) Air Quality WRF NMM/ARW Workstation WRF WRF: ARW, NMM ETA, RSM Satellites 99.9% Regional NAM WRF NMM (including NARR) Hurricane GFDL HWRF Global Forecast System Dispersion ARL/HYSPLIT For eca st Severe Weather Rapid Update for Aviation (ARW-based) Climate CFS 1.7B Obs/Day Short-Range Ensemble Forecast Noah Land Model Connections in NOAA’s NWS Model Production Suite MOM3 2-Way Coupled Oceans HYCOM WaveWatch III NAM/CMAQ Regional Data Assimilation Global Data Assimilation North American Ensemble Forecast System GFS, Canadian Global Model NOAH Land Surface Model NCEP- NCAR unified Uncoupled “GLDAS”

Land model validation Low-level observations (e.g. 2-m temperature & humidity, 10-m winds); multi-year “fvs” data set. July monthly diurnal 10-m wind (m/s) hr obs: solid, NAM: short-dash, GFS: long-dash eastwest hr Z Forecast Cycle Additionally: upper air scores, precipitation threat & bias scores, 500mb hgt AC, surface flux sites, etc. NEW: separate land-use category (global domain).

Near-term upgrades Surface-layer changes: addresses low-level T2m and wind biases via adjustment to momentum roughness for some land-use/vegetation categories, thermal roughness effect over snow. Precipitation: new snow fall algorithm that uses NAM microphysics that accounts for mixed-phase precipitation (liquid and frozen) and riming factor, so increases snow density, reduces snow depth. GFS Surface-layer changes: addresses low-level T2m via momentum roughness adjustments (generally lower) and thermal roughness dependent on land-use/vegetation category. Land-use/veg type and soil type: new higher-resolution. Soil moisture nudging: new soil moist. climatology. NAM 5

July 2011 North American Land Data Assimilation System (NLDAS) Ensemble monthly soil moisture anomaly July 30-year climo. FY14Q1 transition to ops: 4 land models run uncoupled, driven by CPC obs precip & atmos forcing from NCEP N. Amer. Reg. Climate Data Assimil Sys. Output: 1/8-deg. land & soil states, surface fluxes, runoff & streamflow; anomalies compared with climatologies from 30-year land model runs. Drought: monitoring & seasonal hydrological forecasting for CPC/NIDIS; future global domain. Daily streamflow September

Future upgrades Unified Noah land model across NCEP systems. Global Land Data Assimilation System (GLDAS): higher-resolution that “feeds” (via upscaling) initial conditions to NAM, GFS, CFS --> NEMS. Improved land data sets: e.g. realtime GVF. “Formal” Land Data Assimilation: Snow, soil moisture, land skin temp, veg (cover, density). Freshwater lakes, add’l fire-related upgrades. Steamflow: River-routing scheme moves water to sea; more complete atmos, land, hydrology, ocean connection, i.e. Earth System Modeling. Upgraded “Noah-MP” physics: explicit plant canopy, CO2-based photosynthesis, dynamic veg., multi-layer snowpack, groundwater. NAM, GFS, CFS 7

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