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Task 5: Supporting the installation and testing of the NCAR HRLDAS

Task 5: Supporting the installation and testing of the NCAR HRLDAS. Michael Barlage, Fei Chen. Motivation for HRLDAS over Taiwan. GDAS Soil Moisture. HRLDAS Soil Moisture. 5.1 Lecture and training. Fei Chen and Mike Barlage visited CWB from 23Mar to 02Apr Itinerary of visit:

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Task 5: Supporting the installation and testing of the NCAR HRLDAS

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  1. Task 5: Supporting the installation and testing of the NCAR HRLDAS Michael Barlage, Fei Chen

  2. Motivation for HRLDAS over Taiwan GDAS Soil Moisture HRLDAS Soil Moisture

  3. 5.1 Lecture and training • Fei Chen and Mike Barlage visited CWB from 23Mar to 02Apr • Itinerary of visit: Day 1: discuss HRLDAS/CWB plans(Fei Chen, Jing-Shan Hong, Mike Barlage) Day 2: Fei Chen gives seminar on land surface modeling Day 3: Tutorial on uses and code structure of HRLDAS Day 4: Tutorial on code structure of Noah, domain independent datasets for HRLDAS Day 5: Tutorial on CWB domain-specific input datasets; HRLDAS namelist Day 6: Execution of HRLDAS; customizing output; using MODIS data • NCAR provided HRLDAS code, input data, scripts to convert data and execute HRLDAS

  4. 5.1 Lecture and training • Participants of tutorial included CWB staff and several students from National Central Univ. and National Taiwan Normal Univ.

  5. 5.2 Implementation, test and evaluate offline HRLDAS • HRLDAS compiled and running on CWB IBM • Six-week simulation with data provided during tutorial was executed on CWB IBM and produced the same result as simulation executed on NCAR IBM • First time HRLDAS used outside United States domain • Original HRLDAS presented to CWB used WRF WPS as a means to get several data sources and formats into HRLDAS input format

  6. 5.2 Implementation, test and evaluate offline HRLDAS NCAR IBM NCAR IBM - CWB IBM CWB IBM NCAR IBM - NCAR Linux

  7. 5.2 Implementation, test and evaluate offline HRLDAS • After testing for applicability outside U.S., transferred to the standard HRLDAS for simplicity and ease of updates • Requires getting all HRLDAS forcing data onto standard lat-lon grids in GRIB format (HRLDAS will accept more grids in future) • Overcame complications in GRIB data storage never before used in HRLDAS • HRLDAS modified to use CWB WRF output directly • CWB performing 6-month simulation using WRF forcing, GDAS initialization, GDAS snow, CMORPH/Taiwan precip • As a parallel effort, NCAR has performed a similar 3-month simulation using all NCEP GFS data

  8. 5.3 Ingest Taiwan local data in HRLDAS • CWB precipitation observations at 5km resolution over Taiwan are being assimilated into HRLDAS where possible. In areas outside of Taiwan, CMORPH precipitation is used. • Observations from ~10 flux stations will be used for validation

  9. 5.4 Consultation/technical support • Changes have been made to the original HRLDAS system presented in March to make it more streamlined for CWB operations • HRLDAS was modified to accept WRF input directly • Effort has been made to modify HRLDAS to accept data more easily to accommodate potential inputs from CWB • With Skype calls and several email communications, we have tracked down bugs in the code and errors in data processing. • Discussions have begun regarding the use of MODIS observations of land surface parameters into CWB HRLDAS

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