meeting.2.8.99.shtml

LDAS Meeting Minutes

November 6th, 2000, NASA-GSFC

Next LDAS Meeting set for 1pm on 12/6/00 at OH
Updated LDAS Contact List:

Core Group:

Adam Schlosser <adam@cola.iges.org>,

Alan Robock <robock@envsci.rutgers.edu>,

Brian Cosgrove <brian.cosgrove@gsfc.nasa.gov>,

Dan Tarpley <dan.tarpley@noaa.gov>,

David Toll <david.l.toll.1@gsfc.nasa.gov>,

Dennis Lettenmaier <dennisl@u.washington.edu>,

Dag Lohmann <dlohmann@ncep.noaa.gov>,

Eric Wood <efwood@princeton.edu>,

Hua-lu Pan < hua-lu.Pan@noaa.gov>,

Jared Entin <jentin@dao.gsfc.nasa.gov>,

John Schaake <john.schaake@noaa.gov>,

Justin Sheffield <justin@princeton.edu>,

Ken Mitchell <kenneth.mitchell@noaa.gov>,

Konstantin Vinnikov <kostya@atmos.umd.edu>,

Lifeng Luo <luo@envsci.rutgers.edu>,

Matt Rodell <mattro@dao.gsfc.nasa.gov>,

Paul Dirmeyer <dirmeyer@cola.iges.org>,

Paul Houser <houser@dao.gsfc.nasa.gov>,

Qingyun Duan <Qingyun.Duan@noaa.gov>,

Rachel Pinker <pinker@metosrv2.umd.edu>,

Wayne Higgins <Wayne.Higgins@noaa.gov>

Additional Parties:

Ben Felzer <felzer@ncar.ucar.edu>,

Jerry Brotzge <jbrotzge@ou.edu>,

Christa Peters-Lidard <cpeters@ce.gatech.edu>,

Curtis Marshall <cmarshall@ncep.noaa.gov>,

Dave Matthews <dmatthews@do.usbr.gov>,

Don Kline <don@nws.gov>,

Geoff DiMego <geoff.dimego@noaa.gov>,

George Smith <george.smith@noaa.gov>,

Huug Vandendool <wd51hd@ncep.noaa.gov>,

Jeff Basara <jbasara@ou.edu>,

Jim Shuttleworth <shuttle@hwr.arizona.edu>,

Jin Huang <wd51hd@ncep.noaa.gov>,

Ken Crawford <kcrawford@ou.edu>,

Luis Bastidas <lucho@hwr.arizona.edu>

Michael Ek <mek@ncep.noaa.gov>,

Michael Smith <michael.smith@noaa.gov>,

Mike Jasinski <mike@hydromet.gsfc.nasa.gov>,

Radhika Wijetunge <rwijetun@princeton.edu>,

Randy Koster <randy@janus.gsfc.nasa.gov>,

Rick Lawford <lawford@ogp.noaa.gov>,

Soroosh Sorooshian <soroosh@hwr.arizona.edu>,

Stephen Lord <stephen.lord@noaa.gov>,

Venkataraman Lakshmi <venkat@spectra.gsfc.nasa.gov>,

Victor Koren <victor.koren@noaa.gov>,

Vijay Gupta <gupta@cses.colorado.edu>

Real-time Model Run (at NCEP) Update:

Mosaic, NOAH and Vic are all running in real-time at NCEP. Sacramento model should be running in real-time after one more visit to NCEP by OH.
NCEP is facing a serious shortage of disk space.

Output from models should be in GRIB. WGRIB software may be used to decrease size of output files until disk space issue is resolved.
CLM real-time run at NCEP is postponed for now, but may still allow guest model to participate.

GRIB Output Update:

Dag has finished work on GRIB output subroutine. Explained code structure at meeting.
Space savings is a factor of 3 or 4 over binary files.
Soil layer thickness is a fixed field and should not be output in hourly GRIB files.

LDAS Forcing Issues:

Relative humidity problems (RH's over 100%) in NCEP forcing data found by Washington-Princeton need to be examined further.

NCEP found that differences in saturation vapor pressure curves are not the cause of the problem.
Washington-Princeton should send information to NCEP regarding the day and time of these RH errors, and should also send NCEP their vapor pressure deficit formulas.

NCEP may want to use the SiB-UMD vegetation mapping fractions derived by Brian in their modeling efforts. A comparison should be performed between their current parameters and parameters derived from Brian's mapping process. See below for NCEP's vegetation mapping program.
LDAS groups should be using Yun's new land/sea mask (which depicts US/Canada/Mexico) for precipitation forcing. Brian will email Yun new LDAS mask which includes more land points, and Yun will derive new land/sea mask which depicts Canada, Mexico and the United States.
Goddard will reprocess forcing data, but issues need to be resolved first: Wayne Higgins needs to reprocess 24hr guage data, and RUC vs. EDAS usage needs to be decided. Goddard may add RUC option into model driver.
Biases are present in 10 meter ETA winds. Started after Cray fire.
RUC temperatures are approximately equivalent to ETA data, RH and winds are a little better than ETA.

Validation Update:

All LDAS models should rerun July 2000 and send to Alan at Rutgers for validation effort as soon as possible.

LDAS Model Re-runs:

All LDAS groups should re-run their models starting in April of 1999 to make use of quality controlled forcing. Models should spin up for 1 year from April 1999 until April 2000, and then should start running in April 1999 until the present.
Model runs will be performed at NCEP.
EDAS soil temperatures should be used
Soil conditions should be saturated at startup.

Princeton Model Run Logistics:

VIC model code should only reside in one directory on NCEP machine. Crontab for cronjob will point to one directory which will contain this operational model code. Princeton and Dag need to work together to keep model running.

River Basins:

Streamflow data is available from 6/21/2000 until present.
Information from Dag about validation basins, USGS gage numbers and gage names can be found at:

http://lnx69.ncep.noaa.gov/LDAS/MEETINGS/MEETING20000915/plot_basinsSept2000.gif

http://lnx69.ncep.noaa.gov/LDAS/MEETINGS/MEETING20001106/selected_subset.txt

Eric noted that the sites listed on NCEP website appear to be real-time sites and not the ~200 sites that John Schaake identified for LDAS work. Dag will address this issue.

COLA Update:

COLA is looking at January 2001 approximate timeframe to get system up and running.

GLDAS update:

Two grid for use with GLDAS have been defined
Ken gave Agromet presentation