Large-scale Uncoupled Action Update

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Large-scale Uncoupled Action Update

• Paul Dirmeyer
• Taikan Oki

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Large-scale Uncoupled Action Update

• Paul Dirmeyer
• Taikan Oki

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GLASS Framework
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GRP
GMPP
GHP
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nd Global Soil Wetness Project

• Multi-model investigations into variability and
  predictability of the global
• surface water and energy cycles
• This phase of the project will take advantage of
• The10-year ISLSCP Initiative 2 data set
• The ALMA data standards developed in GLASS
• The infrastructure developed in the pilot phase
  of GSWP
• GSWP-2 represents an evolution in multi-model
  large-scale land-surface modeling with the
  following features
• The ten year length of the ISLSCP Initiative 2
  allows for a better investigation of interannual
  land surface climate variability.
• The ISLSCP Initiative 2 data set will contain
  more than one rendition of many global fields,
  produced by different methods and scientists.
  This gives us a straightforward means to
  investigate LSS sensitivity to the choice of
  forcing data sets.
• Application and further development of the
  methods of calibration and validation of LSSs
  with in situ and remote sensing data.

www.iges.org/gswp/ gswp_at_cola.iges.org
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GSWP-2 data sets
GSWP-2 data sets for parameter specification,
meteorological forcing, and validation have been
produced. The data sets are based on the
ISLSCP-Initiative II data, but many of the fields
represent additional processing, such as the
production of hybrid data sets combining
gridded observations (low temporal resolution)
with model reanalysis (high time resolution).
This hybridization removes systematic errors in
the reanalysis data, providing a superior set of
forcing data for the land surface models.
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GSWP Information System
Results will be made available to participants as
data sets accessible from one or more GrADS/DODS
servers (GDS). Using the ALMA data exchange
standards, and DODS subsetting capabilities,
individual LSSs will be able to run globally each
time step, each grid point from start to finish,
or in any other sequence of integration. Additiona
lly, standard and customizable browse images will
be made available to the public via the web.
ALMA www.lmd.jussieu.fr/ALMA/ DODS www.unidata.u
car.edu/packages/dods/ GDS grads.iges.org/grads
/gds/ LIS lis.gsfc.nasa.gov/
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Data servers
The data sets have been posted online for
community access. There are three DODS servers
for accessing the data directly over the
internet North America http//www.monsoondata.
org9090/dods/ Europe  http//dods.ipsl.jussieu.f
r/ Asia  http//ftp.tkl.iis.u-tokyo.ac.jp9090/d
ods/ The North American and Asian servers are
GDS. There is also FTP access to the individual
files at ftp//monsoondata.org/ (password
required) and direct
HTTP access to files at http//dods.ipsl.jussieu.
fr/
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DODS Access

• The DODS (now called OpenDAP) framework allows
  clients such as model codes, visualization
  software, or other programs to access large and
  varied data sets from servers on the internet,
  just as if they were accessing files on local
  computer disks (http//www.unidata.ucar.edu/packag
  es/dods/, http//opendap.org/).
• To use this new technology, some additional
  software must be installed on the clients home
  system (usually DODS-enabled libraries for
  existing software or compilers).
• An FAQ page has been set up to help GSWP
  participants with these and other issues at
  http//www.iges.org/gswp/faq.html.

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ICC

• Optical or Internet Submission
• Status (Taikan?)

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IIS-UT DB System

• 500TB HDS
• Receiving AVHRR, VISSR and MODIS
• GSWP DC
• Will be used for CEOP DC
• JMA GPV

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AMS 2004

• There will be a GSWP-2 session at the AMS 18th
  Conference on Hydrology, AMS Annual Meeting
  (Seattle, Washington, USA, 11-15 January 2004) to
  present preliminary results of the experiment.
• 12 Abstracts submitted to GSWP-2 session.
  Scheduling now underway.

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GRP/GMPP exchange via GSWP-2

• Plans are being made for a collaborative effort
  between GRP and GMPP.
• Bill Rossow has been communicating with Paul
  Dirmeyer and Jan Polcher about using GSWP
  estimates of surface (latent and sensible) heat
  fluxes over land for helping to close the global
  surface energy budget.
• GSWP will also pursue sensitivity studies using
  ISCCP estimates of surface radiation for model
  forcing, compared to SRB and reanalysis
  estimates, to understand how uncertainty in our
  estimates of radiation propagate into the
  terrestrial hydrologic cycle.

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Validation issues in GSWP-2
Preliminary work at COLA

• Assessment of in situ data
• Assessing existing global data sets
• Remote sensing efforts

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SCANt

• Very few operational stations during 1994-95
• Data unreliable before 1997

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Soil Wetness
In situ measurements
Global Soil Moisture Data Bank

• Very few and scattered soil wetness measurements.
  Some of the best long-term networks have decayed
  in last decade. Still gaps.

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Comparison of existing global data sets
Long-term model-derived and remote sensing
products
1992-
1988-
1979-1999
1979-
1948-
1950-1999
Product Summary Willmott Matsuuma Huang van den Dool Dirmeyer and Tan Kanamitsu et al. Basist et al. Wagner et al.
WM CPC GOLD R2 SSM/I ERS
LSS / Sensor Modified Bucket Uncoupled Leaky Bucket Uncoupled SSiB Uncoupled Pan Mahrt Coupled SSM/I ERS Scaterometer
Horizontal resolution 0.5 0.5 1.875 1.875x1.915 0.3º 28km
Surface soil moisture capacity N/A N/A 20-23mm 43mm Surface water index 10mm
Column available soil moisture 150mm 760mm 322-1125mm (varies spatially) 857mm N/A N/A
Meteorological Inputs Monthly precipitation and temperature Daily precipitation and temperature 6-hourly precipitation, radiation, temperature, winds, humidity coupled to GCM integrated in data assimilation mode
No data 6/1990-12/1991
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Surface soil wetness

• ERS product much better than SSM/I (which is
  really a surface water product, even though it is
  called a soil wetness index).
• R2 performs poorly for sfc SW as well.
• Data for China and Mongolia do not overlap the
  ERS period (1992-).

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Top 1m soil wetness

• R2 is clearly inferior.
• Other products have strong/weak regions

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Performance of various products

• For anomalies, CPC product appears best for
  column soil wetness, GOLD (GSWP-style) is 2nd.
• GOLD is better on total signal (better phasing of
  annual cycle).
• ERS is very good, but only available for surface,
  and record is shortest of all products.

Sfc
1m
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Finally

• 15 September deadline for baseline runs will
  probably slip to October.
• Start on QC, comparison, and test cases this
  Fall.
• Public presentation of preliminary results at AMS
  (Seattle, Jan 2004).