Review of NAEFS Variables

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Review of NAEFS Variables

• NAEFS workshop Oct 6-8 2008, NCEP
• Lewis Poulin, MSC-CMC
• Implementation. and Operational services
• lewis.poulin_at_ec.gc.ca
• With information and assistance provided by
• Normand Gagnon, MSC-CMC
• Dick Wobus, Yuejian Zhu, NCEP

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Latest set of NAEFS expanded dataset (October
2008)
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NAEFS expanded variables dataset
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Managing NAEFS variables - some considerations

• How will increase in no. of variables impact file
  sizes, operational timings?
• If timings are impacted
• High and low priority variables?
• High and low priority exchange files?
• Delay products because we are waiting for low
  priority variables?
• Manage differences for same variables between
  centers
• Variables covering different intervals between
  centers
• Ex APCP, Flux (CMC cumulative, NCEP /6 hour)
• TCLD (CMC Instant cloud cover, NCEP 6 hour
  average)
• Do we want variables to converge to same
  definitions (eventually) for all centers
• Consistency of coding in GRIB2 between centers
• Testing of GRIB2 encoding/decoding can be time
  consuming
• NCEP standard, vs WMO grib2 standard
• Document clearly for users

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Managing NAEFS variables - some considerations

• Adding variables to dataset not always easy
• Manage expectations, requirements via a list,
  well documented
• What are short, mid and long term goal for
  variables?
• May take long periods of time to add variables
  that require in house development work to make
  those available
• ?? What if ?? implement new variables same time
  each year?
• Adding variables at set times may make it easier
  to plan for
• Of course can add variables any time if ready,
  otherwise set times
• Each center has variables expert and contact
  person
• CMC Normand Gagnon, NCEP Dick Wobus
• Other centers should ID their variables expert
• See additional info of previous work on next
  slides

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Previous work on variablesNew NAEFS Variables

• Variables in or available to be added to GEFS for
  NAEFS exchange
• GEFS status on Jan. 16, 2008 (D. Wobus)
• CMC status on Mar. 20 2008 (N. Gagnon)

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Proposed NAEFS variables 1 of 4
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Proposed NAEFS variables 2 of 4
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Proposed NAEFS variables 3 of 4
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Proposed NAEFS variables 4 of 4
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Proposition of CMC

• U,V,T,RH at 100 ,50 and 10 hPa i.e. wind,
  temperature, relative humidity
• DPT at 2m i.e. dew-point
• LHTFL, SHTFL (total accumulation) i.e. surface
  latent and sensible heat flux
• DSWRF, DLWRF (total accumulation) i.e. down
  surface short and long wave radiation
• OLR (total accumulation) i.e. outgoing long wave
  radiation
• WEASD, SNOD i.e. snow water equivalent and snow
  depth
• Temperature and soil moisture at level 1 (0-10
  cm)
• BLUEavailable via TIGGE