First IPILPS Workshop: Closure

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First IPILPS WorkshopClosure Thanks

• Ann Henderson-Sellers and the IPILPS Team

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IPILPS - Why Are We All Here?

• Fluxes reservoirs of isotopes H218O HD16O
  have utility in surface energy water budgets
• Stable isotopic interpretation of basin water
  budgets adds information on gross water fluxes
• The promise for isotopic finger-printing of
  near-surface water cycle has real breakthru
  potential
• Goals this week
• Demonstrate that our ILSSs generate plausible
  simulations and/or improve them
• Journal papers
• Global Planetary Change
• Better links ?

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Workshop Goal 1 Plausibility
To demonstrate that Isotopically-enabled Land
Surface Schemes (ILSSs) generate plausible
simulations at the diurnal scale of the exchanges
of Stable Water Isotopes (SWIs) at the soil,
plant, air interfaces or to identify their
shortcomings and propose ways of improving the
simulations.

• Plausibility
• are simulations good enough
• can we define plausibility?
• gross fluxes first
• e.g.PILPS plots

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ILSSs Evaluation Procedures

• How to evaluate current and future ILSS
  simulations provide useful feedback
• Check the gross water and energy FIRST
• Need conservation, equilibration and
  plausibility
• Diurnal shapes should look right
• Ranges of each models simulation reasonable
• Some metrics need to be met adequately
• Bungy chords not too stretched
• dD v d18O plots should look right
• polar diagrams in correct sectors
• polar plots from a known base
• polar plots with radius r angle

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ILSSs Evaluation Methods Metrics

• What can we assert SWIs ought to be like?

PR-C lt0.1
TR-S lt10
RS-S ???
CE-C lt20
TR-P lt10
PR-RS lt10
SE-S lt20
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Plausible budget seasonal variability
Tumbarumba
Tumbarumba
d18O in water flux ()
Water Flux (mm/year)
Manaus
Manaus
d18O in water flux ()
Water Flux (mm/year)
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ILSSs Evaluation Methods Values

• Check Conservation Equilibration Plausibility

ENERGY GROSS H2O Stable Isotopes
Conservation lt 0.1 Wm-2 lt0.1 mmd-1 lt0.1SMOW
Equilibration lt 0.1 Wm-2 lt0.1 mmd-1 lt0.1SMOW
Plausibility Seasonal lt 1 Wm-2 lt1 mmd-1 lt1SMOW
Plausibility 3-hour avs lt 10 Wm-2 lt10 mm lt10SMOW
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Workshop Goal 2 Improving ILSSs
To demonstrate that Isotopically-enabled Land
Surface Schemes (ILSSs) generate plausible
simulations at the diurnal scale of the exchanges
of Stable Water Isotopes (SWIs) at the soil,
plant, air interfaces or to identify their
shortcomings and propose ways of improving the
simulations.

• Specific Foci
• are simulation diffs due to (i) sensitivity to
  forcing (ii) parameterisation differences (iii)
  both?
• is Craig Gordon adequate? ( if not what is
  required?)
• on diurnal scales how large are SWI differences
  what observations could illuminate adequacy?

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Diurnal Isotopic Flux Simulations
dD moisture fluxes transpiration other evap
(A-D)

• Other evaporation differs very much
• B doesnt seem to do transpiration
• D has single value
• Transpiration range similar for C A
• But C shows much more depletion in middle of the
  day
• This is winter (Tumbarumba)
• Jan is summer

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Workshop Goal 3 Good Observations

• are simulation diffs due to (i) sensitivity to
  forcing (ii) parameterisation differences
  and/or (iii) both?
• is Craig Gordon adequate? ( if not what
  is?)
• on diurnal scales how large are SWI differences
  what observations could illuminate adequacy?

• This plot suggests parameterisation diffs here
• Might suggest CG not adequate
• Obs here need to be lt30 - 40 (dD transpn)

Lets measure what we CAN measure well, well
dD flux
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Workshop Output Special Issue GP

• Papers due with Kendal by 31 May

Henderson-Sellers Overview of IPILPS Phase 1
Gat Airey SWIS at the Soil, Plant Atmosphere Interface
Gat Scaling issues for SWIs
Gibson Basins SWIs
Fischer Sturm REMOiso Forcing for IPILPS
Fischer et al IPILPS Phase 1 First results
Twining MIBA at Tumbarumba
Sturm SWIs at Heidelburg
Griffith FTIR for SWI observations for IPILPS
Yoshimura MATSIROiso in IPILPS
Fischer ICHASM in IPILPS
Schmidt Aleinov GISSEiso in IPILPS
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Future Sensitivity Experiments Soon

• PLAN
• Use current IPILPS forcings and locations
• Quick add on for ILSSs that pass gross and
  isotope plausibility tests
• FORCING
• Precipitation isotopes
• Fixed
• Step-function
• Vapour isotopes
• Fixed (needs to be linked to precip.)
• MODEL PARAMETERS
• Water reservoir capacities
• HOW-TO
• ICHASM a test case maybe MATSIROiso

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Isotopes in LSSs are very young

• But clearly worth nurturing

• Named Sam by his parents who havent yet told him
  this stands for
• Soil Atmosphere Model

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Great Group many thanks ?
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