EC-Earth – Copenhagen, Sep. 7/8, 2011 Coupling LPJ-GUESS to EC-Earth – Progress to Date and...
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Transcript of EC-Earth – Copenhagen, Sep. 7/8, 2011 Coupling LPJ-GUESS to EC-Earth – Progress to Date and...
![Page 1: EC-Earth – Copenhagen, Sep. 7/8, 2011 Coupling LPJ-GUESS to EC-Earth – Progress to Date and Plans Lund University - Paul Miller, Guy Schurgers, Ben Smith,](https://reader036.fdocuments.net/reader036/viewer/2022081603/5697bf9f1a28abf838c94fbf/html5/thumbnails/1.jpg)
EC-Earth – Copenhagen, Sep. 7/8, 2011
Coupling LPJ-GUESS to EC-Earth – Progress to Date and Plans
Lund University - Paul Miller, Guy Schurgers, Ben Smith, Almut Arneth
KNMI – Philippe Le Sager, Martina Weiss, Bart van den Hurk
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Outline
• LPJ-GUESS version 2.1 & Motivation• EC-Earth / LPJ-GUESS Coupling – Progress to date• Plans – near term• Plans – long term
Goal: quantification and greater understanding of the feedbacks (biogeophysical and biogeochemical) between vegetation and climate at various temporal and spatial scales
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Average individual for plant functional typeor species cohort in patch
Modelled area (stand)10 ha - 2500 km2
replicate patches in variousstages of development
Patch0.1 ha
tree grass
crown area
height
fine roots
leaves
LAI
sapwood
heartwood
0-50 cm50-100 cm
leaves / LAI
fineroots
stemdiameter
crown area
height
fine roots
leaves
LAI
sapwood
heartwood
sapwood
heartwood
0-50 cm50-100 cm
leaves / LAI
fineroots
stemdiameter
LPJ-GUESS ’cohort mode’ resolves plant individuals,canopy vertical structure and patch-scale heterogeneity*
*Smith et al. 2001 Global Ecology and Biogeography 10: 621
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Dominant Global Vegetation in LPJ-GUESS v2.1
Picea
Pinus
Larch
TeBS
Birch
TeBE
TrBE
TrIBE
TrBR
C3GC4G
No Veg
Benchmarking datasets for carbon pools & fluxes, water fluxes, vegetation
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RCA-GUESS can be used to identify hotspots of biophysical vegetation -feedbacks – significant locally and seasonally
Hydrological cycle feedbacks in southern and central Europe (summer) - underlying vegetation response
Change in JJA mean annual open land LAI SCN - CTL
negative T
feedback
CO2 fertilization
LAI increase E increase Central Europe:
positive T
feedback
warming/drying
LAI decrease E decrease
Southern Europe:
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H-TESSEL Has Vegetation as a Fixed Input Field
• Each grid cell has two vegetation types, one high and one low, with specified cover fractions
• Based on GLCC data & BATS classification (1km)
• 1km raw data is aggregated for various IFS resolutions
Source: IFS Documentation Cy36r1
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Low and High Vegetation
Source: IFS Documentation Cy36r1
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Prescribed Vegetation Properties
Source: IFS Documentation Cy36r1
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Replacing H-TESSEL’s Prescribed Vegetation with LPJ-GUESS Output
Source: IFS Documentation Cy36r1
No_veg
C3 GRASS
BNS
BNE
IBS
BINE
TeBS
TeBE
C4 GRASS
} TROPICAL TREES
LPJ-GUESS v2.1 – PFT with Maximum LAI
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Offline/coupled set-up
LPJ-GUESS v2.1
CMIP5/RCPs
6h F
orci
ng
1 Jan 1850 - Restart
LPJ-GUESS v2.1
EC-Earth (IFS/H-TESSEL)V2.3
OASIS
EC-Earth PreIndustrial (v2.2)
(1800-49)
In Future: Canopy Height,Albedo, Water Uptake
LPJ-GUESS DUMMY
Daily LAI high/low veg LAI
For testing...
Compare with default EC-Earth
fields
offline
OASIS
Land use
coupled
Soil waterSoil temp.
Precip.2m TempSW rad.
Snow
Guy Schurgers
& Uwe Fladrich
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First Offline, (v2.2) PreIndustrial Runs
• Use 1840-49 monthly averages of Tair, Tsoil, SW radiation, soil water OR precipitation
• Uses same T159 resolution as IFS
• Uses soil properties as decribed in Balsamo et al. (2009)
• Starts from bare ground and runs for 400 years, for all 9072 land points
• ”Low” LAI: No tree PFTs in simulation
• ”High” LAI: All PFTs can establish
• ”Savestate” on Dec 31, 1849 still being implemented
Spinup Natural Vegetation at (45.4 N, 2.5 E)HTESSEL: Interrupted Forest
TEMPERATE/EUROPE
0
0.5
1
1.5
2
2.5
3
3.5
4
1 26
51
76
101
126
151
176
201
226
251
276
301
326
351
376
401
426
451
476
SPINUP YEAR
LA
I
Picea
Pine
TeBS
Birch
C3G
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecMONTH
LA
I
HIGH
LOW
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Tropical and Boreal/Tundra ”High” Tile Vegetation
Natural Vegetation at (65.61 N, 50.4 E)HTESSEL: Evergreen Needleaved Trees
Natural Vegetation at (-5 N, 58.5 W)HTESSEL: Interrupted Forest
TROPICAL SITE
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
1
25 49 73 97
121
145
169
193
217
241
265
289
313
337
361
385
409
433
457
481
SPINUP YEAR
LAI
TrBE
TrIBE
TrBR
C3G
C4G
TUNDRA
0
0.5
1
1.5
2
2.5
3
3.5
1 23 45 67 89 111
133
155
177
199
221
243
265
287
309
331
353
375
397
419
441
463
485
SPINUP YEARLA
I
Picea
Pinus
Birch
C3G
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Dominant Vegetation types (“High” Tiles)
• Dominant vegetation from first offline spinup run uses “old” preindustrial spinup data (v2.2) • Dominant vegetation types reasonable nonetheless
TropicalPFTs
TemperatePFTs
Boreal/TundraPFTs
Grasses
No Vegetation
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“High Tile” Annual LAI Fields
TropicalVegetation
Tundra
Grasses
No Vegetation
No Vegetation
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Carbon Cycle Benchmarks
Discrepancy due to, e.g.• LPJ-GUESS spinup too short• Lower pCO2 in 1849• Biases in ECE output• T159 areas used to uspcale???
Variable CRU forced,
1961-90
EC-Earth, Preindustrial,
1940-49
NPP
(GtC/yr)
58 40
Vegetation Carbon (GtC)
802 569
Soil Carbon (GtC) 1331 876
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IFS LPJ-GUESS onlinecoupling
• Status = Coupled !!– LPJ-GUESS uses 15 fields from IFS– Global fields, 6h coupling, T159– IFS receives but does not use LAIs– Successful 3 year testrun with EC-Earth v2.3– LPJ-GUESS starts from bare ground
• Before distribution– realistic & automatic restart (IFS/NEMO/LPJ-GUESS)– LPJ-GUESS restart files (generated with most recent Preindustrial
control run) – no longer bare ground – Thorough testing– practical & unflawed coupling frequency (IFS-NEMO-LPJ-GUESS
(TM5?)
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EC-Earth & LPJ-GUESS – Next Steps
• Produce LPJ-GUESS restart for 01-Jan-1850• .... And continue the technical testing on
ECMWF supercomputers• Use LPJ-GUESS LAI fields in EC-Earth
sensitivity tests • Compare runs with ECE soil water and LPJ-
GUESS soil water• Add some new shrub PFTs (eg for Australia)• GOAL: first coupled run by end of 2011
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EC-Earth & LPJ-GUESSSome Planned Experiments
• ECE v CRU offline, 1901-2005 – determination of biases
• Assess sensitivity of EC-Earth to LAI fields from LPJ-GUESS
• Beyond LAI: sensitivity to new fields, e.g. albedo, canopy height/z0, water uptake etc.
• Pinatubo experiment – are climate and vegetation anomalies amplified or damped in coupled experiments?
• Spring and summer droughts
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EC-Earth (IFS/H-TESSEL/PISCUS)
Studying Feedbacks with LPJ-GUESS & EC-Earth (v2.x)
LPJ-GUESS Version X + OASIS Interface v2.0
CMIP5/RCPs/Land Use etc.
OASIS
F90
6h Forcing(17 Fields)
LAI high/low
1 Jan 1850 - Restart
LPJ-GUESS
OASIS
EC-Earth PreIndustrial Output, 1800-49
CH4, CO2, BVOC, NOx
TM5
N dep, Ozone
v2.x/v3?
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Current LPJ-GUESS Development Activity
• Coupled Nitrogen-Carbon dynamics • Tropical wetlands• BVOC parameterisation for global PFTs• Land use & agriculture (based on LPJ-mL)• Ozone effects on plants• Global SPITFIRE model parameterisation• Forest management module• Migration module• Reduced timestep (diurnal cycle) • The Gridcell class• Generic OASIS interface
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Thank You!