ec-earth – copenhagen, sep. 7/8, 2011 coupling lpj-guess to ec-earth – progress to date and...
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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. Outline. LPJ-GUESS version 2.1 & Motivation - PowerPoint PPT PresentationTRANSCRIPT
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
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
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
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
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:
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
Low and High Vegetation
Source: IFS Documentation Cy36r1
Prescribed Vegetation Properties
Source: IFS Documentation Cy36r1
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
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
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
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
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
“High Tile” Annual LAI Fields
TropicalVegetation
Tundra
Grasses
No Vegetation
No Vegetation
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
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?)
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
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
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?
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
Thank You!