Next-Generation Ecosystem Experiments (NGEE Arctic): Connections to CLM Land Model Working Group Meeting, Boulder, CO 20 February 2013 NGEE-Arctic Modeling Team: (alphabetical) Gautam Bisht 2 , Bob Bolton 3 , Marcia Branstetter 1 , Dipankar Dwivedi 2 , Eugenie Euskirchen 3 , Chandana Gangodagamage 4 , Santonu Goswami 1 , Glenn Hammond 5 , Dan Hayes 1 , Larry Hinzman 3 , Forrest Hoffman 1 , Eunmo Koo 4 , Charlie Koven 2 , Jitu Kumar 1 , Anna Liljedahl 3 , Dave McGuire 3 , Richard Mills 1 , Scott Painter 4 , Bill Riley 2 , Linn Rodman 4 , Joel Rowland 4 , Guoping Tang 1 , Jinyun Tang 2 , Peter Thornton 1 , Bryan Travis 4 , Haruko Wainwright 2 , Cathy Wilson 4 , Stan Wullschleger 1 , Chonggang Xu 4 , Xiaofeng Xu 1 , Fengming Yuan 1 Affiliations: 1 ORNL, 2 LBNL, 3 UAF, 4 LANL, 5 PNNL
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Next-Generation Ecosystem Experiments (NGEE Arctic): Connections to CLM
Land Model Working Group Meeting, Boulder, CO 20 February 2013
Eugenie Euskirchen3, Chandana Gangodagamage4, Santonu Goswami1, Glenn Hammond5, Dan Hayes1, Larry Hinzman3, Forrest
Hoffman1, Eunmo Koo4, Charlie Koven2, Jitu Kumar1, Anna Liljedahl3, Dave McGuire3, Richard Mills1, Scott Painter4, Bill Riley2, Linn Rodman4, Joel Rowland4, Guoping Tang1, Jinyun Tang2, Peter
Polygonal tundra on permafrost, near Barrow, Alaska
Current scaling approach for land component of climate prediction model (e.g. CLM4)
lake
Arctic grass
Arctic shrub
bare ground
lake soil column
grass shrub
10-100 km
= +
Best ESMs currently use quasi one dimensional approach, with assumption of linear scaling
A nested scaling framework based on hydrology/geomorphology
Climate-scale questions:
• What is the fraction of inundated area? and does it have a predictable relationship to carbon content, vegetation community?
• Are active layer thickness and vegetation growth correlated?
• What are the primary controls on vegetation growth and NEE? and on CO2 vs. CH4 fluxes?
Fine-scale freeze-thaw with PFLOTRAN
Jitu Kumar, ORNL
Overland Flow with Amanzi-ATS
Scott Painter: LANL
Geomorphic units based approach for intermediate scale model mesh
Jitendra Kumar, ORNL
Delineation of watersheds and streams at CLM climate grid-cell scale using 0.5m resolution LIDAR DEM
Jitendra Kumar, ORNL
~2km
Land model scaling framework: subgrid hierarchy
Gridcells:
Landunits:
Soil Columns:
Plant Functional Types:
This is the level at which land surface states and fluxes, such as albedo and net carbon exchange, are coupled to the atmosphere.
Geomorphologically distinct sub-regions of a gridcell (using drainage basin delineation)
Hydrologically distinct sub-regions of a landunit (components of polygons)
Phytologically distinct occupants of a soil column (forb, grass, shrub)
CLM PFLOTRAN
Prototype model integration
BGC
Surface flux
Subsurface
BGC
Surface flux
Subsurface
CLM Surface flux
PFLOTRAN
Subsurface
CLM-BGC
This diagram illustrates how the interoperability of CLM and PFLOTRAN is being addressed. The Amanzi group is tasked with assessing a similar interoperability approach with CLM.
Summary: CLM’s BGC algorithms are being implemented in PFLOTRAN’s BGC infrastructure. CLM’s subsurface routines are being replaced by PFLOTRAN, and CLM’s surface flux algorithms and implementation are being retained. Current prototype interface between CLM and PFLOTRAN is being refined
Most plant physiological parameters, except for ‘flnr’ and ‘fcur’, are derived from flowing publications: Chapin et al. 1980; 1986; 1988; 1996; Chapin and Shaver 1988; Hobbie, 1996.
Vcmax with New PFTs at Barrow
Vcmax parameterized via ‘flnr’
Carex a
quatilis
Eriopho
rum an
gustifo
lia
Duponti
a fish
eri
Petasite
s frig
idus
Salix p
ulchra
Vaccin
ium vi
tis-id
aea
CLM
CLM-CN
Bethy
Hybrid
v c,m
ax25
(µm
ol m
-2 s
-1)
0
25
50
75
100
125
150
(Alistair Rogers et al. 2013) (Moss: Williams and Flanagan, 1998. PCE 21: 555-564; Lichen: Nash et al. 1983. Oecologia 58: 52-56)