The Community Atmosphere Land Exchange (CABLE) model

1 The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology The Community Atmosphere land Exchange (CABLE) model : results from and new simulations with Rachel Law CABLE coordinator 26th September 2012 The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Acknowledgements land surface modelling team: Ying-Ping Wang, Eva Kowalczyk, Lauren Stevens, Jhan Srbinovsky, Bernard Pak, Tilo Ziehn CABLE committee: Gab Abramowitz, Vanessa Haverd, Eva Kowalczyk, Jhan Srbinovsky CABLE technical support: Jhan Srbinovsky, Kai Lu, Claire Carouge, Mike Rezny ACCESS support: Martin Dix, Hailin Yan CABLE roadmap writing team: Mike Raupach, Gab Abramowitz, Andy Pitman, Vanessa Haverd, Ying-Ping Wang, Albert van Dijk, Luigi Renzullo, Imtiaz Dharssi The CABLE Community .. ~100 people from 33 institutions Australian Climate Change Science Program (ACCSP) The CABLE land surface model The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology CABLE includes Biophysical component o Surface radiation transfer (direct beam/diffuse, visible, NIR and thermal, sunlit/shaded leaves) o Canopy turbulence o Two-leaf canopy o Six soil and three snow layers Biogeochemical component land use and land use change o Patch representation of surface heterogeneity o No vegetation competition and succession Role of land surface models Provide boundary conditions at the land -air interface albedo, surface T, heat and moisture fluxes Partition rainfall into runoff and evaporation River runoff as an input to the oceans Update state variables which affect surface fluxes snow cover, soil moisture, soil T, veg.

2 Cover, Leaf Area Index CABLE components deposition weathering fixation fertilizer leaf wood root metabolic structural CWD microbial slow passive inorganic N labile P sorbed P Strongly sorbed P N loss P loss Occluded P Biophysics (original CABLE) Biogeochemistry (CASA-CNP) CABLE (current) CABLE timeline The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology 1990: First land surface model developed in CSIRO. Single soil type, constant roughness length, no explicit treatment of vegetation. 1994: Added vegetation 1995: Added 6 soil and 3 snow layers, and an empirical stomatal model 1997: Another model of Soil Canopy Atmosphere model (SCAM) developed with an empirical photosynthesis model 1998: Two-leaf canopy model developed 2003: CSIRO Biosphere model (CBM) developed 2006: CBM and SCAM combined to form CABLE version Released, last update in Sep 2008. 2010: CASA-CNP a global biogeochemical model of C, N and P developed Main technical documentation in Kowalczyk et al.

3 , CMAR tech report, 2006; Wang et al., BG, 2010; Wang et al., JGR, 2011. CABLE development since The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology CABLE (single-site & CCAM) UNSW CMAR-Canberra BIOS2, SLI Global offline CAWCR - Bureau of Meteorology land Information System Mk3L ACCESS CCAM TAPM Multi-processor offline Mk3L WRF What about version control? Other university work Multiple vegetation types per grid-cell Code revision: canopy, screen temperature Simpler albedo for 3 hourly radiation Partitioning of runoff and glacier capping Surface energy and water balance CABLE (last released update 09/08) CABLE in CABLE in ACCESS Change number of vegetation types Change number of soil layers Keep parts of MOSES ( sea-ice) Link UM and CABLE variables (pack/unpack) Allow for tiled soil and snow CABLE development UM changes ACCESS land scheme configurations The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology MOSES in CABLE in Canopy formulation one big leaf model canopy placed beside bare ground two leaf model (sunlit and shaded leaves) canopy placed above the ground Grid Tiles 9 surface types (5 vegetated) with 9 tiles used in each grid cell 13 surface types (10 vegetated)

4 With up to 5 tiles used in each grid cell Soil 4 layers, no subsurface tiling 6 layers, subsurface tiling Snow 1 layer 3 layers Kowalczyk et al., The land surface model component of ACCESS: description and impact on the simulated surface climatology, submitted to AMOJ. Note: No carbon output submitted to CMIP5 from either version of ACCESS Vegetation distribution The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology MOSES CABLE Bare ground & permanent ice Lakes & wetland Water % of grid-cell % of grid-cell Vegetation distribution The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology MOSES CABLE Trees Shrubs, grass, crops % of grid-cell % of grid-cell 1850 vs 2005 vegetation distribution The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Crop distribution 1850, used in coupled simulations 2005, used in Atmosphere -only simulation % of grid-cell Seasonal biases (from ERA-Interim)

5 , Atmosphere -only The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Precipitation Screen-level temperature DJF JJA Regions with underestimated precipitation tend to show warm biases Pattern of biases similar across and NH land . warmer than for DJF, cooler than for JJA. mm/day C Surface albedo The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Generally lower albedo in Canopy protrudes through snow layer Leaf optical properties not accounting for low snow-free soil albedo Runoff: northern spring and summer The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Warmer winter/spring temperatures in lead to earlier snow-melt and runoff mm/day Australian precipitation: DJF The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology BoM Obs Atmosphere -only Coupled mm/day Australian screen-level temperature The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology ERA-Interim DJF JJA Atmosphere only cases shown, coupled cases similar C Australian temperature.

6 Diurnal amplitude The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology DJF JJA ERA-Int ERA-Int BoM BoM C Combines offline (global, regional, single-site) and ACCESS versions with common science code Cleaner code including interface to UM Inclusion of biogeochemistry (CASA-CNP) though not fully implemented Hydraulic redistribution (optional, default OFF) Soil water flux correction for energy balance Version control in Subversion repository hosted at NCI Trac page to facilitate Community code development Release date: September 26, 2012 Soon! The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology CABLE (single-site & CCAM) UNSW CMAR-Canberra BIOS2, SLI Global offline CAWCR - Bureau of Meteorology land Information System Mk3L ACCESS CCAM TAPM Multi-processor offline Mk3L WRF Other university work CABLE trac page The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology benchmarking The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Offline benchmarks: single-sites , workspace The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Offline benchmarks.

7 Global 1986-1995, at 1 x 1 resolution with GSWP2 meteorological forcing The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Latent heat Gross Primary Productivity ACCESS benchmark, Atmosphere -only, 20 years Seasonal screen level temperature bias Dec/Jan/Feb Jun/Jul/Aug revised optical properties revised optical properties June-August surface albedo Thank you The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Rachel Law CABLE coordinator Phone: 03 9239 4427 Email: CABLE trac page: CABLE email list: Thank you CABLE workshop, Oct 25 2012, UNSW