LPJ-GUESS version 4.0

LPJ-GUESS version 4.0

Michael Mischurow12th November 2015, Båstad

Version 3.0 (June 2014)

● Nitrogen cycle was added● BVOC emissions: isoprene and monoterpene fluxes● Diurnal mode: for some of the canopy exchange processes● The new Gridcell class corresponds to a geographic location

– May contain one or several stands. Different stands are typically used to simulate different landcover types

Technical changes● Support climate forcing data in CF-conformant NetCDF file format● Instruction files can import other instruction files● Functionality for saving the model's current state to file and

restarting● Code documentation can now be generated with Doxygen● Improved benchmarks system with HTML reports

Version 4.0● Landcover change

● Crop phenology

– C-only crops (following Bondeau et al. 2007)

– C-N crops

● Management

– Sowing and harvest dates

– Amounts of N fertilisers applied

Land cover change

Lindeskog et al. (2013)

time

frac

tion

● Sub-grid behaviour changes in landcover fractions is an ill-defined problem

● Requires assumption or additional data

● Preserving history in the system

Crop phenology

Lindeskog et al. (2013) and Olin et al. (2015a)

● Separate C-only and C-N crops– C crops follow Boundeau et

al. 2007

● Daily C-assimilates allocation for both

● Optimal development curve

● N application at growth-sensitive time

Management practices

● Sowing and harvest dates

● N fertilisation● Cover crops● Tillage● Irrigation

Olin et al. (2015b)

Total Cropland

Traditional 55 44

Cover crops 24 12

Moderate tillage 54 42

No tillage 53 41

Manure 54 42

Leaving residues 66 54

PNV 18

N leaching, Tg N y-1

Overview● Land cover change history preserved in the soil● Ensuring mass balance on transition● Flexible crop phenology with daily C allocation● A number of management practices● Soil texture follows soil hydrological properties● Reduced C:N plasticity of roots and sapwood● CRU-NCEP (1901-2013) new default met. forcing● Minor bugfixes

Next versions● N transformation

– Gaseous losses by species, based on Xu Ri et al. 2008 approach

● Process-based fire module

– BLAZE model will be default module, though Glob-FIRM will remain an option

● Ozone damage

● Peat land / wetland hydrology

● Data assimilation

● Validation against observed data

Further information

http://web.nateko.lu.se/lpj-guess/

Programming and general question Johan Nord

Wetlands, permafrost, methane, Arctic PFTs Paul Miller

Crops, managed forests, land use Mats Lindeskog

Nitrogen cycle David Wårlind

Plant BVOC emissions Guy Schurgers

Wind and insect disturbance Fredrik Lagergren

Wildfire disturbance and emissions Wolfgang Knorr

European tree species and large grazers Thomas Hickler

RCA-GUESS (regional ESM) Ben Smith

EC-EARTH (global ESM) Paul Miller