Submitted as: model description paper
19 Sep 2023
Submitted as: model description paper |  | 19 Sep 2023
Status: this preprint is currently under review for the journal GMD.

CLASH – Climate-responsive Land Allocation model with carbon Storage and Harvests

Tommi Ekholm, Nadine-Cyra Freistetter, Aapo Rautiainen, and Laura Thölix

Abstract. The Climate-responsive Land Allocation model with carbon Storage and Harvests (CLASH) is a global land-use model that can be embedded into integrated assessment models (IAMs). It represents vegetation growth, terrestrial carbon stocks, and production from agriculture and forestry for different land-uses in a changing climate; and hence, allows the inclusion of terrestrial carbon stocks, agriculture and forestry in global climate policy analyses. All terrestrial ecosystems and their carbon dynamics are comprehensively described at a coarse resolution. Special emphasis is placed representing the world’s forests. In CLASH, vegetation growth, soil carbon stocks, agricultural yields and natural disturbance frequencies react to changing climatic conditions, emulating the dynamic global vegetation model LPJ-GUESS. Land is divided into ten biomes with six land-use classes (including forests and agricultural classes). Secondary forests are age structured. The timing of forest harvests affects forest carbon stocks; and hence, carbon storage per forest area can be increased through forest management. In addition to secondary forests, CLASH also includes primary ecosystems, cropland, and pastures. The comprehensive inclusion of all land-use classes and their main functions allows representing the global land-use competition. In this article, we present, calibrate, and validate the model, demonstrate its use, and discuss how it can be integrated into IAMs.

Tommi Ekholm et al.

Status: open (until 14 Nov 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Tommi Ekholm et al.

Data sets

LPJ-GUESS model results for parametrizing the CLASH model Thölix, L. and Ekholm, T.

Demonstration of CLASH - Result data and data analysis scripts Freistetter, N.-C., Ekholm, T., Rautiainen, A., and Thölix, L.

Model code and software

CLASH model code, version 2023-07-03 Ekholm, T., Rautiainen, A., and Freistetter, N.

Scripts for CLASH parametrization and for producing the parametrization and validation plots Ekholm, T.

Tommi Ekholm et al.


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Short summary
The CLASH model portrays land allocation between different uses, land carbon stocks, and agricultural and forestry production globally. CLASH can be used to examine the optimal role of land-use in mitigating climate change, providing food and biogenic raw-materials for the economy, and in conserving primary ecosystems. Our demonstration with CLASH confirms that reduction of animal-based food, shifting croplands and storing carbon in forests are effective ways to mitigate climate change.