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Evaluating nitrogen cycling in terrestrial biosphere models: a disconnect between the carbon and nitrogen cycles

Kou-Giesbrecht, Sian ; Arora, Vivek K.; Seiler, Christian; Arneth, Almut 1; Falk, Stefanie; Jain, Atul K.; Joos, Fortunat; Kennedy, Daniel; Knauer, Jürgen; Sitch, Stephen; O'Sullivan, Michael; Pan, Naiqing; Sun, Qing; Tian, Hanqin; Vuichard, Nicolas; Zaehle, Sönke
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT)

Abstract:

Terrestrial carbon (C) sequestration is limited by nitrogen (N), an empirically established constraint that could intensify under CO$_2$ fertilization and future global change. The terrestrial C sink is estimated to currently sequester approximately a third of annual anthropogenic CO$_2$ emissions based on an ensemble of terrestrial biosphere models, which have been evaluated in their ability to reproduce observations of the C, water, and energy cycles. However, their ability to reproduce observations of N cycling and thus the regulation of terrestrial C sequestration by N have been largely unexplored. Here, we evaluate an ensemble of terrestrial biosphere models with coupled C–N cycling and their performance at simulating N cycling, outlining a framework for evaluating N cycling that can be applied across terrestrial biosphere models. We find that models exhibit significant variability across N pools and fluxes, simulating different magnitudes and trends over the historical period, despite their ability to generally reproduce the historical terrestrial C sink. Furthermore, there are no significant correlations between model performance in simulating N cycling and model performance in simulating C cycling, nor are there significant differences in model performance between models with different representations of fundamental N cycling processes. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000162257
Veröffentlicht am 18.09.2023
Originalveröffentlichung
DOI: 10.5194/esd-14-767-2023
Scopus
Zitationen: 10
Web of Science
Zitationen: 10
Dimensions
Zitationen: 16
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 2190-4979, 2190-4987
KITopen-ID: 1000162257
HGF-Programm 12.11.21 (POF IV, LK 01) Natural ecosystems as sources and sinks of GHGs
Erschienen in Earth System Dynamics
Verlag Copernicus Publications
Band 14
Heft 4
Seiten 767–795
Vorab online veröffentlicht am 14.08.2023
Nachgewiesen in Dimensions
Scopus
Web of Science
Globale Ziele für nachhaltige Entwicklung Ziel 13 – Maßnahmen zum Klimaschutz
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