Transient simulations of the carbon and nitrogen dynamics in northern peatlands: from the Last Glacial Maximum to the 21st century

Spahni, Renato; Joos, Fortunat; Stocker, Benjamin; Steinacher, Marco; Yu, Z. C. (2013). Transient simulations of the carbon and nitrogen dynamics in northern peatlands: from the Last Glacial Maximum to the 21st century. Climate of the past, 9(3), pp. 1287-1308. Copernicus Publications 10.5194/cp-9-1287-2013

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The development of northern high-latitude peatlands played an important role in the carbon (C) balance of the land biosphere since the Last Glacial Maximum (LGM). At present, carbon storage in northern peatlands is substantial and estimated to be 500 ± 100 Pg C (1 Pg C = 1015 g C). Here, we develop and apply a peatland module embedded in a dynamic global vegetation and land surface process model (LPX-Bern 1.0). The peatland module features a dynamic nitrogen cycle, a dynamic C transfer between peatland acrotelm (upper oxic layer) and catotelm (deep anoxic layer), hydrology- and temperature-dependent respiration rates, and peatland specific plant functional types. Nitrogen limitation down-regulates average modern net primary productivity over peatlands by about half. Decadal acrotelm-to-catotelm C fluxes vary between −20 and +50 g C m−2 yr−1 over the Holocene. Key model parameters are calibrated with reconstructed peat accumulation rates from peat-core data. The model reproduces the major features of the peat core data and of the observation-based modern circumpolar soil carbon distribution. Results from a set of simulations for possible evolutions of northern peat development and areal extent show that soil C stocks in modern peatlands increased by 365–550 Pg C since the LGM, of which 175–272 Pg C accumulated between 11 and 5 kyr BP. Furthermore, our simulations suggest a persistent C sequestration rate of 35–50 Pg C per 1000 yr in present-day peatlands under current climate conditions, and that this C sink could either sustain or turn towards a source by 2100 AD depending on climate trajectories as projected for different representative greenhouse gas concentration pathways.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Physics Institute > Climate and Environmental Physics
08 Faculty of Science > Physics Institute

Graduate School:

Graduate School of Climate Sciences

UniBE Contributor:

Spahni, Renato; Joos, Fortunat; Stocker, Benjamin and Steinacher, Marco

Subjects:

500 Science > 530 Physics
500 Science > 550 Earth sciences & geology

ISSN:

1814-9324

Publisher:

Copernicus Publications

Language:

English

Submitter:

Doris Rätz

Date Deposited:

18 Aug 2014 10:02

Last Modified:

26 Jun 2016 01:50

Publisher DOI:

10.5194/cp-9-1287-2013

BORIS DOI:

10.7892/boris.47719

URI:

https://boris.unibe.ch/id/eprint/47719

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