Simulated changes in vegetation distribution, land carbon storage, and atmospheric CO2 in response to a collapse of the North Atlantic thermohaline circulation
Measurements on air enclosed in glacial ice show that atmospheric CO2 varied by 20 ppmv within several millenia with large iceberg discharges into the North Atlantic (NA) during Heinrich events 4 to 6. The iceberg discharges have been linked to changes in the NA Thermohaline Circulation (THC). Here,...
Main Authors: | , , , |
---|---|
Format: | Conference Object |
Language: | unknown |
Published: |
2005
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/11854/ https://epic.awi.de/id/eprint/11854/1/Khl2005c.pdf https://hdl.handle.net/10013/epic.22298 https://hdl.handle.net/10013/epic.22298.d001 |
id |
ftawi:oai:epic.awi.de:11854 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:11854 2023-09-05T13:20:12+02:00 Simulated changes in vegetation distribution, land carbon storage, and atmospheric CO2 in response to a collapse of the North Atlantic thermohaline circulation Köhler, Peter Joos, F. Gerber, S. Knutti, R. 2005 application/pdf https://epic.awi.de/id/eprint/11854/ https://epic.awi.de/id/eprint/11854/1/Khl2005c.pdf https://hdl.handle.net/10013/epic.22298 https://hdl.handle.net/10013/epic.22298.d001 unknown https://epic.awi.de/id/eprint/11854/1/Khl2005c.pdf https://hdl.handle.net/10013/epic.22298.d001 Köhler, P. orcid:0000-0003-0904-8484 , Joos, F. , Gerber, S. and Knutti, R. (2005) Simulated changes in vegetation distribution, land carbon storage, and atmospheric CO2 in response to a collapse of the North Atlantic thermohaline circulation , Geophysical Research Abstracts, Vol. 7, 02524, 2005. European Geosciences Union, 2nd General Assembly, 24-29 April 2005, Vienna, Austria. . hdl:10013/epic.22298 EPIC3Geophysical Research Abstracts, Vol. 7, 02524, 2005. European Geosciences Union, 2nd General Assembly, 24-29 April 2005, Vienna, Austria. Conference notRev 2005 ftawi 2023-08-22T19:49:36Z Measurements on air enclosed in glacial ice show that atmospheric CO2 varied by 20 ppmv within several millenia with large iceberg discharges into the North Atlantic (NA) during Heinrich events 4 to 6. The iceberg discharges have been linked to changes in the NA Thermohaline Circulation (THC). Here, we analyse how abrupt changes in the NA THC affect the terrestrial carbon cycle by forcing the Lund- Potsdam-Jena Dynamic Global Vegetation Model with climate perturbations from freshwater experiments with the ECBILT-CLIO ocean-atmosphere model. Changes in the marine carbon cycle are not addressed. Modelled NA THC collapsed and recovered after about a millennium in response to prescribed freshwater forcing preturbing glacial background climate. The initial cooling of several Kelvin over Eurasia causes a reduction of extant boreal and temperate forests and a decrease in carbon storage in high northern latitudes, whereas improved growing conditions and slower soil decomposition rates lead to enhanced storage in mid-latitudes. The magnitude and evolution of global terrestrial carbon storage in response to abrupt THC changes depends sensitively on the initial climate conditions which are here varied between preindustrial and glacial background climate. Terrestrial storage varies between 67 and +50 PgC for a range of experiments that start at different times during the last 21,000 years. Simulated peak-to-peak differences in atmospheric CO2 and 13C are between 6 and 18 ppmv and 0.18 and 0.30 o/oo and compatible with the ice core records. Conference Object ice core North Atlantic North atlantic Thermohaline circulation Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Measurements on air enclosed in glacial ice show that atmospheric CO2 varied by 20 ppmv within several millenia with large iceberg discharges into the North Atlantic (NA) during Heinrich events 4 to 6. The iceberg discharges have been linked to changes in the NA Thermohaline Circulation (THC). Here, we analyse how abrupt changes in the NA THC affect the terrestrial carbon cycle by forcing the Lund- Potsdam-Jena Dynamic Global Vegetation Model with climate perturbations from freshwater experiments with the ECBILT-CLIO ocean-atmosphere model. Changes in the marine carbon cycle are not addressed. Modelled NA THC collapsed and recovered after about a millennium in response to prescribed freshwater forcing preturbing glacial background climate. The initial cooling of several Kelvin over Eurasia causes a reduction of extant boreal and temperate forests and a decrease in carbon storage in high northern latitudes, whereas improved growing conditions and slower soil decomposition rates lead to enhanced storage in mid-latitudes. The magnitude and evolution of global terrestrial carbon storage in response to abrupt THC changes depends sensitively on the initial climate conditions which are here varied between preindustrial and glacial background climate. Terrestrial storage varies between 67 and +50 PgC for a range of experiments that start at different times during the last 21,000 years. Simulated peak-to-peak differences in atmospheric CO2 and 13C are between 6 and 18 ppmv and 0.18 and 0.30 o/oo and compatible with the ice core records. |
format |
Conference Object |
author |
Köhler, Peter Joos, F. Gerber, S. Knutti, R. |
spellingShingle |
Köhler, Peter Joos, F. Gerber, S. Knutti, R. Simulated changes in vegetation distribution, land carbon storage, and atmospheric CO2 in response to a collapse of the North Atlantic thermohaline circulation |
author_facet |
Köhler, Peter Joos, F. Gerber, S. Knutti, R. |
author_sort |
Köhler, Peter |
title |
Simulated changes in vegetation distribution, land carbon storage, and atmospheric CO2 in response to a collapse of the North Atlantic thermohaline circulation |
title_short |
Simulated changes in vegetation distribution, land carbon storage, and atmospheric CO2 in response to a collapse of the North Atlantic thermohaline circulation |
title_full |
Simulated changes in vegetation distribution, land carbon storage, and atmospheric CO2 in response to a collapse of the North Atlantic thermohaline circulation |
title_fullStr |
Simulated changes in vegetation distribution, land carbon storage, and atmospheric CO2 in response to a collapse of the North Atlantic thermohaline circulation |
title_full_unstemmed |
Simulated changes in vegetation distribution, land carbon storage, and atmospheric CO2 in response to a collapse of the North Atlantic thermohaline circulation |
title_sort |
simulated changes in vegetation distribution, land carbon storage, and atmospheric co2 in response to a collapse of the north atlantic thermohaline circulation |
publishDate |
2005 |
url |
https://epic.awi.de/id/eprint/11854/ https://epic.awi.de/id/eprint/11854/1/Khl2005c.pdf https://hdl.handle.net/10013/epic.22298 https://hdl.handle.net/10013/epic.22298.d001 |
genre |
ice core North Atlantic North atlantic Thermohaline circulation |
genre_facet |
ice core North Atlantic North atlantic Thermohaline circulation |
op_source |
EPIC3Geophysical Research Abstracts, Vol. 7, 02524, 2005. European Geosciences Union, 2nd General Assembly, 24-29 April 2005, Vienna, Austria. |
op_relation |
https://epic.awi.de/id/eprint/11854/1/Khl2005c.pdf https://hdl.handle.net/10013/epic.22298.d001 Köhler, P. orcid:0000-0003-0904-8484 , Joos, F. , Gerber, S. and Knutti, R. (2005) Simulated changes in vegetation distribution, land carbon storage, and atmospheric CO2 in response to a collapse of the North Atlantic thermohaline circulation , Geophysical Research Abstracts, Vol. 7, 02524, 2005. European Geosciences Union, 2nd General Assembly, 24-29 April 2005, Vienna, Austria. . hdl:10013/epic.22298 |
_version_ |
1776200921490915328 |