Forestation of boreal peatlands: Impacts of changing albedo and greenhouse gas fluxes on radiative forcing

Annalea Lohila (Corresponding Author), Kari Minkkinen, Jukka Laine, Ilkka Savolainen, Juha-Pekka Tuovinen, Lauri Korhonen, Tuomas Laurila, Hanna Tietäväinen, Ari Laaksonen

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Abstract

We estimated the magnitude of the radiative forcing (RF) due to changes in albedo following the forestation of peatlands, and calculated the net RF by taking into account the changes in both the albedo and the greenhouse gas (GHG) fluxes during one forest rotation. Data on radiation, tree biomass, and soil GHG fluxes were combined with models for canopy cover, tree carbon accumulation, and the RF due to increased atmospheric GHG concentrations for four typical site cases in Finland covering two soil nutrient levels in the south and north of the country. We also studied the observed long‐term surface temperatures to detect any indications of drainage‐induced effects. The magnitude of the albedo‐induced RF was similar to that caused by the carbon sequestration of the growing trees. At three site cases out of four the drainage induced a cooling or negative RF, the tendency for cooling being higher at sites with a higher nutrient level. The differences in albedo‐induced RF mainly arose from the spring season due to (1) the different snow cover duration in the south versus the north, and (2) the different albedos of drained and undrained snow covered peatlands. An increase in the maximum daily temperatures was observed in April in southern Finland, where the most intensive drainage practices have taken place, suggesting that forestry drainage has potentially affected the local climate. Our results show that the decreasing albedo resulting from peatland forestation contributes significantly to the RF, balancing out or even exceeding the cooling effect due to the changing GHG fluxes.
Original languageEnglish
Article number04011
Number of pages15
JournalJournal of Geophysical Research: Biogeosciences
Volume115
Issue number4
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

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radiative forcing
peatland
albedo
greenhouse gas
drainage
cooling
spring (season)
soil gas
atmospheric gas
soil nutrient
snow cover
carbon sequestration
forestry
surface temperature
snow
canopy
nutrient
carbon
biomass
climate

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Lohila, A., Minkkinen, K., Laine, J., Savolainen, I., Tuovinen, J-P., Korhonen, L., ... Laaksonen, A. (2010). Forestation of boreal peatlands: Impacts of changing albedo and greenhouse gas fluxes on radiative forcing. Journal of Geophysical Research: Biogeosciences, 115(4), [04011]. https://doi.org/10.1029/2010JG001327
Lohila, Annalea ; Minkkinen, Kari ; Laine, Jukka ; Savolainen, Ilkka ; Tuovinen, Juha-Pekka ; Korhonen, Lauri ; Laurila, Tuomas ; Tietäväinen, Hanna ; Laaksonen, Ari. / Forestation of boreal peatlands : Impacts of changing albedo and greenhouse gas fluxes on radiative forcing. In: Journal of Geophysical Research: Biogeosciences. 2010 ; Vol. 115, No. 4.
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abstract = "We estimated the magnitude of the radiative forcing (RF) due to changes in albedo following the forestation of peatlands, and calculated the net RF by taking into account the changes in both the albedo and the greenhouse gas (GHG) fluxes during one forest rotation. Data on radiation, tree biomass, and soil GHG fluxes were combined with models for canopy cover, tree carbon accumulation, and the RF due to increased atmospheric GHG concentrations for four typical site cases in Finland covering two soil nutrient levels in the south and north of the country. We also studied the observed long‐term surface temperatures to detect any indications of drainage‐induced effects. The magnitude of the albedo‐induced RF was similar to that caused by the carbon sequestration of the growing trees. At three site cases out of four the drainage induced a cooling or negative RF, the tendency for cooling being higher at sites with a higher nutrient level. The differences in albedo‐induced RF mainly arose from the spring season due to (1) the different snow cover duration in the south versus the north, and (2) the different albedos of drained and undrained snow covered peatlands. An increase in the maximum daily temperatures was observed in April in southern Finland, where the most intensive drainage practices have taken place, suggesting that forestry drainage has potentially affected the local climate. Our results show that the decreasing albedo resulting from peatland forestation contributes significantly to the RF, balancing out or even exceeding the cooling effect due to the changing GHG fluxes.",
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Lohila, A, Minkkinen, K, Laine, J, Savolainen, I, Tuovinen, J-P, Korhonen, L, Laurila, T, Tietäväinen, H & Laaksonen, A 2010, 'Forestation of boreal peatlands: Impacts of changing albedo and greenhouse gas fluxes on radiative forcing', Journal of Geophysical Research: Biogeosciences, vol. 115, no. 4, 04011. https://doi.org/10.1029/2010JG001327

Forestation of boreal peatlands : Impacts of changing albedo and greenhouse gas fluxes on radiative forcing. / Lohila, Annalea (Corresponding Author); Minkkinen, Kari; Laine, Jukka; Savolainen, Ilkka; Tuovinen, Juha-Pekka; Korhonen, Lauri; Laurila, Tuomas; Tietäväinen, Hanna; Laaksonen, Ari.

In: Journal of Geophysical Research: Biogeosciences, Vol. 115, No. 4, 04011, 2010.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Forestation of boreal peatlands

T2 - Impacts of changing albedo and greenhouse gas fluxes on radiative forcing

AU - Lohila, Annalea

AU - Minkkinen, Kari

AU - Laine, Jukka

AU - Savolainen, Ilkka

AU - Tuovinen, Juha-Pekka

AU - Korhonen, Lauri

AU - Laurila, Tuomas

AU - Tietäväinen, Hanna

AU - Laaksonen, Ari

PY - 2010

Y1 - 2010

N2 - We estimated the magnitude of the radiative forcing (RF) due to changes in albedo following the forestation of peatlands, and calculated the net RF by taking into account the changes in both the albedo and the greenhouse gas (GHG) fluxes during one forest rotation. Data on radiation, tree biomass, and soil GHG fluxes were combined with models for canopy cover, tree carbon accumulation, and the RF due to increased atmospheric GHG concentrations for four typical site cases in Finland covering two soil nutrient levels in the south and north of the country. We also studied the observed long‐term surface temperatures to detect any indications of drainage‐induced effects. The magnitude of the albedo‐induced RF was similar to that caused by the carbon sequestration of the growing trees. At three site cases out of four the drainage induced a cooling or negative RF, the tendency for cooling being higher at sites with a higher nutrient level. The differences in albedo‐induced RF mainly arose from the spring season due to (1) the different snow cover duration in the south versus the north, and (2) the different albedos of drained and undrained snow covered peatlands. An increase in the maximum daily temperatures was observed in April in southern Finland, where the most intensive drainage practices have taken place, suggesting that forestry drainage has potentially affected the local climate. Our results show that the decreasing albedo resulting from peatland forestation contributes significantly to the RF, balancing out or even exceeding the cooling effect due to the changing GHG fluxes.

AB - We estimated the magnitude of the radiative forcing (RF) due to changes in albedo following the forestation of peatlands, and calculated the net RF by taking into account the changes in both the albedo and the greenhouse gas (GHG) fluxes during one forest rotation. Data on radiation, tree biomass, and soil GHG fluxes were combined with models for canopy cover, tree carbon accumulation, and the RF due to increased atmospheric GHG concentrations for four typical site cases in Finland covering two soil nutrient levels in the south and north of the country. We also studied the observed long‐term surface temperatures to detect any indications of drainage‐induced effects. The magnitude of the albedo‐induced RF was similar to that caused by the carbon sequestration of the growing trees. At three site cases out of four the drainage induced a cooling or negative RF, the tendency for cooling being higher at sites with a higher nutrient level. The differences in albedo‐induced RF mainly arose from the spring season due to (1) the different snow cover duration in the south versus the north, and (2) the different albedos of drained and undrained snow covered peatlands. An increase in the maximum daily temperatures was observed in April in southern Finland, where the most intensive drainage practices have taken place, suggesting that forestry drainage has potentially affected the local climate. Our results show that the decreasing albedo resulting from peatland forestation contributes significantly to the RF, balancing out or even exceeding the cooling effect due to the changing GHG fluxes.

U2 - 10.1029/2010JG001327

DO - 10.1029/2010JG001327

M3 - Article

VL - 115

JO - Journal of Geophysical Research: Biogeosciences

JF - Journal of Geophysical Research: Biogeosciences

SN - 2169-8953

IS - 4

M1 - 04011

ER -