Interactions between land surface, forests and climate : regional modelling studies in the boreal zone
Interactions between the land surface and climate are complex as a range of physical, chemical and biological processes take place. Changes in the land surface or the climate can affect the water, energy and carbon cycles in the Earth system. This thesis discusses a number of critical issues that co...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/166502 2023-08-20T04:06:26+02:00 Interactions between land surface, forests and climate : regional modelling studies in the boreal zone Gao, Yao Burke, Eleanor University of Helsinki, Faculty of Science, Department of Physics, Division of atmospheric sciences Climate Research Unit, Finnish Meteorological Institute Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, fysiikan laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, institutionen för fysik Aalto, Tuula Markkanen, Tiina Laaksonen, Ari 2016-09-06T09:14:00Z application/pdf http://hdl.handle.net/10138/166502 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-951-697-893-5 Helsinki: Erweko Oy, 2016, Finnish Meteorological Institute Contributions No.124. 0782-6117 http://hdl.handle.net/10138/166502 URN:ISBN:978-951-697-894-2 Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. meteorology Text Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2016 ftunivhelsihelda 2023-07-28T06:08:42Z Interactions between the land surface and climate are complex as a range of physical, chemical and biological processes take place. Changes in the land surface or the climate can affect the water, energy and carbon cycles in the Earth system. This thesis discusses a number of critical issues that concern land-atmospheric interactions in the boreal zone, which is characterised by vast areas of peatlands, extensive boreal forests and a long snow cover period. Regional climate modelling and land surface modelling were used as the main tools for this study, in conjunction with observational data for evaluation. First, to better describe the present-day land cover in the regional climate model, we introduced an up-to-date and high-resolution land cover map to replace the inaccurate and outdated default land cover map for Fennoscandia. Second, in order to provide background information for future forest management actions for climate change mitigation, we studied the biogeophysical effects on the regional climate of peatland forestation, which has been the dominant land cover change in Finland over the last century. Moreover, climate variability can influence the land surface. Although drought is uncommon in northern Europe, an extreme drought occurred in the summer of 2006 in Finland, and induced visible drought symptoms in boreal forests. Thus, we assessed a set of drought indicators with drought impact data in boreal forests in Finland to indicate summer drought in boreal forests. Finally, the impacts of summer drought on water use efficiency of boreal Scots pine forests were studied to gain a deeper understanding of carbon and water dynamics in boreal forest ecosystems. In summary, the key findings of this thesis include: 1) the updated land cover map led to a slight decrease in biases of the simulated climate conditions. It is expected that the model performance could be improved by further development in model physics. 2) Peatland forestation in Finland can induce a warming effect in the spring of up to 0.43 K ... Doctoral or Postdoctoral Thesis Fennoscandia Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
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Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
meteorology |
spellingShingle |
meteorology Gao, Yao Interactions between land surface, forests and climate : regional modelling studies in the boreal zone |
topic_facet |
meteorology |
description |
Interactions between the land surface and climate are complex as a range of physical, chemical and biological processes take place. Changes in the land surface or the climate can affect the water, energy and carbon cycles in the Earth system. This thesis discusses a number of critical issues that concern land-atmospheric interactions in the boreal zone, which is characterised by vast areas of peatlands, extensive boreal forests and a long snow cover period. Regional climate modelling and land surface modelling were used as the main tools for this study, in conjunction with observational data for evaluation. First, to better describe the present-day land cover in the regional climate model, we introduced an up-to-date and high-resolution land cover map to replace the inaccurate and outdated default land cover map for Fennoscandia. Second, in order to provide background information for future forest management actions for climate change mitigation, we studied the biogeophysical effects on the regional climate of peatland forestation, which has been the dominant land cover change in Finland over the last century. Moreover, climate variability can influence the land surface. Although drought is uncommon in northern Europe, an extreme drought occurred in the summer of 2006 in Finland, and induced visible drought symptoms in boreal forests. Thus, we assessed a set of drought indicators with drought impact data in boreal forests in Finland to indicate summer drought in boreal forests. Finally, the impacts of summer drought on water use efficiency of boreal Scots pine forests were studied to gain a deeper understanding of carbon and water dynamics in boreal forest ecosystems. In summary, the key findings of this thesis include: 1) the updated land cover map led to a slight decrease in biases of the simulated climate conditions. It is expected that the model performance could be improved by further development in model physics. 2) Peatland forestation in Finland can induce a warming effect in the spring of up to 0.43 K ... |
author2 |
Burke, Eleanor University of Helsinki, Faculty of Science, Department of Physics, Division of atmospheric sciences Climate Research Unit, Finnish Meteorological Institute Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, fysiikan laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, institutionen för fysik Aalto, Tuula Markkanen, Tiina Laaksonen, Ari |
format |
Doctoral or Postdoctoral Thesis |
author |
Gao, Yao |
author_facet |
Gao, Yao |
author_sort |
Gao, Yao |
title |
Interactions between land surface, forests and climate : regional modelling studies in the boreal zone |
title_short |
Interactions between land surface, forests and climate : regional modelling studies in the boreal zone |
title_full |
Interactions between land surface, forests and climate : regional modelling studies in the boreal zone |
title_fullStr |
Interactions between land surface, forests and climate : regional modelling studies in the boreal zone |
title_full_unstemmed |
Interactions between land surface, forests and climate : regional modelling studies in the boreal zone |
title_sort |
interactions between land surface, forests and climate : regional modelling studies in the boreal zone |
publisher |
Helsingin yliopisto |
publishDate |
2016 |
url |
http://hdl.handle.net/10138/166502 |
genre |
Fennoscandia |
genre_facet |
Fennoscandia |
op_relation |
URN:ISBN:978-951-697-893-5 Helsinki: Erweko Oy, 2016, Finnish Meteorological Institute Contributions No.124. 0782-6117 http://hdl.handle.net/10138/166502 URN:ISBN:978-951-697-894-2 |
op_rights |
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. |
_version_ |
1774717482833018880 |