Boreal and tundra microclimates : New insights from in situ measurements and process-based modelling
In high-latitude regions, climate change is advancing notably faster than the global average and changes in the local environments are already occurring. However, large uncertainties still exist concerning how the climate at fine spatial scales, i.e. the microclimate, responds and feeds back to the...
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2024
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/573618 2024-05-12T08:12:07+00:00 Boreal and tundra microclimates : New insights from in situ measurements and process-based modelling Tyystjärvi, Vilna Macias-Fauria, Marc Aalto, Juha Aalto, Tuula Luoto, Miska Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta Geotieteiden tohtoriohjelma Helsingfors universitet, matematisk-naturvetenskapliga fakulteten Doktorandprogrammet i geovetenskap University of Helsinki, Faculty of Science Doctoral Programme in Geosciences Finnish Meteorological Institute 2024-03-25T14:45:25Z application/pdf http://hdl.handle.net/10138/573618 en eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-951-51-9254-7 Turku: Painosalama, 2024, Department of Geosciences and Geography. A. 1798-7911 URN:ISBN:978-951-51-9255-4 http://hdl.handle.net/10138/573618 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. maantiede Väitöskirja (artikkeli) Doctoral dissertation (article-based) Doktorsavhandling (sammanläggning) Text 1172 Ympäristötiede 1172 Miljövetenskap 1172 Environmental sciences 2024 ftunivhelsihelda 2024-04-17T14:29:09Z In high-latitude regions, climate change is advancing notably faster than the global average and changes in the local environments are already occurring. However, large uncertainties still exist concerning how the climate at fine spatial scales, i.e. the microclimate, responds and feeds back to the large-scale climate, i.e. the macroclimate. Microclimates refer to conditions near or within the land surface, which can deviate considerably from ambient atmospheric conditions due to land surface properties such as vegetation cover and topography. Since microclimates are controlled by local environmental conditions, studying their role in different landscapes is crucial for a better understanding of how microclimates function now and how they might change in the future. Some microclimates may, under certain conditions, change more slowly than macroclimates, which in turn may locally hinder climate change and its environmental impacts. On the other hand, some changes, such as the disappearance of snow cover in northern ecosystems, may drastically alter microclimates and amplify the effects of climate change. In this thesis, I investigate the temporal and spatial variability of microclimates and their environmental drivers in boreal and tundra landscapes, utilising both empirical and process-based approaches. The first chapter focuses on fine-scale soil moisture dynamics in mountain tundra by comparing in situ measurements and simulations of two process-based models. In the second and third chapters, I investigate the magnitude and drivers of microclimate temperatures through an extensive measurement campaign covering seven landscapes in Finland. In the second chapter, the focus is on vertical and spatial variability as well as seasonal differences, while in the third chapter, I study fine-scale variability in seasonal snow cover duration and its impact on near-surface temperatures. Finally, in the fourth chapter, I use process-based modelling to understand the impacts of climate change and forest management practices ... Doctoral or Postdoctoral Thesis Tundra HELDA – University of Helsinki Open Repository |
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HELDA – University of Helsinki Open Repository |
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ftunivhelsihelda |
language |
English |
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maantiede |
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maantiede Tyystjärvi, Vilna Boreal and tundra microclimates : New insights from in situ measurements and process-based modelling |
topic_facet |
maantiede |
description |
In high-latitude regions, climate change is advancing notably faster than the global average and changes in the local environments are already occurring. However, large uncertainties still exist concerning how the climate at fine spatial scales, i.e. the microclimate, responds and feeds back to the large-scale climate, i.e. the macroclimate. Microclimates refer to conditions near or within the land surface, which can deviate considerably from ambient atmospheric conditions due to land surface properties such as vegetation cover and topography. Since microclimates are controlled by local environmental conditions, studying their role in different landscapes is crucial for a better understanding of how microclimates function now and how they might change in the future. Some microclimates may, under certain conditions, change more slowly than macroclimates, which in turn may locally hinder climate change and its environmental impacts. On the other hand, some changes, such as the disappearance of snow cover in northern ecosystems, may drastically alter microclimates and amplify the effects of climate change. In this thesis, I investigate the temporal and spatial variability of microclimates and their environmental drivers in boreal and tundra landscapes, utilising both empirical and process-based approaches. The first chapter focuses on fine-scale soil moisture dynamics in mountain tundra by comparing in situ measurements and simulations of two process-based models. In the second and third chapters, I investigate the magnitude and drivers of microclimate temperatures through an extensive measurement campaign covering seven landscapes in Finland. In the second chapter, the focus is on vertical and spatial variability as well as seasonal differences, while in the third chapter, I study fine-scale variability in seasonal snow cover duration and its impact on near-surface temperatures. Finally, in the fourth chapter, I use process-based modelling to understand the impacts of climate change and forest management practices ... |
author2 |
Macias-Fauria, Marc Aalto, Juha Aalto, Tuula Luoto, Miska Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta Geotieteiden tohtoriohjelma Helsingfors universitet, matematisk-naturvetenskapliga fakulteten Doktorandprogrammet i geovetenskap University of Helsinki, Faculty of Science Doctoral Programme in Geosciences Finnish Meteorological Institute |
format |
Doctoral or Postdoctoral Thesis |
author |
Tyystjärvi, Vilna |
author_facet |
Tyystjärvi, Vilna |
author_sort |
Tyystjärvi, Vilna |
title |
Boreal and tundra microclimates : New insights from in situ measurements and process-based modelling |
title_short |
Boreal and tundra microclimates : New insights from in situ measurements and process-based modelling |
title_full |
Boreal and tundra microclimates : New insights from in situ measurements and process-based modelling |
title_fullStr |
Boreal and tundra microclimates : New insights from in situ measurements and process-based modelling |
title_full_unstemmed |
Boreal and tundra microclimates : New insights from in situ measurements and process-based modelling |
title_sort |
boreal and tundra microclimates : new insights from in situ measurements and process-based modelling |
publisher |
Helsingin yliopisto |
publishDate |
2024 |
url |
http://hdl.handle.net/10138/573618 |
genre |
Tundra |
genre_facet |
Tundra |
op_relation |
URN:ISBN:978-951-51-9254-7 Turku: Painosalama, 2024, Department of Geosciences and Geography. A. 1798-7911 URN:ISBN:978-951-51-9255-4 http://hdl.handle.net/10138/573618 |
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_ |
1798834399063572480 |