Reconstructions of past climates from documentary and natural sources in Finland since the 18th century
In this paper both documentary and natural proxy data have been used to improve the accuracy of palaeoclimatic knowledge in Finland since the 18th century. Early meteorological observations from Turku (1748-1800) were analyzed first as a potential source of climate variability. The reliability of th...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/21182 2023-08-20T04:08:44+02:00 Reconstructions of past climates from documentary and natural sources in Finland since the 18th century Holopainen, Jari Venäläinen, Ari University of Helsinki, Faculty of Science, Department of Geology Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, geologian laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, geologiska institutionen 2010-11-25T12:06:15Z application/pdf http://hdl.handle.net/10138/21182 eng eng Helsingin yliopisto University of Helsinki Helsingfors universitet Helsinki: Yliopistopaino, 2006, Publications of the Department of Geology. 1795-3499 URN:ISBN:952-10-2610-3 http://hdl.handle.net/10138/21182 URN:ISBN:952-10-2611-1 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. geologia ja paleontologia Text Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2010 ftunivhelsihelda 2023-07-28T06:10:37Z In this paper both documentary and natural proxy data have been used to improve the accuracy of palaeoclimatic knowledge in Finland since the 18th century. Early meteorological observations from Turku (1748-1800) were analyzed first as a potential source of climate variability. The reliability of the calculated mean temperatures was evaluated by comparing them with those of contemporary temperature records from Stockholm, St. Petersburg and Uppsala. The resulting monthly, seasonal and yearly mean temperatures from 1748 to 1800 were compared with the present day mean values (1961-1990): the comparison suggests that the winters of the period 1749-1800 were 0.8 ºC colder than today, while the summers were 0.4 ºC warmer. Over the same period, springs were 0.9 ºC and autumns 0.1 ºC colder than today. Despite their uncertainties when compared with modern meteorological data, early temperature measurements offer direct and daily information about the weather for all months of the year, in contrast with other proxies. Secondly, early meteorological observations from Tornio (1737-1749) and Ylitornio (1792-1838) were used to study the temporal behaviour of the climate-tree growth relationship during the past three centuries in northern Finland. Analyses showed that the correlations between ring widths and mid-summer (July) temperatures did not vary significantly as a function of time. Early (June) and late summer (August) mean temperatures were secondary to mid-summer temperatures in controlling the radial growth. According the dataset used, there was no clear signature of temporally reduced sensitivity of Scots pine ring widths to mid-summer temperatures over the periods of early and modern meteorological observations. Thirdly, plant phenological data with tree-rings from south-west Finland since 1750 were examined as a palaeoclimate indicator. The information from the fragmentary, partly overlapping, partly nonsystematically biased plant phenological records of 14 different phenomena were combined into one continuous ... Doctoral or Postdoctoral Thesis Northern Finland Ylitornio Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Tornio ENVELOPE(24.147,24.147,65.848,65.848) Ylitornio ENVELOPE(23.677,23.677,66.309,66.309) |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
geologia ja paleontologia |
spellingShingle |
geologia ja paleontologia Holopainen, Jari Reconstructions of past climates from documentary and natural sources in Finland since the 18th century |
topic_facet |
geologia ja paleontologia |
description |
In this paper both documentary and natural proxy data have been used to improve the accuracy of palaeoclimatic knowledge in Finland since the 18th century. Early meteorological observations from Turku (1748-1800) were analyzed first as a potential source of climate variability. The reliability of the calculated mean temperatures was evaluated by comparing them with those of contemporary temperature records from Stockholm, St. Petersburg and Uppsala. The resulting monthly, seasonal and yearly mean temperatures from 1748 to 1800 were compared with the present day mean values (1961-1990): the comparison suggests that the winters of the period 1749-1800 were 0.8 ºC colder than today, while the summers were 0.4 ºC warmer. Over the same period, springs were 0.9 ºC and autumns 0.1 ºC colder than today. Despite their uncertainties when compared with modern meteorological data, early temperature measurements offer direct and daily information about the weather for all months of the year, in contrast with other proxies. Secondly, early meteorological observations from Tornio (1737-1749) and Ylitornio (1792-1838) were used to study the temporal behaviour of the climate-tree growth relationship during the past three centuries in northern Finland. Analyses showed that the correlations between ring widths and mid-summer (July) temperatures did not vary significantly as a function of time. Early (June) and late summer (August) mean temperatures were secondary to mid-summer temperatures in controlling the radial growth. According the dataset used, there was no clear signature of temporally reduced sensitivity of Scots pine ring widths to mid-summer temperatures over the periods of early and modern meteorological observations. Thirdly, plant phenological data with tree-rings from south-west Finland since 1750 were examined as a palaeoclimate indicator. The information from the fragmentary, partly overlapping, partly nonsystematically biased plant phenological records of 14 different phenomena were combined into one continuous ... |
author2 |
Venäläinen, Ari University of Helsinki, Faculty of Science, Department of Geology Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, geologian laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, geologiska institutionen |
format |
Doctoral or Postdoctoral Thesis |
author |
Holopainen, Jari |
author_facet |
Holopainen, Jari |
author_sort |
Holopainen, Jari |
title |
Reconstructions of past climates from documentary and natural sources in Finland since the 18th century |
title_short |
Reconstructions of past climates from documentary and natural sources in Finland since the 18th century |
title_full |
Reconstructions of past climates from documentary and natural sources in Finland since the 18th century |
title_fullStr |
Reconstructions of past climates from documentary and natural sources in Finland since the 18th century |
title_full_unstemmed |
Reconstructions of past climates from documentary and natural sources in Finland since the 18th century |
title_sort |
reconstructions of past climates from documentary and natural sources in finland since the 18th century |
publisher |
Helsingin yliopisto |
publishDate |
2010 |
url |
http://hdl.handle.net/10138/21182 |
long_lat |
ENVELOPE(24.147,24.147,65.848,65.848) ENVELOPE(23.677,23.677,66.309,66.309) |
geographic |
Tornio Ylitornio |
geographic_facet |
Tornio Ylitornio |
genre |
Northern Finland Ylitornio |
genre_facet |
Northern Finland Ylitornio |
op_relation |
Helsinki: Yliopistopaino, 2006, Publications of the Department of Geology. 1795-3499 URN:ISBN:952-10-2610-3 http://hdl.handle.net/10138/21182 URN:ISBN:952-10-2611-1 |
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_ |
1774721179817345024 |