History

Background

In autumn 1998 professor Sakari Tuhkanen and Jukka Käyhkö of the Department of Geography of Turku University initiated the Urban Climate Research Project. Its first aim was to build up a dataset that allows research after the spatial and temporal variability of temperatures in and around the city of Turku. Furthermore, the project should provide opportunities for education in e.g. urban climatology and data processing/analyses techniques. In order to reach this aim, plans were made to establish a network of temperature loggers and weather stations, which collect continuous data for at least several decades.
The early history of the project is fully described in the project’s baseline document that can be found as an attachment at the bottom of this page.
 

Planning of a project

Due to the highly variable topography and strong influence of the sea, the Turku (60º27’N, 22º16’E) area is a demanding and interesting environment to study local and regional climate. In order to cover all the important environmental features, up to 60 temperature loggers were planned in and around the city. At the time the project was launched, no other projects of its kind were known that had a similar dense measuring network. This makes the TURCLIM project quite unique.
 
Table 1. Basic information about research area.
Temp. year 4,8 ºC
Temp. Feb -6,8  ºC
Temp. Jul 16,5  ºC
Inhabitants 175 000
Area 306,4 km²
 
Several different factors were taken into account when planning the temperature logger network. The goal was to build a representative, but also save and durable network. In order to accomplish that, loggers had to be properly distributed over the research area and placed on open fields with a horizontal grass surface, undisturbed by any shadowing objects. In order to prevent sabotage, loggers were supposed to be put to a height of 3 meters instead of the standard 2 meters. In case a location of interest (normally defined from maps) would after all not meet these criteria, the idea was to look for the best possible compromise between optimum and possibilities in the nearby surrounding.
In order to obtain more detailed climatological data, four more advanced weather stations were planned to be installed. The installation of the weather stations was planned such that the temperature probe would be situated at a height of three meters above ground level.
 

Important phases of the Urban Research Project so far

  • 1998. Initiation of the project.
  • 1999-2000. Planning. General planning of the observation network, purchasing of the equipment and their testing.
  • 2001-2002. Inauguration of the observational period.  Distribution of the temperature loggers across Turku and installation of two weather stations. Data collection and development of data storage methods. Also addition of missing temperature loggers. Testing and improvement of functioning of the weather stations.
  • 2003. Baseline documentation. Compilation of all relevant information of the project in form of a Baseline Document and creation of the TURCLIM project website
  • 2004. System development. Design and development of the new TURCLIM database system to accommodate further needs for data storage and retrieval. Co-operation with Turku environmental office started.
  • 2005. System implementation. Implementation of the revised TURCLIM information system (database, server applications, user applications, web map).
  • 2006-2008. Maintenance of the system.
  • 2009. Purhcase of 90 new temperature and relative humidity data loggers (type HOBO U23 Pro V2) and radiation shields. Calibration of the new loggers in three temperature regimes. Planning of the replacement of the old temperature loggers installed in 2001.
  • 2010. Installation of the new temperature loggers (in April-May). The current observation network will be simultaneously complemented with 10-15 new measurement points.
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