Caroline Greiser, Kristoffer Hylander
The dataset contains temperature and relative air humidity measurements from 203 microloggers that were installed near the ground across the central Swedish forest. The loggers recorded forest microclimate every third hour over 15 months.
The microclimate point data were used together with gridded environmental data on landscape physiography and vegetation (e.g. elevation, distance to waterbodies, solar radiation, forest density) to create monthly microclimate maps at 25 m resolution.
Site data with coordinates, forest type, forest density, soil moisture etc., are provided along with the field protocols with information about overgrown or destroyed loggers.
Caroline Greiser, Kristoffer Hylander (2019) Temperature and relative air humidity records from near-ground microclimate loggers in the central Swedish forest 2015–2016. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/greiser-2019-microclimate-1
Greiser, C., Meineri, E., Luoto, M., Ehrlén, J., Hylander, K. (2018). Monthly microclimate models in a managed boreal forest landscape. Agricultural and Forest Meteorology, 250–251, 147-158, https://doi.org/10.1016/j.agrformet.2017.12.252
The dataset includes two csv files, two xlsx files and one readme txt file with more detailed metadata:
Microclimate_loggerdata_all.csv: All logger temperature and humidity measurements including the double measurements on each site from 2 loggers.
Microclimate_loggerdata_minmax.csv: Daily minimum, maximum and mean temperature, minimum and maximum humidity values per site.
Microclimate_field_protocols.xlsx: Fieldwork protocols including comments if a logger was overgrown or damaged and with site data on soil moisture and forest type etc.
Microclimate_response_predictor_values.xlsx: Clean table with all response values (monthly Tmin and Tmax) and predictors (on-site measured and remotely sensed) that were used for the microclimate models.
README.txt: Detailed metadata for each column in each table in the data files.
203 microclimate loggers (iButtons) were installed near-ground across the central Swedish forest in an area of ~16 000 km² (including parts of the counties of Värmland, Örebro, Västmanland and Dalarna). The loggers were placed ca 5 cm above ground in an inverted plastic cup that was taped onto a wooden stick in order to protect them from rain and direct sunlight. Loggers were brought out in May 2015, read out in September 2015, April 2016 and September 2016.
All loggers measured temperature and half of them also air humidity three times a day (ca. at 00:00, 3:00, 6:00, and so on) from June 2015 to August 2016. At some places and during some periods there were two temperature-only loggers in one cup measuring simultaneausly. The temperature measurements of the two loggers in the same pair were sometimes very different (up to several degrees). When extracting daily minimum and maximum temperatures for each site, we picked the less extreme value from the two loggers. For the daily mean temperature we averaged over both loggers.
The high resolution temperature maps derived from these measurements are available as a separate dataset.