Returns an example dataset of vapour pressure deficit (\(VPD\)) monitoring from 2012-2015 at 1300 m a.s.l. in the Swiss Alps (Loetschental, Switzerland; Peters et al. 2019). Sensors were installed at the site on a central tower (~2.5 m above the ground) within the canopy to measure air temperature and relative humidity (Onset, USA, U23-002Pro) with a 15‐min resolution. Vpd (\(kPa\) was calculated from the air temperature and relative humidity measurements according to WMO (2008).
vpdProvides an is.trex-compliant object with 135840 rows and 1 column.
Date of the measurements in solar time (“yyyy-mm-dd”) (character)
kPa values obtained from the site-specific monitoring (numeric)
Peters RL, Speich M, Pappas C, Kahmen A, von Arx G, Graf Pannatier E, Steppe K, Treydte K, Stritih A, Fonti P. 2018. Contrasting stomatal sensitivity to temperature and soil drought in mature alpine conifers. Plant, Cell & Environment 42:1674-1689 doi:10.1111/pce.13500
WMO. 2008.Guide to meteorological instruments and methods of observation, appendix 4B, WMO‐No. 8 (CIMO Guide). Geneva, Switzerland: World Meteorological Organization.