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).

vpd

Format

Provides an is.trex-compliant object with 135840 rows and 1 column.

index

Date of the measurements in solar time (“yyyy-mm-dd”) (character)

value

kPa values obtained from the site-specific monitoring (numeric)

References

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.