daylength

Scalar - Calendar day of year from 1 to 366 where the function should cease day length calculations

daystop

Scalar - latitude of the locations, in decimal degrees

The function daylength will calculate the day length for a given for all days of the year up to the user defined day of the year and latitude of the location. Essentially this is the number of hours of daylight for given location for each day. The formula for day length calculation is retained from Ault et al. (2015).

Computes the extended spring indices (SI-x) and false spring
exposure indices (FSEI). The SI-x indices are standard indices used for
analysis in spring phenology studies. In addition, the FSEI is also from
research on the climatology of false springs and adjusted to include an
early and late false spring exposure index. The indices include the
first leaf index, first bloom index, and false spring exposure indices,
along with all calculations for all functions needed to calculate
each index. The main function returns all indices, but each function can
also be run separately.
Allstadt et al. (2015) <doi: 10.1088/1748-9326/10/10/104008>
Ault et al. (2015) <doi: 10.1016/j.cageo.2015.06.015>
Peterson and Abatzoglou (2014) <doi: 10.1002/2014GL059266>
Schwarz et al. (2006) <doi: 10.1111/j.1365-2486.2005.01097.x>
Schwarz et al. (2013) <doi: 10.1002/joc.3625>.

daylength: Daylength Calculator

Description

Usage

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Value

References

Examples