california_stations

This is a list of weather stations in California that are contained in the
UC IPM database. This can also be generated with
make_california_UCIPM_station_list(), but this takes quite a while. So this
dataset is supposed to be a shortcut to this.

datasets

The phenology of plants (i.e. the timing of their annual life
phases) depends on climatic cues. For temperate trees and many other plants,
spring phases, such as leaf emergence and flowering, have been found to result
from the effects of both cool (chilling) conditions and heat. Fruit tree
scientists (pomologists) have developed some metrics to quantify chilling
and heat (e.g. see Luedeling (2012) <doi:10.1016/j.scienta.2012.07.011>).
'chillR' contains functions for processing temperature records into
chilling (Chilling Hours, Utah Chill Units and Chill Portions) and heat units
(Growing Degree Hours). Regarding chilling metrics, Chill Portions are often
considered the most promising, but they are difficult to calculate. This package
makes it easy. 'chillR' also contains procedures for conducting a PLS analysis
relating phenological dates (e.g. bloom dates) to either mean temperatures or
mean chill and heat accumulation rates, based on long-term weather and phenology
records (Luedeling and Gassner (2012) <doi:10.1016/j.agrformet.2011.10.020>).
As of version 0.65, it also includes functions for generating weather
scenarios with a weather generator, for conducting climate change analyses
for temperature-based climatic metrics and for plotting results from such
analyses. Since version 0.70, 'chillR' contains a function for interpolating
hourly temperature records.

Eike Luedeling

chillR

Statistical Methods for Phenology Analysis in Temperate Fruit
Trees

california_stations function

a data.frame containing stations from the California UC IPM database
(), with the following columns: "Name", "Code", "Interval", "Lat", "Long",
"Elev".<dl class="dl-horizontal">
<dt>list("Name")</dt><dd>mame of the weather station</dd>
<dt>list("Code")</dt><dd>code of the weather station, indicating the name and
the database it comes from</dd> <dt>list("Interval")</dt><dd>period of available
data (as character string)</dd> <dt>list("Lat")</dt><dd>latitude of the station</dd>
<dt>list("Long")</dt><dd>longitude of the station</dd> <dt>list("Elev")</dt><dd>elevation of the station</dd> </dl>

Format

Weather stations in California — california_stations

a data.frame containing stations from the California UC IPM database
(), with the following columns: "Name", "Code", "Interval", "Lat", "Long",
"Elev".<dl class='dl-horizontal'>
<dt>list("Name")</dt><dd>mame of the weather station</dd>
<dt>list("Code")</dt><dd>code of the weather station, indicating the name and
the database it comes from</dd> <dt>list("Interval")</dt><dd>period of available
data (as character string)</dd> <dt>list("Lat")</dt><dd>latitude of the station</dd>
<dt>list("Long")</dt><dd>longitude of the station</dd> <dt>list("Elev")</dt><dd>elevation of the station</dd> </dl>

california_stations: Weather stations in California

Description

Arguments

Format

Examples