The Maproom explores historical daily temperature by calculating simple seasonal statistics.
Many options can be specified to produce yearly time series of a chosen seasonal diagnostic of the daily temperature data. The user can then choose to map the mean, standard deviation or probability of exceeding a chosen threshold, over years; clicking on the map will then produce a local yearly time series of the chosen diagnostic.
Years and Season:
Specify the range of years over which to perform the analysis, and choose the start
and end dates of the season over which the diagnostics are to be performed.
Hot/Cold Day Definition:
This threshold is used to define in Celsius degrees (non inclusive) the temperature
under which a day is considered cold if the minimum temperature is below it; or the
temperature above which a days is considered hot if the maximum temperature is above
it; or the reference temperature for to compute the heating degree days.
Seasonal daily statistics: Choose the seasonal diagnostic quantity (i.e the statistic of the daily data) to
be computed for each season, from the following choices.
Minimum and Maximum Temperature: average minimum or maximum daily temperature over the season.
Heating Degree Days: Heating degree days are summations of negative differences between the mean daily
temperature and user-defined reference base temperature during the season.
Number of Cold and Hot days:
the number of cold or hot days during the season according to the user-defined threshold
and according respectively to the minumim temperature and the maximum temperature.
Yearly seasonal statistics: a choice of yearly statistics over the chosen season of the selected range of years
to produce the map among: the mean, the standard deviation and the probability of
exceeding a user specified threshold.
Spatial Resolution:
The analysis is performed and mapped at each grid point. Additionally it is possible
to average the results of the analysis over the 1˚ grid points falling within administrative
boundaries for the time series graph.
Data: India Meteorological Department (IMD) High Resolution Daily Gridded Temperature Data Set here.
Contact help@iri.columbia.edu with any technical questions or problems with this Map Room.