Commit 0a1c1ff9 authored by Klaus Zimmermann's avatar Klaus Zimmermann
Browse files

Add nzero index (closes #146)

parent a94c7b72
indices:
nzero:
reference: SMHI
period:
allowed:
annual:
monthly:
seasonal:
default: annual
output:
var_name: nzero
standard_name:
long_name: Number of zero-crossing days (days when Tmin < 0 degC < Tmax)
units: days
cell_methods:
- time: sum over days
proposed_cell_methods:
- time: level_crossing within days
- time: sum over days
input:
low_data: tasmin
high_data: tasmax
index_function:
name: count_level_crossings
parameters:
threshold:
kind: quantity
long_name: Threshold value for daily air temperature
standard_name: air_temperature
data: 0.
units: degree_Celsius
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