¥Anthropogenic influence detected in indices of cold
nights, warm nights, and cold days
Christidis, et al
2005
Alexander, Zhang, et al 2005
DJF Cold
nights
JJA warm
days
Fig.2: Trends (in days per
decade, shown as maps) and globally averaged annual time series anomalies
relative to 1961-1990 mean values (shown as plots) for annual series of
percentile temperature indices for 1951-2003 for (a) cold nights (TN10p),
(b) warm nights (TN90p), Trends were calculated only for the grid boxes
with sufficient data (at least 40 years of data during the period and the
last year of the series is no earlier than 1999). Black lines enclose
regions where trends are significant at the 5% level. The red curves on the
plots are the 21-term binomial fit to the data.
Other indices consistent
– cold days, cold nights, frost days