TITLE:
Comparison of Gridded Precipitation Time Series Data in APHRODITE and Asfazari Databases within Iran’s Territory
AUTHORS:
Esmail Nasrabadi, Seyyed Abolfazl Masoodian, Hossein Asakereh
KEYWORDS:
Precipitation Database; Cross-Correlation; Wilcoxon Test; APHRODITE; Asfazari
JOURNAL NAME:
Atmospheric and Climate Sciences,
Vol.3 No.2,
April
30,
2013
ABSTRACT: The V1003R1 version of the monthly, seasonal and annual
precipitation time series of the Middle East APHRODITE database and Asfazari
database within Iranian territory in the time interval 1961 and 2004 were
compared with each other. The monthly, seasonal and annual time series of the
both databases in most cases show a random behavior and the time series follow
a similar pattern with a significant autocorrelation of both databases.
Studying cross-correlation between the time series of the two bases indicate
that the zero lag significance in the monthly, seasonal and annual time series
statistically confirm the coincidence of the peak and fall in the time series
of both bases. Wilcoxon Test with 95% confidence confirms significance of the
mean difference of the two series. However, there is not enough evidence to
confirm the null hypothesis suggesting lack of difference between means of the
two series. The statistical-objective analysis of the two bases’ time series
indicates that although the series follow a similar course, the estimated
precipitation quantity in monthly, seasonal and annual time series of APHRODITE
base, except in several monthly time series and in trivial quantities, has been
less than the estimated precipitation of Asfazari bases, but the amount of the
difference was not constant and did not follow a regular pattern, although this
difference has been narrowed in recent years.