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Acta Geographica Sinica >

2012 , Vol. 67 >Issue 3: 301 - 311

DOI: https://doi.org/10.11821/xb201203002

Development of Homogenized Monthly Precipitation Dataset in China during 1900-2009

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  • 1. National Meteorological Information Center, Beijing 100081, China;
    2. Hunan Provincial Climate Center, Changsha 410125, China

Received date: 2011-08-19

  Revised date: 2012-11-14

  Online published: 2012-03-20

Supported by

National Basic Research Program of China (973 Program), No.2010CB951600; National Technology R&D Program, No.2007BAC29B01-01; Special Fund of China Meteorological Administration

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Abstract

Based on the collection and processing of the China's national-wide monthly station observational precipitation data during 1900-2009, the data series for each station has been tested for their homogeneity with Standard Normalized Homogeneity Test (SNHT) method and the inhomogeneous part of the series are adjusted. Then the 1971-2000 climatology normals and precipitation anomalies during 1900-2009 have been transformed into the grid boxes at resolutions of 5白5? and 2白2?, respectively, and two gridded form datasets are constructed by combining the normals and anomalies. After that, the missing values for the 5白5? grid dataset are interpolated by Empirical Orthogonal Function (EOF) techniques. With the datasets at different resolutions, the precipitation change series during 1900-2009 over Chinese Mainland were built, and the annual and seasonal precipitation changing trends for recent 110 years were analyzed. The result indicated that the annual precipitation showed a slightly dryer trend during the 110 years, but with no statistical confidence. To be pointed out, the interpolation of the missing values makes the precipitation amounts in the early 1900s decrease, so the trend for the 110 years increased.

Key words： precipitation; dataset; homogeneity; interpolation

Cite this article

LI Qingxiang, PENG Jiadong, SHEN Yan . Development of Homogenized Monthly Precipitation Dataset in China during 1900-2009[J]. Acta Geographica Sinica, 2012 , 67(3) : 301 -311 . DOI: 10.11821/xb201203002

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