| Errors and Correction of Precipitation Measurements in China |
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| 作者姓名： | 任芝花 黎明琴 |
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| 作者单位： | [1]National Meteorological Information Center, China Meteorological Administration, Beijing 100081 [2]Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081 |
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| 基金项目： | This work was supported by the China Meteorological Administration (sponsored program: 98-2W-2/2013). |
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| 摘 要： | In order to discover the range of various errors in Chinese precipitation measurements and seek a correction method, 30 precipitation evaluation stations were set up countrywide before 1993. All the stations are reference stations in China. To seek a correction method for wind-induced error, a precipitation correction instrument called the ＂horizontal precipitation gauge＂ was devised beforehand. Field intercomparison observations regarding 29,000 precipitation events have been conducted using one pit gauge, two elevated operational gauges and one horizontal gauge at the above 30 stations. The range of precipitation measurement errors in China is obtained by analysis of intercomparison measurement results. The distribution of random errors and systematic errors in precipitation measurements are studied in this paper. A correction method, especially for wind-induced errors, is developed. The results prove that a correlation of power function exists between the precipitation amount caught by the horizontal gauge and the absolute difference of observations implemented by the operational gauge and pit gauge. The correlation coefficient is 0.99. For operational observations, precipitation correction can be carried out only by parallel observation with a horizontal precipitation gauge. The precipitation accuracy after correction approaches that of the pit gauge. The correction method developed is simple and feasible.
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| 关 键 词： | 中国 降水量 测量误差 校正方法 |
| 收稿时间： | 2006-04-03 |
| 修稿时间： | 2006-09-16 |
Errors and correction of precipitation measurements in China |
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| Ren?Zhihua,Li?Mingqin.Errors and Correction of Precipitation Measurements in China[J].Advances in Atmospheric Sciences,2007,24(3):449-458. |
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| Authors: | Ren Zhihua Li Mingqin |
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| Institution: | National Meteorological Information Center, China Meteorological Administration, Beijing 100081,Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081 |
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| Abstract: | In order to discover the range of various errors in Chinese precipitation measurements and seek a correction method, 30 precipitation evaluation stations were set up countrywide before 1993. All the stations are reference stations in China. To seek a correction method for wind-induced error, a precipitation correction instrument called the "horizontal precipitation gauge" was devised beforehand. Field intercomparison observations regarding 29,000 precipitation events have been conducted using one pit gauge, two elevated operational gauges and one horizontal gauge at the above 30 stations. The range of precipitation measurement errors in China is obtained by analysis of intercomparison measurement results. The distribution of random errors and systematic errors in precipitation measurements are studied in this paper.A correction method, especially for wind-induced errors, is developed. The results prove that a correlation of power function exists between the precipitation amount caught by the horizontal gauge and the absolute difference of observations implemented by the operational gauge and pit gauge. The correlation coefficient is 0.99. For operational observations, precipitation correction can be carried out only by parallel observation with a horizontal precipitation gauge. The precipitation accuracy after correction approaches that of the pit gauge. The correction method developed is simple and feasible. |
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| Keywords: | precipitation evaluation stations intercomparison measurements precipitation measurement errors correction method |
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