Correction of TRMM PR Surface Rainfall Rates over the Tibetan Plateau

Li Jiarui; Lu Naimeng; Gu Songyan

doi:10.11898/1001-7313.20150513

Vol.26, NO.5, 2015

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Article Navigation > Journal of Applied Meteorological Science > 2015 > 26(5): 636-640

Li Jiarui, Lu Naimeng, Gu Songyan. Correction of TRMM PR surface rainfall rates over the Tibetan Plateau. J Appl Meteor Sci, 2015, 26(5): 636-640. DOI: 10.11898/1001-7313.20150513.

Citation:

Li Jiarui, Lu Naimeng, Gu Songyan. Correction of TRMM PR surface rainfall rates over the Tibetan Plateau. J Appl Meteor Sci, 2015, 26(5): 636-640. DOI: 10.11898/1001-7313.20150513.

Li Jiarui, Lu Naimeng, Gu Songyan. Correction of TRMM PR surface rainfall rates over the Tibetan Plateau. J Appl Meteor Sci, 2015, 26(5): 636-640. DOI: 10.11898/1001-7313.20150513.

Citation:

Li Jiarui, Lu Naimeng, Gu Songyan. Correction of TRMM PR surface rainfall rates over the Tibetan Plateau. J Appl Meteor Sci, 2015, 26(5): 636-640. DOI: 10.11898/1001-7313.20150513.

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Correction of TRMM PR Surface Rainfall Rates over the Tibetan Plateau

DOI: 10.11898/1001-7313.20150513

1.
Chinese Academy of Meteorological Sciences, Beijing 100081
2.
National Satellite Meteorological Center, Beijing 100081

Received Date: 2015-01-09
Rev Recd Date: 2015-05-28
Publish Date: 2015-09-30

Abstract

Abstract

In order to reveal and improve the accuracy of surface rainfall rates derived from precipitation radar (PR) on TRMM satellite over the Tibetan Plateau, TRMM PR 2A25 products and hourly rain gauge data from 2005 to 2007 are compared.Results show that PR has a relative error of-35% in stratiform rain and 42% in convective rain over the Tibetan Plateau.The applicability of Z-R relation is one of the cause for the bias of PR.Based on the analysis, the initial coefficients A and b in Z-R relations at 20℃ level are modified to 0.0288 and 0.6752 for stratiform rain, respectively, also modified to 0.0406 and 0.5809 for convective rain, thus the Z-R relation at different altitudes between 0℃ and 20℃ height are updated. Results suggest that the modified models can achieve better accuracy in estimating surface rainfall rates over the Tibetan Plateau.
- the Tibetan Plateau;
- TRMM PR;
- rain gauge;
- surface rainfall rates;
- Z-R relation

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References(15)

Figures and Tables

图 1 TRMM PR降水模型调整前后近地面雷达反射率因子Z与估算地面降雨率R的关系

(a) 层云降水，(b) 对流云降水

Fig. 1 The Z-R relationship of TRMM PR at near-surface level before and after the correction

(a) stratiform rain, (b) convective rain

DownLoad: Full-Size Img PowerPoint

图 2 2007年TRMM PR地面降雨率的均方根误差在降水模型修正前与修正后变化特征

Fig. 2 Average root mean square error of TRMM PR surface rainfall rates before and after the correction in 2007

DownLoad: Full-Size Img PowerPoint

表 1 PR地面降雨率与雨量计资料对比

Table 1 The comparison of PR surface rainfall rates and rain gauge rainfall rates for different rain types

降水类型相关系数
(显著性水平α=0.05) 均方根误差/(mm·h^-1) 相对误差/%

层云降水 0.64 1.02 -35

对流云降水 0.37 1.40 42

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表 2 PR降水模型中20℃层初始Z-R关系系数

Table 2 Initial Z-R parameters at 20℃ level in the PR rain-profiling model

降水模型层云降水对流云降水

A b A b

修正前^[14] 0.0246 0.6680 0.0421 0.6311

修正后 0.0288 0.6752 0.0406 0.5809

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References

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