Plateau Meteorology

Plateau Meteorology >

2017 , Vol. 36 >Issue 4: 950 - 959

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00071

Spatial-Temporal Validation of TRMM 3B42V7 Precipitation Products and Analysis of Precipitation Characteristics in the Upper Reaches of Nujiang River

  • LI Meng ,
  • QIN Tianling ,
  • LIU Shaohua ,
  • LU Yajing
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  • State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Institute of Water Resources and Hydropower Research(IWHR), Beijing 100038, China

Received date: 2016-01-26

  Online published: 2017-08-28

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Abstract

The Nujiang river is a typical area of lacking data with complicated terrain and climate characteristics. TRMM (Tropical Rainfall Measuring Mission) precipitation data can effectively describe the spatial distribution characteristics of regional precipitation, and it has great reference value to the area of lacking information. We use TRMM 3B42V7 data and 18 weather stations data to explore the spatial and temporal distribution characteristics of precipitation and analyze the accuracy of TRMM 3B42V7 data in the upper reaches of Nujiang river. The correlation coefficient method and spatial analysis method are used to solve the problem. By analyzing the correlation coefficient, it shows that the best correlation coefficient between TRMM 3B42V7 data and the site observation data occurs at monthly scale (R>0. 9), second is yearly scale (R>0. 5), the worst is daily scale (R < 0. 5). The two sets of data have strong correlation under monthly scale when it comes to areal precipitation (R≈0. 98). Time series also fit well though TRMM 3B42V7 data is slightly larger than the site observation data in the month of abundant precipitation. Spatial-temporal comparative analysis indicates that precipitation spatial distribution has good consistency of these two group data at different time scales though the local distribution characteristics are different. There is an underestimation tendency of TRMM 3B42V7 data in the northwest of the basin, and overestimation tendency in the southeast. Precipitation in most other area has little difference between TRMM 3B42V7 data and the site observation data. TRMM 3B42V7 data is also used to analyze the seasonal proportion of precipitation in the basin and it is found that seasonal patterns of precipitation in study area vary greatly. Precipitation in summer (from June to August) account for a large proportion of total annual precipitation. The ratio of precipitation in summer is 42%~72%, while the total ratios of spring (from March to May), autumn (from September to November) and winter (from December to February) to annual precipitation are 28%~58%.

Key words： Upper reaches of Nuj; TRMM 3B42V7; Precipitation; Spatial-temporal dis; Accuracy analysis

Cite this article

LI Meng , QIN Tianling , LIU Shaohua , LU Yajing . Spatial-Temporal Validation of TRMM 3B42V7 Precipitation Products and Analysis of Precipitation Characteristics in the Upper Reaches of Nujiang River[J]. Plateau Meteorology, 2017 , 36(4) : 950 -959 . DOI: 10.7522/j.issn.1000-0534.2016.00071

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