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Statistical results of daily TRMM precipitation and gauge precipitation at station and basin scales during 1998–2013 are listed in Table 4. As can be seen, the mean daily TRMM precipitation is more than the mean daily gauge precipitation in most stations, except for stations No. 55293 and No. 56018. As a result, daily areal mean precipitation derived from TRMM precipitation is slightly more than that from gauge precipitation over the basin. This implies that TRMM precipitation overestimates precipitation in the Naqu River Basin, which is consistent with the findings from another study in the TP (Chen et al. 2013a, 2013b, 2013c). Meanwhile, maximum daily TRMM precipitation is noticeably more than maximum daily gauge precipitation, particularly at station scale. The possible reason is that as the gauge precipitation merely refers to a specific point it is more random and uncertain, and could easily miss the rainstorm center in comparison with TRMM precipitation, which is derived from the average value of the region with a range of 0.25 ° × 0.25 °. Moreover, the RMSE and BIAS corroborate that there is a clear difference between daily gauge precipitation and TRMM precipitation at station and basin scales.

Table 4

Summary of statistical results in comparison of daily TRMM precipitation with gauge precipitation at station and basin scales during 1998–2013

Gauge No./Basin5529455299560185610656109561165620256223Basin
Mean (mm) 
 Gauge 1.34 1.30 1.50 1.74 1.74 1.85 2.06 1.16 1.55 
 TRMM 1.20 1.59 1.43 2.06 2.28 1.96 2.42 2.06 1.86 
Maximum (mm) 
 Gauge 33.70 43.10 32.80 54.10 37.10 38.20 44.80 32.10 21.07 
 TRMM 78.75 57.15 68.37 76.68 79.86 62.34 81.06 63.06 31.35 
RMSE (mm) 4.36 4.69 4.18 5.55 5.79 5.31 6.12 5.13 3.03 
BIAS −0.10 0.23 −0.05 0.19 0.31 0.06 0.18 0.78 0.20 
Gauge No./Basin5529455299560185610656109561165620256223Basin
Mean (mm) 
 Gauge 1.34 1.30 1.50 1.74 1.74 1.85 2.06 1.16 1.55 
 TRMM 1.20 1.59 1.43 2.06 2.28 1.96 2.42 2.06 1.86 
Maximum (mm) 
 Gauge 33.70 43.10 32.80 54.10 37.10 38.20 44.80 32.10 21.07 
 TRMM 78.75 57.15 68.37 76.68 79.86 62.34 81.06 63.06 31.35 
RMSE (mm) 4.36 4.69 4.18 5.55 5.79 5.31 6.12 5.13 3.03 
BIAS −0.10 0.23 −0.05 0.19 0.31 0.06 0.18 0.78 0.20 

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