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Precipitation Measurement Intercomparison in the Qilian Mountains, Northeastern Tibetan Plateau : Volume 9, Issue 2 (31/03/2015)

By Chen, R.

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Book Id: WPLBN0004023189
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Precipitation Measurement Intercomparison in the Qilian Mountains, Northeastern Tibetan Plateau : Volume 9, Issue 2 (31/03/2015)  
Author: Chen, R.
Volume: Vol. 9, Issue 2
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Kang, E., Yang, Y., Liu, Z., Song, Y., Chen, R., Han, C.,...Liu, J. (2015). Precipitation Measurement Intercomparison in the Qilian Mountains, Northeastern Tibetan Plateau : Volume 9, Issue 2 (31/03/2015). Retrieved from http://www.ebooklibrary.org/


Description
Description: Qilian Alpine Ecology and Hydrology Research Station, Key Laboratory of Inland River Ecohydrology, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China. Systematic errors in gauge-measured precipitation are well-known but no reports have come from the Tibet Plateau. An intercomparison experiment was carried out from September 2010 to September 2014 in the Hulu watershed, northeastern Tibet Plateau. Precipitation gauges included a Chinese standard precipitation gauge (CSPG), a CSPG with Alter shelter (Alter), a Pit type gauge with the CSPG (Pit) and a Double-Fence International Reference with Tretyakov shelter and CSPG (DFIR). The intercomparison experiments show that the Pit gauge caught 1% more rainfall, 2% more mixed precipitation, 4% less snowfall and 0.8% more precipitation (all types) than the DFIR from September 2012 to September 2014. The Pit caught 4% more rainfall, 21% more snow and 16% more mixed precipitation than the CSPG. The DFIR caught 3% more rainfall, 27% more snowfall, and 13% more mixed precipitation than the CSPG, respectively. For rain and mixed precipitation, the catch ratios (CRs) for the gauges are ranked as follows: CRPit > CRDFIR > CRAlter > CRCSPG. For snowfall, the CRs are ranked as follows: CRDFIR > CRPit > CRAlter > CRCSPG. Catch ratio vs. 10 m wind speed indicates that with increasing wind speed from 0 to 4.5 m s−1, the CRCSPG or CRAlter decreased slightly. For mixed precipitation, the ratios of DFIR/Alter or DFIR/Pit vs. wind speed show that wind speed has no significant effect on catch ratio below 3.5 m s−1. For snowfall, the ratio of CSPG/DFIR or Alter/DFIR vs. wind speed shows that catch ratio decreases with increasing wind speed. The calibration equations for three different precipitation types for the CSPG and Alter were established with 10 m wind speeds based on the CR vs. wind speed analysis. Results indicate that combined use of the DFIR and the Pit as reference gauges for snow and rainfall, respectively, could enhance precipitation observation precision. Applicable regions for the Pit gauge or the DFIR as representative gauges for all precipitation types are present in China.

Summary
Precipitation measurement intercomparison in the Qilian Mountains, Northeastern Tibetan Plateau

Excerpt
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