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자료유형
학술저널
저자정보
저널정보
한국기상학회 Asia-Pacific Journal of Atmospheric Sciences Journal of the Korean Meteorological Society Vol.43 No.1
발행연도
2007.2
수록면
41 - 57 (17page)

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Using a set of long-term disdrometric data measured by the Precipitation Occurrence Sensor System (POSS) at a mid-latitude environment (Montreal, Canada), the effects of drop deformation on precipitation measurements with polarimetric parameters are explored. The various polarimetric parameters are calculated from filtered drop size distributions (DSDs) with different formulas of drop deformation using a scattering model. A systematic comparison of the derived parameters is then performed to investigate the impact of different drop deformations on precipitation estimates. As indicated by the variation of the value of b (4.4~5.3) in the best fit of K<SUB>DP</SUB> =aD<SUP>b</SUP>, K<SUB>DP</SUB> is highly dependent on the drop deformation, leading to significant random errors in the estimation of R when K<SUB>DP</SUB> is included in relationships between R and polarimetric parameters. This is due to the effectiveness of DP K in explaining the variability of DSDs. Similarly, the shorter wavelengths are less subject to the DSD variability. However, the random error in the estimation of R with any combination of Z<SUB>h</SUB> and Z<SUB>DR</SUB> is nearly insensitive to the drop deformation. The systematic variation of K<SUB>DP</SUB> and Z<SUB>DR</SUB> that depends on different drop deformations may yield significant biases (7% to 110%: under- or over-estimation). This result underlines the importance of a correct knowledge on drop shape in precipitation estimation with polarimetric radar.

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Abstract
1. Introduction
2. Data used
3. Drop deformation formulas suggested in the literature
4. Polarimetric parameters and diameter relationships
5. Polarimetric parameters from observed average DSDs
6. Bias and random errors due to an assumed drop deformation
7. Conclusions
Acknowledgement
REFERENCES

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