| 摘要 |
PROBLEM TO BE SOLVED: To determine the category of rainfall particles from observation parameters and allow high precision calculation of the rainfall rate by a method suitable for each category. SOLUTION: Dual polarization observation is performed by simultaneously transmitting and receiving radar waves of a horizontally polarized wave and a vertically polarized wave to prepare a radar reflectivity factor (Z), a differential radar reflectivity factor (Z<SB>DR</SB>), a specific inter-polarization differential phase (K<SB>DP</SB>), and an inter-polarization correlation coefficient (ρ<SB>HV</SB>), as observation parameters. When calculating the rainfall, it is determined whether the category of the rainfall particles is the rain or the other categories from the value ofρ<SB>HV</SB>(S1). When it is determined as the "rain", after calculating the rainfall rate at a low spatial resolution by the K<SB>DP</SB>(S2), the rainfall rate at high resolution is calculated by also using the Z (S3). When it is determined as "the category other than rain" in S1, "snow", "hail" "melt layer" is determined from the Z, Z<SB>DR</SB>, K<SB>DP</SB>,ρ<SB>HV</SB>(S4). The rainfall rate is calculated by rainfall calculation parameters B,βprepared for each determined category (S5). Finally, the rainfall rate calculated in the S3 and the rainfall rate for each category in S4 are summed up (S6). COPYRIGHT: (C)2011,JPO&INPIT
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