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Reclassification of KuPR in DPR V06 with Slope Method

Study on reclassification of Ku-band precipitation radar in DPR V06 using the "Slope Method" for stratiform categorization. Explore exceptions like shallow rain and heavy ice precipitation, with a focus on modification of precipitation types. Data analysis with GPM 2AKu V06A from October 1 to 9. Cold front near Hawaii is also considered in the analysis.

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Reclassification of KuPR in DPR V06 with Slope Method

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  1. A study on reclassification of KuPR in DPR V06 By Hiroki Tsuji U. Tokyo with Yukari N. Takayabu 10/16/2018

  2. Reclassification to stratiform with “Slope Method” (b) Case for Z becomes noise above 1.5km from the base altitude • Usual case “Slope” is examined for convective precipitations. If Slope >= 7.5 dBZ/km, the type is reclassified as stratiform. Exceptions to apply the Slope method: shallow rain, heavy ice precipitation, and large Z detected even BB exists (??:yukari) Slope Method is applied using zFactorNPCorrected, after the second loop of the Ku-band single frequency process.

  3. Modification of precipitation types for V06, with the application of “slope method” by Awaka Stratiform

  4. Ocean, number of pixels threshold = 40 mm/h sta1 : stratiform(Vraintype=1) sta4 : reclassified (Vraintype=4) sta1_40: stratiform, NSPR≥ 40 mm/h sta4_40: reclassified, NSPR≥ 40 mm/h Data : GPM 2AKu V06A 2018 10/1 – 10/9

  5. Ocean, number of pixels threshold = 20 mm/h sta1 : stratiform(Vraintype=1) sta4 : reclassified (Vraintype=4) sta1_40: stratiform, NSPR≥ 40 mm/h sta4_40: reclassified, NSPR≥ 40 mm/h Data : GPM 2AKu V06A 2018 10/1 – 10/9

  6. Ocean, precipitation amount threshold = 40 mm/h sta1 : stratiform(Vraintype=1) sta4 : reclassified (Vraintype=4) sta1_40: stratiform, NSPR≥ 40 mm/h sta4_40: reclassified, NSPR≥ 40 mm/h Data : GPM 2AKu V06A 2018 10/1 – 10/9

  7. Ocean, precipitation amount threshold = 20 mm/h sta1 : stratiform(Vraintype=1) sta4 : reclassified (Vraintype=4) sta1_40: stratiform, NSPR≥ 40 mm/h sta4_40: reclassified, NSPR≥ 40 mm/h Data : GPM 2AKu V06A 2018 10/1 – 10/9

  8. Land, number of pixels threshold = 40 mm/h sta1 : stratiform(Vraintype=1) sta4 : reclassified (Vraintype=4) sta1_40: stratiform, NSPR≥ 40 mm/h sta4_40: reclassified, NSPR≥ 40 mm/h Data : GPM 2AKu V06A 2018 10/1 – 10/9

  9. Land, number of pixels threshold = 20 mm/h sta1 : stratiform(Vraintype=1) sta4 : reclassified (Vraintype=4) sta1_40: stratiform, NSPR≥ 40 mm/h sta4_40: reclassified, NSPR≥ 40 mm/h Data : GPM 2AKu V06A 2018 10/1 – 10/9

  10. Land, precipitation amount threshold = 40 mm/h sta1 : stratiform(Vraintype=1) sta4 : reclassified (Vraintype=4) sta1_40: stratiform, NSPR≥ 40 mm/h sta4_40: reclassified, NSPR≥ 40 mm/h Data : GPM 2AKu V06A 2018 10/1 – 10/9

  11. Land, precipitation amount threshold = 20 mm/h sta1 : stratiform(Vraintype=1) sta4 : reclassified (Vraintype=4) sta1_40: stratiform, NSPR≥ 40 mm/h sta4_40: reclassified, NSPR≥ 40 mm/h Data : GPM 2AKu V06A 2018 10/1 – 10/9

  12. Reclassified pixels (Vraintype=4)with Precip≧20 mm/h ●：20-40 mm/h △：40-60 mm/h ×：60- mm/h [mm/h]

  13. Stratiform pixels (Vraintype=1)with Precip≧20 mm/h ●：20-40 mm/h △：40-60 mm/h ×：60- mm/h [mm/h]

  14. Cold front near Hawaii

  15. Cold front near Hawaii

  16. Cold front near Hawaii

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