GPM activities at NICT

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Francine Ball
5 years ago
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1 GPM activities at NICT Toshio Iguchi, Katsuhiro Nakagawa, and Hiroshi Hanado (NICT) Joint Workshop of Global Environment Observation Mission TKP GardenCity Takebashi, Tokyo, Japan, 7 January

2 NIST s roles DPR Level algorithm development Calibration and validation Calibration of DPR Development of active radar calibrator (ARC) (Hanado) Validation of algorithms Ground validation activities (Nakagawa) Collecting and analyzing GV data that help algorithm development.

3 DPR algorithm development team L DPR algorithm (at launch version) consists of the main module and 6 sub modules. Main module: Seto, Iguchi controls the overall flow of data processing among the other 6 modules. Preparation module: Yoshida, Kubota, Hanado Vertical module: Kubota, Awaka Classification module: Awaka, Chandra, Le SRT module: Meneghini, Seto, Liao, Tanelli, Durden DSD module: Seto, Kozu, Meneghini, Liao Solver module: Seto, Meneghini Synthetic data, Test: + Kwiatkowski, Kim

4 DPR L development activities International DPR L telecons or meetings were held once per months since Apr.. Apr., Jun., Aug., Oct., Nov. in, Jan., Mar., May, Jul., Aug., Nov. in, Jan. in Domestic DPR L meetings were held once a month. Jan., Feb., Mar., Apr., May, Jun., Aug., Sep., Oct., Dec. in, Jan., Feb., Apr., May, Jul., Aug., Oct., Nov., Dec. in, Jan. in Code submission to NASA PPS/JAXA MOSS Baseline code (Version ) was submitted in Jan. At launch code (Version ) was submitted in Dec.. Updated at launch code (Version ) was submitted by the end of Mar., Sep., Nov. and Dec.. Final at launch code (Version ) will be submitted on th Jan..

5 Summary of algorithm development At launch version of the DPR algorithm was submitted to JAXA and NAXA. The code is currently under test with simulated data sets. Early test results show that the retrieved estimates are comparable to PR estimates. Future activities Tuning of parameters Uncertainty and error analysis Implementation of proposed and advanced functions Wet surface SRT Texture module that corrects for the effect of non uniform beam filling. Evaluation of NUBF effect and development of compensation algorithm Creation of scientifically reliable models and tables: scattering tables, BB model, ice particle models, etc Revision of the ATBD

6 NICT activity for calibration and validation of DPR DPR Launch 6 DPR Radar Calibrators (RC) development DPR Radar Calibration Experiment Pre-launch GV Target: Algorithm Validation Dual Ka-band campaign observation Post-launch GV Target: Product Validation Quick Evaluation L+month L+6month NICT GV post-launch plan

7 Radar Calibrator (RC) development KuARC JAXA Tx(Pulse, CW) + Rx + Transponder 8 KaARC NICT Tx(Pulse,CW) + Rx + Transponder 6 KuARC JAXA Tx(Pulse, CW with variable amplitude) + Rx + Transponder KaARC JAXA Tx(Pulse, CW with variable amplitude) + Rx + Transponder KuTxRC NICT Tx(CW with variable amplitude) 8 6 KuRxRC NICT Rx (ch) 8 7 KaTxRC NICT Tx(CW with variable amplitude) 8 8 KaRxRC NICT Rx(ch) 8 Antenna for KuPR Tx for KuPR Rx for KuPR

8 NICT activity (FY FY) Radar Calibrator (RC) development FY FY FY Ground Validation FY Mobile ground based precipitation observation system development Surport for JAXA dual Ka radar system development Dual Ka radar system evaluation using COBRA and ground based DSD measurement Dual Ka radar observation campaign in Okinawa FY Dual Ka radar observation campaign in Tsukuba, Mt. Fuji and Nagaoka Sapporo campaign observation by the dual Ka radar system and mobile gound based precipitation observation system

Optical rain gauge (ORG) Parsivel (laser optical)

gauge(tip) Supersonic anemometer Thermo-hydrometer

9 Mobile ground based precipitation observation system Parsivel ORG <instrument> DVD Impact-type disdrometer Optical rain gauge (ORG) Parsivel (laser optical) disdrometer POSS Macro rain radar (MRR) Tipping bucket rain gauge(tip) Supersonic anemometer Thermo-hydrometer Ground-based Videosonde (with Yamaguchi Univ.) DVD MRR Tip Supersonic anemometer POSS Videosonde

10 Results (k Z relationship, Ground based DSD) Rainfall intensity category. All rain (.mm/h R)..mm/h < R <.mm/h. R.mm/h

11 DSD(Disdro) :Okinawa, R <.mm/h DSD(Disdro) :Tsukuba, R <.mm/h Results (cont.) DSD (Disdro) :Okinawa, All rainfall 6 DSD (Disdro) :MtFuji, All rainfall all rain DSD (Disdro) :Tsukuba, All rainfall 6 DSD (Disdro) :Nagaoka, All rainfall 6 DSD(Disdro) :MtFuji, R <.mm/h 6 < R <.mm/h 6 DSD(Disdro) :Nagaoka, R <.mm/h 6 DSD(Disdro) :Okinawa,.mm/h <= R DSD(Disdro) :Tsukuba,.mm/h <= R DSD(Disdro) :MtFuji,.mm/h <= R.mm/h R 6 DSD(Disdro) :Nagaoka,.mm/h <= R 6 6

12 Results (cont.) < R <.mm/h.mm/h R DRP L _ka / _ku = DRP L _ka / _ku =

13 NICT GPM GV post launch experiment Location: () Okinawa COBRA + Phased array radar + ground measurements () Kobe Phased array radar (Kobe + Suita) + ground measurements Target (Products): Z Direct comparison of Z ZDR D validation ρhv melting layer flag validation KDP R validation (w/ Z, ZDR data) Preparation: software () GPM Ground based radar match up () COBRA analysis tool (ZDR, ρhv, KDP) X-band phased array radar/ COBRA

14 NICT GPM GV post launch experiment DSD measurement by tethered balloon Video sonde type measurement up to several hundred meters 雪雨粒 MRR Mobile Precipitation Observation system Ka/Ku radar (modified RC) W-band radar (modified EarthCARE RC)

THE DUAL-FREQUENCY (13.6/35.5 GHz) Precipitation

THE DUAL-FREQUENCY (13.6/35.5 GHz) Precipitation 2612 IEEE TRANSACTIONS ON GEOSCIENCE AN REMOTE SENSING, VOL. 45, NO. 8, AUGUST 2007 Rain Retrieval Performance of a ual-frequency Precipitation Radar Technique With ifferential-attenuation Constraint Nanda