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Airborne Radiometer Measurements Were Used to Validate Radar Rain Reflectivity Measurements

Utilization of Co-Incident Radiometer Measurements for the Calibration and Validation of Radar Observations of Precipitation Eastwood Im Jet Propulsion Laboratory GPM Radiometer Workshop August 30-31, 2001. Airborne Radiometer Measurements Were Used

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Airborne Radiometer Measurements Were Used to Validate Radar Rain Reflectivity Measurements

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  1. Utilization of Co-Incident Radiometer Measurements for the Calibration and Validation of Radar Observations of PrecipitationEastwood ImJet Propulsion LaboratoryGPM Radiometer WorkshopAugust 30-31, 2001

  2. Airborne Radiometer Measurements Were Used to Validate Radar Rain Reflectivity Measurements During TOGA-COARE, the co-aligned, nadir-pointing brightness temperature measurements obtained by AMPR (Advanced Microwave Precipitation radiometer), AMMR (Airborne Multichannel Microwave Radiometer), and the radiometer channel of ARMAR (Airborne Rain Mapping Radar) were used to validate the rain reflectivity profile measurements obtained by 14-GHz ARMAR radar instrument. TOGA-COARE, FEB 30, 1993, UT 23:33 - 23:39 Ref: Im, E. and A. Kitiyakara, 1994: Using brightness temperature measurements to verify radar reflectivity measurements obtained in TOGA COARE. Proc. TOGA COARE Science Data Workshop, Toulouse, France.

  3. 0.1˚ 6.0˚ TMI Measurements was Used to Validate PR Backscatter Measurements 9.7˚ 14.2˚ 18.0˚ • Co-aligned, rain-free PR and TMI measurements are used to determine PR surface backscatter dependence on wind. The results show excellent agreement with Seasat scatterometer (SASS) model function. • Ocean s0 can vary by several decibels over a 10 m/s change in wind speed. • TMI measurements can help to validate the PR reflectivity measurements as well as the deduced PIAs. Ref: L. Li, E. Im, S. L. Durden, and Z. Haddad, 2001: A surface wind model-based method to estimate rain-induced radar path attenuation over ocean. J. Atmos. Oceanic Technol., Submitted.

  4. Nadir-pointing radiometer for GPM Core: Considerations • Usual suspects: • Spacecraft resources: • Mass, power, data rate • EMI/EMC needs to be addressed: • Direct signal coupling of the radar and radiometer electronics • Radar IF • Out-of band noise • Harmonics and sub-harmonics • Radar returns may saturate/damage radiometer front-end because of “co-located” field-of-views: • Direct radar return power level • Out-of-band noise • Harmonics and sub-harmonics • Antenna pattern • Radar transmit & receive timings • Harmonics and sub-harmonics

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