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Improved Aquarius Salinity Retrievals using Auxiliary Products
from the CONAE Microwave Radiometer (MWR)
W. Linwood JonesCentral Florida Remote Sensing Lab (CFRSL)
Mónica Rabolli Comision Nacional De Actividades Espaciales (CONAE)
5th Aquarius/SAC-D Science Meeting21-23 October, 2009
Buenos Aires, Argentina
Research Objective
• To provide cal/val of the ocean salinity measurements provided by the Aquarius L-band radiometer/scatterometer– To develop L-band radiometric brightness
temperature correction algorithms for ocean surface roughness, precipitation and sea ice concentration that are based upon MWR observations
– To perform inter-satellite radiometric (brightness temperature) calibration between MWR and WindSat/TRMM Microwave Imager
CFRSL & CONAE Pre-Award Activities
– MOU in progress• Areas of Collaboration:
– Microwave remote sensing training– MWR radiometric calibration– Geophysical algorithm development
– Exchange of Personnel• CONAE: 3 engineers (4 man-weeks)• CFRSL Ph.D. student (5 weeks)
– CFRSL Fulbright scholar MS thesis• Inter-satellite radiometric calibration between MWR and WindSat• Simulated MWR data derived from WindSat
Technical Status
• Aquarius roughness correction based on MWR
• MWR rain retrieval algorithm
AQ Salinity Measurement (Tb) Error Budget
37 GHz
24 GHz
AQ Scatterometer Provides Baseline Roughness Correction
MWR can provide independent AQ roughness correction by retrieving surface wind speed and using L-band radiative transfer model
Simon Yueh, JPL
Alternative MWR to AQ Ocean Roughness Correction RTM
H-pol
V-pol
MWR can provide independent AQ roughness (Tb) correction by direct correlation
MWR Oceanic Rain Rate Retrieval
• Statistical Rain rate retrieval
• Based upon excess brightness temperature
• Trtm – radiation transfer model (NCEP input pars)
• Empirical Tex-RR relationship• Tuned to WindSat rain rate retrievals
),,( WVWSSSTTTT rtmmeasex
WindSat Tmeas
RTM TB Tex
Tex for WindSat SDR: 37GHz H-Pol
kelvin kelvin kelvin
WindSat Rain Rate
Tex for 37 GHz V-POL
Tex for 37 GHz H-POL
Tex for 23 GHz V-POL
Excess-TB and SRR Relationship
kelvin
kelvin
mm/hr
kelvin
ΔTex-IRR RelationshipΔ
TB,
Kel
vin
ΔT
B,
Kel
vin
ΔT
B,
Kel
vin
Integrated Rain Rate, km*mm/hr
23.8 GHz V-Pol
37 GHz V-Pol
37 GHz H-Pol
Weighted Average IRR
kji
IRRkIRRjIRRiIRR VVH
trieval
8.235.365.36Re
Potential AQ Rain Rate Correction Issue
• Rain attenuation introduces negligible Tb error
• However, for convective rain cells, associated ocean roughness effects may result
• Post-launch we will collect 3-way AQ, MWR and TRMM Precipitation Radar match-ups to assess effect
Synthetic Aperture Radar Backscatter Image of Tropical Rain Cells
Scale: 25 km
Future Pre-launch Activities
• MWR radiometric calibration– Deliver to CONAE independent analysis of TV
radiometric calibration
– Deliver to CONAE post-launch radiometric calibration algorithms
• MWR L1/L2 simulation– Deliver forward radiation transfer model
– Deliver V-0 wind speed retrieval ATBD
– Deliver V-0 rain rate retrieval ATBD
• Develop preliminary AQ roughness correction algorithm