Aquarius Algorithm Workshop

March 9-11, 2010Santa Rosa, CA

Aquarius Level-2 Data Products

Fred Patt

2 of 15March 9-11, 2010

ADPS Overview and StatusAquarius Algorithm Workshop

Level-2 Product Overview

• Level-2 data consists of retrieved geophysical parameters at the sensor resolution, with geolocation fields appended..

• Each Aquarius Level-2 file contains 1 orbit (starting at the South Pole crossing).

• Aquarius products are formatted using HDF5:– Machine-independent, hierarchical, self describing format– Attributes contain descriptive information about the entire file or

individual objects within the file– Groups provide logical association and hierarchy– Data objects are multidimensional arrays of standards types

3 of 15March 9-11, 2010

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Aquarius Level-2 Product Content

• This will actually be a combined Level 1B / Level 2, radiometer/scatterometer product.

• The current product specification incorporates updated parameter lists based on the recent code deliveries from the radiometer and scatterometer teams.

• Specific parameters to be output are configurable at runtime.• Parameters are output per beam and block (1.44 sec)• All output products include standard metadata, flags and

geolocation fields.

4 of 15March 9-11, 2010

ADPS Overview and StatusAquarius Algorithm Workshop

Today’s Objectives

• Review and agree on the list of output parameters to be used for the initial year (2007) of simulated data products, and the mission simulation. It is understood that this will continue to evolve between now and launch.

• Set target dates and agree on responsibilities for incorporating all outputs into the Level 1A-to-2 processing software.

5 of 15March 9-11, 2010

ADPS Overview and StatusAquarius Algorithm Workshop

Radiometer Parameters (1 of 2)

Name Long Name Implementation

rad_TaH Radiometer Ta H polarization Currentrad_TaV Radiometer Ta V polarization Currentrad_Ta3 Radiometer Ta 3rd Stokes Current

rad_toi_HRadiometer Top of the Ionosphere Tb H polarization

Current

rad_toi_VRadiometer Top of the Ionosphere Tb V polarization

Current

rad_toi_3Radiometer Top of the Ionosphere Tb +45 polarization

Current

rad_toa_HRadiometer Top of the Atmosphere Tb H polarization

Current

rad_toa_VRadiometer Top of the Atmosphere Tb V polarization

Current

rad_far_TaH Radiometer Faraday Angle Currentrad_TbH Earth surface Tb H polarization Currentrad_TbV Earth surface Tb V polarization CurrentSSS Sea Surface Salinity Current

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Radiometer Parameters (2 of 2)

Name Long Name Implementationrad_galact_Ta_dir_V Radiometer galactic direct correction V polarization Currentrad_galact_Ta_dir_H Radiometer galactic direct correction H polarization Currentrad_galact_Ta_dir_3 Radiometer galactic direct correction 3rd Stokes Currentrad_galact_Ta_ref_V Radiometer galactic reflected correction V polarization Currentrad_galact_Ta_ref_H Radiometer galactic reflected correction H polarization Currentrad_galact_Ta_ref_3 Radiometer galactic reflected correction 3rd Stokes Currentrad_solar_Ta_dir_V Radiometer solar direct correction V polarization Currentrad_solar_Ta_dir_H Radiometer solar direct correction H polarization Currentrad_solar_Ta_dir_3 Radiometer solar direct correction 3rd Stokes Currentrad_solar_Ta_ref_V Radiometer solar reflected correction V polarization Currentrad_solar_Ta_ref_H Radiometer solar reflected correction H polarization Currentrad_solar_Ta_ref_3 Radiometer solar reflected correction 3rd Stokes Currentrad_rain_Tb Rain effect on brightness temperature Discussrad_moon_Ta Lunar effect on antenna temperature Discussrad_rough_corr Derived wind and/or roughness correction Discussscat_rough_corr Scatterometer-based TB roughness correction Discussrad_o2_wv_abs O2/water vapor absorption Discussrad_atm_emiss Atmospheric emission Discussrad_cosmic_Ta Radiometer Cosmic Ta correction Discuss

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Scatterometer Parameters (1 of 2)

Name Long Name Implementation

scat_VV_antTOI Scatterometer normalized radar cross-section (NRCS) for VV polarization

Current

scat_HH_ant TOI Scatterometer NRCS for HH polarization Currentscat_HV_ant TOI Scatterometer NRCS for HV polarization Currentscat_VH_ant TOI Scatterometer NRCS for VH polarization Current

scat_VV_TOAScatterometer NRCS for VV polarization after Faraday rotation correction

Current

scat_HH_TOAScatterometer NRCS for HH polarization after Faraday rotation correction

Current

scat_HV_TOAScatterometer NRCS for HV polarization after Faraday rotation correction

Current

scat_VH_TOAScatterometer NRCS for VH polarization after Faraday rotation correction

Current

scat_wind_speed Scatterometer wind speed Current

8 of 15March 9-11, 2010

ADPS Overview and StatusAquarius Algorithm Workshop

Scatterometer Parameters (2 of 2)

Name Long Name Implementation

dTB_VDelta Tb derived from scatterometer data for V polarization and beam

Planned

dTB_HDelta Tb derived from scatterometer data for H polarization and beam

Planned

Kpc_VV Kpc statistical uncertainty for VV NRCS PlannedKpc_HH Kpc statistical uncertainty for HH NRCS PlannedKpc_HV Kpc statistical uncertainty for HV NRCS PlannedKpc_VH Kpc statistical uncertainty for VH NRCS Plannedwind_uncertainty Estimated wind speed error PlanneddTB_V_uncertainty Uncertainty in delta-Tb-V PlanneddTB_H_uncertainty Uncertainty in delta-Tb-H Plannedscat_total NRCS for total power PlannedKpc_total Statistical uncertainty for total power NRCS Planned

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Ancillary Data Parameters (1 of 2)

Name Long NameImplementatio

nanc_wind_speed

Surface wind speed Current

anc_wind_dir Surface wind direction Currentanc_surtemp Surface temperature (SST or LST) Currentanc_SSS Ancillary sea surface salinity Currentanc_mean_flux

Mean solar flux Current

anc_trans Transmittance Currentanc_Tb_up Upwelling atmospheric brightness temperature Currentanc_Tb_dw Downwelling atmospheric brightness temperature Currentrad_land_frac Fraction of land contamination (radiometer) Currentrad_ice_frac Fraction of ice contamination (radiometer) Currentscat_land_frac

Fraction of land contamination (scatterometer) Current

scat_ice_frac Fraction of ice contamination (scatterometer) Current

10 of 15March 9-11, 2010

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Ancillary Data Parameters (2 of 2)

Name Long NameImplementatio

nrad_sim_TaH Estimated TaH from ancillary salinity Plannedrad_sim_TaV Estimated TaV from ancillary salinity Plannedrad_sim_TbH Estimated TbH from ancillary salinity Plannedrad_sim_TbV Estimated TbV from ancillary salinity Plannedanc_cloud_water Water content of the atmosphere Discussanc_SWH Surface wave height Discussanc_peak_flux Peak solar flux Discussanc_LSM Land soil moisture Discussanc_ionosphere Ionospheric data Discussanc_rough_H Ancillary wind-based roughness, H-pol Discussanc_rough_V Ancillary wind-based roughness, V-pol Discussgal_fraction Fraction of reflected galactic contamination Discuss

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MWR Parameters

Name Long NameImplementatio

nMWR_23.8_V 23.8 Ghz signal from MWR PostlaunchMWR_36.5_H 36.5 Ghz H signal from MWR PostlaunchMWR_36.5_V 36.5 Ghz V signal from MWR PostlaunchMWR_36.5_P 36.5 Ghz P signal from MWR PostlaunchMWR_36.5_M 36.5 Ghz M signal from MWR PostlaunchMWR_wind_speed Surface wind speed from MWR PostlaunchMWR_wind_dir Surface wind direction from MWR PostlaunchMWR_rain_rate Rain rate from MWR PostlaunchMWR_ice_flag Sea ice flag from MWR PostlaunchMWR_ice_concen Sea ice concentration from WMR Postlaunch

12 of 15March 9-11, 2010

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Geolocation Parameters

Name* Long NameImplementatio

norb_pos Orbit position vector Currentorb_vel Orbit velocity vector Currentatt_ang Spacecraft roll, pitch, yaw Currentsun_ref Sun reference vector Plannedbeam_clat* Beam center latitude Currentbeam_clon* Beam center longitude Currentbeam_elat* Beam ellipse latitude (-3db) Plannedbeam_elon* Beam ellipse longitude (-3db) Plannedbeam_ra* Beam right ascension (J2000) Plannedbeam_dec* Beam declination (J2000) Plannedincidence_ang* Incidence angle Plannedbeam_azimuth* Beam azimuth Plannedpolarization_roll* Polarization roll angle Planneddoppler_shift* Doppler frequency shift Planned*Separate fields for radiometer, scatterometer, MWR

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Data Quality Flags

• Processing flags to be stored in byte arrays with dimensions of (blocks x beams) with bits set for each condition (e.g., land).

• RFI flags to be stored in byte arrays with 1 bit for each of the signals in the subcycle.

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Radiometer Flags

Bits Set Condition Indicated Implementation1 – 2 RFI Planned3 – 4 Rain in main beam Planned5 – 6 Land contamination Current7 – 8 Sea ice contamination Planned9 – 10 Wind and foam contamination Planned11 – 12 Unusual antenna brightness temperature Planned13 – 14 Mean solar flux contamination Planned15 – 16 Peak solar flare contamination Planned17 – 18 Illuminated ocean in main beam Planned19 – 20 Moon contamination Planned21 – 22 Galactic background contamination Planned23 – 24 Gain jump Planned25 – 32 Spares

15 of 15March 9-11, 2010

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Scatterometer Flags

Bits Set Condition Indicated Implementation(MSB) 31 – 28

RFI corruption of signal (V-pol bits 31:30, H-pol bits 29-28)

Planned

27 – 26 Rain in main beam Planned25 – 22 Negative power computed for sigma-0 Planned21 – 20 Non-nominal attitude or cold sky maneuver Planned19 – 16 Successful Faraday rotation removal Planned15 – 00 (LSB) Spares