The Hyperspectral Environmental Suite (HES) UW-Madison Satellite Direct Readout Users Conference for the Americas 12 December 2002 Timothy J. Schmit NOAA/NESDIS/STAR.

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Presentation transcript:

The Hyperspectral Environmental Suite (HES) UW-Madison Satellite Direct Readout Users Conference for the Americas 12 December 2002 Timothy J. Schmit NOAA/NESDIS/STAR (formerly ORA) SaTellite Applications and Research (STAR) Advanced Satellite Products Team (ASPT) in collaboration with the Cooperative Institute for Meteorological Satellite Studies (CIMSS) Madison, WI

Roadmap What is HES? Summary of Current GOES Sounder Review select high-spectral IR instruments Details of HES Summary

GOES Launch Planning * * Based on FY03 DOC Submission ABS=Advanced Baseline Sounder HES=Hyperspectral Environmental Suite

The road to HES (the next generation GOES sounder) VAS (geo experimental) GOES Sounder (geo operational) GIFTS (geo experimental) (12) (18) (~1600) HES (geo operational) time (# of spectral bands) VTPR, HIRS (leo operational) CrIS (leo operational) IASI (leo operational) AIRS (leo operational) HIS (airborne experimental) IRIS (leo experimental) (~2400) (~3600) IMG (leo experimental) NAST-I (airborne experimental)

Future GOES Future GOES will address all four key remote sensing areas * spatial resolution – what picture element size is required to identify feature of interest and to capture its spatial variability; * spectral coverage and resolution – what part of EM spectrum at each spatial element should be measured, and with what spectral resolution, to analyze an atmospheric or surface parameter; * temporal resolution – how often does feature of interest need to be observed; and * radiometric resolution – what signal to noise is required and how accurate does an observation need to be.

Current GOES Sounder has very limited geographical coverage (e.g., no coverage in the Southern Hemisphere) TPW example

GOES Sounder Spectral Bands: 14.7 to 3.7 um and visible

Record Earliest Tornado at Milwaukee, WI on 8 Mar 2000 The GOES-8 Sounder monitors important precursors to the event. moist axis dry slot (dark areas) Retrieval correctly subtracting moisture aloft (within the mid-level dry intrusion) Retrieval correctly adding moisture in the lower levels (within the moist axis) GOES Retrieval First Guess (S.E. WI)

NWS Forecast Office Assessment of GOES Sounder Atmospheric Instability Summer 1999 assessment of usefulness of hourly LI, CAPE, & CINH product for predicting location/timing of thunderstorms There were 248 valid weather cases. - Significant Positive Impact (30%) - Slight Positive Impact (49%) - No Discernible Impact (19%) - Slight Negative Impact (2%) - Significant Negative Impact (0) Figure from the National Weather Service, Office of Services

COLLIMATOR FOCAL PLANESPHERETELESCOPE SCAN MIRROR EXIT SLIT FOCAL PLANE HgCdTe FOCAL PLANE ENTRANCE SLIT AFOCAL RELAY GRATING SCHMIDT MIRROR FOLD MIRROR RELAY GRATING ORDER SELECTION via Bandpass Filters Grating Dispersion Spectral filters at each entrance slit and over each FPA array isolate color band (grating order) of interest Instrument Hyperspectral radiometer with resolution of 0.5 – 2 cm -1 Extremely well calibrated pre-launch Spectral range: 650 – 2700 cm -1 Associated microwave instruments (AMSU, HSB) Goals Improve medium range weather forecasting and Provide long-term climate record via (1) hyperspectral infrared radiances (2) retrieved products such as T(z), Q(z), O 3, CO, cloud properties, etc. Will greatly enhance soundings of temperature and humidity (1K/1km, 20%/2km) Has extremely “clean” SST channels in the 2600 cm -1 region Supports NOAA/NCEP’s operational requirements. Data provided to assimilation centers. Precursor to future advanced high spectral resolution sounders (IASI, CrIS, GIFTS) Design Grating Spectrometer passively cooled to 160K, stabilized to 30 mK PV and PC HdCdTe focal plane cooled to 60K with redundant active pulse tube cryogenic coolers Focal plane has ~5000 detectors, 2378 channels. PV detectors (all below 13 microns) are doubly redundant. Two channels per resolution element (n/Dn = 1200) 310 K Blackbody and space view provides radiometric calibration Paralyene coating on calibration mirror and upwelling radiation provides spectral calibration NEDT (per resolution element) ranges from 0.05K to 0.5K temperature weighting functions sorted by pressure of their peak (blue = 0) AIRS

Global High Spectral Resolution Observations from AIRS 20-July-2002 Ascending LW_Window

Water Vapor 6.7µm Band (Low vs High Spectral resolutions

AIRS observations of tropical storm Isadore on 22 Sept ~19:12-19:18 UTC ~999 1/cm radiances Brightness temperature spectra

GIFTS GIFTS 4-d Digital Camera: Horizontal: Horizontal: Large area format Focal Plane detector Arrays Vertical: Vertical: Fourier Transform Spectrometer Time: Time: Geostationary Satellite New Technology for Atmospheric Temperature, Moisture, & Winds

GIFTS 2 Bands Spectral Measurements GIFTS Spectral Imaging Simulation Upper High Upper Low Middle Surface

Sounder Comparison (GOES-Current to ABS-Requirement) Coverage RateCONUS/hrSounding Disk/hr Horizontal Resolution - Sampling Distance10 km10 km - Individual Sounding30-50 km10 km Vertical resolution~3 km 1 km Accuracy Temperature2 deg. K 1 deg. K Relative Humidity20%10% CurrentRequirement 2012 launchNWS (and others) need an improved sounder

Areas within 62 degrees local zenith angle from GOES-East and GOES-West sub- satellite points are indicated. Threshold coverage rate calls for the 62 arc region, excluding half of over-lap, to be scanned each hour. Current GOES -E and -W sounder hourly coverage is also shown. Spatial Coverage: Current vs. ABS (UW/CIMSS)

HES following GIFTS use of spectrum HES Waveband (cm -1 )Wavelength (um) Unapodized spectral resolution (cm -1 ) 650 – – – –

Moisture Weighting Functions Pressure (hPa) Advanced Sounder (3074) GOES (18) UW/CIMSS High spectral resolution advanced sounder will have more and sharper weighting functions compared to current GOES sounder. Retrievals will have better vertical resolution.

The advanced sounder has more and sharper weighting functions UW/CIMSS These water vapor weighting functions reflect the radiance sensitivity of the specific channels to a water vapor % change at a specific level (equivalent to dR/dlnq scaled by dlnp). Moisture Weighting Functions Pressure Weighting Function Amplitude Wavenumber (cm-1)

Simulations of Low vs High Spectral Resolution Retrievals Geo-I gets <1 K rms for 1 km T(p) and <10% rms for 2 km RH(p) Temperature Moisture Strategy is (1) use all channels in a regression first guess and then (2) use sub-set of channels for physical retrieval

(UW/CIMSS) Strategy is (1) use all channels in a regression first guess and then (2) use sub-set of channels for physical retrieval

Detection of Temperature Inversions Possible with Interferometer Detection of inversions is critical for severe weather forecasting. Combined with improved low-level moisture depiction, key ingredients for night-time severe storm development can be monitored. Spikes down - Cooling with height Spikes up - Heating with height Texas Ontario Brightness Temperature (K) (low-level inversion) (No inversion) GOES Wavenumber (cm -1 )

Future GOES -- simulating the Advanced Baseline Sounder (ABS) performance (UW/CIMSS) ABS/HES Cloud Top Pressure Retrieval

HES addresses NWS Imager concerns by: scanning faster - temporal sampling improved - more regions scanned adding spectral resolution - to improve the vertical resolution of the retrievals Simulations show that the HES addresses NWS requirements for improved cloud, moisture, and surface products. Every product that is being produced from the current GOES Sounder will be improved with data from the HES! New products will be possible, especially when combined with higher temporal and spatial information from the ABI. Summary -- HES