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MIPAS Products User Guide

MIPAS Products and Algorithms

The MIPAS Instrument

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Index

1 MIPAS Products User Guide
1.1 How to Choose MIPAS Data?
1.1.1 Geophysical measurements
1.1.2 Scientific background
1.1.2.1 Heritage of MIPAS
1.1.2.2 Atmospheric Chemistry
1.1.3 Principles of measurement
1.1.3.1 Overview
1.1.3.2 Detector and spectral ranges
1.1.3.3 Sampling the interferograms
1.1.3.4 Calibration measurements
1.1.3.4.1 Offset measurement
1.1.3.4.2 Gain measurement
1.1.3.5 Onboard processing
1.1.3.6 Ground processing
1.1.3.7 Spatial coverage
1.1.4 Geophysical coverage
1.1.4.1 Overview
1.1.4.1.1 Basic principles of a Fourier transform spectrometer
1.1.4.2 Pointing
1.1.4.3 Spatial coverage
1.1.4.4 Temporal coverage
1.1.4.5 Observation modes
1.1.5 Peculiarities of MIPAS
1.1.6 Summary of applications and products
1.2 How to use MIPAS data?
1.2.1 Software Tools
1.2.1.1 General tools
1.2.1.2 EnviView
1.2.1.3 MIPAS specific software tools
1.3 Further reading
1.4 Image gallery
2 MIPAS Products and Algorithms
2.1 Introduction
2.2 Definition and convention
2.3 Product evolution history
2.4 Algorithms and products
2.4.1 Level 0 products and algorithms
2.4.1.1 Decimation and filtering
2.4.1.2 Word length reduction
2.4.1.3 Data compression
2.4.1.4 Formatting into instrument source packets
2.4.2 Level 1a intermediary products and algorithms
2.4.2.1 Load Data function
2.4.3 Level 1b products and algorithms
2.4.3.1 Algorithms
2.4.3.1.1 Calculate Offset Calibration function
2.4.3.1.2 Calculate Gain Calibration function
2.4.3.1.3 Calculate Spectral Calibration function
2.4.3.1.4 Calculate Spectral Radiance function
2.4.3.1.5 Calculate ILS Retrieval function
2.4.3.1.6 Calculate Pointing function
2.4.3.1.7 Calculate Geolocation function
2.4.3.1.8 Detection and correction of spikes
2.4.3.1.9 Detection and correction of fringe count errors
2.4.3.1.10 Correct non-linearity function
2.4.3.1.11 Responsivity scaling
2.4.3.2 Products
2.4.3.2.1 High level organisation
2.4.3.2.2 Product header
2.4.3.2.2.1 Main product header
2.4.3.2.2.2 Specific product header
2.4.3.2.2.3 Data set descriptor
2.4.3.2.3 Summary quality ADS
2.4.3.2.4 Geolocation ADS
2.4.3.2.5 Structure ADS
2.4.3.2.6 Level 1b measurement data set
2.4.3.2.7 Scan information ADS
2.4.3.2.8 Offset calibration ADS
2.4.3.2.9 Gain calibration ADS#1
2.4.3.2.10 Gain calibration ADS#2
2.4.3.2.11 ILS and spectral calibration GADS
2.4.3.2.12 LOS calibration GADS
2.4.3.2.13 Processing parameters GADS
2.4.4 Level 2 products and algorithms
2.4.4.1 Algorithms
2.4.4.1.1 Introduction
2.4.4.1.1.1 Level 2 Algorithms Theoretical Baseline Document (ATBD)
2.4.4.1.2 The Level 2 pre-processor
2.4.4.1.2.1 The Initial Guess Processor
2.4.4.1.3 The retrieval modules
2.4.4.1.3.1 General features of the adopted approach
2.4.4.1.3.1.1 Use of Microwindows
2.4.4.1.3.1.2 Sequential retrieval of the species
2.4.4.1.3.1.3 Global Fit analysis of the Limb-Scanning sequence
2.4.4.1.3.2 Mathematics of the retrieval
2.4.4.1.3.2.1 Details
2.4.4.1.3.3 Main components of the retrieval
2.4.4.1.3.3.1 Forward model
2.4.4.1.3.3.1.1 Dependence on spectral frequency
2.4.4.1.3.3.1.2 Ray-tracing and definition of the atmospheric layering
2.4.4.1.3.3.1.3 Computation of cross-sections
2.4.4.1.3.3.1.4 Computation of the radiative transfer integral
2.4.4.1.3.3.1.5 AILS convolution
2.4.4.1.3.3.1.6 Instrument field of view convolution
2.4.4.1.3.3.2 Jacobian calculation
2.4.4.1.3.3.3 Convergence criteria
2.4.4.1.3.4 Choices and assumptions in the forward and retrieval algorithms
2.4.4.1.3.4.1 Use of complementary information in the inversion model
2.4.4.1.3.4.2 Profile regularization
2.4.4.1.3.4.3 Levels versus layers
2.4.4.1.3.4.4 Retrieval vertical grid
2.4.4.1.3.4.5 Vertical resolution
2.4.4.1.3.4.6 Assumptions
2.4.4.1.3.5 Algorithm validation
2.4.4.1.3.6 Performances
2.4.4.1.3.6.1 Accuracy performance of Level 2 retrieval algorithm
2.4.4.1.3.6.2 Runtime performance
2.4.4.2 Products
2.4.4.2.1 Level 2 Products Description
2.4.4.2.1.1 Level 2 Product
2.4.4.2.1.2 Level 2 NRT /Meteo Product
2.4.4.2.1.3 Product Header
2.4.4.2.1.3.1 Main Product Header
2.4.4.2.1.3.2 Specific Product Header
2.4.4.2.1.3.3 Data Set Descriptors
2.4.4.2.1.4 Summary Quality ADS
2.4.4.2.1.5 Scan Geolocation ADS
2.4.4.2.1.6 Structure ADS
2.4.4.2.1.7 Scan Information MDS
2.4.4.2.1.8 PT Retrieval MDS
2.4.4.2.1.9 VMR Retrieval MDSs
2.4.4.2.1.10 Continuum and Offset MDS
2.4.4.2.1.11 PCD Information ADS
2.4.4.2.1.12 MW Occupation Matrix ADS
2.4.4.2.1.13 Residual Spectra ADS
2.4.4.2.1.14 Parameters ADS
2.4.4.2.2 Extraction of Profile Data from Level 2 Products
2.4.4.3 Appendix A: Mapping of temperature error on to the retrieved VMR profiles
2.4.4.4 Appendix B: Algorithm for generation of the optimized microwindow databases
2.4.4.5 Appendix C: Handling of initial guess profiles
2.5 Instrument specific topics
2.6 Auxiliary products
2.6.1 Level 1b
2.6.2 Level 2
2.7 Latency, throughput and data volume
2.8 Characterisation and calibration
2.8.1 Characterisation
2.8.2 Calibration
2.8.2.1 Level 1B
2.8.2.1.1 Radiometric offset calibration
2.8.2.1.2 Radiometric gain calibration
2.8.2.1.3 Line of sight
2.8.2.1.4 Spectral calibration
2.8.2.1.5 Instrument line shape
2.8.2.1.6 Radiometric calibration
2.9 Data handling cookbook
3 The MIPAS Instrument
3.1 Instrument description
3.1.1 Overview
3.1.2 Payload description and position on the platform
3.1.3 Subsystem description
3.1.3.1 MIPAS Optics (MIO) module
3.1.3.1.1 Front End Optics (FEO) subsystem
3.1.3.1.1.1 Azimuth Scan Unit (ASU)
3.1.3.1.1.2 Elevation Scan Unit (ESU)
3.1.3.1.1.3 Calibration Blackbody Assembly (CBA)
3.1.3.1.1.4 Receiving Telescope (TEL)
3.1.3.1.2 Interferometer (INT) subsystem
3.1.3.1.2.1 Interferometer optics (INO)
3.1.3.1.2.2 Interferometer mechanism assembly (IMA)
3.1.3.1.2.3 Optical-path difference sensor (ODS)
3.1.3.1.3 Focal Plane Subsystem (FPS)
3.1.3.1.3.1 Detector/preamplifier unit (DPU)
3.1.3.1.3.2 FPS Cooler Assembly (FCA)
3.1.3.2 MIPAS Electronics (MIE) module
3.1.3.2.1 Electronics Support Plate (ESP)
3.1.3.2.2 Instrument Control Electronics (ICE)
3.1.3.2.3 MIPAS Power Distribution Unit (MPD)
3.1.3.2.4 Signal Processor Electronics (SPE)
3.1.3.2.5 Detector Preamplifier (PAW)
3.1.3.2.6 Focal plane cooler drive electronics (FCE)
3.2 Instrument characteristics and performances
3.2.1 Preflight characteristics and expected performances
3.2.1.1 Spectral
3.2.1.2 Spatial
3.2.1.3 Radiometric
3.2.1.4 Pointing
3.2.1.5 Stability
3.2.1.6 Summary
3.3 Inflight performance verification
4 Frequently Asked Questions
5 Glossary
5.1 List of acronyms
5.2 Alphabetical index of technical terms
5.3 Glossaries of technical terms
5.3.1 Data Processing
5.3.2 Spectrometry and radiometry
5.3.3 Miscellaneous hardware and optical terms
5.3.4 Pointing
5.3.5 Level 2 processing
5.4 References
6 MIPAS Data Formats Products
6.1 Level 2 Products
6.1.1 MIP_NL__2P: MIPAS Temperature , Pressure and Atmospheric Constituents Profiles
6.1.2 MIP_NLE_2P: MIPAS Extracted Temperature , Pressure and Atmospheric Constituents Profiles
6.2 Level 1 Products
6.2.1 MIP_NL__1P: MIPAS Geolocated and Calibrated Spectra
6.3 Level 0 Products
6.3.1 MIP_LS__0P: MIPAS Line of Sight (LOS) Level 0
6.3.2 MIP_NL__0P: MIPAS Nominal Level 0
6.3.3 MIP_RW__0P: MIPAS Raw Data and SPE Self Test Mode
6.4 Auxilliary Products
6.4.1 MIP_CA1_AX: Instrument characterization data
6.4.2 MIP_CG1_AX: MIPAS Gain calibration
6.4.3 MIP_CL1_AX: Line of sight calibration
6.4.4 MIP_CO1_AX: MIPAS offset validation
6.4.5 MIP_CS1_AX: MIPAS ILS and Spectral calibration
6.4.6 MIP_CS2_AX: Cross Sections Lookup Table
6.4.7 MIP_FM2_AX: Forward Calculation Results
6.4.8 MIP_IG2_AX: Initial Guess Profile data
6.4.9 MIP_MW1_AX: Level 1B Microwindow dictionary
6.4.10 MIP_MW2_AX: Level 2 Microwindows data
6.4.11 MIP_OM2_AX: Microwindow Occupation Matrix
6.4.12 MIP_PI2_AX: A Priori Pointing Information
6.4.13 MIP_PS1_AX: Level 1B Processing Parameters
6.4.14 MIP_PS2_AX: Level 2 Processing Parameters
6.4.15 MIP_SP2_AX: Spectroscopic data
6.5 Records
6.5.1 Main Product Header
6.5.2 Level 0 MDSR
6.5.3 Level 0 SPH
6.5.4 1 MDSR per MDS
6.5.5 MDS1 -- 1 mdsr forward sweep 1 mdsr reverse sweep
6.5.6 MDS2 -- 1 mdsr forward sweep 1 mdsr reverse
6.5.7 LOS calibration GADS
6.5.8 2 MDSRs per MDS 1 forward sweep 1 reverse sweep
6.5.9 2 MDSR per MDS 1 forward sweep 1 reverse sweep
6.5.10 ILS Calibration GADS
6.5.11 P T retrieval microwindows ADS
6.5.12 GADS General
6.5.13 LUTs for p T retrieval microwindows MDS
6.5.14 Microwindow grouping data ADS
6.5.15 Data depending on occupation matrix location ADS
6.5.16 General data
6.5.17 Jacobian matrices MDS
6.5.18 Computed spectra MDS
6.5.19 Values of unknown parameters MDS
6.5.20 GADS General (same format as for MIP_IG2_AX)
6.5.21 P T continuum profiles MDS (same format as for MIP_IG2_AX)
6.5.22 Pressure profile MDS (same format as for MIP_IG2_AX)
6.5.23 Temperature profiles MDS (same format as for MIP_IG2_AX)
6.5.24 VMR profiles MDS (same format as for MIP_IG2_AX)
6.5.25 1 MDSR per MDS
6.5.26 P T retrieval microwindows ADS
6.5.27 VMR #1 retrieval microwindows ADS
6.5.28 DSD for MDS containing p T retrieval microwindows data
6.5.29 DSD#1 for MDS containing VMR retrieval microwindows data
6.5.30 Gain Calibration ADS #1
6.5.31 Gain Calibration ADS #2
6.5.32 Geolocation ADS (LADS)
6.5.33 Scan Information ADS
6.5.34 Offset Calibration ADS
6.5.35 Summary Quality ADS
6.5.36 Structure ADS
6.5.37 Calibrated Spectra MDS
6.5.38 Mipas Level 1B SPH
6.5.39 Scan Geolocation ADS
6.5.40 Scan Information MDS
6.5.41 Microwindows Occupation Matrices ADS
6.5.42 Instrument and Processing Parameters ADS
6.5.43 PCD Information of Individual Scans ADS
6.5.44 Residual Spectra mean values and standard deviation data ADS
6.5.45 Summary Quality ADS
6.5.46 Structure ADS
6.5.47 Continuum Contribution and Radiance Offset MDS
6.5.48 P T and Height Correction Profiles MDS
6.5.49 H2O Target Species MDS
6.5.50 Level 2 product SPH
6.5.51 Scan information MDS
6.5.52 Microwindows occupation matrices for p T and trace gas retrievals
6.5.53 Instrument and Processing Parameters ADS
6.5.54 Summary Quality ADS
6.5.55 MIP_NLE_2P SPH
6.5.56 P T occupation matrices ADS
6.5.57 Priority of p T retrieval occupation matices
6.5.58 General GADS
6.5.59 Occupation matrices for p T retrieval MDS
6.5.60 Occupation matrices for vmr#1 retrieval MDS
6.5.61 General GADS
6.5.62 Inverse LOS VCM matrices MDS
6.5.63 Processing Parameters GADS
6.5.64 Framework Parameters GADS
6.5.65 P t Retrieval GADS
6.5.66 VMR Retrieval Parameters GADS
6.5.67 P T Retrieval MW ADS
6.5.68 Spectral Lines MDS

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry

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