VLIDORT User's Guide

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Table A2: Type Structure VLIDORT_Fixed_BooleanNameKind/IntenDescriptiontDO_FULLRAD_MODE Logical (I) If set, VLIDORT will do a full radiance calculation.DO_SSCORR_TRUNCATION Logical (I) If set, VLIDORT performs additional delta-M scaling on thesingle scatter RTE, applicable to either the nadir-only or theoutgoing sphericity SS calculations.DO_SSEXTERNAL Logical (I) If set, VLIDORT will use single scatter results computedexternally in computations requiring single-scatter input.DO_SSFULL Logical (I) If set, VLIDORT operates in single scatter mode, with nodiffuse field. In this case, results are taken from SSCORRnadir or outgoing modules and, for the upwelling field, thedirect-bounce correction (BRDF/Lambertian) is added.Note: DO_SSFULL overrides DO_FULLRAD_MODE.DO_THERMAL_EMISSION Logical (I) If set, VLIDORT will compute atmospheric thermalemission with possible scattering.DO_SURFACE_EMISSION Logical (I) If set, VLIDORT will compute surface thermal emissionDO_PLANE_PARALLEL Logical (I) Flag for use of the plane-parallel approximation for the directbeam attenuation. If not set, the atmosphere will be pseudospherical.DO_UPWELLING Logical (I) If set, VLIDORT will compute upwelling output.DO_DNWELLING Logical (I) If set, VLIDORT will compute downwelling output.DO_QUAD_OUTPUT Logical (I) If set, VLIDORT will return radiances at quadrature streamangles.DO_LAMBERTIAN_SURFACE Logical (I) Flag for choosing Lambertian surface properties.DO_SURFACE_LEAVING Logical (I) Flag for choosing implementation of a surface leavingStokes vector contribution.DO_SL_ISOTROPIC Logical (I) Flag for choosing isotropic surface leaving contributions.Table A3: Type Structure VLIDORT_Fixed_ControlNameKind/IntenDescriptiontNSTOKES Integer (I) Number of Stokes vector parameters for which computationswill be done.NSTREAMS Integer (I) Number of quadrature streams in the cosine half space [0, 1].Must be ≤ symbolic dimension MAXSTREAMS.NLAYERS Integer (I) Number of layers in atmosphere (NLAYERS = 1 is allowed).Must be ≤ symbolic dimension MAXLAYERS.NFINELAYERS Integer (I) Number of fine layers subdividing coarse layering. Only forDO_SSCORR_OUTGOING, ≤ dimensionMAXFINELAYERS.N_THERMAL_COEFFS Integer (I) Number of coefficients used in treatment of blackbodyemission in a layer. N_THERMAL_COEFFS = 1 impliesconstant within a layer; N_THERMAL_COEFFS = 2implies a linear treatment. Maximum value allowed iscurrently 2.VLIDORT_ACCURACY Real*8 (I) Accuracy criterion for convergence of Fourier series inrelative azimuth. If for each output stream, addition of them th Fourier term changes the total (Fourier-summed)intensity by a relative amount less than this value, then wepass the convergence test. For each solar angle, convergenceis tested for intensities at all output stream angles, levels andazimuth angles. Once one solar beam result has converged,there is no further point in calculating any more Fourierterms for this beam,.84
Table A4: Type Structure VLIDORT_Fixed_SunraysName Kind/Intent DescriptionFLUX_FACTOR Real*8 (I) Beam source flux, the same value to be used for all solarangles. Normally set equal to 1 for “sun-normalized” output.Table A5: Type Structure VLIDORT_Fixed_UserValuesName Kind/Intent DescriptionN_USER_LEVELS Integer (I) Number of vertical output levels.Table A6: Type Structure VLIDORT_Fixed_ChapmanName Kind/Intent DescriptionHEIGHT_GRID Real*8 (I) Heights in [km] at layer boundaries, measured from TOA.Only required when Chapman function calculation ofDELTA_SLANT_INPUT is done internally. Must bemonotonically decreasing from TOA (this is checked).PRESSURE_GRID Real*8 (I) Pressure in [mb] from TOA to BOA. Only required forinternal Chapman factor calculation with refractive geometry.TEMPERATURE_GRID Real*8 (I) Temperature in [K] from TOA to BOA. Only required forinternal Chapman factor calculation with refractive geometry.FINEGRID Integer (I) Integer array indicating number of fine layer divisions to beused in Snell’s Law bending in the Chapman factorcalculation with refraction. Recommended to setFINEGRID(N)=10. Refraction only.RFINDEX_PARAMETER Real*8 (I) Only required for DO_REFRACTIVE_GEOMETRY option.Table A7: Type structure VLIDORT_Fixed_OpticalName Kind/Intent DescriptionDELTAU_VERT_INPUT (n) Real*8 (I) Vertical optical depth thickness values for all layers n.GREEKMAT_TOTAL_INPUT (L,n,S) Real*8 (I) For all layers n and Stokes vector components S,Legendre moments of the phase function expansionmultiplied by (2L+1); initial value (L=0) shouldalways be 1 (checked).THERMAL_BB_INPUT (n) Real*8 (I) Thermal input for all layers n.LAMBERTIAN_ALBEDO Real*8 (I) Lambertian albedo values (between 0 and 1).SURFACE_BB_INPUT Real*8 (I) Thermal input for surface.Table A8: Type structure VLIDORT_Fixed_WriteName Kind/Intent DescriptionDO_DEBUG_WRITEFlag for writing VLIDORT debug output.Logical (I)(RT Solution use only)DO_WRITE_INPUT Logical (I) Flag for sending certain VLIDORT general inputs tofile.INPUT_WRITE_FILENAME Character (I) File name for certain VLIDORT general inputs (up to60 characters).DO_WRITE_SCENARIO Logical (I) Flag for sending certain VLIDORT scenario inputs tofile.SCENARIO_WRITE_FILENAME Character (I) File name for certain VLIDORT scenario inputs (upto 60 characters).85
Page 1:
User’s GuideVLIDORTVersion 2.6Rob
Page 5 and 6:
Table of Contents1H1. Introduction
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1. Introduction to VLIDORT1.1. Hist
Page 9 and 10:
Table 1.1 Major features of LIDORT
Page 11 and 12:
In 2006, R. Spurr was invited to co
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corrections, and sphericity correct
Page 16 and 17:
Matrix Π relates scattering and in
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m⎛ P⎞l( μ)0 0 0⎜⎟mmm ⎜ 0
Page 20 and 21:
In the following sections, we suppr
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of the single scatter albedo ω and
Page 24 and 25:
Here T n−1 is the solar beam tran
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~ + ~ ~ (1)~ ~ + ~ ~ (2)~ ~ − ~ 1
Page 28 and 29:
The solution proceeds first by the
Page 30 and 31:
Linearizations. Derivatives of all
Page 32 and 33:
For the plane-parallel case, we hav
Page 34 and 35: One of the features of the above ou
Page 36 and 37: L↑↑ ↑k (cot n −cotn −1)[
Page 38 and 39: Note the use of the profile-column
Page 40 and 41: βl,aer(1)(2)fz1e1βl+ ( 1−f ) z2
Page 42 and 43: For BRDF input, it is necessary for
Page 44 and 45: streams were used in the half space
Page 46 and 47: anded tri-diagonal matrix A contain
Page 48 and 49: in place to aid with the LU-decompo
Page 50 and 51: In earlier versions of LIDORT and V
Page 53 and 54: 4. The VLIDORT 2.6 package4.1. Over
Page 55 and 56: (discrete ordinates), so that dimen
Page 57 and 58: Table 4.2 Summary of VLIDORT I/O Ty
Page 59 and 60: Table 4.3. Module files in VLIDORT
Page 61 and 62: Finally, modules vlidort_ls_correct
Page 63 and 64: end program main_VLIDORT4.3.2. Conf
Page 65 and 66: $(VLID_DEF_PATH)/vlidort_sup_brdf_d
Page 67 and 68: Finally, the command to build the d
Page 69 and 70: Here, “s” indicates you want to
Page 71 and 72: The main difference between “vlid
Page 73 and 74: to both VLIDORT and the given VSLEA
Page 75 and 76: STATUS_INPUTREAD is equal to 4 (VLI
Page 77 and 78: 5. ReferencesAnderson, E., Z. Bai,
Page 79 and 80: Mishchenko, M.I., and L.D. Travis,
Page 81: Stamnes K., S-C. Tsay, W. Wiscombe,
Page 86 and 87: DO_WRITE_FOURIER Logical (I) Flag f
Page 88 and 89: USER_LEVELS (o) Real*8 (IO) Array o
Page 90 and 91: angle s, Stokes parameter S, and di
Page 92 and 93: DO_SLEAVE_WFS Logical (IO) Flag for
Page 94 and 95: 6.1.1.8. VLIDORT linearized outputs
Page 96 and 97: NFINELAYERS Integer Number of fine
Page 98 and 99: 6.1.2.4. VLIDORT linearized modifie
Page 100 and 101: The output file contains (for all 3
Page 102 and 103: The first call is the baseline calc
Page 104 and 105: for a 2-parameter Gamma-function si
Page 106 and 107: Remark. In VLIDORT, the BRDF is a 4
Page 108 and 109: 6.3.3.1. Input and output type stru
Page 110 and 111: Table C: Type Structure VBRDF_LinSu
Page 112 and 113: Special note regarding Cox-Munk typ
Page 114 and 115: squared parameter, so that Jacobian
Page 116 and 117: 6.4. SLEAVE SupplementHere, the sur
Page 118 and 119: is possible to define Jacobians wit
Page 120 and 121: etween 0 and 90 degrees.N_USER_OBSG
Page 122: 6.4.4.2 SLEAVE configuration file c
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