Aerosol Properties (ARNP)
[DOI: 10.57746/EO.01gs73b391h9hbq171t9j4v6wq]

Introduction

ARNP Definition Optical thickness, Angstrom exponent, and classification of aerosol over land and ocean.
Unit none
ATBD Ver.1 (Jul. 2018)
Ver.2 (May. 2020)
Ver.3 (Nov. 2021)

Update contents of Ver.2

  • ・Added auxiliary data (Himawari aerosol assimilation model data)

Update contents of Ver.3

  • ・Merged land and ocean data
  • ・Merged non-polarization and porlarization methods
    Ver.1-2: AeRosol by Non-Polarozation
    Ver.3: AeRosol properties using Numerical Prediction
  • ・Added uncertities for each output dataset

Sample image

File format Ver.1 Ver.2 Ver.3
hdf5 To be uploaded
 ARNPK(1km)
ARNPF(1/24deg)
 ARNPK(1km)
ARNPF(1/24deg)
Image - AROT_land(1km)
ARAE_land(1km)
ASSA_land(1km)
 AROT(1km)
ARAE(1km)
ASSA(1km)

Dataset name

Ver.1,2 Ver.3

Ver.1,2 Description
ARAE_land Angstrom Exponent over Land at 500 nm and 380 nm
ARAE_ocean Angstrom Exponent over Ocean at 500 nm and 865 nm
AROT_land Aerosol Optical Thickness over Land at 500 nm
AROT_ocean Aerosol Optical Thickness over Ocean at 500 nm
ARSSA_land Single Scattering Albedo over Land at 380 nm
QA_flag
Ver.3 Description
AROT Aerosol Optical Thickness over land and ocean at 500 nm
ARAE Angstrom exponent over land and ocean at 500 nm and 380 nm
ASSA Single Scattering Albedo over land and ocean at 380 nm
AROT_uncertainty Uncertainty of Aerosol Optical Thickness
ARAE_uncertainty Uncertainty of Angstrom exponent
ASSA_uncertainty Uncertainty of Single Scattering Albedo

QA_flag information

Ver.1,2 Ver.3 Ver.1,2(Sample Image) Ver.3(Sample Image)

Bit ver.1,2 Description ARAE_land_L3_mask* ARAE_ocean_L3_mask* AROT_land_L3_mask* AROT_ocean_L3_mask* ARSSA_land_L3_mask*
0 Data Availability 0=Available, 1=Not Available 0 0 0 0 0
1 Land / Water Flag 0=Water, 1=Land 0 0 0 0 0
2 Coastal Flag 0=No, 1=Yes 0 0 0 0 0
3 Cloud Flag 0=Clear, 1=Cloudy 0 0 0 0 0
4 Aerosol Optical Thickness Confidence Flag 00=Very Good; 01=Good, 10=Marginal, 11=No Confidence or Fill 0 0 0 0 0
5 Aerosol Optical Thickness Confidence Flag 0 0 1 1 0
6 Angstrom Exponent Confidence Flag 00=Very Good; 01=Good, 10=Marginal, 11=No Confidence or Fill 0 0 0 0 0
7 Angstrom Exponent Confidence Flag 1 1 0 0 0
8 Aerosol Single Scattering Albedo Confidence Flag 00=Very Good; 01=Good, 10=Marginal, 11=No Confidence or Fill 0 0 0 0 0
9 Aerosol Single Scattering Albedo Confidence Flag 0 0 0 0 1
10 Sunglint Flag 0=No, 1=Yes 0 0 0 0 0
11 Stray-Light Flag 0=No, 1=Yes 0 0 0 0 0
12 Cloud Shadow Possibility Flag 0=No, 1=Yes 0 0 0 0 0
13 Uncertain Surface Reflectance Flag (Turbid Water, Snow/Ice Covered Surface or Rtoa_obs < Rtoa_Rayleigh) 0=No, 1=Yes 0 0 0 0 0
14 Spare 0 0 0 0 0
15 Spare 0 0 0 0 0

 * Bits masked by statistical processing are indicated by 1.

 Please refer to here to the detail information for QA flag.

Bit ver.3 Description ARAE_L3_mask* AROT_L3_mask* ASSA_L3_mask*
0 Data Availability 0=Available, 1=Not Available 0 0 0
1 Land / Water Flag 0=Water, 1=Land 0 0 0
2 Coastal Flag 0=No, 1=Yes 0 0 0
3 Cloud Flag 0=Clear, 1=Cloudy 0 0 0
4 Aerosol Optical Thickness Confidence Flag 00=Very Good; 01=Good, 10=Marginal, 11=No Confidence or Fill 0 0 0
5 Aerosol Optical Thickness Confidence Flag 0 1 0
6 Angstrom Exponent Confidence Flag 00=Very Good; 01=Good, 10=Marginal, 11=No Confidence or Fill 0 0 0
7 Angstrom Exponent Confidence Flag 1 0 0
8 Aerosol Single Scattering Albedo Confidence Flag 0=Very Good or Good, 1=Marginal or No Confidence or Fill 0 0 1
9 Heavy aerosol 0=No, 1=Yes 0 0 0
10 Sunglint Flag 0=No, 1=Yes 0 0 0
11 Stray-Light Flag 0=No, 1=Yes 0 0 0
12 Cloud Shadow Possibility Flag 0=No, 1=Yes 0 0 0
13 Uncertain Surface Reflectance Flag (Turbid Water, Snow/Ice Covered Surface or Rtoa_obs < Rtoa_Rayleigh) 0=No, 1=Yes 1 1 1
14 Use Polarization 0=No, 1=Yes 0 0 0
15 A prior of retrieval 0=MODEL, 1=CONSTANT 0 0 0

 * Bits masked by statistical processing are indicated by 1.

 Please refer to here to the detail information for QA flag.

Attribute information

Ver.1 Ver.2 Ver.3

Ver.1 Attribute Remarks
Attribute of Image_data
Attribute of Image_data Grid_interval 0.00833333 1km: 0.00833333
Grid_interval_unit deg
Image_projection EQA (sinusoidal equal area) projection from 0-deg longitude
Lower_left_latitude 40 Variable
Lower_left_longitude 130.541
Lower_right_latitude 40
Lower_right_longitude 143.595
Number_of_lines 1200 1km: 1200
Number_of_pixels 1200
Upper_left_latitude 50 Variable
Upper_left_longitude 155.572
Upper_right_latitude 50
Upper_right_longitude 171.13
ARAE_land
ARAE_land
16-bit unsigned integer		 Data_description Angstrom Exponent over Land at 500 nm and 380 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 2500
Minimum_valid_DN 0
Offset -0.5
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.001
Unit Dimensionless
Mask_for_statistics 128 詳細: QA_flag情報(～L3_mask)
ARAE_ocean
ARAE_ocean
16-bit unsigned integer		 Data_description Angstrom Exponent over Ocean at 500 nm and 865 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 2500
Minimum_valid_DN 0
Offset -0.5
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.001
Unit Dimensionless
Mask_for_statistics 128 詳細: QA_flag情報(～L3_mask)
AROT_land
AROT_land
16-bit unsigned integer		 Data_description Aerosol Optical Thickness over Land at 500 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 5000
Minimum_valid_DN 0
Offset 0
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.001
Unit Dimensionless
Mask_for_statistics 32 詳細: QA_flag情報(～L3_mask)
AROT_ocean
AROT_ocean
16-bit unsigned integer		 Data_description Aerosol Optical Thickness over Ocean at 500 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 5000
Minimum_valid_DN 0
Offset 0
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.001
Unit Dimensionless
Mask_for_statistics 32 詳細: QA_flag情報(～L3_mask)
ARSSA_land
ARSSA_land
16-bit unsigned integer		 Data_description Single Scattering Albedo over Land at 380 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 1000
Minimum_valid_DN 0
Offset 0
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.001
Unit Dimensionless
Mask_for_statistics 512 詳細: QA_flag情報(～L3_mask)
QA_flag
QA_flag
16-bit unsigned integer		 Data_description (Please refer to the QA_flag information)
Error_DN 0
Maximum_valid_DN 65535
Minimum_valid_DN 0
Offset 0
Slope 1
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Unit = Dimensionless Dimensionless
Ver.2 Attribute Remarks
Attribute of Image_data
Attribute of Image_data Grid_interval 0.00833333 1km: 0.00833333
Grid_interval_unit deg
Image_projection EQA (sinusoidal equal area) projection from 0-deg longitude
Lower_left_latitude 40 Variable
Lower_left_longitude 130.541
Lower_right_latitude 40
Lower_right_longitude 143.595
Number_of_lines 1200
Number_of_pixels 1200
Upper_left_latitude 50
Upper_left_longitude 155.572
Upper_right_latitude 50
Upper_right_longitude 171.13
ARAE_land
ARAE_land
16-bit unsigned integer		 Data_description Angstrom Exponent over Land at 500 nm and 380 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 2500
Minimum_valid_DN 0
Offset -0.5
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.001
Unit Dimensionless
Mask_for_statistics 128 Detail: QA_flag information (~L3_mask)
ARAE_ocean
ARAE_ocean
16-bit unsigned integer		 Data_description Angstrom Exponent over Ocean at 500 nm and 865 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 2500
Minimum_valid_DN 0
Offset -0.5
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.001
Unit Dimensionless
Mask_for_statistics 128 Detail: QA_flag information (~L3_mask)
AROT_land
AROT_land
16-bit unsigned integer		 Data_description Aerosol Optical Thickness over Land at 500 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 5000
Minimum_valid_DN 0
Offset 0
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.001
Unit Dimensionless
Mask_for_statistics 32 Detail: QA_flag information (~L3_mask)
AROT_ocean
AROT_ocean
16-bit unsigned integer		 Data_description Aerosol Optical Thickness over Ocean at 500 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 5000
Minimum_valid_DN 0
Offset 0
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.001
Unit Dimensionless
Mask_for_statistics 32 Detail: QA_flag information (~L3_mask)
ARSSA_land
ARSSA_land
16-bit unsigned integer		 Data_description Single Scattering Albedo over Land at 380 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 1000
Minimum_valid_DN 0
Offset 0
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.001
Unit Dimensionless
Mask_for_statistics 512 Detail: QA_flag information (~L3_mask)
QA_flag
QA_flag
16-bit unsigned integer		 A_priori_of_retrieval Constant
Data_description (Please refer to the QA_flag information)
Error_DN 0
Maximum_valid_DN 65535
Minimum_valid_DN 0
Offset 0
Slope 1
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Unit = Dimensionless Dimensionless
Ver.3 Attribute Remarks
Attribute of Image_data
Attribute of Image_data Grid_interval 0.00833333 1km: 0.00833333
Grid_interval_unit deg
Image_projection EQA (sinusoidal equal area) projection from 0-deg longitude
Lower_left_latitude 40 Variable
Lower_left_longitude 130.541
Lower_right_latitude 40
Lower_right_longitude 143.595
Number_of_lines 1200
Number_of_pixels 1200
Upper_left_latitude 50
Upper_left_longitude 155.572
Upper_right_latitude 50
Upper_right_longitude 171.13
ARAE
ARAE
16-bit unsigned integer		 Data_description Angstrom Exponent at 500 nm and 380 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 50000
Minimum_valid_DN 0
Offset -0.5
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.00005
Unit Dimensionless
Mask_for_statistics 8320 Detail: QA_flag information (~L3_mask)
ARAE_uncertainty
ARAE_uncertainty
16-bit unsigned integer		 Data_description Uncertainty of Angstrom Exponent | VAL=DN*Slope+Offset (DN=254 if VAL>=254*slope+offset)
Error_DN 255
Maximum_valid_DN 254
Minimum_valid_DN 0
Offset 0
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.01
Unit Dimensionless
AROT
AROT
16-bit unsigned integer		 Data_description Aerosol Optical Thickness at 500 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 50000
Minimum_valid_DN 0
Offset 0
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.0001
Unit Dimensionless
Mask_for_statistics 8224 Detail: QA_flag information (~L3_mask)
AROT_uncertainty
AROT_uncertainty
16-bit unsigned integer		 Data_description Uncertainty of Aerosol Optical Thickness | VAL=DN*Slope+Offset (DN=254 if VAL>=254*slope+offset)
Error_DN 255
Maximum_valid_DN 254
Minimum_valid_DN 0
Offset 0
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.02
Unit Dimensionless
ASSA
ASSA
16-bit unsigned integer		 Data_description Single Scattering Albedo at 380 nm | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 50000
Minimum_valid_DN 0
Offset 0
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.00002
Unit Dimensionless
Mask_for_statistics 8448 Detail: QA_flag information (~L3_mask)
ASSA_uncertainty
ASSA_uncertainty
16-bit unsigned integer		 Data_description Uncertainty of Single Scattering Albedo | VAL=DN*Slope+Offset (DN=254 if VAL>=254*slope+offset)
Error_DN 255
Maximum_valid_DN 254
Minimum_valid_DN 0
Offset 0
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.001
Unit Dimensionless
QA_flag
QA_flag
16-bit unsigned integer		 A_priori_of_retrieval Constant
Data_description (Please refer to the QA_flag information)
Error_DN 0
Maximum_valid_DN 65535
Minimum_valid_DN 0
Offset 0
Slope 1
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Unit = Dimensionless Dimensionless

How to use

  • ・Physical quantity＝DN*slope + offset
  • ・Valid values are during Minimum_valid_DN～Maximum_valid_DN