NOAA KLM User's Guide

Section 9.4.1

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9.4.1 ATOVS Sounding Product (April 27, 1999 - present)

The ATOVS archive (NOAA KLM series) is substantially different from the TOVS archive (TIROS-N, NOAA-6 through NOAA-14 series). Users that need a description of the format used for the TOVS Sounding Product between January 1979 and March 8, 1992, should refer to Section 5.1 of the NOAA Polar Orbiter Data User's Guide. ATOVS retrievals are made at 40 km spacing at nadir and up to 80 km at the limb. The ATOVS archive is actually four separate archive products. The first is the retrieval archive which is the full resolution archive of the ATOVS products, processed orbitally. The second archive is the metadata archive which consists of weekly statistics comparing the ATOVS retrievals to radiosonde data. The third archive is the Radiosonde Match Archive which contains radiosonde and retrieval data collocated in time and space. The final ATOVS archive product is the coefficient data base (CDB). The CDB contains the primary coefficients used in the generation of the ATOVS retrievals. Some coefficients are constants, others are satellite dependent and another set is updated on a weekly basis. The CDB is a very complex file and is not described in this section. Documentation about the CDB will be provided with any CDB product requested.

9.4.1.1 ATOVS Sounding Retrieval Archive Data File

The ATOVS retrieval archive data file contains complete sounding data, retrieval products and data quality flags. The Retrieval Archive Data File is in all integer format with data values scaled by values such as 64 or 128. The file contains records of length 1,000 bytes with a block size of 9,000 bytes. The first record in each file is the header record which is the same size as the data records and is described in Table 9.4.1.1-1 . Records 2 through N (the number of records) contain the retrieval records, in that the data frame record N+1 contains the data frame header for the next data frame. A typical orbit has 28 data frames. The format of each ATOVS retrieval data record is described in Table 9.4.1.1-2 . The archive product has been filtered for superadiabatic retrievals, hence even though there is a superadiabatic flag it will always return no superadiabatic data. Precipitation contaminated data is included in the archive, however it is not advisable to use this data with the same weight as the rest of the product for temperature or moisture retrieval analysis. The ATOVS archive contains parameters that were not archived in TOVS or RTOVS. These are cloud information (cloud top pressure and temperature, cloud amount) and radiation budget information (outgoing longwave radiation, layer cooling rates), and the sulfur dioxide content. These terms should be used with caution, even though they are archived as part of the ATOVS product, they are very new products and not fully proven for accuracy. The fill value for this file is -32768, missing is typically all I*2 bits set.

Table 9.4.1.1-1. Format of header record for ATOVS retrieval data file.
Starting Byte I*4 Location Length # of values Description
1 1 4 1 Number of data records in the file
5 2 4 1 First data record written in file (usually 2)
9 3 4 1 Last data record written
13 4 4 1 Logical record length
17 5 4 1 Spacecraft ID
21 n/a 3 1 File type (RET)
25 n/a 8 1 Satellite name ( e.g. NOAA 15)
34 n/a 44 1 File name
79 n/a 10 1 File creation data (YYYYMMDDHH)
89 23 4 1 Beginning orbit number
93 24 4 1 Ending orbit number
97 25 4 1 Time of first retrieval (YYYYMM)
101 26 4 1 Time of first retrieval (DDHH)
105 27 4 1 Time of first retrieval (mmss)
109 28 4 1 Time of last retrieval (YYYYMM)
113 29 4 1 Time of last retrieval (DDHH)
117 30 4 1 Time of last retrieval (mmss)
121 31-67 4 37 Spares

Table 9.4.1.1-2. Format of ATOVS Retrieval Data Record.
Byte # Integer Index # of Values Length Scale Description
1 1 1 2 n/a Record type (2=data record)
3 2 1 2 n/a Satellite number (XX from "NOAA-XX")
5 3 1 2 n/a Data frame number from beginning of Level 1b data
7 4 1 2 n/a Beginning orbit number
9 5 1 2 n/a Ending orbit number
11 6 5 2 n/a Spare
21 11 1 2 n/a Surface elevation (m)
23 12 7 2 n/a Spare
37 19 1 2 n/a 4-digit retrieval year
39 20 2 2 n/a Valid forecast date/time (YYMM, DDHH)
43 22 1 2 n/a Spare
45 23 1 2 n/a Retrieval grid point number (counter over the retrieval grid of 28 spots by 20 lines)
47 24 1 2 128 Retrieval latitude (-90 to +90 degrees)
49 25 1 2 128 Retrieval longitude (-180 to +180 degrees)
51 26 3 2 n/a Retrieval time (YYMM, DDHH, mmss)
57 29 1 2 n/a Precipitation flag:
0=no precipitation;
1=precipitation
59 30 1 2 n/a Terrain flag:
0=sea;
1=land;
2=coast;
10=sea ice;
11=snow
61 31 1 2 n/a Day/Night flag:
0=night;
1=day.
63 32 1 2 n/a Test or production version number
65 33 1 2 n/a Processing flag:
0=unsuccessful;
1=successfully processed
67 34 1 2 128 Solar zenith angle (degrees)
69 35 1 2 128 Satellite (local) zenith angle (degrees)
71 36 1 2 n/a Geographical index (bin number 1-23). (See Table 9.4.1.1-3.)
73 37 1 2 128 Solar azimuth angle (degrees)
75 38 1 2 n/a HIRS spot number (1-56)
77 39 1 2 n/a Orbital node:
1=ascending;
2=descending
79 40 1 2 n/a Superadiabatic flag:
0=not superadiabatic;
1=superadiabatic between 700 mb and 1000 mb;
2=superadiabatic between 500 mb and 700 mb;
3=superadiabatic between 100 mb and 500 mb;
4=superadiabatic above 100 mb
81 41 1 2 n/a Observation quality flag:
0=good;
2=failed gross temperature limits for HIRS and AMSU-A or is polar redundant or is superadiabatic, do not use for distribution, tuning or evaluation)
83 42 1 2 n/a Retrieval flag:
0=clear;
32=cloudy;
48=no-HIRS (one or more HIRS channel is missing or out of bounds)
85 43 1 2 n/a Spare
87 44 1 2 n/a Spare
89 45 42 2 64 Retrieved temperature profile (K). (See note 1.)
173 87 40 2 64 Adjusted brightness temperatures
(limb-corrected and cloud-detection performed) (K). (See note 2.)
253 127 35 2 64 Bias corrected, limb-corrected, cloud-detection performed brightness temperatures (K). (See note 2.)
323 162 35 2 64 Non-limb corrected, cloud-detection performed brightness temps (K). (See note 2.)
393 197 42 2 n/a Geopotential heights (m). (See note 1.)
477 239 19 2 1024 Water vapor mixing ratios, ln (g/kg). (See note 3.)
515 258 1 2 64 Tropopause temperature (K)
517 259 1 2 n/a Tropopause pressure (mb)
519 260 1 2 128 Total precipitable water (mm)
521 261 15 2 128 Layer precipitable water (mm). (See note 4.)
551 276 15 2 64 Layer mean virtual temperature (K). (See note 4.)
581 291 20 2 n/a Layer thicknesses (m). (See note 5.)
621 311 1 2 n/a Spare
623 312 1 2 n/a Spare
625 313 1 2 n/a Spare
627 314 9 2 n/a Spare
645 323 1 2 64 Sea surface temperature from internal map (K) (set to missing when SST map has land but terrain map has sea).
647 324 1 2 64 Derived skin temperature value (K)
649 325 1 2 Surface model level (ATOVS pressure level which is the closest retrieval pressure level to the surface pressure. Always level 40 over sea.)
651 326 1 2 64 Retrieved surface temperature (Bt) (K)
653 327 1 2 64 Water Vapor corrected HIRS channel 8 (Bt) (K)
655 328 1 2 64 Surface temperature estimate for HIRS channel 8 (K)
657 329 1 2 64 Surface temperature estimate for HIRS channel 18 (K)
659 330 1 2 64 Surface temperature estimate for HIRS channel 19 (K)
661 331 42 2 64 First Guess temperature profile (K). (See note 1.)
743 373 19 2 1024 First Guess water vapor mixing ratio, ln (g/kg). (See note 3.)
783 392 35 2 64 First Guess radiance temperatures (K). (See note 2.)
853 427 1 2 64 NCEP forecast potential temperature (K)
855 428 1 2 256 NCEP forecast relative humidity (%)
857 429 1 2 64 NCEP forecast surface temperature (K)
859 430 1 2 10 Adjusted NCEP forecast surface pressure (mb)
861 431 1 2 10 Forecast pressure (mb)
863 432 1 2 100 Potential temperature time minus NCEP forecast time
865 433 1 2 512 Stability departure
867 434 1 2 512 Lower departure
869 435 1 2 512 Upper departure
871 436 1 2 n/a Time difference (satellite minus forecast)
873 437 1 2 n/a Stability forecast increment
875 438 1 2 n/a Cloud liquid water (mm)
877 439 1 2 64 Cloud top temperature (K):
0=clear;
-777=missing.
879 440 1 2 n/a Cloud top pressure (mb):
1250=clear;
-777=missing.
881 441 1 2 100 Cloud amount:
0=clear;
-777=missing.
883 442 1 2 n/a Total ozone (dobson units)
885 443 1 2 128 Total precipitable water from 300 mb to 500 mb (mm)
887 444 1 2 128 Total precipitable water from 500 mb to 700 mb (mm)
889 445 1 2 128 Total precipitable water from 700 mb to 1000 mb (mm)
891 446 1 2 n/a Sulfur Dioxide (ppm or ppb)
893 447 1 2 n/a Polar redundancy flag:
-1=not redundant;
1=redundant.
895 448 1 2 10 Outgoing longwave radiation (W/m2)
897 449 1 2 1000 Layer cooling rate (240 mb to 10 mb) (W/m2)
899 450 1 2 1000 Layer cooling rate (500 mb to 240 mb) (W/m2)
901 451 1 2 1000 Layer cooling rate (700 mb to 500 mb) (W/m2)
903 452 1 2 1000 Layer cooling rate (1000 to 700 mb) (W/m2)
905 453 1 2 n/a Cloud comparison flag (cloud detection vs cloud products):
0 (good) =clear retrieval + clear cloud algorithm
0 (good) = cloudy retrieval+cloudy cloud algorithm
1 (bad) = clear retrieval +cloudy cloud algorithm
2 (so-so)= cloudy retrieval + clear cloud algorithm
907 454 1 2 n/a Library search closeness (pho) value
909 455 1 2 n/a Superadiabatic level (1-42) (level where profile became superadiabatic - set to missing if no superadiabatic levels are found)
911 456 1 2 n/a HIRS/AMSU-A gross temperature flag: 0=all temperatures within limits; 1=temperatures out of bounds.
913 457 44 2 n/a Spare
Notes:

1. ATOVS Temperature Levels 1-40 in millibars (0.1, 0.2, 0.5, 1.0, 1.5, 2, 3, 4, 5, 7, 10, 15, 20, 25, 30, 50, 60, 70, 85, 100, 115, 135, 150, 200, 250, 300, 350, 400, 430, 475, 500, 570, 620, 670, 700, 780, 850, 920, 950, 1000, 1012, 1030). Geopotential heights are represented in meters from 115 to 1030 mb and in decimeters from 0.1 through 100 mb. Currently the parameters for the 1012 and 1030 mb levels are not computed, but are planned for the future.

2. Channel ordering - HIRS channels 1-20 are stored first, then AMSU-A 1-15.

3. ATOVS Water Vapor Levels 1-19 in millibars (200, 250, 300, 350, 400, 430, 475, 500, 570, 620, 670, 700, 780, 850, 920, 950, 1000, 1012, 1030). Currently, the parameters for the 1012 and 1030 mb levels are not computed, but are planned for the future.

4. ATOVS Layer temperature and moisture values 1-15 in millibars (7-10, 10-20, 20-30, 30-50, 50-70, 70-100, 100-150, 150-200, 200-250, 250-300, 300-400, 400-500, 500-700, 700-850, 850-1000). Although the moisture array goes to 7mb, moisture is computed to 200mb, early ATOVS data goes to 300mb.

5. Layer thicknesses 1-20 in millibars ( 100-115, 115-135, 135-150, 150-200, 200-250, 250-300, 300-350, 350-400, 400-470, 470-500, 500-570, 570-620, 620-700, 700- 780, 780-850, 850-920, 920-950, 950-1000, 1000-1012, 1012-1030). The thickness below 1000mb is not currently computed but is planned for the future.

Table 9.4.1.1-3. Geographical Bins for ATOVS.
Class Number Latitude Zone Terrain Day/Night
1 90N to 60N Sea Day/Night
2 60N to 45N Sea Day/Night
3 45N to 30N Sea Day/Night
4 30N to 15N Sea Day/Night
5 15N to 15S Land/Sea Day/Night
6 15S to 30S Sea Day/Night
7 30S to 45S Sea Day/Night
8 45S to 60S Land/Sea Day/Night
9 60S to 90S Sea Day/Night
10 90N to 60N Land Day
11 60N to 45N Land Day
12 45N to 30N Land Day
13 30N to15N Land Day
14 15S to 30S Land Day
15 30S to 45S Land Day
16 60S to 90S Land Day
17 90N to 60N Land Night
18 60N to 45N Land Night
19 45N to 30N Land Night
20 30N to 15N Land Night
21 15S to 30S Land Night
22 30S to 45S Land Night
23 60S to 90S Land Night

9.4.1.2 ATOVS Sounding Quality Information (Metadata Archive) File

This section describes the format for the ATOVS quality information file. Each week, one record of data is written to this file. The data records contain 3380 Integer*2 words.Each record contains data for six latitude zones: 90N to 60N, 60N to 30N, 30N to 0, 0 to 30S, 30S to 60S, and 60S to 90S. The file is a rotating file, the first record (header record) is updated each week and contains the start date (year, month, and date of the next week's data, the next available record and the maximum records on the file). There are four data files for each week of Metadata Statistics: 1) Level Temperature statistics; 2) Layer Temperature statistics; 3) Mixing Ratio statistics; and 4) Brightness Temperature statistics. Table 9.4.1.2-1 contains the format for the header record which is the first record in the metadata archive file. Tables 9.4.1.2-2, 9.4.1.2-3, 9.4.1.2-4 and 9.4.1.2-5 contain the formats of the data records.

Table 9.4.1.2-1. Format of Metadata Archive Header Record.
Start Byte Data Type # of Values Length (bytes) Scale Description
1 Char 1 2 n/a Spare
3 Char 1 4 I*4 Next beginning year
7 Char 1 2 I*2 Next beginning month
9 Char 1 2 I*2 Next beginning day
11 Char 1 6 I*6 Spare
17 Char 1 2 I*2 Next record on file to write to
19 Char 1 6 I*6 Spare
25 Char 1 2 I*2 Maximum record on file to write to
27 Char n/a 3853 n/a Spares

Table 9.4.1.2-2. Format of Data Record 1 of Metadata archive file.
Data Record 1 - ATOVS Level temperature (40,4,6)
40 - levels
4 - statistics (1-mean, 2-root mean square, 3-standard deviation, and 4-sample size)
6 - zones
Start Byte # of Values Length (bytes) Scale Description
1 1 8 I*8 File record number
11 1 4 I*4 Beginning year of data
15 1 2 I*2 Beginning month of data
17 1 2 I*2 Beginning day of data (total of 7 days of data)
19 1 22 A*22 Information Character (i.e. ATOVS LEVEL TEMP STATS)
41 960 3840 (1..40,1..4,1..6) Level temperatures statistics
41 240 960 (1..40,1,1..6) Level temps Mean Difference from RAOB
1001 240 960 (1..40,2,1..6) Root Mean Square
1961 240 960 (1..40,3,1..6) Standard Deviation
2921 240 959 (1..40,4,1..6) Sample Size
Table 9.4.1.2-3. Format of Data Record 2 of Metadata archive file.
Data Record 2 - Layer Thickness temperatures (20,4,6)
20 - layers
4 - statistics (1-mean, 2-root mean square, 3-standard deviation, and 4-sample size)
6 - zones
Start Byte # of Values Length (bytes) Scale Description
1 1 8 I*8 File record number
11 1 4 I*4 Beginning year of data
15 1 2 I*2 Beginning month of data
17 1 2 I*2 Beginning day of data (total of 7 days of data)
19 1 22 A*22 Information Character (i.e. LAYER THICK STATS)
41 480 1920 (1..20,1..4,1..6) Layer Thickness Statistics
41 120 480 (1..20,1,1..6) Layer Thickness Mean
521 120 480 (1..20,2,1..6) Root Mean Square
1001 120 480 (1..20,3,1..6) Standard Deviation
1481 120 480 (1..20,4,1..6) Sample Size
1961 n/a 1919 n/a Spares

Table 9.4.1.2-4. Format of Data Record 3 of Metadata archive file.
Data Record 3 - Level Mixing Ratios (19,4,6)
19 - channels
4 - statistics (1-mean, 2-root mean square, 3-standard deviation, and 4-sample size)
6 - zones
Start Byte # of Values Length (bytes) Scale Description
1 1 8 I*8 File record number
11 1 4 I*4 Beginning year of data
15 1 2 I*2 Beginning month of data
17 1 2 I*2 Beginning day of data (total of 7 days of data)
19 1 22 A*22 Information Character (i.e. LEVEL MIXING RATIOS)
41 456 1824 (1..19,1..4,1..6) Level Mixing Ratios statistics
41 114 456 (1..19,1,1..6) Level Mixing Ratios
497 114 456 (1..19,2,1..6) Root Mean Square
953 114 456 (1..19,3,1..6) Standard Deviation
1409 114 456 (1..19,4,1..6) Sample Size
1865 n/a 2015 n/a Spares

Table 9.4.1.2-5. Format of Data Record 4 of Metadata archive file.
Data Record 4 - Brightness temperatures RAOB - Derived (35,4,6)
35 - 20 HIRS & 15 AMSU-A channels
4 - statistics (1-mean, 2-root mean square, 3-standard deviation, and 4-sample size)
6 - zones
Start Byte # of Values Length (bytes) Scale Description
1 1 8 I*8 File record number
11 1 4 I*4 Beginning year of data
15 1 2 I*2 Beginning month of data
17 1 2 I*2 Beginning day of data (total of 7 days of data)
19 1 22 A*22 Information Character (i.e. BRI TEMP DER STATS)
41 840 3360 (1..35,1..4,1..6) Layer Thickness Statistics
41 210 840 (1..35,1,1..6) Layer Thickness Mean
881 210 840 (1..35,2,1..6) Root Mean Square
1721 210 840 (1..35,3,1..6) Standard Deviation
2661 210 840 (1..35,4,1..6) Sample Size
3601 n/a 279 n/a Spares

9.4.1.3 ATOVS Radiosonde Matchup Archive File

The ATOVS data matched to radiosondes will be added to the suite of archived sounding products. The matchups of retrieval and radiosonde have gone through an extensive screening process. Thus, both profiles in the file are considered as 'good' and used as input to the retrieval process. The records in this file are 3,000 bytes in length. Table 9.4.1.3-1 contains the format of the header record for the radiosonde matchup file. Each bin or class also has a header record which is described in Table 9.4.1.3-2. The radiosonde standard levels (in millibars) are : 5, 7, 10, 20, 30, 50, 70, 100, 150, 200, 250, 300, 400, 500, 700, 850 and 1000.

Table 9.4.1.3-1. Format of header record for radiosonde matchup file.
Byte Integer Index Data Type # of Values Length Scale Description
1 1 Int 1 4 n/a Date of last file update (YYYYMMDD)
5 2 Int 1 4 n/a Number of records in the file
9 3 Int 1 4 n/a Last record containing valid data
13 4 Int 1 4 n/a Data of most recent data (YYYYMMDD)
17 5 Int 1 4 n/a File Type:
1=clear;
2=cloudy
21 6 Int 1 4 n/a Satellite ID (i.e., 15 for NOAA-15)
25 7 Int 3 4 n/a Spare
37 10 Int 1 4 n/a Number of classes in the file
41 11 Int 1 4 n/a First record for class 1
45 12 Int 1 4 n/a First record for class 2
49 13 Int 1 4 n/a First record for class 3
53 14 Int 1 4 n/a First record for class 4
57 15 Int 1 4 n/a First record for class 5
61 16 Int 1 4 n/a First record for class 6
65 17 Int 1 4 n/a First record for class 7
69 18 Int 1 4 n/a First record for class 8
73 19 Int 1 4 n/a First record for class 9
77 20 Int 1 4 n/a First record for class 10
81 21 Int 1 4 n/a First record for class 11
85 22 Int 1 4 n/a First record for class 12
89 23 Int 1 4 n/a First record for class 13
93 24 Int 1 4 n/a First record for class 14
97 25 Int 1 4 n/a First record for class 15
101 26 Int 1 4 n/a First record for class 16
105 27 Int 1 4 n/a First record for class 17
109 28 Int 1 4 n/a First record for class 18
113 29 Int 1 4 n/a First record for class 19
117 30 Int 1 4 n/a First record for class 20
121 31 Int 1 4 n/a First record for class 21
125 32 Int 1 4 n/a First record for class 22
129 33 Int 1 4 n/a First record for class 23
133 34 Int 716 4 n/a Spare

Table 9.4.1.3-2. Format of Class Header Record for Radiosonde Matchup File.
Byte Int Index Data Type # of Values Length (bytes) Scale Description
1 1 Int 1 2 n/a Record type (1=class header record)
3 2 Int 1 2 n/a Class number
5 3 Int 1 2 n/a Maximum number of matchups in this class
7 4 Int 1 2 n/a Actual number of matchups in this class
9 5 Int 1 2 n/a First data record within this class
11 6 Int 1 2 n/a Last data record within this class
13 7 Int 1493 2 n/a Spare

Table 9.4.1.3-3 contains the format of the data records in the radiosonde matchup file.

Table 9.4.1.3-3 contains the format of the data records in the radiosonde matchup file.
Start Byte Int Index # of Values Length Scale Description
Retrieved Data
1 1 1 2 n/a Record type (2=data record)
3 2 1 2 n/a Satellite number (XX from "NOAA-XX")
5 3 1 2 n/a Data frame number from beginning of Level 1b data
7 4 1 2 n/a Beginning orbit number
9 5 1 2 n/a Ending orbit number
11 6 5 2 n/a Spares
21 11 1 2 n/a Surface elevation (m)
23 12 7 2 n/a Spares
37 19 1 2 n/a 4-digit retrieval year
39 20 2 2 n/a Valid forecast date/time (YYMM, DDHH)
43 22 1 2 n/a Spare
45 23 1 2 n/a Retrieval grid point number (counter over the retrieval grid of 28 spots by 20 lines)
47 24 1 2 128 Retrieval latitude (-90 to +90 degrees)
49 25 1 2 128 Retrieval longitude (-180 to +180 degrees)
51 26 3 2 n/a Retrieval time (YYMM, DDHH, mmss)
57 29 1 2 n/a Precipitation flag:
0=no precip;
1=precip
59 30 1 2 n/a Terrain flag:
0=sea;
1=land;
2=coast;
10= sea ice;
11=snow.
61 31 1 2 n/a Day/Night flag:
0=night;
1=day.
63 32 1 2 n/a Test or production version number
65 33 1 2 n/a Processing flag:
0=unsuccessful;
1=successfully processed.
67 34 1 2 128 Solar zenith angle (degrees)
69 35 1 2 128 Satellite (local) zenith angle (degrees)
71 36 1 2 n/a Geographical index (bin number 1-23) See Table 9.4.3-2a.
73 37 1 2 128 Solar azimuth angle (degrees)
75 38 1 2 n/a HIRS spot number (1-56)
77 39 1 2 n/a Orbital node:
1=ascending;
2=descending.
79 40 1 2 n/a Superadiabatic flag:
0=not superadiabatic; 1=superadiabatic between 700mb and 1000mb;
2=superadiabatic between 500mb and 700mb;
3=superadiabatic between 100mb and 500mb;
4=superadiabatic above 100mb.
81 41 1 2 n/a Observation quality flag:
0=good;
2=failed gross temperature limits for HIRS and AMSU-A or is polar redundant or is superadidabatic.
83 42 1 2 n/a Retrieval flag:
0=clear;
32=cloudy;
48=no HIRS (one or more HIRS channels missing or out of bounds).
85 43 1 2 n/a Spare
87 44 1 2 n/a Spare
89 45 42 2 64 Retrieved temperature profile (K)
173 87 40 2 64 Adjusted brightness temperatures
(limb-corrected and cloud-detection performed) (K)
253 127 35 2 64 Bias corrected, Limb-corrected, cloud detection performed
brightness temperatures (K)
323 162 35 2 64 Non-limb corrected, cloud detection performed brightness temperatures (K)
393 197 42 2 n/a Geopotential heights (m)
477 239 19 2 1024 Water vapor mixing ratios, ln (g/kg)
515 258 1 2 64 Tropopause temperature (K)
517 259 1 2 n/a Tropopause pressure (mb)
519 260 1 2 128 Total precipitable water (mm)
521 261 15 2 128 Layer precipitable water (mm)
551 276 15 2 64 Layer mean virtual temperature (K)
581 291 20 2 n/a Layer thicknesses (m)
621 311 1 2 n/a Spare
623 312 1 2 n/a Spare
625 313 1 2 n/a Spare
627 314 9 2 n/a Spare
645 323 1 2 64 Sea surface temperature from internal map (K) (Set to missing when SST map has land but terrain map has sea.)
647 324 1 2 64 Derived skin temperature value (K)
649 325 1 2 n/a Surface model level (ATOVS level closest to surface elevation)
651 326 1 2 64 Retrieved surface temperature (Bt) (K)
653 327 1 2 64 Water Vapor corrected HIRS channel 8 (Bt) (K)
655 328 1 2 64 Surface temperature estimate for HIRS channel 8 (K)
657 329 1 2 64 Surface temperature estimate for HIRS channel 18 (K)
659 330 1 2 64 Surface temperature estimate for HIRS channel 19 (K)
661 331 42 2 64 First Guess temperature profile (K)
745 373 19 2 1024 First Guess water vapor mixing ratio, ln (g/kg)
783 392 35 2 64 First Guess radiance temperatures (K)
853 427 1 2 64 NCEP forecast potential temperature (K)
855 428 1 2 256 NCEP forecast relative humidity (%)
857 429 1 2 64 NCEP forecast surface temperature (K)
859 430 1 2 10 Adjusted NCEP forecast surface pressure (mb)
861 431 1 2 10 Forecast pressure (mb)
863 432 1 2 100 Potential temperature time minus NCEP forecast time
865 433 1 2 512 Stability departure
867 434 1 2 512 Lower departure
869 435 1 2 512 Upper departure
871 436 1 2 n/a Time difference (satellite minus forecast)
873 437 1 2 n/a Stability forecast increment
875 438 1 2 n/a Cloud liquid water (mm)
877 439 1 2 64 Cloud top temperature (K):
0=clear;
-777=missing.
879 440 1 2 n/a Cloud top pressure (mb):
1250=clear;
-777 = missing.
881 441 1 2 100 Cloud amount:
0=clear;
-777 = missing.
883 442 1 2 n/a Total ozone (dobson)
885 443 1 2 128 Total precipitable water from 300 to 500mb (mm)
887 444 1 2 128 Total precipitable water from 500 to 700mb (mm)
889 445 1 2 128 Total precipitable water from 700 to 1000mb (mm)
891 446 1 2 n/a Sulfur Dioxide (ppm or ppb)
893 447 1 2 n/a Polar redundancy flag:
-1=not redundant;
1=redundant.
895 448 1 2 10 Outgoing longwave radiation (W/m2)
897 449 1 2 1000 Layer cooling rate from 240mb to 10mb (W/m2)
899 450 1 2 1000 Layer cooling rate from 500mb to 240mb (W/m2)
901 451 1 2 1000 Layer cooling rate from 700mb to 500mb (W/m2)
903 452 1 2 1000 Layer cooling rate from 1000mb to 700mb (W/m2)
905 453 1 2 n/a Cloud comparison flag (cloud detection vs cloud products):
Clear retrieval + Clear cloud algorithm =0 (good);
Cloudy retrieval + cloudy cloud algorithm = 0 (good);
Clear retrieval + cloudy cloud algorithm = 1 (bad);
Cloudy retrieval + clear cloud algorithm = 2 (so-so).
907 454 1 2 n/a Library search closeness (pho) value
909 455 1 2 n/a Superadiabatic level (1-42)
911 456 1 2 n/a HIRS/AMSU-A gross temperature flag:
0= all temperatures within limits;
1 = one or more temperatures out of bounds.
913 457 44 2 n/a Spares
Matchup Information
1001 501 1 2 n/a Matchup test pass/fail flag:
0=pass;
1=fail.
1003 502 8 2 n/a Matchup test flags
1019 510 13 2 n/a Spares
1045 523 1 2 n/a Archive Flag:
1 = record has been written to archive (Matchup Database Holding and Archive files only).
1047 524 1 2 n/a Library flag:
0=not used in library;
1=used in library.
1049 525 1 2 n/a Difference in time (hours) between RAOB/Retrieval
1051 526 1 2 n/a Difference in distance (km) between RAOB/Retrieval
1053 527 1 2 64 Closeness parameter
1055 528 1 2 n/a Matchup Utility Index
Radiosonde Data
1057 529 1 2 n/a Radiosonde station ID (ASCII(1st char)*100 + (ASCII(2nd char))
1059 530 1 2 n/a Radiosonde station ID (ASCII(3rd char)*100 + (ASCII(4th char))
1061 531 1 2 n/a Radiosonde station ID (ASCII(5th char)*100 + (ASCII(6th char))
1063 532 3 2 n/a Radiosonde day of synoptic report (YY, MM, DD)
1069 535 3 2 n/a Radiosonde balloon release date (YY, MM, DD)
1075 538 1 2 100 Radiosonde observation time (hours in UTC)
1077 539 1 2 128 Radiosonde latitude (-90 to +90 degrees)
1079 540 1 2 128 Radiosonde longitude (-180 to +180 degrees)
1081 541 1 2 n/a Radiosonde station elevation (m)
1083 542 1 2 n/a Radiosonde instrument type
1085 543 1 2 n/a Radiosonde report type
1087 544 1 2 n/a Radiosonde terrain :
0=sea;
1 =land;
2=coast.
1089 545 1 2 64 Lowest reported pressure (mb)
1091 546 1 2 64 Highest reported pressure (mb)
Radiosonde test flags (0=pass, 1=fail)
1093 547 1 2 n/a Radiosonde pass/fail flag
1095 548 1 2 n/a Vertical extent flag
1097 549 1 2 n/a Data gap flag
1099 550 1 2 n/a Profile superadiabatic flag
1101 551 1 2 n/a Profile inversion flag
1103 552 1 2 n/a Spare
1105 553 1 2 n/a Profile climatological limits flag
1107 554 1 2 n/a Spare
Radiosonde quality flags (0=pass, 1=fail)
1109 555 1 2 n/a Standard level relative humidity not within limits flag
1111 556 1 2 n/a Standard level relative humidity missing flag
1113 557 1 2 n/a Standard level temperature not within limits flag
1115 558 1 2 n/a Tropopause temperature not within limits flag
1117 559 1 2 n/a Standard level temperature inaccurate flag
1119 560 1 2 n/a Tropopause temperature inaccurate flag
1121 561 1 2 n/a Data gaps in temperature data flag
1123 562 1 2 n/a Radiosonde vertical extent failure flag
1125 563 1 2 n/a Standard level relative humidity inaccurate flag
1127 564 1 2 n/a Significant level relative humidity missing flag
1129 565 1 2 n/a Significant level relative humidity vertical extent flag
1131 566 1 2 n/a Tropopause pressure limits flag
1133 567 1 2 n/a Superadiabatic layers flag
1135 568 1 2 n/a Temperature inversions flag
1137 569 1 2 n/a Tropopause data missing flag
1139 570 1 2 n/a Surface inversion flag
1141 571-
612
42 2 64 Radiosonde temperatures (C)
1225 613-
631
19 2 1024 Radiosonde water vapor mixing ratios (ln g/kg)
1263 632 1 2 n/a Radiosonde tropopause temperature (C)
1265 633 1 2 n/a Radiosonde tropopause pressure (mb)
1267 634 1 2 n/a Radiosonde surface pressure (mb)
1269 635 1 2 n/a Radiosonde surface temperature (C)
1271 636 1 2 1024 Radiosonde surface water vapor mixing ratio (ln g/kg)
1273 637 1 2 1024 Water vapor mixing ratio at lowest reported level (ln g/kg)
1275 638 1 2 1024 Water vapor mixing ratio at highest reported level (ln g/kg)
1277 639 3 2 100 Layer precipitable water from reported Radiosonde data (mm)
1283 642 1 2 100 Total precipitable water from reported Radiosonde data (mm)
1285 643 18 2 100 Layer precipitable water from extrapolated RAOB data (mm)
1321 661 16 2 n/a Spares
Category 1 Radiosonde Data (standard levels)
1353 677 17 2 n/a Standard level geopotential heights (m)
1387 694 17 2 10 Standard level temperatures (C)
1421 711 17 2 10 Standard level dewpoint depressions (C)
1455 728 17 2 n/a Standard level wind direction (degrees)
1489 745 17 2 n/a Standard level wind speed (knots)
1523 762 17 2 n/a Standard level geopotential height QC flags (ASCII)
1557 779 17 2 n/a Standard level temperature QC flags (ASCII)
1591 796 17 2 n/a Standard level dewpoint depression QC flags (ASCII)
1625 813 17 2 n/a Standard level wind QC flags (ASCII)
1659 830 17 2 n/a Standard level "missing" flags (ASCII)
Category 2 Radiosonde Data (significant levels)
1693 847 1 2 n/a Number of significant levels
1695 848 50 2 10 Significant level pressure (mb)
1795 898 50 2 10 Significant level temperature (C)
1895 948 50 2 10 Significant level dewpoint depression (C)
1995 998 50 2 n/a Significant level pressure QC flags (ASCII)
2095 1048 50 2 n/a Significant level temperature QC flags (ASCII)
2195 1098 50 2 n/a Significant level dewpoint depression QC flags (ASCII)
2295 1148 50 2 n/a Significant level spare QC flags (ASCII)
2395 1198 50 2 n/a Significant level "missing" flags (ASCII)
Category 3 Radiosonde Data (wind data)
2495 1248 1 2 n/a Number of wind levels
2497 1249 25 2 10 Wind level pressure (mb)
2547 1274 25 2 n/a Wind direction (degrees)
2597 1299 25 2 n/a Wind speed (knots)
2647 1324 25 2 n/a Wind level pressure QC flags (ASCII)
2697 1349 25 2 n/a Wind level wind QC flags (ACSII)
2747 1374 25 2 n/a Wind level spare QC flags (ASCII)
2797 1399 25 2 n/a Wind level spare QC flags (ASCII)
Category 5 Radiosonde Data (tropopause data)
2847 1424 2 2 10 Tropopause pressure (mb)
2851 1426 2 2 10 Tropopause temperature (C)
2855 1428 2 2 10 Tropopause dewpoint depression (C)
2859 1430 2 2 n/a Tropopause wind direction (degrees)
2863 1432 2 2 n/a Tropopause wind speed (knots)
2867 1434 2 2 n/a Tropopause level pressure QC flags (ASCII)
2871 1436 2 2 n/a Tropopause level temperature QC flags (ASCII)
2875 1438 2 2 n/a Tropopause level dewpoint depression QC flags (ASCII)
2879 1440 2 2 n/a Tropopause level wind QC flags (ASCII)
2883 1442 2 2 n/a Tropopause "missing" flags (ASCII)
Category 7 Radiosonde Data (cloud cover)
2887 1444 1 2 n/a Number of cloud levels (0 or 1)
2889 1445 1 2 10 Pressure at bottom of clouds (mb)
2891 1446 1 2 n/a Cloud cover percentage increments of 5, (less than 5% reported as 0)
2893 1447-1500 54 2 n/a Spares


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