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This appendix is linked to the Daily Arctic Ocean Rawinsonde Data from Soviet Drifting Ice Stations

Variables in Header of Each Sounding

STATION
North Pole station number. Missing values are -99. Occupies columns 1-3.

STN_IND
STATION NUMBER INDICATOR: Positive single digit. Specifies the type of station number given in the Condigital station variable.

0 = WBAN NUMBER
1 = AIR FORCE AUGMENTED WMO NUMBER
2 = SHIP CALL SIGN
3 = MOBILE PLATFORM CALL SIGN
4 = MOBILE PLATFORM ID (Assigned by NCDC)
5 = WMO/CARDS NUMBER
6 = FIXED PLATFORM CALL SIGN
7 = OTHER STATION NUMBER (Origin unknown)
8 = RESERVED
9 = NO STATION NUMBER

Missing values are 9. Occupies column 5.

ELEV
ELEVATION: The height of the launch site in meters used in Condigital soundings. Missing values are 9999.9. Occupies columns 7-13.

YEAR
Four-digit year of sounding observation. Missing values are 9999. Occupies columns 15-18.

MONTH
Two-digit month of sounding observation. Missing values are 99. Occupies columns 20-21.

DAY
Two-digit day of sounding observation. Missing values are 99. Occupies columns 23-24.

GMT_HOUR
Two-digit GMT hour of sounding observation. Usually 00, 06, 12, or 18. However, for those days that had more than four soundings, there will be soundings with additional hours. Missing values are -9. Occupies columns 26-27.

GMT_MINUTE
Two-digit GMT minute of sounding observation. Missing values are -9. Occupies columns 28-29.

STD_GMT_TIME
Two-digit standard GMT time from Aerostan data set. Missing values are -9. Occupies columns 31-32.

LOCAL_TIME
Three-digit local time used in Floppy soundings. Missing values are -9. Occupies columns 34-36.

RELSE_TIME
The hour and minute of the actual release, expressed as HHMM. Used in Condigital soundings. Missing values are 9999. Occupies columns 38-41

LATITUDE
The station latitude in degrees North. Missing values are 99.99. Occupies columns 43-47.

LONGITUDE
The station longitude in degrees East. Missing values are 999.99. Occupies columns 49-54.

MIN_ALTITUDE
Altitude in meters of first transmission level in sounding. Missing values are -9999999. Negative values generally indicate cases where the surface pressure is < 1000 mb and the first reported level is the mandatory 1000 mb level. Occupies columns 56-63.

MAX_ALTITUDE
Altitude in meters of last transmission level in sounding. Missing values are -9999999. Occupies columns 65-72.

OBSN_TYPE
Type of observation given in Condigital soundings:

01 = radio/rawinsonde
02 = rocketsonde
03 = satellite
04 = dropsonde
05 = aircraft flight level report
06 = Profiler
07 = PIBAL
08 = APOB
09 = RAWIN (RADAR winds only)
10 = Rawinsonde (RADAR winds)
11 = Radiosonde (optical theodolite)
12 = Rawinsonde (OMEGA NAVAID)
13-98 = reserved

Missing values are 99. Occupies columns 74-75.

QC_EFFORT
Used in Condigital soundings.
QUALITY CONTROL EFFORT: Intended for use in conjunction with the DATA_SRCE field for determining if the appendices of the Condigital documentation must be referenced for decoding the ELEMENT QUALITY flags. If QC EFFORT=0, the ELEMENT QUALITY flags defined within the body of this document apply, regardless of the DATA_SRCE. If the QC EFFORT > 0, the ELEMENT QUALITY flags will be defined in Appendix nn of the Condigital document (where nn = the value contained in the DATA_SRCE element).

0 = NCDC QC after 12/92
1 = NCDC QC prior to 1/93
2 = QC at source
3-7 = reserved
8 = no QC
9 = unknown

Missing values are 9. Occupies column 77.

DATA_SRCE
DATA SOURCE/FORMAT: This field indicates the data source for the Condigital soundings only. See appendices keyed to the data source values for details concerning the original source.

00 = TD6103 (NMC)
01 = TD6201 (U.S. National data set prior to 1/93)
02 = Standard Nonreal-Time Data Transfer Format
(Mostly MicroART - post 12/92)
03 = Mini Rawin System Format (MRS)
04 = TDAT/WDAT Format
06 = Manuscript
07 = Range standard
08 = MIT
09 = NCAR
10 = TDF54
11 = TDF56
12 = other PC-based, semiautomated reduction system
13 = Canadian upper air archives
14 = Former USSR
15 = Peoples' Republic of China (PRC)
16 = Argentina
17 = British Antarctica
18 = Hong Kong
19 = Korea
18-98 = reserved
99 = unknown

Missing values are 99. Occupies columns 79-80.

NUM_LVLS
NUMBER OF LEVELS: This is the number of data levels found in the sounding. Missing values are 0. Occupies columns 82-84.

INST_CODE
INSTRUMENT CODE: Seven-character string from Aerostan data set. Missing values are "???????." Occupies columns 86-92.

CLOUD_AMOUNT
CLOUD AMOUNT from Aerostan data set. Tenths of sky covered. Missing values are -9. Occupies columns 94-95.

CLOUD_AMOUNT_QLTY
CLOUD AMOUNT QUALITY from Aerostan data set. Missing values are -9. Occupies columns 97-98. 0 = No quality control
1 = correct
2 = doubtful value
3 = error
4 = corrected value
5 = original value missing; value produced
9 = missing data

LOWER_CLOUD
LOWER INFERIOR CLOUDS from Aerostan data set. Missing values are -9. Occupies columns 100-101.

0 = absence of clouds
1 = cumulus humilis
2 = cumulus humilis together with stratocumulus
3 = cumulonimbus calvus together with cumulus, stratocumulus or stratus
4 = stratocumulus cumulogenitus
5 = stratocumulus
6 = stratus and/or fractonimbus
7 = fractonimbus under altostratus or nimbostratus
8 = cumulus humilis together with cumulus congestus
9 = cumulonimbus capillatus, stratocumulus, stratus

LOWER_CLOUD_QLTY
LOWER INFERIOR CLOUDS QUALITY from Aerostan data set. Missing values are -9. Occupies columns 103-104. Refer to CLOUD_AMOUNT_QLTY for values.

CLOUD_HEIGHT
CLOUD HEIGHT from Aerostan data set (height of cloud base). Missing values are -9. Occupies columns 106-107.

0 = < 50 m
1 = 50-100 m
2 = 100-200 m
3 = 200-300 m
4 = 300-600 m
5 = 600-1000 m
6 = 1000-1500 m
7 = 1500-2000 m
8 = 2000-2500 m
9 = > 2500 m

CLOUD_HEIGHT_QLTY
CLOUD HEIGHT QUALITY from Aerostan data set. Missing values are -9. Occupies columns 109-110. Refer to CLOUD_AMOUNT_QLTY for values.

MID_CLOUD
MIDDLE CLOUD TYPE from Aerostan data set. Missing values are -9. Occupies columns 112-113.

1 = altostratus translucidus
2 = altostratus opacus or nimbostratus
3 = altocumulus translucidus
4 = altocumulus translucidus lenticularis
5 = altocumulus translucidus duplicatus or altocumulus opacus
6 = altocumulus cumulogenitus
7 = altocumulus opacus or duplicatus
8 = altocumulus cumuliformis, floccus, or castellatus
9 = altocumulus together with cirrus

MID_CLOUD_QLTY
MIDDLE CLOUD SHAPE QUALITY from Aerostan data set. Missing values are -9. Occupies columns 115-116. Refer to CLOUD_AMOUNT_QLTY for values.

HIGH_CLOUD
HIGH_LEVEL CLOUDS TYPE from Aerostan data set. Missing values are -9. Occupies columns 118-119.

1 = cirrus filosus
2 = cirrus densus
3 = cirrus nothus
4 = cirrus uncinus
5 = cirrus, cirrostratus
6 = cirrus, cirrostratus
7 = cirrostratus (all sky)
8 = cirrostratus (part of sky)
9 = cirrocumulus

HIGH_CLOUD_QLTY
HIGH_LEVEL CLOUDS SHAPE QUALITY from Aerostan data set. Missing values are -9. Occupies columns 121-122. Refer to CLOUD_AMOUNT_QLTY for values.

One or more of the following three text fields will appear at the end of each sounding's header in columns 124-325. For a given sounding, COMMENTS and OTHERFILEDATA may or may not be present but ORIGINAL_LATLON will always be there. No matter how many of the following three text fields are present, they will always occur in the order given below and will always begin in column 121.

COMMENTS
May or may not be present. Floppy data set contained key sequences of unknown meaning. If they were present for a given sounding, they will appear directly after HIGH_CLOUD_QLTY. This field can be 0 to 100 characters long (when present, usually contains 3-10 characters).

OTHERFILEDATA
May or may not be present. Soundings which are the product of merging two different sources may contain a text field containing the following:

TXT: YEAR MONTH DAY GMT_HOUR GMT_MINUTE LATITUDE LONGITUDE 3km data: PRESSURE TEMPERATURE HUMIDITY WIND_DIRECTION WIND_VELOCITY DPDP.

These are alternate values for some of the header and 3km level variables. This text field will start with the letters "TXT: " and continue with values for the above listed variables. After the value for LONGITUDE is given, the words "3km data:" may appear with the above listed variables following.

ORIGINAL_LATLON
Will be present in every sounding. Most soundings have new latitude and longitude position data from one of two independent sources, with the exception of those soundings whose dates were out of range for the independent sources. All soundings have this text field, which begins with the words "Old latlon" and follows with the position data from its original source. (Old latlon, LATITUDE LONGITUDE.)

Variables in Transmission Levels of Each Sounding:

LEVEL_CODE
LEVEL CODE is from the Aerostan data set. Missing values are 99. Occupies columns 1-2.

01 = surface
02 = significant level (not at mandatory level)
03 = tropopause (significant level)
04 = significant level for wind (not at mandatory level)
05 = max wind (not at mandatory level)
06 = level of wind shift (not at mandatory level)
10 = mandatory level (for pressure or altitude)
11 = surface and standard level coincide
12 = significant level (occurs at mandatory level)
13 = tropopause (occurs at mandatory level)
14 = significant wind level (occurs at mandatory level)
15 = max wind (occurs at mandatory level)
16 = wind shift (occurs at mandatory level)

ALTITUDE
Height of the pressure level in whole meters. Missing values are -999999. Occupies columns 4-10.

A_ALT_QLTY
Aerostan's quality indicator for the ALTITUDE field. Missing values are -9. Occupies columns 12-13. Refer to CLOUD_AMOUNT_QLTY for values.

K_ALT_QLTY
Kahl's quality indicator for the ALTITUDE field. Occupies column 15.

0 = FAIL
1 = PASS

PRESSURE
AIR PRESSURE of the data level in hPa. Missing values are 9999.99. Occupies columns 17-23.

A_PRES_QLTY
Aerostan's quality indicator for the PRESSURE field. Missing values are -9. Occupies columns 25-26. Refer to CLOUD_AMOUNT_QLTY for values.

K_PRES_QLTY
Kahl's quality indicator for the PRESSURE field. Occupies column 28.

0 = FAIL
1 = PASS

TEMPERATURE
AIR TEMPERATURE in degrees Celsius. Missing values are 99.99. Occupies columns 30-35.

A_TEMP_QLTY
Aerostan's quality indicator for the TEMPERATURE field. Missing values are -9. Occupies columns 37-38. Refer to CLOUD_AMOUNT_QLTY for values.

K_TEMP_QLTY
Kahl's quality indicator for the TEMPERATURE field. Occupies column 40.

0 = FAIL
1 = PASS

HUMIDITY
RELATIVE HUMIDITY ranging from 0 to 100 percent. Missing values are -99.9. Occupies columns 42-46.

K_HUMID_QLTY
Kahl's quality indicator for the HUMIDITY field. Occupies column 48.

0 = FAIL
1 = PASS

WIND_DIRECTION
WIND DIRECTION ranging from 0 to 360 degrees. Missing values are 999. Occupies columns 50-52.

A_WIND_DIR_QLTY
Aerostan's quality indicator for the WIND DIRECTION field. Missing values are -9. Occupies columns 54-55. Refer to CLOUD_AMOUNT_QLTY for values.

K_WIND_DIR_QLTY
Kahl's quality indicator for the WIND_DIRECTION field. Occupies column 57.

0 = FAIL
1 = PASS

WIND_VELOCITY
WIND VELOCITY in meters/second. Missing values are -99.9. Occupies columns 59-63.

A_WIND_SPD_QLTY
Aerostan's quality indicator for the WIND VELOCITY field. Missing values are -9. Occupies columns 65-66. Refer to CLOUD_AMOUNT_QLTY for values.

K_WIND_SPD_QLTY
Kahl's quality indicator for the WIND_VELOCITY field. Occupies column 68.

0 = FAIL
1 = PASS

LVL_QUAL
LEVEL QUALITY INDICATOR: Denotes the results of Condigital's quality controls applied to this level. Range is 0 to 9 as follows:

0

All available elements are correct

1

One or more elements are suspect; no replacement level exists

2

One or more elements are suspect; a replacement level exists

3

Operator (observer) deleted, no replacement level follows

4

NCDC edit/quality control has determined this level to be highly suspect

5-6

Reserved

7

Unknown

8

Replacement level

9

The level has not been checked

Missing values are 9. Occupies column 70.

DPDP
DEW POINT DEPRESSION (DEW POINT DEFICIT) at the current level in degrees Celsius. Missing values are 99.9. Occupies columns 72-75.

A_DPD_QLTY
Aerostan's quality indicator for the DEW POINT DEFICIT field. Missing values are -9. Occupies columns 77-78. Refer to CLOUD_AMOUNT_QLTY for values.

K_DPD_QLTY
Kahl's quality indicator for the DPDP field. Occupies column 80.

0 = FAIL
1 = PASS

TYP_LVL
TYPE OF LEVEL: Condigital's code indicating the reason for selection of the level. Range of values is 00-99.

00

Operator deleted level

01

Operator added level

02

Aircraft report

03

Dropsonde

04

Rocketsonde

05

Profiler

06

Reserved

07

Reserved

08

Reserved

09

Begin missing data (all elements)

10

End missing data (all elements)

11

Begin missing temperature data/doubtful altitude

12

End missing temperature data

13

Begin missing relative humidity/dew point depression data

14

End missing relative humidity/dew point depression data

15

Begin doubtful altitude data

16

Begin doubtful temperature, altitude data

17

End doubtful temperature data

18

Reserved

19

Reserved

20

Interpolated (generated) mandatory pressure level

21

Interpolated (generated) level other than a mandatory pressure level

22

Highest level reached before balloon descent because of icing or turbulence

23

Balloon re-ascended beyond previous highest level

24

Base pressure for stability index

25

Zero-degree crossing for the RADAT message

26

Tropopause

27

Maximum wind level

28

Below surface level

29

Reserved

30

Reserved

31

Surface level

32

Mandatory pressure level

33

Within 20 hectopascals (mb) of the surface

34

Flight termination level

35

Relative humidity level selection terminated

36

Pressure less than 10 hectopascals

37

Mandatory temperature level

38

Significant temperature level

39

Significant relative humidity level

40

Winds at constant height (above ground level)

41

Mandatory wind level

42

Significant wind level

43

Incremental wind level (e.g., 1-minute, fixed regional)

44

Significant thermodynamic level (reason for selection is unknown)

45

High resolution data sample

46

Other/unspecified

47

Generated winds at incremental heights

48-50

Reserved

51-99

***Used for those levels that satisfy the criteria for multiple types***

51-58

Reserved

59

Begin missing data (all elements) at a tropopause level

60

End missing data (all elements) at a tropopause level

61

Begin missing temperature data at a tropopause level

62

End missing temperature data at a tropopause level

63

Begin missing relative humidity/dew point depression data at a tropopause level

64

End missing relative humidity/dew point depression data at a tropopause level

65

Begin doubtful altitude data at a tropopause level

66

Begin doubtful temperature, altitude data at a tropopause level

67

End doubtful temperature data at a tropopause level

68

Reserved

69

Begin missing data (all elements) at a mandatory pressure level

70

End missing data (all elements) at a mandatory pressure level

71

Begin missing temperature data at a mandatory pressure level

72

End missing temperature data at a mandatory pressure level

73

Begin missing relative humidity/dew point depression data at a mandatory pressure level

74

End missing relative humidity/dew point depression data at a mandatory pressure level

75

Begin doubtful altitude data at a mandatory pressure level

76

Begin doubtful temperature, altitude data at a mandatory pressure level

77

End doubtful temperature data at a mandatory pressure level

78-80

Reserved

81

Level satisfies requirements for selection as a mandatory pressure level and as a tropopause level

82

Level satisfies requirements for selection as a mandatory pressure level and as a significant level

83

Level satisfies requirements for selection as a mandatory pressure level and as the surface level

84

Highest level reached before balloon descent because of icing or turbulence and is a mandatory level

85

Balloon re-ascended beyond previous highest level and is a mandatory level

86

Base pressure for stability index and is a mandatory level

87

Zero-degree crossing for the RADAT message and is a mandatory level

88

Maximum wind level and is a mandatory level

89

Tropopause level, maximum wind level, and mandatory level

90

Tropopause level and is a maximum wind level

91-99

Reserved

Missing values are -99. Occupies columns 82-84.

ELEMENT_QLTY
Condigital field. ELEMENT QUALITY FLAGS: These fields contain the result of any quality control procedures for identifying suspect and doubtful individual elements, and elements that failed QC checks. Descriptions of the element quality flags are contained in the appendices, which are keyed to the DATA_SRCE field. If, for example, the DATA_SRCE is 01 (source = TD6201), the appendix is numbered 02, etc. The Element Quality is assigned a value equivalent to the least correct flag.

The range of values is listed in each applicable appendix. Although the range of values for element quality flags are specific for each data source, as a general rule, any combination of ASCII characters, except lowercase letters and "#," is allowed in this element.

Record Position

Element Name

41-42

EQET (Elapsed Time)

43-44

EQP (Pressure/Ranging)

45-46

EQH (Height)

47-48

EQT (Temperature)

49-50

EQU (Humidity)

51-52

EQD (Dew Point Depression)

53-54

EQWDS (Wind Direction/Speed)

Missing values are "??????????????." Occupies columns 86-99.

NCDC_USE
Condigital field: Reserved for internal NCDC use. Missing values are *quot;??." Occupies columns 101-102.