MIRAI MR08-03 Cloud Ceiling

Last Modified: 2014-07-31
: MR08-03
: Raw
: JAMSTEC
: Cloud base height
:
ATMOSPHERE > CLOUDS > CLOUD BASE

For Using Data

Data Management Office
See Terms and Conditions about constrain of use.
See Terms and Conditions about data citation.
Instrument:
Ceilometer (- MR12-05Leg3)
Ceilometer is the system that measures cloud base height by laser pulse emitted vertically.
Up to three levels of cloud base can be detected by measuring the change of strength of backscatter signal.
And the cloud base height is calculated from the elapsed time from laser pulse emission to backscatter detection.
In case the cloud base is obscured, it measures the vertical visibility.
Manufacturer: Vaisala Inc.
Type: CT25K Ver2.01
Serial number: T18102
Measurement range: up to 7500m
Resolution: 15m
Sampling rate: 15-120 seconds available (60sec as default)
Accuracy: +-2% or +-1/2 * Resolution
Location: Compass deck bow side (18 meters high from sea surface)
Recording software: CT-VIEW Ver1.05 (before MR01-K04)
CT-VIEW Ver2.10 (MR01-K05 or later)
(1) CYMMDDHH.DAT(Ver1.05)およびAYMMDDHH.DAT(Ver2.10)のファイル命名規約は次のとおりです。
C or A : AおよびCに固定
Y : 西暦年の1の位
MM : 収録開始月(UTC)
DD : 収録開始日(UTC)
HH : 収録開始時刻(UTC)
(2) 設置高度補正は、行っておりません。
(3) 本クルーズでは、取得されたデータに下記に示すエラーがあります。
Date/Time : 収録データの日付時刻が正常に記録されていないデータ
Format : Format Descriptionと異なるフォーマットで記録されたデータ
DataLack : 収録間隔が119秒以上離れた場合
Start
Stop
File name Date,Time
File name Date,Time Remarks

A8071100.DAT 20080711,200529 - A8071100.DAT 20080711,200729 DataLack
: MR08-03
: Raw
: JAMSTEC
: Cloud base height
:
ATMOSPHERE > CLOUDS > CLOUD BASE

Observation Map

Imagery reproduced from ...

Figures

Data List

File names
A8070300.DAT
A8070400.DAT
A8070500.DAT
A8070600.DAT
A8070700.DAT
A8070800.DAT
A8070900.DAT
A8071000.DAT
A8071100.DAT
A8071200.DAT
A8071300.DAT
A8071400.DAT
A8071500.DAT
A8071600.DAT
A8071700.DAT
A8071800.DAT
A8071900.DAT
A8072000.DAT
A8072100.DAT
A8072200.DAT
A8072300.DAT
A8072400.DAT
A8072500.DAT
A8072600.DAT
A8072700.DAT
A8072800.DAT
A8072900.DAT
A8073000.DAT
A8073100.DAT
A8080100.DAT
A8080200.DAT
A8080300.DAT
A8080400.DAT
A8080500.DAT
: MR08-03
: Raw
: JAMSTEC

Ceiling Raw

The record length of the data file is 56 bytes.
No. Column Content Format Remarks
1 1 - 8 Date i4,i2,i2 YYYYMMDD (UTC)
2 10 - 15 Time i2,i2,i2 hhmmss (UTC)
3 17 - 19 Operating software a3 'CT0' : CT-VIEW
'CL0' : CL-VIEW
4 20 - 21 Software version i2 Version of operating software
5 22 Data status i1 1: Cloud base height/vertical visibility data
2: Cloud base height/vertical visibility, backscatter signal
6: Cloud base height/vertical visibility, cloud amount/height of cloud layer
7: Cloud base height/vertical visibility, backscatter signal, cloud amount/height of cloud layer
6 23 Spare character a1
7 25 Detection status i1 0: Clear
1: One cloud base detected
2: Two cloud bases detected
3: Three cloud bases detected
4: Full obscuration determined but no cloud base detected
5: Some obscuration detected but determined to transparent
8 26 Warning and alarm information a1 0: Self-check OK
W: At least one warning active, no alarms
A: At least one alarm active
See No.12;observation information
9 28 - 32 Lowest cloud base height or vertical visibility i5 In the case of detection status is 1,2 or 3: Lowest cloud base height
In the case of detection status is 4: Calculation of vertical visibility
In the case of detection status is 0 or 5: /////
Unit: See No.12;observation information
10 34 - 38 Second lowest cloud base height or highest signal detected i5 In the case of detection status is 2 or 3: Second lowest cloud base height
In the case of detection status is 4: Maximum height that a signal was detected
In the case of detection status is 0,1 or 5: /////
Unit: See No.12;observation information
11 40 - 44 Highest cloud base height i5 In the case of detection status is 3: Highest cloud base height
In the case of detection status is 0,1,2,4,5: /////
Unit: See No.12;observation information
12 46 - 53 Observation information a8 *1
13 55 - 56 Terminator a2 CR+LF
*1: Observation information
The information is presented using 8 bytes characters. Each character, indicated in hexadecimal character, shows the following meanings;
Byte Hexadecimal character (o:on, -:off) Message(A:alarm, W:warning)
0 1 2 3 4 5 6 7 8 9 A B C D E F
1 -
-
-
-
-
-
-
o
-
-
o
-
-
-
o
o
-
o
-
-
-
o
-
o
-
o
o
-
-
o
o
o
o
-
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-
o
-
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o
o
-
o
-
o
-
o
o
o
o
-
-
o
o
-
o
o
o
o
-
o
o
o
o
Laser temperature shut-off(A)
Laser failure(A)
Receiver failure(A)
Voltage failure(A)
2 -
-
-
-
-
-
-
o
-
-
o
-
-
-
o
o
-
o
-
-
-
o
-
o
-
o
o
-
-
o
o
o
o
-
-
-
o
-
-
o
o
-
o
-
o
-
o
o
o
o
-
-
o
o
-
o
o
o
o
-
o
o
o
o
Spare(A)
Spare(A)
Spare(A)
Spare(A)
3 -
-
-
-
-
-
-
o
-
-
o
-
-
-
o
o
-
o
-
-
-
o
-
o
-
o
o
-
-
o
o
o
o
-
-
-
o
-
-
o
o
-
o
-
o
-
o
o
o
o
-
-
o
o
-
o
o
o
o
-
o
o
o
o
Windows contaminated(W)
Battery low(W)
Laser power low(W)
Laser temperature high or low(W)
4 -
-
-
-
-
-
-
o
-
-
o
-
-
-
o
o
-
o
-
-
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o
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o
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o
-
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o
o
o
-
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o
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o
o
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o
-
o
-
o
o
o
o
-
-
o
o
-
o
o
o
o
-
o
o
o
o
Internal temperature high or low(W)
Voltage high or low(W)
Relative Humidity is > 85%(W)
Receiver cross-talk compensation poor(W)
5 -
-
-
-
-
-
-
o
-
-
o
-
-
-
o
o
-
o
-
-
-
o
-
o
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o
-
-
o
o
o
o
-
-
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o
-
-
o
o
-
o
-
o
-
o
o
o
o
-
-
o
o
-
o
o
o
o
-
o
o
o
o
Blower suspect(W)
Spare(W)
Spare(W)
Spare(W)
6 -
-
-
-
-
-
-
o
-
-
o
-
-
-
o
o
-
o
-
-
-
o
-
o
-
o
o
-
-
o
o
o
o
-
-
-
o
-
-
o
o
-
o
-
o
-
o
o
o
o
-
-
o
o
-
o
o
o
o
-
o
o
o
o
Blower is ON
Blower heater is ON
Internal heater is ON
Units are METERS if ON , else FEET
7 -
-
-
-
-
-
-
o
-
-
o
-
-
-
o
o
-
o
-
-
-
o
-
o
-
o
o
-
-
o
o
o
o
-
-
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o
-
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o
o
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o
-
o
-
o
o
o
o
-
-
o
o
-
o
o
o
o
-
o
o
o
o
Polling mode is ON
Working from battery
Single sequence mode is ON
Manual settings are effective
8 -
-
-
-
-
-
-
o
-
-
o
-
-
-
o
o
-
o
-
-
-
o
-
o
-
o
o
-
-
o
o
o
o
-
-
-
o
-
-
o
o
-
o
-
o
-
o
o
o
o
-
-
o
o
-
o
o
o
o
-
o
o
o
o
Tilt angle is > 45 degrees
High background radiance
Manual blower control
Spare

Related Information

Update History

2014-07-31
An observation data was registerd.
2012-10-26
An observation data was registerd.