MIRAI MR05-05 Leg2 Cloud Ceiling

Last Modified: 2014-07-26
: MR05-05 Leg2
: Raw
: 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) File naming rule for CYMMDDHH.DAT(Ver1.05) and AYMMDDHH.DAT(Ver2.10).
C or A : Fixed as 'C' or 'A'
Y : Year in 1 digit
MM : Recording start month (UTC)
DD : Recording start day (UTC)
HH : Recording start time (UTC)
(2) Adjustment for the height : No sea surface level adjustment is applied to the raw data.
: MR05-05 Leg2
: Raw
: Cloud base height
:
ATMOSPHERE > CLOUDS > CLOUD BASE

Observation Map

Figures

Data List

File names
A5112703.DAT
A5112800.DAT
A5112900.DAT
A5113000.DAT
A5120100.DAT
A5120200.DAT
A5120300.DAT
A5120400.DAT
A5120500.DAT
A5120600.DAT
A5120700.DAT
A5120800.DAT
A5120900.DAT
A5121000.DAT
A5121100.DAT
A5121200.DAT
A5121300.DAT
A5121400.DAT
A5121500.DAT
A5121600.DAT
A5121700.DAT
A5121800.DAT
A5121900.DAT
A5122000.DAT
A5122100.DAT
A5122200.DAT
A5122300.DAT
A5122400.DAT
A5122500.DAT
A5122600.DAT
A5122700.DAT
A5122800.DAT
A5122900.DAT
A5123000.DAT
A5123100.DAT
A6010100.DAT
A6010200.DAT
A6010300.DAT
A6010400.DAT
A6010500.DAT
A6010600.DAT
A6010700.DAT
A6010800.DAT
A6010900.DAT
A6011000.DAT
A6011100.DAT
A6011200.DAT
A6011300.DAT
A6011400.DAT
A6011500.DAT
A6011600.DAT
A6011700.DAT
: MR05-05 Leg2
: Raw

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 Unit ID a3 Fixed as 'CT0'
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 -
-
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-
-
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o
-
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o
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o
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o
o
o
o
-
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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
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o
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o
o
o
-
-
o
o
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o
o
o
o
-
o
o
o
o
Spare(A)
Spare(A)
Spare(A)
Spare(A)
3 -
-
-
-
-
-
-
o
-
-
o
-
-
-
o
o
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o
-
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o
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o
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o
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o
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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
-
-
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o
o
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o
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o
o
o
o
-
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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
-
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o
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o
o
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o
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o
o
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o
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o
o
-
o
o
o
o
Blower suspect(W)
Spare(W)
Spare(W)
Spare(W)
6 -
-
-
-
-
-
-
o
-
-
o
-
-
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o
o
-
o
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-
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o
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o
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o
o
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o
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o
o
-
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o
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o
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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 -
-
-
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-
o
-
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o
-
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o
o
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o
o
o
o
-
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o
o
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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
-
-
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o
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o
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o
o
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o
o
o
o
-
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o
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o
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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

2014-07-26
An observation data was registerd.
2012-11-25
An observation data was registerd.