MIRAI MR17-05C Cloud Ceiling

Last Modified: 2018-03-21
: MR17-05C
: 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.

2017-08-24 00:10 – 2017-10-01 00:00

Instrument:
Ceilometer (MR13-02B - )
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: CL51
Serial number: J0510004
Measurement range: up to 15000m (Backscatter measuement)
up to 13000m (Cloud detection)
Resolution: 10m
Sampling rate: 10-120 seconds available (36sec as default)
Accuracy: greater of +-1% or +-5m
Location: Compass deck bow side (18 meters high from sea surface)
Recording software: CL-VIEW Ver2.00 (after MR13-02B Leg1)
(1) File naming rule for YYMMDDHH.DAT(CL-VIEW Ver2.00).
YY :Year in 2 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.
: MR17-05C
: Raw
: JAMSTEC
: Cloud base height
:
ATMOSPHERE > CLOUDS > CLOUD BASE

Observation Map

Imagery reproduced from ...

Figures

Data List

File names
17082400.DAT
17082500.DAT
17082600.DAT
17082700.DAT
17082800.DAT
17082900.DAT
17083000.DAT
17083100.DAT
17090100.DAT
17090200.DAT
17090300.DAT
17090400.DAT
17090500.DAT
17090600.DAT
17090700.DAT
17090800.DAT
17090900.DAT
17091000.DAT
17091100.DAT
17091200.DAT
17091300.DAT
17091400.DAT
17091500.DAT
17091600.DAT
17091700.DAT
17091800.DAT
17091900.DAT
17092000.DAT
17092100.DAT
17092200.DAT
17092300.DAT
17092400.DAT
17092500.DAT
17092600.DAT
17092700.DAT
17092800.DAT
17092900.DAT
17093000.DAT
: MR17-05C
: 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
-
-
-
o
-
-
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
-
-
-
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
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
-
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 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
-
-
-
o
-
-
o
o
-
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

2018-03-21
An observation data was registerd.