MIRAI MR08-05 Cloud Ceiling

Last Modified: 2014-08-02
: MR08-05
: 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) 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.
: MR08-05
: Raw
: JAMSTEC
: Cloud base height
:
ATMOSPHERE > CLOUDS > CLOUD BASE

Observation Map

Imagery reproduced from ...

Figures

Data List

File names
A8101102.DAT
A8101200.DAT
A8101300.DAT
A8101400.DAT
A8101500.DAT
A8101600.DAT
A8101700.DAT
A8101800.DAT
A8101900.DAT
A8102000.DAT
A8102100.DAT
A8102200.DAT
A8102300.DAT
A8102400.DAT
A8102500.DAT
A8102600.DAT
A8102700.DAT
A8102800.DAT
A8102900.DAT
A8103000.DAT
A8103100.DAT
A8110100.DAT
A8110200.DAT
A8110300.DAT
A8110400.DAT
A8110500.DAT
A8110600.DAT
: MR08-05
: 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
-		 -
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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		 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
-
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o
-		 -
o
o
o		 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		 Blower suspect(W)
Spare(W)
Spare(W)
Spare(W)
6 -
-
-
-		 -
-
-
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		 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		 -
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o
-		 -
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o
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		 -
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o
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o
o		 o
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-
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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

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MR08-05

Ship Name: MIRAI

Period: 2008-10-11 - 2008-11-07

Chief Scientist: Makio Honda (JAMSTEC)

Project Name: [Station K2,Station KNOT]

Proposal Title:
The study of ecosystem and materials' cycle in the North Pacific
Continuous surface meteorological measurements as a basic dataset
Community structure of surface zooplankton and its role on material' vertical transport
Study of distribution and optical characteristics of ice/water clouds and marine aerosols
Underway monitoring of low atmospheric and seawater radon (Rd) with high-sensitive radon detector
Micrometer particles size spectrum and microbial activities in a twilight zone
Rain and seawater sampling for stable isotopes
Standardization of marine geophysical data and its application to the ocean floor geodynamics studies
Full-depth analysis of microbial community structures and their auto- and heterotrophic activities
Study of the Pacific plate tectonics
Surface atmospheric turbulent flux measurement
Study of the global distribution and structure of oceanic cloud
Pilot study on carbon cycle of Marine Crenarchaeota in the North Pacific using geochemical and molecular biological approaches
Stable carbon and nitrogen isotopes of suspended particles

Update History

2014-08-02
An observation data was registerd.
2012-10-26
An observation data was registerd.