CLIWOC release 1.1
(23 January 2004)
This release of CLIWOC allows
for preliminary research that may be used for publications before
the final database is released. Most of the available data is
included in this release. Another release will follow in the spring
of 2004. In this release an ASCII version of the CLIWOC database
is presented in IMMA format (see below).
As the user may notice, there are several fields in the IMMA-records
that are not used. Since a lot of work has been done to get this
release working properly, we had to decide to postpone presenting
additional information in this format.
Since little or no evidence is
available, yet, that the reported wind directions were other than
relative to Magetic North, a correction for the local magnetic variation
- derived from input from Leeds University, given the position and
year of observation - was applied to all wind directions.
The file is in ASCII format and contains 239,853 records of 110 characters
long (including CR/LF). The records are built according to the proposed
format, given in the IMMA document, updated 22 July 2003 (
www.cdc.noaa.gov/coads/e-doc/imma/imma.pdf).
The idea behind this format is that the user can easily start with
the data, without having to concern about unit conversions.
It is all expressed in present day SI-units (e.g. UTC, Celsius, nautical
miles, degrees, m/s and hPa). In the laboring process of keying
the data from different sources, duplicate records may have been keyed
when more than one source was available from the same voyage. Usually
these records are not exact copies, but are more or less complementary
to each other. The identification of the duplicates is handled in
the ShipLogbookID file (shiplogbookid1.1.txt).
If the user wants to avoid duplicates, he/she has to ignore those
ID’s that have the Duplicate-field in the ShipLogbookID file
set to other values than 0.
In the following table the record
in the file cliwoc1.1.txt is explained.
|
Variable
|
Start
|
End
|
Format
|
Description
|
|
YR
|
1
|
4
|
A4
|
Year (UTC)
|
|
MO
|
5
|
6
|
A2
|
Month (UTC)
|
|
DY
|
7
|
8
|
A2
|
Day (UTC)
|
|
HR
|
9
|
12
|
A4
|
Hour (UTC)
|
|
LAT
|
13
|
17
|
A5
|
Latitude in hundredths of a degree;
North of the equator is positive, South of the equator is negative
|
|
LON
|
18
|
23
|
A6
|
Longitude in hundredths of a degree;
convention: 0-359.99, East of Greenwich
|
|
IM
|
24
|
25
|
A2
|
IMMA version; 0 = this prototype
version
|
|
ATTC
|
26
|
26
|
A1
|
Attachment Count; presently still
0
|
|
TI
|
27
|
27
|
A1
|
Time indicator; only 0 (= nearest
whole hour)
|
|
LI
|
28
|
28
|
A1
|
Latitude/longitude indicator; for
this moment still 6 (= other)
|
|
DS
|
29
|
29
|
A1
|
Not in use
|
|
VS
|
30
|
30
|
A1
|
Not in use
|
|
NID
|
31
|
32
|
A2
|
Not in use
|
|
II
|
33
|
34
|
A2
|
ID indicator; all 10 (= composite
information from early ship data).
|
|
ID
|
35
|
43
|
A9
|
Identification; In this release
a number is given that identifies the ship and the ships’
logbook and the possibility that the current record is a duplicate.
With this number you can look up
this information in the file: shiplogbookid1.1.txt
|
|
C1
|
44
|
45
|
A2
|
Country code; gives the nationality
of the ship that made the observation:
ES = Spain
FR = France
NL = The Netherlands
UK = United Kingdom
|
|
DI
|
46
|
46
|
A1
|
Not in use
|
|
D
|
47
|
49
|
A3
|
Wind direction (from which the
wind is blowing) in whole degrees from 1-360; 361 = calm, 362
= variable.
|
|
WI
|
50
|
50
|
A1
|
Wind speed indicator; all reported
wind forces are more or less given in “Beaufort”
classes (WI = 5); Much work still has to be done on the translation
from the descriptive terms to a reduced set of wind forces.
|
|
W
|
51
|
53
|
A3
|
Wind speed; given in tenths of a meter
per second. From the descriptive terms of wind force given in
the observations, a first division into “Beaufort”
classes resulted in the m/s given here. Most of the values are
the midpoints of each Beaufort class, cf. WMO-1100. In those
cases that more information was available, other values may
have been used.
Bft 0: 0-0.2 m/s
Bft 1: 0.3-1.5 m/s
Bft 2: 1.6-3.3 m/s
Bft 3: 3.4-5.4 m/s
Bft 4: 5.5-7.9 m/s
Bft 5: 8.0-10.7 m/s
Bft 6: 10.8-13.8 m/s
Bft 7: 13.9-17.1 m/s
Bft 8 17.2-20.7 m/s
Bft 9: 20.8-24.4 m/s
Bft 10: 24.5-28.4 m/s
Bft 11: 28.5-32.6 m/s
Bft 12: >32.6 m/s
|
|
54
|
54
|
A1
|
Not in use
|
|
VV
|
55
|
56
|
A2
|
Not in use
|
|
WW
|
57
|
58
|
A2
|
Not in use
|
|
W1
|
59
|
59
|
A1
|
Not in use
|
|
SLP
|
60
|
64
|
A5
|
Sea level pressure in tenths of
hPa. Still under study; No temperature correction was applied
and for this moment the following factors have been used for
the conversion to hPa:
2.54 cm in an inch
13.596 specific gravity of mercury
980.65 cm/s gravity at 45°
latitude
|
|
A
|
65
|
65
|
A1
|
Not in use
|
|
PPP
|
66
|
68
|
A3
|
Not in use
|
|
IT
|
69
|
69
|
A1
|
Indicator for air temperatures,
originating from:
3 = mixed precision Celsius
7 = mixed precision Fahrenheit
9 = mixed precision Réaumur
|
|
AT
|
70
|
73
|
A4
|
Air temperature in tenths of a
degree Celsius
|
|
WBTI
|
74
|
74
|
A1
|
Not in use
|
|
WBT
|
75
|
78
|
A4
|
Not in use
|
|
DPTI
|
79
|
79
|
A1
|
Not in use
|
|
DPT
|
80
|
83
|
A4
|
Not in use
|
|
SI
|
84
|
85
|
A2
|
Method by which SST was taken;
10 = “implied” bucket
|
|
SST
|
86
|
89
|
A4
|
Sea surface temperature in tenths
of a degree Celsius
|
|
N
|
90
|
90
|
A1
|
Not in use
|
|
NH
|
91
|
91
|
A1
|
Not in use
|
|
CL
|
92
|
92
|
A1
|
Not in use
|
|
HI
|
93
|
93
|
A1
|
Not in use
|
|
H
|
94
|
94
|
A1
|
Not in use
|
|
CM
|
95
|
95
|
A1
|
Not in use
|
|
CH
|
96
|
96
|
A1
|
Not in use
|
|
WD
|
97
|
98
|
A2
|
Not in use
|
|
WP
|
99
|
100
|
A2
|
Not in use
|
|
WH
|
101
|
102
|
A2
|
Not in use
|
|
SD
|
103
|
104
|
A2
|
Not in use
|
|
SP
|
105
|
106
|
A2
|
Not in use
|
|
SH
|
107
|
108
|
A2
|
Not in use
|
The file is in ASCII format and contains 1,831 records of 67 characters
long (including CR/LF).
In the following table the record is explained.
|
Variable
|
Start
|
End
|
Format
|
Description
|
|
ID
|
1
|
4
|
A4
|
Identification number of the Ship
and Logbook
|
|
Shipname
|
5
|
34
|
A30
|
Name of the ship that made the
observation
|
|
LogbookID
|
35
|
64
|
A30
|
Logbook identification number
|
|
Duplicate
|
65
|
65
|
A1
|
Duplicate or original; 0=original,
1=first duplicate, 2=second duplicate, etc.
|
|