This is one of the upper air data sets developed for the North American Monsoon Experiment (NAME). This data set includes the high vertical resolution (approximately 10 second) tethersonde data from the Research Vessel (R/V) El Puma. During NAME the R/V El Puma conducted the ECAC-5 cruise (6-17 August 2004).
The release location was determined from a seperate navigational parameters file containing one minute data. The nearest minute in the navigational parameters file was used from the release time of the sounding.
An additional document Reporte-ECAC-5.doc was provided from the ECAC project that describes the methodology used by the Universidad Nacional Autonoma de Mexico (UNAM) in developing the data set. This document is in Spanish.
This dataset was not quality controlled by the University Corporation for Atmospheric Research Joint Office for Science Support (UCAR/JOSS).
Dr. Victor O. Magana Rueda
Departamento de Meteorologia General
Centro de Ciencias de la Atmosfera
Universidad Nacional Autonoma de Mexico
Ciudad Universitaria
04510 Mexico, D.F.
Phone: (525) 622 4088
Fax: (525) 616 0789
Email: victormr@servidor.unam.mx
All upper air soundings were converted to University Corporation for Atmospheric Research/Joint Office for Science Support (UCAR/JOSS) Cross Chain LORAN Atmospheric Sounding System (CLASS) Format (JCF). JCF is a version of the National Center for Atmospheric Research (NCAR) CLASS format and is an ASCII format consisting of 15 header records for each sounding followed by the data records with associated QC information.
The header records (15 total records) contain data type, project ID, site ID, site location, release time, sonde type, meteorological and wind data processors, and the operator's name and comments. The first five header lines contain information identifying the sounding, and have a rigidly defined form. The following 7 header lines are used for auxiliary information and comments about the sounding, and may vary from dataset to dataset. The last 3 header records contain header information for the data columns. Line 13 holds the field names, line 14 the field units, and line 15 contains dashes ('-' characters) delineating the extent of the field.
The five standard header lines are as follows:
| Line | Label (padded to 35 char) | Contents |
|---|---|---|
| 1 | Data Type: | Description of type and resolution of data. |
| 2 | Project ID: | Id of weather project. |
| 3 | Release Site Type/Site ID: | Description of the release site. |
| 4 | Release Location (lon,lat,alt): | Position of release site in the format described below. |
| 5 | UTC Release Time (y,m,d,h,m,s): | Time of release, in the format: yyyy, mm, dd, hh:mm:ss |
The release location is given as: lon (deg min), lat (deg min), lon (dec. deg), lat (dec. deg), alt (m)
Longitude in deg min is in the format: ddd mm.mm'W where ddd is the number of degrees from True North (with leading zeros if necessary), mm.mm is the decimal number of minutes, and W represents W or E for west or east longitude, respectively. Latitude has the same format as longitude, except there are only two digits for degrees and N or S for north/south latitude. The decimal equivalent of longitude and latitude and station elevation follow.
The seven non-standard header lines may contain any label and contents. The labels are padded to 35 characters to match the standard header lines. Records for this dataset include the following three non-standard header lines.
| 12 | Nominal Release Time (y,m,d,h,m,s): | Nominal time of release, in the format: yyyy, mm, dd, hh:mm:ss |
The data records each contain time from release, pressure, temperature, dew point, relative humidity, U and V wind components, wind speed and direction, ascent rate, balloon position data, altitude, and quality control flags (see the QC code description). Each data line contains 21 fields, separated by spaces, with a total width of 130 characters. The data are right-justified within the fields. All fields have one decimal place of precision, with the exception of latitude and longitude, which have three decimal places of precision. The contents and sizes of the 21 fields that appear in each data record are as follows:
| Field No. | Width | Format | Parameter | Units | Missing Value |
|---|---|---|---|---|---|
| 1 | 6 | F6.1 | Time | Seconds | 9999.0 |
| 2 | 6 | F6.1 | Pressure | Millibars | 9999.0 |
| 3 | 5 | F5.1 | Dry-bulb Temperature | Degrees C | 999.0 |
| 4 | 5 | F5.1 | Dew Point Temperature | Degrees C | 999.0 |
| 5 | 5 | F5.1 | Relative Humidity | Percent | 999.0 |
| 6 | 6 | F6.1 | U Wind Component | Meters / Second | 9999.0 |
| 7 | 6 | F6.1 | V Wind Component | Meters / Second | 9999.0 |
| 8 | 5 | F5.1 | Wind Speed | Meters / Second | 999.0 |
| 9 | 5 | F5.1 | Wind Direction | Degrees | 999.0 |
| 10 | 5 | F5.1 | Ascent Rate | Meters / Second | 999.0 |
| 11 | 8 | F8.3 | Longitude | Degrees | 9999.0 |
| 12 | 7 | F7.3 | Latitude | Degrees | 999.0 |
| 13 | 5 | F5.1 | Elevation Angle | Degrees | 999.0 |
| 14 | 5 | F5.1 | Azimuth Angle | Degrees | 999.0 |
| 15 | 7 | F7.1 | Altitude | Meters | 99999.0 |
| 16 | 4 | F4.1 | QC for Pressure | Code (see below) | 99.0 |
| 17 | 4 | F4.1 | QC for Temperature | Code (see below) | 99.0 |
| 18 | 4 | F4.1 | QC for Humidity | Code (see below) | 99.0 |
| 19 | 4 | F4.1 | QC for U Wind Component | Code (see below) | 99.0 |
| 20 | 4 | F4.1 | QC for V Wind Component | Code (see below) | 99.0 |
| 21 | 4 | F4.1 | QC for Ascension Rate | Code (see below) | 99.0 |
Fields 16 through 21 contain the Quality Control information derived at the UCAR Joint Office for Science Support (UCAR/JOSS). Any QC information from the original sounding is replaced by the following JOSS codes:
| Code | Description |
|---|---|
| 99.0 | Unchecked (QC information is "missing.") ("UNCHECKED") |
| 1.0 | Checked, datum seems physically reasonable. ("GOOD") |
| 2.0 | Checked, datum seems questionable on physical basis. ("MAYBE") |
| 3.0 | Checked, datum seems to be in error. ("BAD") |
| 4.0 | Checked, datum is interpolated. ("ESTIMATED") |
| 9.0 | Checked, datum was missing in original file. ("MISSING") |
The following is a sample record of El Puma NAME high resolution tethersonde data in JOSS CLASS format. The data portion is much longer than 80 characters and, therefore, wraps around to a second line. See section 2.1 for an exact format specification
Data Type: R/V El Puma Tethersonde Data Project ID: NAME Release Site Type/Site ID: XCUM R/V El Puma: Cruise ECAC-5 Release Location (lon,lat,alt): 107 29.46'W, 20 29.23'N, -107.491, 20.487, 999.0 UTC Release Time (y,m,d,h,m,s): 2004, 08, 06, 12:00:00 / / / / / / Nominal Release Time (y,m,d,h,m,s):2004, 08, 06 12:00:00 Time Press Temp Dewpt RH Ucmp Vcmp spd dir Wcmp Lon Lat Ele Azi Alt Qp Qt Qrh Qu Qv QdZ sec mb C C % m/s m/s m/s deg m/s deg deg deg deg m code code code code code code ------ ------ ----- ----- ----- ------ ------ ----- ----- ----- -------- ------- ----- ----- ------- ---- ---- ---- ---- ---- ---- 26.0 1012.1 31.5 24.3 65.7 0.3 -1.2 1.2 345.0 999.0 -107.491 20.487 999.0 999.0 99999.0 99.0 99.0 99.0 99.0 99.0 9.0 37.0 1012.0 31.1 24.4 67.2 -0.6 -0.8 1.0 39.0 999.0 9999.000 999.000 999.0 999.0 99999.0 99.0 99.0 99.0 99.0 99.0 9.0 47.0 1012.0 30.5 24.3 69.8 0.1 -1.2 1.2 357.0 999.0 9999.000 999.000 999.0 999.0 99999.0 99.0 99.0 99.0 99.0 99.0 9.0 58.0 1011.8 30.4 24.2 69.7 -0.1 -1.3 1.3 6.0 999.0 9999.000 999.000 999.0 999.0 99999.0 99.0 99.0 99.0 99.0 99.0 9.0 68.0 1011.9 31.2 24.1 65.9 0.1 -1.3 1.3 357.0 999.0 9999.000 999.000 999.0 999.0 99999.0 99.0 99.0 99.0 99.0 99.0 9.0 79.0 1012.0 31.4 24.2 65.4 0.1 -1.0 1.0 355.0 999.0 9999.000 999.000 999.0 999.0 99999.0 99.0 99.0 99.0 99.0 99.0 9.0
| ID | SITE | COUNTRY | LONG | LAT | ELEV (m) |
|---|---|---|---|---|---|
| XCUM | R/V El Puma: Cruise ECAC-5 | MX | 9999.0 | 999.0 | 99999.0 |
This dataset did not undergo any QC processing.
Loehrer, S. M., T. A. Edmands, and J. A. Moore, 1996: TOGA COARE upper-air sounding data archive: development and quality control procedures. Bull. Amer. Meteor. Soc., 77, 2651-2671.
Loehrer, S. M., S. F. Williams, and J. A. Moore, 1998: Results from UCAR/JOSS quality control of atmospheric soundings from field projects. Preprints, Tenth Symposium on Meteorological Observations and Instrumentation, Phoenix, AZ, Amer. Meteor. Soc., 1-6.