Climode Profiling Drifters

Table of Contents

  1. Introduction
  2. Automatic data processing & web-page generation
  3. Reliability statistics
  4. Argos Data Telemetry
  5. Contact Information
  6. Acknowledgements
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Introduction

Welcome to the unofficial web site on APEX floats for the Climode experiment. For information on participating laboratories, refer to the official CLIMODE web pages.

Automatic data processing, data distribution, & web-pages generation

This web site contains thousands of dynamic objects that must be updated as new data become available. Examples include postscript files, jpeg images, tables, HTML files, hydrographic profile data, and data distribution services. These objects are automatically generated or maintained in quasi-real-time by an extensible system of autonomous software. Consequently, maintaining this web site requires no regular manual intervention.

Reliability Statistics

The reliability of the floats can be measured in terms of the number of profiles expected during a specified time period as compared to the number actually executed. These statistics are presented in the following table (updated daily).

Profiling Drifter Reliability
Profiler Reliability Statistics
for the period from Nov 01 00:01 GMT 2005 to Oct 27 20:00 GMT 2013.
Group Size Profiles Executed Profiles Expected Reliability (%)
APEX260 12 1412 6895 20.5
APF8 12 1412 6895 20.5
Total 12 1412 6895 20.5

Argos Data Telemetry

The data are recovered from the floats via the Argos system. These floats spend 7 to 8 hours transmitting on the surface with one message transmitted every 46 to 54 seconds. This means that each float transmits from 470 to 530 messages for each profile. Most of these transmissions are lost because no satellite happens to be overhead. In fact, telemetry statistics below show that only 7 to 10 percent of these messages are transmitted when a satellite is overhead. Some statistics have wider appeal and we have collected several of them in the table below (updated daily). All of these statistics were computed on a per-profile basis.

Climode Profiling Drifter ARGOS Receipt Statistics
As of 20:00 GMT on Oct 27, 2013 Average Per-Profile Statistics for ARGOS Data Telemetry
Float
Id		 Profiles
Executed		 Incomplete
Profiles		 Satellite
Passes		 Telemetric
Efficiency		 Messages
Expected		 Messages
Received		 Messages
Missing		 Good
Messages		 Bad
Messages
2713 144 10 6.9% 23 51% 360 236 67% 124 33% 179 75% 57 25%
2719 140 17 12.1% 25 51% 372 246 67% 126 33% 187 76% 59 24%
2720 66 2 3.0% 23 55% 363 240 69% 123 31% 191 79% 49 21%
2721 131 9 6.9% 26 52% 400 258 68% 143 32% 199 77% 58 23%
2722 131 1 0.8% 29 64% 365 303 83% 63 17% 237 78% 65 22%
2723 110 12 10.9% 27 54% 382 263 69% 119 31% 205 77% 58 23%
2724 175 6 3.4% 24 56% 368 257 70% 111 30% 205 79% 53 21%
2725 71 3 4.2% 25 57% 349 248 72% 101 28% 195 79% 53 21%
2726 87 4 4.6% 22 53% 348 232 68% 116 32% 181 78% 50 22%
2827 165 0 0.0% 28 70% 430 351 82% 79 18% 300 85% 52 15%
2848 117 1 0.9% 30 69% 450 363 82% 87 18% 309 85% 54 15%
2849 87 2 2.3% 42 67% 616 479 80% 138 20% 401 84% 78 16%
Ensemble Average: 4.7% 27 58% 400 290 73% 111 27% 232 79% 57 21%
Standard Deviation: 3.9% 5 7% 75 74 6% 24 6% 69 3% 8 3%

Contact Information: Please note that the data and material on this web site are the property of the participating scientists of the CLIMODE experiment. Questions concerning the information available here can be addressed to Dr. Lynne Talley, (email: ltalley@ucsd.edu).

Acknowledgements:This project is funded by the National Science Foundation Ocean Sciences Division, grant NSF OCE-0424893.

This web site was developed and is maintained by Dana Swift (email:swift@ocean.washington.edu) at the University of Washington, Seattle, Washington.

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