Global Tropical Moored Buoy Array: Wind Direction Accuracy Revisited

Freitag, Howard Paul; McPhaden, Michael J.; Connell, Kenneth J.

doi:10.25923/bn0n-3g25

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Global Tropical Moored Buoy Array: Wind Direction Accuracy Revisited

2019
By Freitag, Howard Paul ; McPhaden, Michael J. ; Connell, Kenneth J.
Series: NOAA technical memorandum OAR PMEL ; 150

[PDF-601.30 KB]

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Personal Author:

Freitag, Howard Paul ; McPhaden, Michael J. ; Connell, Kenneth J.

Freitag, Howard Paul ; McPhaden, Michael J. ; Connell, Kenneth J. Less -
Corporate Authors:

Oceanic and Atmospheric Research Laboratories (U.S.) ; Pacific Marine Environmental Laboratory (U.S.) ; University of Washington. Joint Institute for the Study of the Atmosphere and Ocean

Oceanic and Atmospheric Research Laboratories (U.S.) ; Pacific Marine Environmental Laboratory (U.S.) ; University of Washington. Joint Institute for the Study of the Atmosphere and Ocean Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean)

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean) Less -
Description:

This work follows a previous analysis of ATLAS wind direction accuracy (Freitag et al., 2001). Wind direction is measured by two sensors (Table 1): a compass measuring the orientation of the anemometer base relative to magnetic north and a vane measuring the wind direction relative to the base of the anemometer. Two compass types had been used in NX-ATLAS systems at the time of the 2001 analysis, the EG&G model 63674 (referred to hereafter as the EG&G) and the KVH model LP101 (referred to hereafter as the KVH). At that time, the EG&G compass was no longer available from the manufacturer, but these compasses were being transferred from older, standard ATLAS systems to the NX-ATLAS. NX-ATLAS pre-deployment ensemble error statistics were found to be comparable for the two compass types, with mean errors of 0.04° for the EG&G (computed from 135 calibrations) and 0.33° for the KVH (106 calibrations). RMS errors were 1.42° and 1.45°, respectively, which were comparable to the ATLAS system resolution. The RMS error of the EG&G was well below the manufacturer’s specified accuracy (5°) and the KVH slightly higher than its specified accuracy (1°). While not always clearly stated, manufacturer’s specifications often refer to newly calibrated instruments and may not reflect drift over time. Post-recovery errors for 111 EG&G compass calibration checks were 0.61° in the mean and 2.38° RMS, within the specified accuracy. There were only a few post-recovery calibration checks available for KVH compasses in 2001, but it was noted that errors appeared to be somewhat larger than those of the EG&G. A third compass was added to the NX-ATLAS inventory in 2004, the KVH model C100 (referred to hereafter as the C100).
Keywords:

[+]

Anemometer Errors, Scientific Magnetic Pole Measuring Instruments Oceanographic Buoys Orientation Statistics Weather Vanes Wind Direction Wind Forecasting
Series:

NOAA technical memorandum OAR PMEL ; 150
DOI:

https://doi.org/10.25923/bn0n-3g25
Document Type:

Technical Memorandum
Funding:

Contribution 4903 from NOAA Pacific Marine Environmental Laboratory ; Contribution 2019-1032 from Joint Institute for the Study of the Atmosphere and Ocean (JISAO)

Contribution 4903 from NOAA Pacific Marine Environmental Laboratory ; Contribution 2019-1032 from Joint Institute for the Study of the Atmosphere and Ocean (JISAO) Less -
Place as Subject:

Pacific Ocean ; Atlantic Ocean ; Indian Ocean

Pacific Ocean ; Atlantic Ocean ; Indian Ocean Less -
License:

https://creativecommons.org/publicdomain/zero/1.0/
Rights Information:

CC0 Public Domain
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:91e5ed094adbf039c638d352d168c66c6071de172db89bf65614a454daf2bc82
Download URL:

https://repository.library.noaa.gov/view/noaa/22055/noaa_22055_DS1.pdf
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Global Tropical Moored Buoy Array: Wind Direction Accuracy Revisited

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