Omega Windfinding and GATE

Acheson, Donald T.

doi:10.1175/1520-0477(1974)055<0385:owag>2.0.co;2

Cited by 7 publications

(4 citation statements)

References 9 publications

(19 reference statements)

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“…Launch time and the time interval between launch to a specified altitude were recorded with the winds, so the closest wind profiler observation in time and height was matched to each rawinsonde observation and difference statistics were calculated. Acheson (1974) investigated sources of error with omega wind finding prior to the Global Atmospheric Research Program (GARP) Atlantic Tropical Experiment (GATE) and found that the accuracy of Omega tracking can be variable, with errors of 0.5-2 m s Ϫ1 depending on atmospheric signal propagation and the location of ground stations.…”

Section: Comparison Of Wind Profiler and Rawinsondementioning

confidence: 99%

“…MAE (median absolute error) is defined as the median magnitude of the difference scaled by the magnitude of the wind speed. Given these values and the accuracies determined by Acheson (1974) the rawinsonde and profiler winds compare quite well, with differences similar to those reported by May (1993). Statistics are also presented comparing the UHF and VHF wind profiler winds from 1990 to 2002 near 2 km, where the UHF and VHF data overlap (Table 3).…”

Section: Comparison Of Wind Profiler and Rawinsondementioning

confidence: 99%

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Wind Profiler Observations over the Central Equatorial Pacific: Optimizing Processing to Improve Quality and Height Coverage

Schäfer

Avery

Gage

et al. 2007

Journal of Atmospheric and Oceanic Technology

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UHF (boundary layer) and VHF (troposphere-stratosphere) wind profilers have operated at Christmas Island (2°N, 157°W) in the central equatorial Pacific from 1986 to 2002. Observed profiles of winds are sparse over the tropical oceans, but these are critical for understanding convective organization and the interaction of convection and waves. While the zonal winds below about 10 km have previously shown good agreement with the National Centers for Environmental Prediction-National Center for Atmospheric Research (NCEP-NCAR) reanalysis (RI), significant differences were found above a height of 10 km that were attributed to the low detectability of the wind signal in the profiler observations. Meridional winds at all levels show less agreement, with differences attributed to errors of representativeness and the sparseness of observations in the region. This paper builds on previous work using the Christmas Island wind profilers and presents the results of reprocessing the 17-yr profiler record with techniques that enhance the detectability of the signal at upper heights. The results are compared with nearby rawinsonde soundings obtained during a special campaign at Christmas Island and the RI, NCEP-Department of Energy (DOE) reanalysis (RII), and the 40-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-40). The newly processed profiler zonal and meridional wind observations show good agreement with rawinsonde observations from 0.5 to 19 km above sea level, with difference statistics similar to other studies. There is also significant improvement in the agreement of RI and RII reanalysis and profiler upper-level zonal and meridional winds from previous studies. A comparison of RII and ERA-40 reanalysis shows that difference statistics between the reanalyses are similar in magnitude to differences between the profiler and the individual reanalyses.

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Section: Comparison Of Wind Profiler and Rawinsondementioning

confidence: 99%

Section: Comparison Of Wind Profiler and Rawinsondementioning

confidence: 99%

Wind Profiler Observations over the Central Equatorial Pacific: Optimizing Processing to Improve Quality and Height Coverage

Schäfer

Avery

Gage

et al. 2007

Journal of Atmospheric and Oceanic Technology

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“…These steps are described below. Given the phase data there are several algorithms which will compute wind profiles, e.g., Govind (1973), Arndt and Reed (1973), Acheson (1974), etc. ; the one described below is essentially given by Passi (1974).…”

Section: Data-processing Techniquesmentioning

confidence: 99%

Carrier Balloon Windfinding Subsystem Evaluation

Passi

Olson

1974

Bulletin of the American Meteorological Society

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“…Unlike earlier dropsondes, which supplied only thermodynamic data, NAVAID-sondes provided wind information, basically by triangulation of signals from different transmitting stations (see Passi 1974 andGovind 1975 for a detailed discussion). First used extensively during the 1974 GARP Atlantic Tropical Experiment (GATE) (Acheson 1974), Omega navigation system-based dropwindsondes were a major supplement to the tropical upper-air observation network during the special observing periods of the 1979 Global Weather Experiment (Julian 1982) and contributed in a major way to both the Winter and Summer Monsoon experiments. Since then, many experiments, (e.g., STREX, GALE, OCEAN STORMS, AGASP, TAMEX, and ERICA) have used one or more DWS aircraft to specify synoptic-scale meteorological fields; DWS aircraft have also been used for operational synoptic reconnaissance flights about hurricanes (Burpee et al 1984).…”

Section: Introductionmentioning

confidence: 99%

The Selection and Use of Dropwindsonde-Equipped Aircraft for Operational Forecasting Applications

Douglas¹

1990

Bull. Amer. Meteor. Soc.

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This article discusses the feasibility of using dropwindsonde-equipped aircraft to obtain meteorological observations over oceanic data-void areas for operational forecasting applications. Such in-situ meteorological observations would provide measurements of wind, temperature, and moisture at a higher vertical resolution and greater accuracy than currently available from satellite-derived observations. Such airborne observations, if globally obtained, would greatly enhance global datasets for both numerical weather prediction and for research studies of large-scale phenomena, such as the El Nino/ Southern Oscillation. The aircraft could also serve as platforms for collecting frequent oceanic thermal and current information. The advantages and limitations of a dropwindsonde-based observing system are compared with current and proposed ground-and satellite based systems.

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Omega Windfinding and GATE

Abstract: An occasional series reporting on U.S. and international GARP scientific, technical, and planning activities, developments, and programs, presented as a public service to the meteorological community by the American Meteorological Society through arrangements with the U.

Cited by 7 publications

References 9 publications

Wind Profiler Observations over the Central Equatorial Pacific: Optimizing Processing to Improve Quality and Height Coverage

Wind Profiler Observations over the Central Equatorial Pacific: Optimizing Processing to Improve Quality and Height Coverage

Carrier Balloon Windfinding Subsystem Evaluation

The Selection and Use of Dropwindsonde-Equipped Aircraft for Operational Forecasting Applications

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