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In Situ Measurements of Wind and Turbulence by a Motor Glider in the Andes

Wildmann, Norman and Eckert, Ramona and Dörnbrack, Andreas and Gisinger, Sonja and Rapp, Markus and Ohlmann, Klaus and van Niekerk, Annelize (2021) In Situ Measurements of Wind and Turbulence by a Motor Glider in the Andes. Journal of Atmospheric and Oceanic Technology, 38 (4), pp. 921-935. American Meteorological Society. doi: 10.1175/JTECH-D-20-0137.1. ISSN 0739-0572.

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Official URL: https://journals.ametsoc.org/view/journals/atot/aop/JTECH-D-20-0137.1/JTECH-D-20-0137.1.xml

Abstract

A Stemme S10-VT motor glider was equipped with a newly developed sensor suite consisting of a five-hole probe, an inertial navigation and global navigation satellite system, two temperature sensors, and a humidity sensor. By design, the system provides three-dimensional wind vector data that enable the analysis of atmospheric motion scales up to a temporal resolution of 10 Hz. We give a description of components and installation of the system, its calibration, and its performance. The accuracy for the measurement of the wind vector is estimated to be on the order of 0.5 m s−1. As part of the Southern Hemisphere Transport, Dynamics, and Chemistry (SouthTRAC) field campaign, 30 research flights were performed from September 2019 to January 2020. We present statistical analysis of the observations, discriminating pure motor flights from soaring flights in the lee waves of the Andes. We present histograms of flight altitude, airspeed, wind speed and direction, temperature, and relative humidity to document the atmospheric conditions. Probability density functions of vertical air velocity, turbulence kinetic energy (TKE), and dissipation rate complete the statistical analysis. Altogether, 41% of the flights are in weak, 14% in moderate, and 0.4% in strong mountain wave conditions according to thresholds for the measured vertical air velocity. As an exemplary case study, we compare measurements on 11 September 2019 to a high-resolution numerical weather prediction model. The case study provides a meaningful example of how data from soaring flights might be utilized for model validation on the mesoscale and within the troposphere.

Item URL in elib:https://elib.dlr.de/142139/
Document Type:Article
Title:In Situ Measurements of Wind and Turbulence by a Motor Glider in the Andes
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Wildmann, NormanDLR, IPAhttps://orcid.org/0000-0001-9475-4206
Eckert, RamonaDLR, IPAUNSPECIFIED
Dörnbrack, AndreasDLR, IPAhttps://orcid.org/0000-0003-0936-0216
Gisinger, SonjaDLR, IPAhttps://orcid.org/0000-0001-8188-4458
Rapp, MarkusDLR, IPAhttps://orcid.org/0000-0003-1508-5900
Ohlmann, KlausQuo VadisUNSPECIFIED
van Niekerk, AnnelizeMet Office, Exeter, UKUNSPECIFIED
Date:1 April 2021
Journal or Publication Title:Journal of Atmospheric and Oceanic Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:38
DOI :10.1175/JTECH-D-20-0137.1
Page Range:pp. 921-935
Publisher:American Meteorological Society
ISSN:0739-0572
Status:Published
Keywords:Mountain waves; Turbulence; Wind; Aircraft observations
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Middle Atmosphere
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Institute of Atmospheric Physics
Deposited By: Wildmann, Norman
Deposited On:04 May 2021 08:59
Last Modified:31 May 2021 09:05

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