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Performance assessment of balloon-borne trace gas sounding with the terahertz channel of TELIS

Xu, Jian and Schreier, Franz and Wetzel, Gerald and de Lange, Arno and Birk, Manfred and Trautmann, Thomas and Doicu, Adrian and Wagner, Georg (2018) Performance assessment of balloon-borne trace gas sounding with the terahertz channel of TELIS. Remote Sensing, 10, 315/1-315/31. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/rs10020315 ISSN 2072-4292

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Official URL: http://www.mdpi.com/2072-4292/10/2/315

Abstract

Short-term variations in the atmospheric environment over polar regions are attracting increasing attention with respect to the reliable analysis of ozone loss. Balloon-borne remote sensing instruments with good vertical resolution and flexible sampling density can act as a prototype to overcome the potential technical challenges in the design of new spaceborne atmospheric sensors and represent a valuable tool for validating spaceborne observations. A multi-channel cryogenic heterodyne spectrometer known as the TErahertz and submillimeter LImb Sounder (TELIS) has been developed. It allows limb sounding of the upper troposphere and stratosphere (10–40 km) within the far infrared (FIR) and submillimeter spectral regimes. This paper describes and assesses the performance of the profile retrieval scheme for TELIS with a focus on the ozone (O3), hydrogen chloride (HCl), carbon monoxide (CO), and hydroxyl radical (OH) measured during three northern polar campaigns in 2009, 2010, and 2011, respectively. The corresponding inversion diagnostics reveal that some forward/instrument model parameters play important roles in the total retrieval error. The accuracy of the radiometric calibration and the spectroscopic knowledge has a significant impact on retrieval at higher altitudes, whereas the pointing accuracy dominates the total error at lower altitudes. The TELIS retrievals achieve a vertical resolution of ∼2–3 km through most of the stratosphere below the balloon height. Dominant water vapor (H2O) contamination and low abundances of the target species reduce the retrieval sensitivity at the lowermost altitudes measured by TELIS. An extensive comparison shows that the TELIS profiles are consistent with profiles obtained by other limb sounders. The comparison appears to be very promising, except for discrepancies in the upper troposphere due to numerical regularization. This study not only consolidates the validity of balloon-borne TELIS FIR measurements, but also demonstrates the scientific relevance and technical feasibility of terahertz limb sounding of the stratosphere.

Item URL in elib:https://elib.dlr.de/119175/
Document Type:Article
Title:Performance assessment of balloon-borne trace gas sounding with the terahertz channel of TELIS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Xu, Jianjian.xu (at) dlr.dehttps://orcid.org/0000-0003-2348-125X
Schreier, FranzFranz.Schreier (at) dlr.dehttps://orcid.org/0000-0001-7196-6599
Wetzel, GeraldKarlsruhe Institute of Technology (KIT), Institute for Meteorology and Climate Research (IMK), 76021 Karlsruhe, GermanyUNSPECIFIED
de Lange, ArnoSRON Netherlands Institute for Space Research, Utrecht, the NetherlandsUNSPECIFIED
Birk, ManfredManfred.Birk (at) dlr.deUNSPECIFIED
Trautmann, ThomasThomas.Trautmann (at) dlr.deUNSPECIFIED
Doicu, AdrianAdrian.Doicu (at) dlr.deUNSPECIFIED
Wagner, GeorgGeorg.Wagner (at) dlr.deUNSPECIFIED
Date:February 2018
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:10
DOI :10.3390/rs10020315
Page Range:315/1-315/31
Editors:
EditorsEmail
Müller, Richardrichard.mueller@dwd.de
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2072-4292
Status:Published
Keywords:far infrared spectroscopy; balloon-borne limb sounding; stratospheric trace gases; inverse problems; TELIS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung, Vorhaben Spectroscopic Methods in Remote Sensing, R - Vorhaben IR-Sensorik, IR-Missionsprojekte
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Remote Sensing Technology Institute > Experimental Methods
Deposited By: Xu, Dr.-Ing. Jian
Deposited On:05 Mar 2018 10:27
Last Modified:14 Dec 2019 04:26

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