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Towards a Fast, Open-Path Laser Hygrometer for Airborne Eddy Covariance Measurements. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11115189] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Water vapor fluxes play a key role in the energy budget of the atmosphere, and better flux measurements are needed to improve our understanding of the formation of clouds and storms. Large-scale measurements of these fluxes are possible by employing the eddy correlation (EC) method from an aircraft. A hygrometer used for such measurements needs to deliver a temporal resolution of at least 10 Hz while reliably operating in the harsh conditions on the exterior of an aircraft. Here, we present a design concept for a calibration-free, first-principles, open-path dTDLAS hygrometer with a planar, circular and rotationally symmetric multipass cell with new, angled coupling optics. From our measurements, the uncertainty of the instrument is estimated to be below 4.5% (coverage factor k = 1). A static intercomparison between a dTDLAS prototype of the new optics setup and a traceable dew point mirror hygrometer was conducted and showed a systematic relative deviation of 2.6% with a maximal relative error of 2.2%. Combined with a precision of around 1 ppm H2O at tropospheric conditions, the newly designed setup fulfills the static precision and accuracy requirements of the proposed airborne EC hygrometer.
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Petzold A, Krämer M, Neis P, Rolf C, Rohs S, Berkes F, Smit HGJ, Gallagher M, Beswick K, Lloyd G, Baumgardner D, Spichtinger P, Nédélec P, Ebert V, Buchholz B, Riese M, Wahner A. Upper tropospheric water vapour and its interaction with cirrus clouds as seen from IAGOS long-term routine in situ observations. Faraday Discuss 2017; 200:229-249. [PMID: 28574551 DOI: 10.1039/c7fd00006e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
IAGOS (In-service Aircraft for a Global Observing System) performs long-term routine in situ observations of atmospheric chemical composition (O3, CO, NOx, NOy, CO2, CH4), water vapour, aerosols, clouds, and temperature on a global scale by operating compact instruments on board of passenger aircraft. The unique characteristics of the IAGOS data set originate from the global scale sampling on air traffic routes with similar instrumentation such that the observations are truly comparable and well suited for atmospheric research on a statistical basis. Here, we present the analysis of 15 months of simultaneous observations of relative humidity with respect to ice (RHice) and ice crystal number concentration in cirrus (Nice) from July 2014 to October 2015. The joint data set of 360 hours of RHice-Nice observations in the global upper troposphere and tropopause region is analysed with respect to the in-cloud distribution of RHice and related cirrus properties. The majority of the observed cirrus is thin with Nice < 0.1 cm-3. The respective fractions of all cloud observations range from 90% over the mid-latitude North Atlantic Ocean and the Eurasian Continent to 67% over the subtropical and tropical Pacific Ocean. The in-cloud RHice distributions do not depend on the geographical region of sampling. Types of cirrus origin (in situ origin, liquid origin) are inferred for different Nice regimes and geographical regions. Most importantly, we found that in-cloud RHice shows a strong correlation to Nice with slightly supersaturated dynamic equilibrium RHice associated with higher Nice values in stronger updrafts.
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Affiliation(s)
- Andreas Petzold
- Forschungszentrum Jülich, IEK-8 Troposphere, Jülich, Germany.
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Schmidt T, Cammas JP, Smit HGJ, Heise S, Wickert J, Haser A. Observational characteristics of the tropopause inversion layer derived from CHAMP/GRACE radio occultations and MOZAIC aircraft data. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2010jd014284] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- T. Schmidt
- Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences; Potsdam Germany
| | - J.-P. Cammas
- Laboratoire d'Aerologie; Observatoire Midi-Pyrénées, CNRS; Toulouse France
| | - H. G. J. Smit
- Institute for Energy and Climate Research: Troposphere; Research Centre Jülich; Jülich Germany
| | - S. Heise
- Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences; Potsdam Germany
| | - J. Wickert
- Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences; Potsdam Germany
| | - A. Haser
- Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences; Potsdam Germany
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Saunois M, Mari C, Thouret V, Cammas JP, Peyrillé P, Lafore JP, Sauvage B, Volz-Thomas A, Nédélec P, Pinty JP. An idealized two-dimensional approach to study the impact of the West African monsoon on the meridional gradient of tropospheric ozone. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007jd008707] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kley D, Smit HGJ, Nawrath S, Luo Z, Nedelec P, Johnson RH. Tropical Atlantic convection as revealed by ozone and relative humidity measurements. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2007jd008599] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Oikonomou EK, O'Neill A. Evaluation of ozone and water vapor fields from the ECMWF reanalysis ERA-40 during 1991–1999 in comparison with UARS satellite and MOZAIC aircraft observations. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2004jd005341] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bortz SE, Prather MJ, Cammas JP, Thouret V, Smit H. Ozone, water vapor, and temperature in the upper tropical troposphere: Variations over a decade of MOZAIC measurements. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jd006512] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kuell V. Tropopause region temperatures and CFC 11 mixing ratios from CRISTA 2. ACTA ACUST UNITED AC 2005. [DOI: 10.1029/2004jd005592] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Flamant C. SSM/I integrated water vapor content measurements in coastal regions: A comparison with shipborne and airborne remote sensing measurements, radiosonde measurements, and NWP model retrievals. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2001jc001068] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Offermann D, Schaeler B, Riese M, Langfermann M, Jarisch M, Eidmann G, Schiller C, Smit HGJ, Read WG. Water vapor at the tropopause during the CRISTA 2 mission. ACTA ACUST UNITED AC 2002. [DOI: 10.1029/2001jd000700] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- D. Offermann
- Department of Physics; University of Wuppertal; Wuppertal Germany
| | - B. Schaeler
- Department of Physics; University of Wuppertal; Wuppertal Germany
| | - M. Riese
- Institute of Chemistry and Dynamics of the Geosphere; Research Center Juelich GmbH; Juelich Germany
| | - M. Langfermann
- Daimler-Benz-Aerospace; Dornier GmbH; Friedrichshafen Germany
| | - M. Jarisch
- Department of Physics; University of Wuppertal; Wuppertal Germany
| | | | - C. Schiller
- Institute of Chemistry and Dynamics of the Geosphere; Research Center Juelich GmbH; Juelich Germany
| | - H. G. J. Smit
- Institute of Chemistry and Dynamics of the Geosphere; Research Center Juelich GmbH; Juelich Germany
| | - W. G. Read
- Jet Propulsion Laboratory; Pasadena California USA
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Stohl A, James P, Forster C, Spichtinger N, Marenco A, Thouret V, Smit HGJ. An extension of Measurement of Ozone and Water Vapour by Airbus In-service Aircraft (MOZAIC) ozone climatologies using trajectory statistics. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2001jd000749] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Cho JYN, Thouret V, Newell RE, Marenco A. Isentropic scaling analysis of ozone in the upper troposphere and lower stratosphere. ACTA ACUST UNITED AC 2001. [DOI: 10.1029/2000jd900733] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Gierens K, Schumann U, Helten M, Smit H, Wang PH. Ice-supersaturated regions and subvisible cirrus in the northern midlatitude upper troposphere. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/2000jd900341] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Thouret V, Cho JYN, Newell RE, Marenco A, Smit HGJ. General characteristics of tropospheric trace constituent layers observed in the MOZAIC program. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/2000jd900238] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Schumann U, Schlager H, Arnold F, Ovarlez J, Kelder H, Hov Ø, Hayman G, Isaksen ISA, Staehelin J, Whitefield PD. Pollution from aircraft emissions in the North Atlantic flight corridor: Overview on the POLINAT projects. ACTA ACUST UNITED AC 2000. [DOI: 10.1029/1999jd900941] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Stohl A, Trickl T. A textbook example of long-range transport: Simultaneous observation of ozone maxima of stratospheric and North American origin in the free troposphere over Europe. ACTA ACUST UNITED AC 1999. [DOI: 10.1029/1999jd900803] [Citation(s) in RCA: 218] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Helten M, Smit HGJ, Kley D, Ovarlez J, Schlager H, Baumann R, Schumann U, Nedelec P, Marenco A. In-flight comparison of MOZAIC and POLINAT water vapor measurements. ACTA ACUST UNITED AC 1999. [DOI: 10.1029/1999jd900315] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Newell RE, Thouret V, Cho JYN, Stoller P, Marenco A, Smit HG. Ubiquity of quasi-horizontal layers in the troposphere. Nature 1999. [DOI: 10.1038/18642] [Citation(s) in RCA: 111] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Cammas JP, Jacoby-Koaly S, Suhre K, Rosset R, Marenco A. Atlantic subtropical potential vorticity barrier as seen by Measurements of Ozone by Airbus In-Service Aircraft (MOZAIC) flights. ACTA ACUST UNITED AC 1998. [DOI: 10.1029/98jd01883] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Law KS, Plantevin PH, Shallcross DE, Rogers HL, Pyle JA, Grouhel C, Thouret V, Marenco A. Evaluation of modeled O3using Measurement of Ozone by Airbus In-Service Aircraft (MOZAIC) data. ACTA ACUST UNITED AC 1998. [DOI: 10.1029/98jd01482] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Marenco A, Thouret V, Nédélec P, Smit H, Helten M, Kley D, Karcher F, Simon P, Law K, Pyle J, Poschmann G, Von Wrede R, Hume C, Cook T. Measurement of ozone and water vapor by Airbus in-service aircraft: The MOZAIC airborne program, an overview. ACTA ACUST UNITED AC 1998. [DOI: 10.1029/98jd00977] [Citation(s) in RCA: 399] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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