Evaluation of balloon and satellite water vapour measurements in the Southern tropical and subtropical UTLS during the HIBISCUS campaign

Montoux, Nadège; Hauchecorne, Alain; Pommereau, Jean‐Pierre; Lefèvre, Franck; Durry, Georges; Jones, R. L.; Rozanov, A.; Dhomse, Sandip; Burrows, J. P.; Morel, Béatrice; Benchérif, Hassan

doi:10.5194/acp-9-5299-2009

Cited by 17 publications

(14 citation statements)

References 76 publications

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“…As an example, Fig. 10 shows the in situ measurements performed during a balloon slow descent between 20 and 12 km on 13 February together with the closest available satellite observations (Montoux et al, 2009). The µSDLA and SAW measurements in the upper troposphere show super-saturated mixing ratios (MR) up to the Lapse Rate Tropopause (LRT) at 15.2 km above which, the MR ranges between 3.5 and 5 ppm.…”

Section: Hydration Of the Lower Stratosphere Over Land Convective Sysmentioning

confidence: 99%

“…Using the same statistical method employed for ozone, Montoux et al (2009) (Fig. 20) showed that in the stratosphere, above 20 km, HALOE displays the best precision (2.5%), followed by SAGE II (7%), MI-PAS (10%), SAOZ (20-25%), GOMOS (25%) and SCIA-MACHY (35%).…”

Section: Water Vapourmentioning

confidence: 99%

“…The measurements degrade below where HALOE displays a systematic lo bias like that of ozone and MIPAS a fast decrease of precision. At these altitudes b measurements are those of AIRS [Montoux et al, 2009]. Fig.…”

Section: Ozonementioning

confidence: 99%

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An overview of the HIBISCUS campaign

et al. 2011

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Abstract. The EU HIBISCUS project consisted of a series of field campaigns during the intense convective summers in 2001, 2003 and 2004 in the State of São Paulo in Brazil. Its objective was to investigate the impact of deep convection on the Tropical Tropopause Layer (TTL) and the lower stratosphere by providing a new set of observational data on meteorology, tracers of horizontal and vertical transport, water vapour, clouds, and chemistry in the tropical Upper Troposphere/Lower Stratosphere (UT/LS). This was achieved using short duration research balloons to study local phenomena associated with convection over land, and long-durationCorrespondence to: J.-P. Pommereau (jean-pierre.pommereau@latmos.ipsl.fr) balloons circumnavigating the globe to study the contrast between land and oceans.Analyses of observations of short-lived tracers, ozone and ice particles show strong episodic local updraughts of cold air across the lapse rate tropopause up to 18 or 19 km (420-440 K) in the lower stratosphere by overshooting towers. The long duration balloon and satellite measurements reveal a contrast between the composition of the lower stratosphere over land and oceanic areas, suggesting significant global impact of such events. The overshoots are shown to be well captured by non-hydrostatic meso-scale Cloud Re- Weather Forecast Models (NWP) underestimating the overshooting process. Finally, the data collected by the HIBIS-CUS balloons have allowed a thorough evaluation of temperature NWP analyses and reanalyses, as well as satellite ozone, nitrogen oxide, water vapour and bromine oxide measurements in the tropics.

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Section: Hydration Of the Lower Stratosphere Over Land Convective Sysmentioning

confidence: 99%

Section: Water Vapourmentioning

confidence: 99%

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An overview of the HIBISCUS campaign

et al. 2011

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“…JLH and HWV agreed well during several field campaigns prior to 2003, after which JLH began to agree well with CFH and MLS. 3,13 To address these long-standing discrepancies, the CFH, JLH, FISH, and HWV instruments were compared under controlled laboratory conditions during the Aqua Validation and Intercomparison Experiment (AquaVIT) at the aerosol and cloud simulation chamber in Karlsruhe, Germany. 14 The comparison showed that all instruments agreed to within 0.4 ppmv in the lab, a stark contrast from the 1.5-2 ppmv disagreements in flight.…”

Section: Introductionmentioning

confidence: 91%

A new direct absorption tunable diode laser spectrometer for high precision measurement of water vapor in the upper troposphere and lower stratosphere

Sargent

Sayres²,

Smith³

et al. 2013

Review of Scientific Instruments

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We present a new instrument for the measurement of water vapor in the upper troposphere and lower stratosphere (UT∕LS), the Harvard Herriott Hygrometer (HHH). HHH employs a tunable diode near-IR laser to measure water vapor via direct absorption in a Herriott cell. The direct absorption technique provides a direct link between the depth of the observed absorption line and the measured water vapor concentration, which is calculated based on spectroscopic parameters in the HITRAN database. While several other tunable diode laser (TDL) instruments have been used to measure water vapor in the UT∕LS, HHH is set apart by its use of an optical cell an order of magnitude smaller than those of other direct absorption TDLs in operation, allowing for a more compact, lightweight instrument. HHH is also unique in its integration into a common duct with the Harvard Lyman-α hygrometer, an independent photo-fragment fluorescence instrument which has been thoroughly validated over 19 years of flight measurements. The instrument was flown for the first time in the Mid-latitude Airborne Cirrus Properties Experiment (MACPEX) on NASA's WB-57 aircraft in spring, 2011, during which it demonstrated in-flight precision of 0.1 ppmv (1 s) with 1-sigma uncertainty of 5% ± 0.7 ppmv. Since the campaign, changes to the instrument have lead to improved accuracy of 5% ± 0.2 ppmv as demonstrated in the laboratory. During MACPEX, HHH successfully measured water vapor at concentrations from 3.5 to 600 ppmv in the upper troposphere and lower stratosphere. HHH and Lyman-α, measuring independently but under the same sampling conditions, agreed on average to within 1% at water vapor mixing ratios above 20 ppmv and to within 0.3 ppmv at lower mixing ratios. HHH also agreed with a number of other in situ water vapor instruments on the WB-57 to within their stated uncertainties, and to within 0.7 ppmv at low water. This agreement constitutes a significant improvement over past in situ comparisons, in which differences of 1.5-2 ppmv were routinely observed, and demonstrates that the accuracy of HHH is consistent with other instruments which use a range of detection methods and sampling techniques.

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“…15 Such satelliteborne remote instruments as Microwave Limb Sounder (MLS)/Aura, Atmospheric Infrared Sounder (AIRS)/Aqua, COSMIC/FORMOSAT-3 or SAPHIR/Megha-Tropiques, retrieve profiles of water vapor in the troposphere and in the stratosphere. 15 Such satelliteborne remote instruments as Microwave Limb Sounder (MLS)/Aura, Atmospheric Infrared Sounder (AIRS)/Aqua, COSMIC/FORMOSAT-3 or SAPHIR/Megha-Tropiques, retrieve profiles of water vapor in the troposphere and in the stratosphere.…”

Section: Validation Of Satellites Water Vapor Measurementsmentioning

confidence: 99%

Introduction to the Maïdo Lidar Calibration Campaign dedicated to the validation of upper air meteorological parameters

Keckhut

Courcoux²,

Baray

et al. 2015

J. Appl. Remote Sens

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International audienceThe first operations at the new High-altitude Maïdo Observatory at La Réunion began in 2013. The Maïdo Lidar Calibration Campaign (MALICCA) was organized there in April 2013 and has focused on the validation of the thermodynamic parameters (temperature, water vapor, and wind) measured with many instruments including the new very large lidar for water vapor and temperature profiles. The aim of this publication consists of providing an overview of the different instruments deployed during this campaign and their status, some of the targeted scientific questions and associated instrumental issues. Some specific detailed studies for some individual techniques were addressed elsewhere. This study shows that temperature profiles were obtained from the ground to the mesopause (80 km) thanks to the lidar and regular meteorological balloon-borne sondes with an overlap range showing good agreement. Water vapor is also monitored from the ground to the mesopause by using the Raman lidar and microwave techniques. Both techniques need to be pushed to their limit to reduce the missing range in the lower stratosphere. Total columns obtained from global positioning system or spectrometers are valuable for checking the calibration and ensuring vertical continuity. The lidar can also provide the vertical cloud structure that is a valuable complementary piece of information when investigating the water vapor cycle. Finally, wind vertical profiles, which were obtained from sondes, are now also retrieved at Maïdo from the newly implemented microwave technique and the lidar. Stable calibrations as well as a small-scale dynamical structure are required to monitor the thermodynamic state of the middle atmosphere, ensure validation of satellite sensors, study the transport of water vapor in the vicinity of the tropical tropopause and study their link with cirrus clouds and cyclones and the impact of small-scale dynamics (gravity waves) and their link with the mean state of the mesosphere

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Evaluation of balloon and satellite water vapour measurements in the Southern tropical and subtropical UTLS during the HIBISCUS campaign

Cited by 17 publications

References 76 publications

An overview of the HIBISCUS campaign

An overview of the HIBISCUS campaign

A new direct absorption tunable diode laser spectrometer for high precision measurement of water vapor in the upper troposphere and lower stratosphere

Introduction to the Maïdo Lidar Calibration Campaign dedicated to the validation of upper air meteorological parameters

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