First detection of tidal behaviour in polar mesospheric water vapour by ground based microwave spectroscopy

Hallgren, K.; Hartogh, P.

doi:10.5194/acp-12-3753-2012

Cited by 13 publications

(9 citation statements)

References 34 publications

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“…Interactions with the semidiurnally varying vertical velocity form a characteristic steep reversal of water anomalies at 40 km by pushing water up and down twice per day (cf. to Earth, Hallgren & Hartogh, 2012). The magnitude of the diurnal variations of water vapor at the "bottleneck" altitude around 60 km is 30-50 ppmv.…”

Section: Local Time Variationsmentioning

confidence: 99%

Seasonal Water “Pump” in the Atmosphere of Mars: Vertical Transport to the Thermosphere

Shaposhnikov

Medvedev

Rodin

et al. 2019

Geophysical Research Letters

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We present results of simulations with the Max Planck Institute Martian general circulation model implementing a hydrological cycle scheme. The simulations reveal a seasonal water “pump” mechanism responsible for the upward transport of water vapor. This mechanism occurs in high latitudes above 60° of the southern hemisphere at perihelion, when the upward branch of the meridional circulation is particularly strong. A combination of the mean vertical flux with variations induced by solar tides facilitates penetration of water across the “bottleneck” at approximately 60 km. The meridional circulation then transports water across the globe to the northern hemisphere. Since the intensity of the meridional cell is tightly controlled by airborne dust, the water abundance in the thermosphere strongly increases during dust storms.

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Section: Local Time Variationsmentioning

confidence: 99%

Seasonal Water “Pump” in the Atmosphere of Mars: Vertical Transport to the Thermosphere

Shaposhnikov

Medvedev

Rodin

et al. 2019

Geophysical Research Letters

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“…The cWASPAM (cooled Wasserdampf-und Spurengasmessungen in der Atmosphäre mit Mikrowellen) instrument (Hallgren and Hartogh, 2012) (Hartogh and Jarchow, 1995). The instrument was developed by the Max Planck Institute for Solar System Research (now located in Göttingen) and is characterized by high sensitivity.…”

Section: The Ground-based Microwave Radiometer Datasetsmentioning

confidence: 99%

The SPARC water vapor assessment II: intercomparison of satellite and ground-based microwave measurements

et al. 2017

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Abstract. As part of the second SPARC (Stratospheretroposphere Processes And their Role in Climate) water vapor assessment (WAVAS-II), we present measurements taken from or coincident with seven sites from which ground-based microwave instruments measure water vapor in the middle atmosphere. Six of the ground-based instruments are part of the Network for the Detection of Atmospheric Composition Change (NDACC) and provide datasets that can be used for drift and trend assessment. We compare measurements from these ground-based instruments with satellite datasets that have provided retrievals of water vapor in the lower mesosphere over extended periods since 1996.We first compare biases between the satellite and groundbased instruments from the upper stratosphere to the upper mesosphere. We then show a number of time series comparisons at 0.46 hPa, a level that is sensitive to changes in H 2 O and CH 4 entering the stratosphere but, because almost all CH 4 has been oxidized, is relatively insensitive to dynamical variations. Interannual variations and drifts are investigated with respect to both the Aura Microwave Limb Sounder (MLS; from 2004 onwards) and each instrument's climatological mean. We find that the variation in the interannual difference in the mean H 2 O measured by any two instruments is typically ∼ 1%. Most of the datasets start in or after 2004 and show annual increases in H 2 O of 0-1 % yr −1 . In particular, MLS shows a trend of between 0.5 % yr −1 and 0.7 % yr −1 at the comparison sites. However, the two longest measurement datasets used here, with measurements back to 1996, show much smaller trends of +0.1 % yr −1 (at Mauna Loa, Hawaii) and −0.1 % yr −1 (at Lauder, New Zealand).

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“…Ground-based microwave radiometry is a well-established remote sensing technique and has been used to study atmospheric phenomena such as sudden stratospheric warmings (e.g., Seele and Hartogh, 2000;Flury et al, 2009;Scheiben et al, 2012) and atmospheric tides (e.g., Haefele et al, 2008;Hallgren and Hartogh, 2012;Scheiben et al, 2013). Further, ground-based microwave radiometers are appropriate for calibration and validation of satellites and for monitoring of long-term trends of atmospheric composition (e.g., Nedoluha et al, 2003;Hartogh et al, 2011). To characterize the locally observed waves at the measurement locations on a global scale, satellite data from the Microwave Limb Sounder (MLS) on the Aura satellite are used.…”

Section: Published By Copernicusmentioning

confidence: 99%

The quasi 16-day wave in mesospheric water vapor during boreal winter 2011/2012

Scheiben¹,

Tschanz²,

Hocke³

et al. 2013

Preprint

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Abstract. This study investigates the characteristics of the quasi 16-day wave in the mesosphere during boreal winter 2011/2012 using observations of water vapor from ground-based microwave radiometers and satellite data. The ground-based microwave radiometers are located in Seoul (South Korea, 37° N), Bern (Switzerland, 47° N) and Sodankylä (Finland, 67° N). The quasi 16-day wave is observed in the mesosphere at all three locations, while the dominant period increases with latitude from 15 days at Seoul to 20 days at Sodankylä. The observed evolution of the quasi 16-day wave confirms that the wave activity is strongly decreased during a sudden stratospheric warming that occurred in mid-January 2012. Using satellite data from the Microwave Limb Sounder on the Aura satellite, we examine the zonal characteristics of the quasi 16-day wave and conclude that the observed waves above the mid-latitudinal stations Seoul and Bern are eastward-propagating s=−1 planetary waves with periods of 15 to 16 days, while the observed oscillation above the polar station Sodankylä is a standing oscillation with a period of approximately 20 days. The strongest relative wave amplitudes in water vapor during the investigated time period are approximately 15%. The wave activity varies strongly along a latitude circle. The activity of the quasi 16-day wave in mesospheric water vapor during boreal winter 2011/2012 is strongest over Northern Europe, the North Atlantic ocean and North-West Canada. The region of highest wave activity seems to be related to the position of the polar vortex. We conclude that the classic approach to characterize planetary waves zonally averaged along a latitude circle is not sufficient to explain the local observations because of the strong longitudinal dependence of the wave activity.

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First detection of tidal behaviour in polar mesospheric water vapour by ground based microwave spectroscopy

Cited by 13 publications

References 34 publications

Seasonal Water “Pump” in the Atmosphere of Mars: Vertical Transport to the Thermosphere

Seasonal Water “Pump” in the Atmosphere of Mars: Vertical Transport to the Thermosphere

The SPARC water vapor assessment II: intercomparison of satellite and ground-based microwave measurements

The quasi 16-day wave in mesospheric water vapor during boreal winter 2011/2012

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