Variability of the nighttime OH layer and mesospheric ozone at high latitudes during northern winter: influence of meteorology

Damiani, Alessandro; Storini, M.; Santee, M. L.; Wang, S.

doi:10.5194/acp-10-10291-2010

Cited by 39 publications

(46 citation statements)

References 46 publications

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“…The absence of strong temperature increases and associated reversals of the zonal winds indicates that the NH winter of 2004/05 was without major sudden stratospheric warmings (e.g., Chshyolkova et al, 2007;Xu et al, 2009;Damiani et al, 2010b). However, the winter of 2004/05 was particularly cold and dynamically active, especially in the lower stratosphere WMO, 2007;El Amraoui et al, 2008).…”

Section: Meteorological Conditionsmentioning

confidence: 99%

“…The ClONO 2 data versions used here are V4O CLONO2 100 (UTLS mode) and V4O CLONO2 201 The SPE-induced changes of HCl were more than 0.2 ppbv at 1.5 hPa, but even larger HCl decrease took place in February 2006February , 2009February and 2010 corresponding to periods with strong winter polar vortices in the upper stratosphere following intense stratospheric sudden warming (SSW) events that occurred in January of those years (e.g., Siskind et al, 2007;Manney et al, 2009;Damiani et al, 2010b). Further HCl changes (enhancements) occurred during some SSW events (see for example the HCl peak at 2 hPa in late February 2008 in the upper-left panel of Fig.…”

Section: Mipasmentioning

confidence: 99%

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Impact of January 2005 solar proton events on chlorine species

et al. 2012

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Abstract. Sudden changes in stratospheric chlorine species in the polar northern atmosphere, caused by the Solar Proton Events (SPEs) of 17 and 20 January 2005, have been investigated and compared with version 4 of the Whole Atmosphere Community Climate Model (WACCM4). We used Aura Microwave Limb Sounder (MLS) measurements to monitor the variability of ClO, HCl, HOCl and Michelson Interferometer for Passive Atmospheric Sounder (MIPAS) on ENVISAT to retrieve ClONO 2 . SPE-induced chlorine activation has been identified. HCl decrease occurred at nearly all the investigated altitudes (i.e., 10-0.5 hPa) with the strongest decrease (of about 0.25 ppbv) on 21 January. HOCl was found to be the main active chlorine species under nighttime conditions (with increases of more than 0.2 ppbv) whereas both HOCl and ClO enhancements (about 0.1 ppbv) have been observed at the polar night terminator. Further, small ClO decreases (of less than 0.1 ppbv) and ClONO 2 enhancements (about 0.2 ppbv) have been observed at higher latitudes (i.e., at nighttime) roughly above 2 hPa.While WACCM4 reproduces most of the SPE-induced variability in the chlorine species fairly well, in some particular regions discrepancies between the modeled and measured temporal evolution of the abundances of chlorine species were found. HOCl changes are modelled very well with respect to both magnitude and geographic distribution. ClO decreases are reproduced at high latitudes, whereas ClO enhancements in the terminator region are underestimated and attributed to background variations. WACCM4 also reproduces the HCl depletion in the mesosphere but it does not show the observed decrease below about 2 hPa. Finally, WACCM4 simulations indicate that the observed ClONO 2 increase is dominated by background variability, although SPE-induced production might contribute by 0.1 ppbv.

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Section: Meteorological Conditionsmentioning

confidence: 99%

Section: Mipasmentioning

confidence: 99%

Impact of January 2005 solar proton events on chlorine species

et al. 2012

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“…Changes in CO due to chemistry (chem) are small below approximately 70 km, but each scenario and year shows a sustained sink for CO during the winter in a layer at around 80 km altitude. The layer coincides with the location of a night-time layer of hydroxyl (OH) around 82 km altitude (Brinksma et al, 1998;Pickett et al, 2006;Damiani et al, 2010). OH is known as the dominant chemical sink for middle-atmospheric CO (Solomon et al, 1985 imity to the edge of the polar vortex.…”

Section: Trajectories During Arctic Wintermentioning

confidence: 99%

Assessing the ability to derive rates of polar middle-atmospheric descent using trace gas measurements from remote sensors

et al. 2018

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Abstract. We investigate the reliability of using trace gas measurements from remote sensing instruments to infer polar atmospheric descent rates during winter within 46-86 km altitude. Using output from the Specified Dynamics Whole Atmosphere Community Climate Model (SD-WACCM) between 2008 and 2014, tendencies of carbon monoxide (CO) volume mixing ratios (VMRs) are used to assess a common assumption of dominant vertical advection of tracers during polar winter. The results show that dynamical processes other than vertical advection are not negligible, meaning that the transport rates derived from trace gas measurements do not represent the mean descent of the atmosphere. The relative importance of vertical advection is lessened, and exceeded by other processes, during periods directly before and after a sudden stratospheric warming, mainly due to an increase in eddy transport. It was also found that CO chemistry cannot be ignored in the mesosphere due to the night-time layer of OH at approximately 80 km altitude. CO VMR profiles from the Kiruna Microwave Radiometer and the Microwave Limb Sounder were compared to SD-WACCM output, and show good agreement on daily and seasonal timescales. SD-WACCM CO profiles are combined with the CO tendencies to estimate errors involved in calculating the mean descent of the atmosphere from remote sensing measurements. The results indicate errors on the same scale as the calculated descent rates, and that the method is prone to a misinterpretation of the direction of air motion. The "true" rate of atmospheric descent is seen to be masked by processes, other than vertical advection, that affect CO. We suggest an alternative definition of the rate calculated using remote sensing measurements: not as the mean descent of the atmosphere, but as an effective rate of vertical transport for the trace gas under observation.

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“…Only one work is currently devoted to relationships between OH * peak altitude and meridional wind flow (Dyrland et al, 2010). In this research, an anti-correlation between OH * peak altitude and meridional wind flow at high latitude (78 • N) in winter (25 October-11 February) was found.…”

Section: Discussionmentioning

confidence: 72%

“…The impact of sudden stratospheric warming (SSW) on the OH * layer has been studied intensively in several recent works (Dyrland et al, 2010;Shepherd et al, 2010;Damiani et al, 2010;Gao et al, 2011). During SSW, the altitude of the layer rises by ∼ 5-7 km, and the number density is reduced by more than 50 %.…”

Section: Discussionmentioning

confidence: 99%