Balloon-borne limb measurements of the diurnal variation of UV/vis absorbing radicals – a case study on NO2 and O3

L. Kritten, A. Butz, M. Dorf, T. Deutschmann, S. Kühl, C. Prados-Roman, J. Puķīte, A. Rozanov, R. Schofield, K. Pfeilsticker
2010 Atmospheric Measurement Techniques Discussions  
A new "Bayesian" minimization algorithm for the retrieval of the diurnal variation of UV/vis absorbing radicals (O 3 , NO 2 , BrO, OClO and HONO) from balloon-borne limb scattered skylight observations is discussed. The method evaluates spectroscopic measurements in combination with radiative transfer calculations to drive a mathemat-5 ical inversion on a discrete time and height grid. Here, the proposed method is applied to data obtained during two deployments of the mini-DOAS instrument on
more » ... AS instrument on different balloon payloads in northern Brazil in June 2005. The retrieval is tested by comparing the inferred profiles to in-situ ozone sounding data and to measurements of the ENVISAT/SCIAMACHY satellite instrument performed during a collocated overpass. 10 The comparison demonstrates the strength and validity of our approach. In particular for time-varying radical concentrations, photochemical corrections due to temporal mismatch of the corresponding observations are rendered dispensable. Thus, limb scanning UV/vis spectrometry from balloon platforms offers a more direct and concise approach for satellite validation of radical measurements than solar occultation mea-15 surements. Furthermore, monitoring of the diurnal variation of stratospheric radicals allows us to constrain photochemical parameters which are critical for stratospheric ozone chemistry, such as the photolysis frequency of N 2 O 5 by observations of the diurnal variation of NO 2 . 25 UV/visible over the near-IR and mid-IR into the microwave. Accordingly, a variety of 432 AMTD 3, 431-468, 2010 Abstract AMTD 3, 431-468, 2010 Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion description of the concentration profile retrieval including radiative transfer modelling and inversion through an optimal estimation method (Rodgers, 2000) . Further, the profile retrieval is characterized by means of resolution in altitude and time. The information content and errors due to noise or unstable pointing are estimated. Section 3 reports on the validation of our approach for gases of (a) small diurnal variation such as 5 O 3 and (b) large diurnal variation such as NO 2 , by comparing our trace gas retrievals to (a) an O 3 profile measured by an ozone sonde, and (b) NO 2 profiles measured by the SCIAMACHY instrument abord the ENVISAT satellite during a colocated overpass. Concluding remarks are given in Sect. 4. Abstract AMTD 3, 431-468, 2010 Abstract AMTD 3, 431-468, 2010 Abstract AMTD 3, 431-468, 2010 Abstract 3, 431-468, 2010 Abstract AMTD 3, 431-468, 2010 Abstract 3, 431-468, 2010 Abstract 3, 431-468, 2010 Abstract AMTD 3, 431-468, 2010 Abstract AMTD 3, 431-468, 2010 Abstract 3, 431-468, 2010 Abstract 3, 431-468, 2010 Abstract 25 453 AMTD 3, 431-468, 2010 Pesquisas Espaciais, Brazil) for providing ballooning operations and for setting up the necessary infrastructure. We are grateful to Karla Longo and Saulo R. Freitas (INPE) for assistance given to balloon launches at Timon, Brazil. We thank Pierre Chadoutaud and Alice Belot for providing the ozone sonde data. Thanks to Guido Maucher from MIPAS-B team for allocating the attitude control parameters of the MIPAS-B flight. Thanks to C. Kern for proofreading the 10 manuscript with regard to the English. 25 445-451, 1995. 450 Bussemer, M.: Der Ring-Effekt: Ursachen und Einfluß auf die spektroskopische Messung stratosphärischer Spurenstoffe, Diploma thesis, Abstract 3, 431-468, 2010 Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion . Left panel: Concentration profile of O 3 retrieved from mini-DOAS measurements (black) aboard the -B payload on June 14, 2005 and from an in-situ sonde (red) in the vicinity of the balloon flight, hed with the averaging kernels of the mini-DOAS retrieval (green). Right panel: Averaging kernels mini-DOAS retrieval of O 3 . Different colours denote different EA. Fig. 7. Left panel: Concentration profile of O 3 retrieved from mini-DOAS measurements (black) aboard the MIPAS-B payload on 14 June 2005 and from an in-situ sonde (red) in the vicinity of the balloon flight, smoothed with the averaging kernels of the mini-DOAS retrieval (green). Right panel: Averaging kernels of the mini-DOAS retrieval of O 3 . Different colours denote different EA. 465 AMTD 3, 431-468, 2010
doi:10.5194/amtd-3-431-2010 fatcat:6cramzorxfd6plooa4sp3zcjay