Abstract. Accurate observations of atmospheric ozone (O3) are essential to monitor in detail the key role of O3 in the atmospheric chemistry. The present paper examines the performance of different O3 retrieval strategies from FTIR (Fourier Transform InfraRed) spectrometry by using the 20-year time series of the high-resolution solar spectra acquired from 1999 to 2018 at the subtropical Izaña Observatory (IZO, Spain) within NDACC (Network for the Detection of Atmospheric Composition Change). In particular, the effect of two of the most influential factors have been investigated: the spectral region used for O3 retrievals and inclusion of an atmospheric temperature profile fit. The theoretical and experimental quality assessments of the different FTIR O3 products (total column, TC, amounts and volume mixing ratio, VMR, profiles) provide consistent results. Combining an optimal selection of spectral O3 absorption lines and a simultaneous temperature retrieval results in superior FTIR O3 products, with a precision greater than 0.6–0.7 % for O3 TCs as compared to coincident NDACC Brewer observations used as reference. However, this improvement can be only achieved provided the FTIR spectrometer is properly characterised and stable over time. For unstable instruments, the temperature fit has been found to exhibit a strong negative influence on O3 retrievals by increasing the cross-interference between instrumental performance and temperature retrieval. This cross-interference becomes especially noticeable beyond the upper troposphere/lower stratosphere as documented theoretically, as well as experimentally by comparing FTIR O3 profiles to those measured using Electrochemical Concentration Cell (ECC) sondes within NDACC. Consequently, it should be taken into account for the reliable monitoring of O3 vertical distribution, especially on long-term timescales.

The Izaña Atmospheric Research Center (IARC) is part of the Department of Planning, Strategy and Business Development of the State Meteorological Agency of Spain (AEMET). AEMET is an Agency of the Spanish Ministry of Agriculture and Fisheries, Food and Environment also known as MAPAMA. Table 3.2. Izaña Atmospheric Observatory (IZO) measurement programme. Parameter Start date Present Instrument Data Frequency Greenhouse Gases and Carbon Cycle CO2 Jun 1984 NDIR Licor 7000 (Primary instrument) NDIR Licor 6252 (Secondary instrument) CRDS Picarro G2401 30ʺ 30ʺ 30ʺ CH4 Jul 1984 GC-FID Dani 3800 GC-FID Varian 3800 CRDS Picarro G2401 2 samples/hour 4 samples/hour 30ʺ N2O Jun 2007 GC-ECD Varian 3800 4 samples/hour SF6 Jun 2007 GC-ECD Varian 3800 4 samples/hour CO Jan 2008 GC-RGD Trace Analytical RGA-3 CRDS Picarro G2401 3 samples/hour 30ʺ * Meteorological data from Santa Cruz de Tenerife Meteorological Center headquarters, 1 km distant, are also available since 1922. The Ozonesonde LaboratoryAdvanced preparation of the Science Pump Corporation (SPC) ECC ozone sensor (Model ECC-6A), together with digital Vaisala RS92 radiosonde and digital interface, is performed at the Ozonesonde Lab at SCO. Expendables such as radiosondes, interfaces, ozonesondes, ozone solution chemicals, syringes, needles, protection gloves, and triple distilled water are stored in this lab.

No abstract

El propósito de esta guía es presentar las bases para el establecimiento de protocolos de control y prevención, para mitigar el impacto en la salud de la exposición a la contaminación del aire de origen volcánico, y su aplicación en el Observatorio Atmosférico de Izaña (OAI). La guía se ha desarrollado a partir del protocolo que se elaboró de urgencia en el OAI para dar una respuesta rápida a los posibles problemas asociados a los efectos de la erupción del volcán de La Palma en Septiembre de 2021 sobre el Observatorio, aportando una explicación motivada a los umbrales y acciones descritas en la misma, ya que no existía material en castellano que aglutinara dicha información. Para ello se han consultado guías internacionales publicadas principalmente por departamentos de salud de zonas habitualmente expuestas a este tipo de contaminación (Hawaii, Islandia, etc.), así como información de la “International Volcanic Health Hazard Network (IVHHN)” (Red Internacional de Riesgos Volcánicos para la Salud).

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