SSiRC data rescue of stratospheric aerosol measurements

Lead: Juan-Carlos Antuña-Marrero, Univ. of Valladolid, Spain; Graham Mann, Univ. Leeds, U.K.

Measuring in-situ the stratospheric aerosol layer became an urgent priority in the 1950s to monitor the progression of radionuclide concentrations from thermonuclear tests in the Pacific and mid-latitudes (e.g. Telegadas and List, 1964), due to the potential biological hazard from fallout of long-lived fission products such as strontium-90 transported within aerosol particles (e.g. Martell, 1966).

Landmark papers analyzing aerosol measurements from high-altitude balloon (Junge et al., 1961) and aircraft (Junge and Manson, 1961), established much of today's understanding of the vertical distribution of stratospheric aerosols (e.g. Junge, 1961; Friend, 1966). The major volcanic aerosol cloud from the tropical 1963 Agung eruption was also measured from in-situ (Mossop, 1964; Rosen, 1964; 1968) and active remote sensing instruments (Elterman et al., 1969; Grams & Fiocco, 1967)

These measurements provide invaluable information on the 1960s stratospheric aerosol layer and, crucially for climate models, new constraints for the vertical extent and longevity of the Agung aerosol cloud. However, in this early period, the majority of these measurements are only available in journal papers and project reports, and although there is extensive documentation of the datasets, these have not yet been gathered together for the scientific community. In this new SSiRC data rescue activity we will provide information and links to these observations and establish guidance documents to enable them to be interpreted consistently with today's stratospheric aerosol measurements and link to the more recent observational data record. We aim to stimulate new research to add new scientific knowledge of the stratospheric aerosol layer and volcanic radiative effects during this key baseline period.

We seek to foster new collaborations between scientists to recover, re-digitize and re-calibrate other historic stratospheric aerosol data sets, and invite scientists to contribute to this activity and to provide advice and expertise on how best to recover other incomplete long term observations of stratospheric composition,

Rather than providing a new data archive for historic data sets we suggest that these measurements are to be hosted by an existing data center such as the PANGAEA data publisher for Earth and Environmental Datasets The SSiRC data rescue webpage will then provide sign-post information on where to find the pre-satellite stratospheric aerosol measurement data sets in existing archives, publications and reports.

The initial focus of the data rescue initiative is on the 1950s/1960s stratospheric aerosol measurements from lidars, particle counters and searchlight observations. The data sources from most of these observations have already been archived within reports or PhD theses, some fully tabulated. In some cases however, the only sources may be Figures included in reports, journal papers and other documents, in which case these will be digitized and recovered. A key step of the SSiRC data rescue initiative will involve registering each data set with a DOI (Digital Object Identifier) to publish the data set in an open access data repository.

Here we provide an initial list of stratospheric aerosol datasets the SSiRC data rescue activity will focus on, and provide links to existing documentation and references. For the Minneapolis balloon measurements, the PI (James Rosen) has already produced a detailed description document and the data are already available on the Network for Detection of Atmospheric Composition and Change (NDACC) archive. The activity will involve consulting with each PI, and providing links to documentation that will similarly describe each of the data sets. Where data is re-digitized from publications we will also clearly describe the methodology used. An extra focus of the initial SSiRC data rescue is to gather datasets to characterize the progression of the aerosol cloud during the initial months after the 1991 Pinatubo eruption and we include an initial section on these early post-Pinatubo period data sets. The datasets available are:

Details on 1950s/60s stratospheric aerosol measurements

Measuring in-situ the stratospheric composition became an urgent priority in the 1950s to monitor the progression of radionuclide concentrations from thermonuclear tests in the Pacific and in mid- latitudes (e.g. Telegadas and List, 1964). Existing US Air Force and Atomic Energy Commission high- altitude balloon-borne and U-2 aircraft monitoring capabilities began to measure aerosol in 1960 (e.g. Friend, 1961), and the program continued to 1966 (Feely et al., 1967). Christian Junge and co-workers analyzed stratospheric aerosol measurements from high-altitude balloon (Junge et al., 1961) and aircraft (Junge and Manson, 1961), establishing the basis of today's understanding of the vertical distribution of stratospheric aerosols (e.g. Junge, 1961; Friend, 1966).

Junge et al. (1961) analyzed balloon flights made in 1958 and 1959, measuring increasing concentrations of particles larger than 100nm, up to a maximum at 20km, the layer subsequently becoming known as the Junge layer. In contrast, smaller Aitken particles, measured by expansion- type nuclei counters decreased above the tropopause, up to 25km. These measurements combined existing aerosol measurement technologies (e.g. Junge, 1935) with new sampling methods (e.g. Chagnon, 1957) for stratospheric conditions.

The initial aerosol samples from U-2 flights (Mar-Nov 1960) spanned 63°S to 72°N (Junge and Manson, 1961), and established the dominant sulfate aerosol composition, with also trace metals including magnesium, silicon and iron with lower concentrations of calcium and potassium. The high-altitude sampling program of aircraft and balloon measurements continued through much of the 1960s (Feely et al., 1967). Instruments on the U-2 flights measured the volcanic aerosol cloud from the 1963 Agung eruption, including the morphology of volcanic aerosols (Mossop et al., 1963; 1964; 1965). Balloon-borne particle counters developed at the University of Minnesota (Rosen, 1964) measured the full vertical extent of the volcanic aerosol concentrations, and provided additional information on the meridional variation of the stratospheric aerosol layer. Several observational synthesis papers at the end of the 1960s brought together wide range of different data sets. For example Rosen (1969) analysed both in-situ and active remote sensing measurements to understand aerosol formation processes, and Dyer and Hicks (1968) present a comprehensive synthesis of ground-based radiation measurements, then leading to our current understanding of the dispersion of the Agung aerosol cloud (Dyer, 1970).

With the development of active ground-based remote sensing techniques in the early 1960's, the Agung plume was also measured by searchlight (Elterman, 1964) and lidar (Clemesha et al., 1966; Grams and Fiocco, 1967). Together with information documented in reports that were recovered from that time (e.g. Elterman, 1966; Feely et al., 1967) and PhD theses (e.g. Grams, 1966), these measurements provide information of the Northern Hemisphere altitude progression of the major volcanic aerosol cloud.

Further advances in particle counter technology in the 1970s (Kaselau 1974; Haberl, 1975; Rosen and Hofmann, 1977) led new knowledge of the existence of the Aitken-sized stratospheric aerosol (Rosen et al., 1975; Cadle & Kiang, 1977; Cadle et al., 1977). Together with the long term record of in-situ aerosol measurements from Wyoming (Hofmann et al., 1975) which span the 1974 Fuego period (e.g. Hofmann and Rosen, 1977), our understanding of volcanic effects progressed further.

A brief summary about the history of dustsondes can be found here.


Cadle, R. D. and G. W. Grams, (1975): Stratospheric aerosol particles and their optical properties, Reviews of Geophysics and Space Physics, vol. 13, no. 4, 475-501.
Cadle, R. D., Kiang, C. S. and LouIs, J.-F. et al. (1976): The global scale dispersion of the eruption clouds from major volcanic eruptions, J. Geophys. Res., vol. 81, no. 18, 3125-3132.
Cadle, R. D. and Kiang, C. S. (1977): Stratospheric Aitken Particles, Reviews of Geophysics and Space Physics, vol. 15, no. 2, 195-202.
Chagnon, C. W. (1957): Balloon-borne sampling apparatus, Instrumentation for Geophysical Research, no. 6, 20 pp. (ASTIA report no. 117270, AFCRC-TR-57-215)
Chagnon, C. W. and Junge, C. E. (1965): The size distribution of radioactive aerosols in the troposphere, J. App. Meteorol., vol. 4, 329-333.
Clemesha, B. R., Kent, G. S. and Wright, R. W. H. (1966): Laser-probing the lower atmosphere, Nature, vol. 209, 184-185.
Dyer, A. J. and Hicks, B. B. (1968): Global spread of volcanic dust from the Bali eruption of 1963, Q. J. Roy. Met. Soc., 94, 545-554.
Dyer, A. J. (1970): Anisotropic diffusion coefficients and the global spread of volcanic dust, J. Geophys. Res., vol. 75, no. 15, 3007-3012.
Elterman, L, (1951): The measurement of stratospheric density distribution with the searchlight technique, J. Geophys. Res., vol. 56, no. 4, 509-520.
Elterman, L. and Campbell, A. B. (1964): Atmospheric aerosol observations with searchlight profiling, Journal of the Atmospheric Sciences, vol. 21, 457-458.
Elterman, L. (1966): An atlas of aerosol attenuation and extinction profiles for the troposphere and stratosphere, US Air Force Cambridge Research Laboratories report, AFCRL, 66-828.
Elterman, L., Wexler, R and Chang, D. T. (1969): Features of Tropospheric and Stratospheric Dust, Applied Optics, vol. 8, no. 5, 893-903.
Farlow, N. H., Ferry, G. V., Lem, H. Y. and Hayes, D. M. (1979): Latitudinal variations of stratospheric aerosols, J. Geophys. Res. Oceans, vol. 84, no. C2, 733-743.
Feely, H. W., Katzman, D., Seitz, H., Davidson, B. and Friend, J. P. et al. (1967) Final report on Project Stardust (DASA 2166-1), vol. 1, chapters 1 to 6 (see section 5.2, from page 91).
Feely, H. W., Seitz, H., Lagomarsino, R. J. and Biscaye, P. E. (1966): Transport and fallout of stratospheric radioactive debris, Tellus, vol. 18, 316-328.
Friend, J. P. (1966): Properties of the stratospheric aerosol, Tellus, vol. 18, 465-473.
Grams, G. W. (1966): Optical radar studies of stratospheric aerosol (PhD thesis, MIT, May, 1966) Grams, G. W. and G. Fiocco (1967) Stratospheric aerosol layer during 1964 and 1965, J. Geophys. Res., vol. 72, no. 14, 3523-3542.
Haberl, J. B. (1975): Stratospheric Aitken nuclei counter, Rev. Sci. Instrum., Vol. 46, No.4, 443-447.
Hofmann, D. J., Rosen, J. M., Pepin, T. J. and Pinnick, R. G. (1975): Stratospheric aerosol measurements I: Time variations at Northern mid-latitudes, J. Atmos. Sci., vol. 32, 1446-1456.
Hofmann, D. J. and Rosen, J. M. (1977): Balloon observations of the time development of the stratospheric aerosol event of 1974-1975, J. Geophys. Res., vol. 82, no.9, 1435-1440.
Junge, C. E. (1935): Ubersattigungsmessungen an atmospherischen kondensationskernen, Gerlands Beitr. Geophys., 46, 108-129.
Junge, C. E. (1961): A world-wide stratospheric aerosol layer, Science, vol. 133, 1478-1479.
Junge, C. E., Chagnon, C. W. and J. E. Manson (1961): Stratospheric aerosols, J. Meteorol., vol. 18, 81-108.
Junge, C. E. and Manson, J. E. (1961): Stratospheric aerosol studies, J. Geophys. Res., vol. 66, no. 7, 2163-2182.
Kaselau, K. H., Fabian, P. and Roehrs, H. (1974) Measurements of aerosol concentration up to a height of 27 km, Pure and Applied Geoph., vol. 112, 877-885.
Martell, E. A. (1966): The size distribution and interaction of radioactive and natural aerosols in the stratosphere, Tellus, vol. 18, 486-498.
Mossop, S. C. (1963): Stratospheric particles at 20km, Nature, 199, 325-326.
Mossop, S. C. (1964): Volcanic dust collected at an altitude of 20km, Nature, 203, 824-827.
Mossop, S. C. (1965): Stratospheric particles at 20 km altitude, Geochimica et Cosmochimica Acta, vol. 29, 201-207.
Rosen, J. M., (1964): The Vertical Distribution of Dust to 30 Kilometers, J. Geophys. Res., 69 (21), 4673-4767.
Rosen, J. M. (1966): Correlation of dust and ozone in the stratosphere, Nature, 209, 1342.
Rosen, J. M. (1968): Simultaneous dust and ozone soundings over North and Central America, J. Geophys. Res., vol. 73, no. 2, 479-486.
Rosen, J. M. (1969): Stratospheric dust and its relationship to the meteoric influx, Space Science Reviews, vol. 9, 58-89.
Rosen, J. M., Hofmann, D. J. and Laby, J. (1975): Stratospheric aerosol measurements, II: The worldwide distribution, J. Atmos. Sci., vol. 32, 1457-1462.
Rosen, J. M. and Hofmann, D. J. (1977): Balloon-borne measurements of condensation nuclei, J. App. Meteorol., vol. 10, 56-62.
Telegadas, K. and List. R. J. (1964): Global history of the 1958 nuclear debris and its meteorological Implications, J. Geophys. Res., vol. 69, no. 22, 4741-4753.
Text below is example document from Jim Rosen for Minneapolis dust-sondes

From the 'sondes' section of the Network for Detection of Atmospheric Composition Change

Text below is example document from Jim Rosen for Minneapolis dust-sondes