Ozone and Radionuclide Correlations In Air of Marine Trajectory At Quillayute, Washington

Ludwick, J.D.; Fox, Traci B.; Wendell, L.L.

doi:10.1080/00022470.1976.10470284

Cited by 13 publications

(7 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several studies (Husain et al, I977;Ludwick et al, 1976;Reiter et al, 1976) have demonstrated the viability of using 7Be (t« = 53.28 days) as a natural radioactive tracer to identify upper atmospheric air at ground level. Elevated ozone concentrations are observed to correlate with periods of high 7Be activity.…”

Section: Introductionmentioning

confidence: 99%

Determination of stratospheric ozone at ground level using ⁷Be/ozone ratios

Dutkiewicz¹,

Husain²

1979

Geophysical Research Letters

View full text Add to dashboard Cite

The 7Be and O3 concentrations were measured and the 7Be/O3 ratios calculated for air particulates collected on several flights of two specially equipped commercial B747 jetliners between altitudes of 10 and 12 km and latitudes of 21° to 55° N. Upper tropospheric 7Be concentrations averaged about 520 pCi/10³m³, whereas the stratospheric average was about 4,700 pCi/10³m³. The 7Be/O3 ratio at 35° ‐ 42° N was determined to be 10.78 pCi/10³m³/ppbv for April‐June 1978. Concentrations of 7Be and O3 were also measured daily during June and July 1977 at Whiteface Mountain, New York. Daily variations in 7Be data indicated the arrival of a stratospheric air mass on June 15‐16. Comparison of 7Be concentrations show approximately a tenfold dilution of the stratospheric air during tropospheric descent. The 7Be/O3 ratio on June 15‐16 was 9.8 pCi/10³m³/ppbv within experimental error of the stratospheric value. This suggests that at least at times, stratospheric air, although diluted, reaches ground level without significant relative fractionation of 7Be and O3. Assuming this to be true on days when 7Be concentration is > 200 pCi/10³m³ (or ≥ 5% of the stratospheric value), we have determined the stratospheric ozone concentration at Whiteface Mountain to vary between 19 and 47 ppbv for summer months. Thus at a remote location such as Whiteface Mountain both stratospheric and the tropospheric sources play an important role.

show abstract

Section: Introductionmentioning

confidence: 99%

Determination of stratospheric ozone at ground level using ⁷Be/ozone ratios

Dutkiewicz¹,

Husain²

1979

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…Filter samples were initially analyzed for radioactive 7Be concentration by using a Ge(Li) detector and a multichannel pulse height analyser. Beryllium 7 is produced by cosmic-ray bombardment of stratospheric nitrogen and oxygen [Lai and Peters, 1967], and its concentration can be used as a natural tracer of stratospheric air [Husain et al, 1977, Ludwick et al, 1976.…”

Section: Introductionmentioning

confidence: 99%

Aircraft sampling of the sulfate layer near the tropopause following the eruption of Mount St. Helens

Lezberg¹,

Otterson²,

Roberts³

et al. 1982

J. Geophys. Res.

View full text Add to dashboard Cite

Twenty‐three filter sampling flights of the NASA Lewis F‐106 aircraft, were conducted in the Great Lakes region between June 4 and December 23, 1980, following the major eruption of Mount St. Helens (Washington State) on May 18. The IPC‐1478 filters were exposed over an altitude range spanning the local tropopause. A filter sample exposed above the tropopause on June 5 indicated a sulfate level of 50 times the baseline measurements, which is consistent with the trajectory predictions of the leading edge of the cloud on its second transit around the earth. Subsequent measurements over a period of 7 months revealed the existence of a layer of sulfate above the tropopause that decayed to a level of about 4 times previously measured background levels by the beginning of August. Concentration of nitrate above the tropopause exhibited considerable variability and showed some enhancement compared with previously measured concentration levels. On the basis of the null results of X ray fluorescence measurements, there is no evidence of ash particle concentrations >3.4 μm/m3 persisting in the layer above the tropopause following the second transit of the cloud.

show abstract

“…Data obtained in this laboratory (Husain et al, 1977) and elsewhere (Reiter et al, 1975(Reiter et al, , 1977Ludwick et al, 1976) have demonstrated that correlations between 'Be and ozone exist, suggesting that at least at times ozone originated in the stratosphere. However, a considerable amount of ozone is also produced by photochemical reactions at ground level.…”

Section: Introductionmentioning

confidence: 99%

Sources of ozone and sulfate in northeastern United States. Annual progress report. [Determination of anthropogenic sources from measurements at Whiteface Mountain, New York]

Husain¹,

Dutkiewicz²,

Coffey³

et al. 1978

View full text Add to dashboard Cite

Ozone and Radionuclide Correlations In Air of Marine Trajectory At Quillayute, Washington

Cited by 13 publications

References 10 publications

Determination of stratospheric ozone at ground level using ⁷Be/ozone ratios

Determination of stratospheric ozone at ground level using ⁷Be/ozone ratios

Aircraft sampling of the sulfate layer near the tropopause following the eruption of Mount St. Helens

Sources of ozone and sulfate in northeastern United States. Annual progress report. [Determination of anthropogenic sources from measurements at Whiteface Mountain, New York]

Contact Info

Product

Resources

About

Ozone and Radionuclide Correlations In Air of Marine Trajectory At Quillayute, Washington

Cited by 13 publications

References 10 publications

Determination of stratospheric ozone at ground level using 7Be/ozone ratios

Determination of stratospheric ozone at ground level using 7Be/ozone ratios

Aircraft sampling of the sulfate layer near the tropopause following the eruption of Mount St. Helens

Sources of ozone and sulfate in northeastern United States. Annual progress report. [Determination of anthropogenic sources from measurements at Whiteface Mountain, New York]

Contact Info

Product

Resources

About

Determination of stratospheric ozone at ground level using ⁷Be/ozone ratios

Determination of stratospheric ozone at ground level using ⁷Be/ozone ratios