Balloon-borne measurements of NO2: can a comparison of remote techniques be made from the historic data?

Roscoe, H. K.

doi:10.1007/bf00053847

Cited by 9 publications

(5 citation statements)

References 29 publications

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“…This is considerably less than the variability shown in Figure 4 and therefore gives some confidence that the largest component in our estimates of the variability of other species is indeed due to real stratospheric variations. Notice that in recent balloon flights the variation of measured NO2 summarized by Roscoe (1987) is around 50% in the middle and upper stratosphere and is somewhat higher for NO. Figure 5 shows the mean profile and standard deviation of derived atomic oxygen.…”

Section: Resultsmentioning

confidence: 99%

Radical variability determined from LIMS and SAMS satellite data

Pyle

Závody

1988

J Atmos Chem

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Using satellite data, the variability of a large number of stratospheric trace constituents can be estimated. These constituents need not themselves be measured by the satellite; their concentrations can be derived using photochemical steady-state relationships. The global coverage provided by the satellite over a long time period means that, for example, monthly zonal mean profiles can be derived. This has been done for H, OH, HO2, H202, C1, CIO, HC1, HOCI, C1ONO2, NO and O. The standard deviation of these quantities is a measure of their variability. We argue that comparing theoretical variability estimates with measurements is a better test of a photochemical theory than simply the comparison of single modelled and observed profiles.

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Section: Resultsmentioning

confidence: 99%

Radical variability determined from LIMS and SAMS satellite data

Pyle

Závody

1988

J Atmos Chem

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“…The next question that should be addressed is: given the constraints on the data (times, locations and accuracy) is a valid comparison possible? Roscoe (1986) argues that instrument differences as large as those seen in NO2 measurements (factors of two) were obvious even from nonsimultaneous measurements. However, if differences less than 10-20% are sought then simultaneity becomes more important, as will be discussed below.…”

Section: Discussion Of Sampling Differencesmentioning

confidence: 99%

Intercomparison of NO column measurements during MAP/GLOBUS 1985

et al. 1988

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Column measurements of nitric oxide were made using several techniques during the MAP/GLOBUS campaign in France in September 1985. The data sets are nearly co-located and simultaneous, therefore allowing a valid intercomparison of the various measurement methods. The range of altitudes sampled differs from instrument to instrument. This complicates the comparison because the data sets are to some extent complementary. The NO distributions apparently vary significantly from day to day, and possibly over shorter timescales. Changes in dynamics may be responsible for these variations. The results from the instruments which measure in the infrared and the ultraviolet are self-consistent, and show good agreement with photochemical predictions. On 19 September, when the intercomparison was made, the profile measured by the in-situ chemiluminescent instrument differed significantly from the predicted profile, and the measured columns were generally higher.

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“…Therefore differences in the absorption parameters for NO 2 may account for any apparent discrepancies between those two data sets. NO 2 measurements made in the visible spectral region typically give larger amounts than those made in the infrared [Roscoe, 1986]. At least part of this discrepancy is because room temperature cross sections have historically been used for the visible region.…”

Section: Regression Lines Comparing Lauder Columns (Above 15 Km) Withmentioning

confidence: 99%

NO₂ observations at 45°S during the decreasing phase of solar cycle 21, from 1980 to 1987

Johnston¹,

McKenzie²

1989

J. Geophys. Res.

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Monthly averaged NO2 columns obtained at twilight at 45°S over the period December 1980 to August 1987 are presented. Improvements to the retrieval technique used previously are discussed. The slant columns presented typically range from 3 to 12 × 1016 cm−2 which, because of the geometry at twilight, are approximately 20 times greater than the vertical columns. In addition to the expected diurnal and seasonal variations, the data also show variations on longer time scales. The identification of any long‐term trends is masked by the effects of the El Chichón eruption, which was probably responsible for a decrease in the column of 1.5×1016 cm−2 in 1983. After allowing for this, there remains a small but significant long‐term trend. This trend may be due to a cooling in the stratosphere that has taken place over the observation period. Alternatively, there may be a correlation with solar activity. The observation period is too short to be able to establish a definite link, but the trend is consistent with a decrease of 0.5×1016 cm−2 in the NO2 column from solar maximum to solar minimum. The self‐consistency from year to year does not support the theory that the “Antarctic ozone hole” is caused by variations in solar activity which change the production of the nitrogen oxides responsible for the catalytic destruction of ozone. Both the El Chichón eruption and the long‐term trend discussed earlier produce additive rather than multiplicative effects, with similar column reductions occurring in the summer and winter as well as in the morning and evening measurements.

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Balloon-borne measurements of NO2: can a comparison of remote techniques be made from the historic data?

Cited by 9 publications

References 29 publications

Radical variability determined from LIMS and SAMS satellite data

Radical variability determined from LIMS and SAMS satellite data

Intercomparison of NO column measurements during MAP/GLOBUS 1985

NO₂ observations at 45°S during the decreasing phase of solar cycle 21, from 1980 to 1987

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Balloon-borne measurements of NO2: can a comparison of remote techniques be made from the historic data?

Cited by 9 publications

References 29 publications

Radical variability determined from LIMS and SAMS satellite data

Radical variability determined from LIMS and SAMS satellite data

Intercomparison of NO column measurements during MAP/GLOBUS 1985

NO2 observations at 45°S during the decreasing phase of solar cycle 21, from 1980 to 1987

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Product

Resources

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NO₂ observations at 45°S during the decreasing phase of solar cycle 21, from 1980 to 1987