Accuracy of ozonesonde measurements in the troposphere

Reid, Steven; Vaughan, G.; Marsh, A. R. W.; Smit, H. G. J.

doi:10.1007/bf00053792

Cited by 42 publications

(30 citation statements)

References 5 publications

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“…Common, although not universally accepted, is the cell current reading 10 min after the ozone conditioning. Some research groups use a cell current reading just before the high ozone conditioning as suggested by Reid et al (1996) or a cell current reading shortly before launch.…”

Section: The Ecc Backgroundmentioning

confidence: 99%

“…Thus, some questions remain, whether the results shown here are also applicable to this ozone sonde type and to the CEPEX measurements. Reid et al (1996) used model 5A ozone sondes and the 1% full buffer solution in a comparison with a reference ozone analyzer. Their measurements document background measurements prior to cell conditioning (I bg1 = 0.05 µA), after ozone conditioning (I * bg2 = 0.1 µA), and before launch (I * bg2 = 0.01 µA).…”

Section: Ozone Observations During Cepexmentioning

confidence: 99%

“…Due to this sensitivity and the variations and changes in procedure and in solutions, trend analyses for tropical upper tropospheric ozone based on ozone sondes need to be evaluated with great care. Reid et al (1996) had conducted a similar study, but concluded that the intermediate pre-conditioning reading of the background current is most appropriate. However, they did not consider the overestimation of the 1% full buffer solution.…”

Section: Summary and Final Remarksmentioning

confidence: 99%

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Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere

Vömel

Diaz

2010

Atmos. Meas. Tech.

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Laboratory measurements of the Electrochemical Concentration Cell (ECC) ozone sonde cell current using ozone free air as well as defined amounts of ozone reveal that background current measurements during sonde preparation are neither constant as a function of time, nor constant as a function of ozone concentration. Using a background current, measured at a defined timed after exposure to high ozone may often overestimate the real background, leading to artificially low ozone concentrations in the upper tropical troposphere, and may frequently lead to operator dependent uncertainties. Based on these laboratory measurements an improved cell current to partial pressure conversion is proposed, which removes operator dependent variability in the background reading and possible artifacts in this measurement. Data from the Central Equatorial Pacific Experiment (CEPEX) have been reprocessed using the improved background treatment based on these laboratory measurements. In the reprocessed data set near-zero ozone events no longer occur. At Samoa, Fiji, Tahiti, and San Cristóbal, nearly all near-zero ozone concentrations occur in soundings with larger background currents. To a large extent, these events are no longer observed in the reprocessed data set using the improved background treatment

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Section: The Ecc Backgroundmentioning

confidence: 99%

Section: Ozone Observations During Cepexmentioning

confidence: 99%

Section: Summary and Final Remarksmentioning

confidence: 99%

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Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere

Vömel

Diaz

2010

Atmos. Meas. Tech.

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“…Following the recommendation of Reid et al (1996), a constant background current correction was applied to ozonesonde measurements throughout the troposphere, in preference to the standard pressure-varying correction. Ozonesonde profiles treated in this way were consistent with those from the Geophysica aircraft on corresponding flight days, within ∼5 ppbv (profiles not shown).…”

Section: Ozonesonde Instrumentationmentioning

confidence: 99%

Composition of the TTL over Darwin: local mixing or long-range transport?

et al. 2009

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Abstract. We present ozone and carbon monoxide measurements taken in Darwin, Australia, during the wet season of 2005/2006, to examine whether the composition of the Tropical Tropopause Layer (TTL) reflects that of the local boundary layer or is influenced more by advection from distant sources. We find that the latter predominates in the upper TTL, and is also the major influence in the lower TTL, except during an active monsoon phase. The day-to-day variability of ozone in the TTL is far greater than that in the lower troposphere, and correlates closely with air mass origin deduced from trajectory calculations based on standard ECMWF wind analyses. Although clear evidence of recent local uplift was found in carbon monoxide tracer measurements recorded inside convective anvils, no such signal was found out-of-cloud in the background TTL, where the measured variability correlated well with air mass origin deduced from back-trajectories. This study suggests that the composition of the TTL is ultimately determined by vertical mixing in certain "hot spot" regions of the tropics, with advection from these regions dominating the composition elsewhere.

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“…The term i b represents the blank current in an ECC, and is generally measured when an ECC is exposed to ozone-free air for a period of around 10 minutes. Many researchers have investigated the interference of a background current on the accuracy of an ECC ozonesonde (Thornton and Niazy, 1982;Barnes et al, 1985;Komhyr et al, 1995;Reid et al, 1996;Boyd et al, 1998;Smit et al, 2007;Vomel and Diaz, 2010). Pump sampling efficiencies can become important at low pressure environment (Johnson et al, 2002).…”

Section: Typical Data Processing Equationmentioning

confidence: 99%

New Data Processing Equation to Improve the Response Time of an Electrochemical Concentration Cell (ECC) Ozonesonde

Huang

Chen

Lai

et al. 2015

Aerosol Air Qual. Res.

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Ozone concentrations of an electrochemical concentration cell (ECC) ozonesonde determined using a data processing equation typically lag changes in the concentrations of ozone sampled into an ECC by 20-40 s. This work develops a new equation for determining ozone concentrations of an ECC ozonesonde so that the determined ozone concentrations can respond relatively quickly to changes in the concentrations of the ozone sampled into the ECC. The new equation is derived by examining the chemical reaction rates and transport limits of related species and electrons in an ECC. To demonstrate the power of the new equation, an ECC is exposed to prescribed variations of ozone concentrations. The variations of the ozone concentrations of an ECC that are determined using both the new and the old equations are compared to the prescribed ozone variations. The results demonstrate that the ozone concentrations that are determined using the new equation responds approximately 50% faster to the prescribed ozone variations than do those obtained using the old equation.

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Accuracy of ozonesonde measurements in the troposphere

Cited by 42 publications

References 5 publications

Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere

Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere

Composition of the TTL over Darwin: local mixing or long-range transport?

New Data Processing Equation to Improve the Response Time of an Electrochemical Concentration Cell (ECC) Ozonesonde

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