Cloud influence on ozone diurnal cycle in the marine boundary layer at Réunion Island

Bremaud, P. J.; Taupin, F. G.

doi:10.1016/s0169-8095(98)00052-0

Cited by 11 publications

(11 citation statements)

References 29 publications

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“…Similar diurnal variations in NO x and meteorological parameters were previously measured during the 2015 Forests-gAses-aeRosols-Clouds Exploratory (FARCE) campaign, which was also conducted at the Maïdo observatory and along the Maïdo mountain slopes [29]. At Bélouve, O3 concentrations during the night were lower than at Maïdo due to the lower altitude of the site [28], higher concentrations of NO, ozonolysis of terpenes, and surface deposition [55]. At 04:00 UT, O3 increases due to the influence of the boundary mixing layer and the beginning of photochemical production processes.…”

Section: Diurnal Variation In Voc Speciessupporting

confidence: 71%

“…The climate is tropical with wet and hot summers with a cyclonic season from November to March and, depending on the altitude, mild to cool winters from May to September. VOCs, NO x , O 3 , and SO 2 concentrations were measured at the end of the cyclonic season, and the temperatures observed during the campaign varied between 12 and 16 • C at the Maïdo observatory, 23 On the synoptic scale, under the influence of trade winds, air masses are mainly advected toward the northwest over the mountains of Reunion Island, known as the over-flow phenomenon [28][29][30]. The observatory is also influenced by local air circulation patterns with thermodynamic processes linked to upslope and downslope winds such as the catabatic-anabatic slope winds and sea-land breeze.…”

Section: Meteorological Conditions and Sampling Sitesmentioning

confidence: 99%

“…Then, the surface is heated by solar radiation, resulting in upward air masses advecting to the Maïdo observatory. These air masses are mostly within the marine boundary layer (MBL), which contains biogenically-or anthropogenically-emitted compounds [28]. In contrast, during the night, the observatory is mostly in the free troposphere, the surface cools, and air masses move downward [28][29][30][31].…”

Section: Meteorological Conditions and Sampling Sitesmentioning

confidence: 99%

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Analysis of Volatile Organic Compounds during the OCTAVE Campaign: Sources and Distributions of Formaldehyde on Reunion Island

et al. 2020

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The Oxygenated Compounds in the Tropical Atmosphere: Variability and Exchanges (OCTAVE) campaign aimed to improve the assessment of the budget and role of oxygenated volatile organic compounds (OVOCs) in tropical regions, and especially over oceans, relying on an integrated approach combining in situ measurements, satellite retrievals, and modeling. As part of OCTAVE, volatile organic compounds (VOCs) were measured using a comprehensive suite of instruments on Reunion Island (21.07° S, 55.38° E) from 7 March to 2 May 2018. VOCs were measured at a receptor site at the Maïdo observatory during the entire campaign and at two source sites: Le Port from 19 to 24 April 2018 (source of anthropogenic emissions) and Bélouve from 25 April to 2 May 2018 (source of biogenic emissions) within a mobile lab. The Maïdo observatory is a remote background site located at an altitude of 2200 m, whereas Bélouve is located in a tropical forest to the east of Maïdo and Le Port is an urban area located northwest of Maïdo. The major objective of this study was to understand the sources and distributions of atmospheric formaldehyde (HCHO) in the Maïdo observatory on Reunion Island. To address this objective, two different approaches were used to quantify and determine the main drivers of HCHO at Maïdo. First, a chemical-kinetics-based (CKB) calculation method was used to determine the sources and sinks (biogenic, anthropogenic/primary, or secondary) of HCHO at the Maïdo site. The CKB method shows that 9% of the formaldehyde formed from biogenic emissions and 89% of HCHO had an unknown source; that is, the sources cannot be explicitly described by this method. Next, a positive matrix factorization (PMF) model was applied to characterize the VOC source contributions at Maïdo. The PMF analysis including VOCs measured at the Maïdo observatory shows that the most robust solution was obtained with five factors: secondary biogenic accounting for 17%, primary anthropogenic/solvents (24%), primary biogenic (14%), primary anthropogenic/combustion (22%), and background (23%). The main contributions to formaldehyde sources as described by the PMF model are secondary biogenic (oxidation of biogenic VOCs with 37%) and background (32%). Some assumptions were necessary concerning the high percentage of unknown HCHO sources of the CKB calculation method such as the biogenic emission factor resulting in large discrepancies between the two methods.

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Section: Diurnal Variation In Voc Speciessupporting

confidence: 71%

Section: Meteorological Conditions and Sampling Sitesmentioning

confidence: 99%

Section: Meteorological Conditions and Sampling Sitesmentioning

confidence: 99%

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Analysis of Volatile Organic Compounds during the OCTAVE Campaign: Sources and Distributions of Formaldehyde on Reunion Island

et al. 2020

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“…They found that in a situation where ozone accumulates in clear sky conditions, as soon as cloud is formed, the tropospheric ozone estimate changes drastically; the net production decreases by a factor of 2 or more and depending on the NOx concentration and the pH values, can actually lead to chemical destruction. Bremaud and Taupin [13] investigated the influence of clouds on the diurnal cycle of ozone concentration in the Reunion Island marine boundary layer. They reported that the orographic cloud layer plays an important role in the chemistry of ozone through several ways.…”

Section: Introductionmentioning

confidence: 99%

Effect of cloud on atmospheric ozone formation over Hyderabad (17.27°N, 78.28°E), India

et al. 2011

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The paper presents the nature of variations of clouds and total ozone over Hyderabad (17.27 o N, 78.28 o E), India. The low-level cloud over Hyderabad has been noticed to occur for many days and nights, particularly in the months from June to September. The low level cloud occurrences were minimum in winter months. The effect of cloud occurrence on ozone concentration has been critically analyzed and explained. It has been observed that the concentration of ozone increased with the increase of cloud occurrence. The related possible chemical explanation for ozone production processes has been offered.

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“…They found that in a situation where ozone accumulates in clear sky conditions, as soon as cloud is formed, the tropospheric ozone estimate changes drastically; the net production decreases by a factor of 2 or more and depending on the NOx concentration and the pH values, can actually lead to chemical destruction. Bremaud and Taupin [9] investigated the influence of clouds on the diurnal cycle of ozone concentration in the Reunion Island marine boundary layer. They reported that the orographic cloud layer plays an important role in the chemistry of ozone through several ways.…”

Section: Introductionmentioning

confidence: 99%

Effect of cloud on atmospheric ozone formation over Kolkata (22°34′N, 88°24′E), India

Jana

Saha²,

Midya

2010

Indian J Phys

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The paper presents the nature of variations of clouds and total ozone over Kolkata (22 o 34 / N, 88 o 24 / E), India. The low-level cloud over Kolkata has been noticed to occur for many days and nights, particularly in the months from June to September. The low level cloud occurrences were minimum in winter months. The effect of cloud occurrence on ozone concentration has been critically analyzed and explained. It has been observed that the concentration of ozone increased with the increase of cloud occurrence. The related possible chemical explanation for ozone production processes has been offered.

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Cloud influence on ozone diurnal cycle in the marine boundary layer at Réunion Island

Cited by 11 publications

References 29 publications

Analysis of Volatile Organic Compounds during the OCTAVE Campaign: Sources and Distributions of Formaldehyde on Reunion Island

Analysis of Volatile Organic Compounds during the OCTAVE Campaign: Sources and Distributions of Formaldehyde on Reunion Island

Effect of cloud on atmospheric ozone formation over Hyderabad (17.27°N, 78.28°E), India

Effect of cloud on atmospheric ozone formation over Kolkata (22°34′N, 88°24′E), India

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