Variations in surface ozone and NOx at Kannur: a tropical, coastal site in India

2012 ◽  
Vol 69 (2) ◽  
pp. 101-126 ◽  
Author(s):  
T. Nishanth ◽  
M. K. Satheesh Kumar ◽  
K. T. Valsaraj
Keyword(s):  
Surface Ozone ◽  
Coastal Site

Surface ozone measurements at urban coastal site Chennai, in India

2006 ◽  
Vol 137 (3) ◽  
pp. 1554-1559 ◽  
Author(s):  
M. Pulikesi ◽  
P. Baskaralingam ◽  
V.N. Rayudu ◽  
D. Elango ◽  
V. Ramamurthi ◽  
...  
Keyword(s):  
Surface Ozone ◽  
Coastal Site

Temporal variations in surface ozone at Thumba (8.6°N, 77°E)-a tropical coastal site in India

2002 ◽  
Vol 36 (4) ◽  
pp. 603-610 ◽  
Author(s):  
P.R Nair ◽  
D Chand ◽  
S Lal ◽  
K.S Modh ◽  
M Naja ◽  
...  
Keyword(s):  
Surface Ozone ◽  
Temporal Variations ◽  
Coastal Site

Analysis of the Surface Ozone During Summer and Autumn at a Coastal Site in East China

2010 ◽  
Vol 85 (1) ◽  
pp. 10-14 ◽  
Author(s):  
Yongquan Yin ◽  
Wenpo Shan ◽  
Xia Ji ◽  
Xingyan Deng ◽  
Jian’an Cheng ◽  
...  
Keyword(s):  
Surface Ozone ◽  
East China ◽  
Coastal Site

scholarly journals Long-Term Variations of Air Quality Influenced by Surface Ozone in a Coastal Site in India: Association with Synoptic Meteorological Conditions with Model Simulations

Atmosphere ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 193 ◽  
Author(s):  
Resmi C T ◽  
Nishanth T ◽  
Satheesh Kumar M K ◽  
Balachandramohan M ◽  
Valsaraj K T
Keyword(s):  
Air Quality ◽  
Surface Ozone ◽  
Atmospheric Temperature ◽  
Night Time ◽  
Coastal Site ◽  
Model Study ◽  
Different Seasons ◽  
Surface O3 ◽  
Good Agreement

Atmospheric ozone (O3) in the surface level plays a central role in determining air quality and atmospheric oxidizing capacity. In this paper, we review our comprehensive results of simultaneous measurements of surface ozone (O3) and its precursor gas (NOx) and weather parameters that were carried out continuously for a span of six years (January 2013–December 2018) at a typical rural coastal site, Kannur (11.9° N, 75.4° E) in South India. Surface O3 concentration reached its maximum during daytime hours and minimum during the night time. The influence of solar radiation and water content on variations of O3 are discussed. A Multi-Layer Perceptron (MLP) artificial neural network technique has been used to understand the effect of atmospheric temperature on the increase in O3 over the past six years. This has been found that temperature has been a major contributor to the increase in O3 levels over the years. The National Centre for Atmospheric Research- Master Mechanism (NCAR-MM) Photochemical box model study was conducted to validate the variations of O3 in different seasons and years, and the results were shown to be in good agreement with observed trends.

scholarly journals Inter-annual variability of surface ozone at coastal (Dumont d’Urville, 2004–2014) and inland (Concordia, 2007–2014) sites in East Antarctica

2016 ◽  
Author(s):  
M. Legrand ◽  
S. Preunkert ◽  
J. Savarino ◽  
M. M. Frey ◽  
A. Kukui ◽  
...  
Keyword(s):  
Surface Ozone ◽  
Ozone Layer ◽  
Weddell Sea ◽  
East Antarctica ◽  
Late Winter ◽  
South Pole ◽  
The South ◽  
Coastal Site ◽  
Antarctic Plateau ◽  
The Impact

Abstract. Surface ozone has been measured since 2004 at the coastal East Antarctic site of Dumont d'Urville (DDU) and since 2007 at the Concordia station located on the high East Antarctic plateau. This paper discusses long-term trends, seasonal and diurnal cycles, as well as inter-annual summer variability observed at these two East Antarctic sites. At Concordia, near surface ozone data were complemented by balloon soundings and compared to similar measurements done at the South Pole. The DDU record is compared to those obtained at the coastal site of Syowa also located in East Antarctica, as well as the coastal sites of Neumayer and Halley, both located at the coast of the Weddell Sea in West Antarctica. Surface ozone mixing ratios exhibit very similar seasonal cycle at Concordia and the South Pole. However, in summer the diurnal cycle and the vertical distribution of ozone above the snow surface are different at the two sites with a drop of ozone in the afternoon at Concordia and not at the South Pole, and a far well-mixed rich ozone layer within the lower 250 m at Concordia than at the South Pole during sunlight hours. These differences are related to different solar radiation and wind regimes encountered at these two inland sites. DDU appears to be the coastal site where the impact of the late winter/spring bromine chemistry is the weakest, but where the impact of NOx snow emissions from the high Antarctic plateau is the highest. The highest impact of the bromine chemistry is seen at Halley and Neumayer, and to a lesser extent at Syowa. These three sites are only weakly impacted by the NOx chemistry and the net ozone production occurring on the high Antarctic plateau. The differences in late winter/spring are attributed to the abundance of sea-ice offshore the sites whereas those in summer are related to the topography of East Antarctica that promotes the katabatic flow bringing oxidant-rich inland air masses to the site. There appears to be a decreasing trend in summer at the two East Antarctic sites of Concordia and DDU over the most recent period (2004/2007–2014). Further researches including continuing monitoring are needed at these two sites to better separate effect of synoptic transport from possible change of NOx snow emissions in response to change of the stratospheric ozone layer.

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