Ozone in the marine boundary layer of Bay of Bengal during post-winter period: Spatial pattern and role of meteorology

Nair, Prabha R.; David, Liji M.; Girach, Imran A.; George, K. Susan

doi:10.1016/j.atmosenv.2011.05.040

Cited by 32 publications

(26 citation statements)

References 42 publications

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“…At night, vertical mixing of free tropospheric air with the marine boundary layer (MBL) lead to the higher ozone mixing ratio (Bremaud et al, 1998). Similar diurnal variation has been observed in the Pacific, Indian Ocean region and over the BoB earlier (Johnson et al, 1990;Nair et al, 2011). From Fig.…”

Section: Noon/afternoon Decrease With Nighttime Highsupporting

confidence: 54%

Distribution of ozone and its precursors over Bay of Bengal during winter 2009: role of meteorology

2011

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Abstract. Measurements of ozone and NO 2 were carried out in the marine environment of the Bay of Bengal (BoB) during the winter months, December 2008-January 2009, as part of the second Integrated Campaign for Aerosols, gases and Radiation Budget conducted under the Geosphere Biosphere Programme of the Indian Space Research Organization. The ozone mixing ratio was found to be high in the head and the southeast BoB with a mean value of 61 ± 7 ppb and 53 ± 6 ppb, respectively. The mixing ratios of NO 2 and CO were also relatively high in these regions. The spatial patterns were examined in the light of airflow patterns, air mass back trajectories and other meteorological conditions and satellite retrieved maps of tropospheric ozone, NO 2 , CO, and fire count in and around the region. The distribution of these gases was strongly associated with the transport from the adjoining land mass. The anthropogenic activities and forest fires/biomass burning over the Indo Gangetic Plains and other East Asian regions contribute to ozone and its precursors over the BoB. Similarity in the spatial pattern suggests that their source regions could be more or less the same. Most of the diurnal patterns showed decrease of the ozone mixing ratio during noon/afternoon followed by a nighttime increase and a morning high. Over this oceanic region, photochemical production of ozone involving NO 2 was not very active. Water vapour played a major role in controlling the variation of ozone. An attempt is made to simulate ozone level over the north and south BoB using the photochemical box model (NCAR-MM). The present observed features were compared with those measured during the earlier cruises conducted in different seasons.

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Section: Noon/afternoon Decrease With Nighttime Highsupporting

confidence: 54%

Distribution of ozone and its precursors over Bay of Bengal during winter 2009: role of meteorology

2011

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“…In the 0-4 km layer, water vapour acts as a source of OH radicals and depletes ozone. Compared to the photochemical production, this depletion process dominates (Nair et al, 2011). Thus, a net outflow of ozone in chemistry was observed.…”

Section: Local Chemistrymentioning

confidence: 95%

“…For instance, the biomass burning plume originating from southern Africa in boreal autumn in the Southern Hemisphere can be observed as well for CO as for ozone. However, in comparison to ozone, which is produced due to the photochemical production, the spatial pattern of CO is known to be more driven by emissions than dynamical processes (Logan et al, 2008). Thus, the time series of the data products for tropospheric CO reveals a similar winter maximum as NO 2 , and it also shows a smaller peak in spring time as TOC.…”

Section: Data Sets Used In This Studymentioning

confidence: 97%

“…In cloud-free conditions, the nadir vertical profiles have around four degrees of freedom (DOF) for signal, approximately two of which are in the troposphere, giving an estimated vertical resolution of about 6 km with a footprint of 5.3 km × 8.5 km, covering an altitude range of 0-33 km (see Beer et al, 2001;Nassar et al, 2008 and the references therein).…”

Section: Data Sets Used In This Studymentioning

confidence: 99%

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Tropospheric ozone maxima observed over the Arabian Sea during the pre-monsoon

Jia¹,

Ladstätter-Weißenmayer²,

Hou

et al. 2017

Atmos. Chem. Phys.

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Abstract. An enhancement of the tropospheric ozone column (TOC) over Arabian Sea (AS) during the pre-monsoon season is reported in this study. The potential sources of the AS spring ozone pool are investigated by use of multiple data sets (e.g., SCIAMACHY Limb-Nadir-Matching TOC, OMI/MLS TOC, TES TOC, MACC reanalysis data, MOZART-4 model and HYSPLIT model). Three-quarters of the enhanced ozone concentrations are attributed to the 0-8 km height range. The main source of the ozone enhancement is considered to be caused by long-range transport of ozone pollutants from India ( ∼ 50 % contributions to the lowest 4 km, ∼ 20 % contributions to the 4-8 km height range), the Middle East, Africa and Europe (∼ 30 % in total). In addition, the vertical pollution accumulation in the lower troposphere, especially at 4-8 km, was found to be important for the AS spring ozone pool formation. Local photochemistry, on the other hand, plays a negligible role in producing ozone at the 4-8 km height range. In the 0-4 km height range, ozone is quickly removed by wet deposition. The AS spring TOC maxima are influenced by the dynamical variations caused by the sea surface temperature (SST) anomaly during the El Niño period in 2005 and 2010 with a ∼ 5 DU decrease.

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“…This value was similar to those recorded on clearsky days (May 2, May 22, and June 29 in 1998) observed at Dungsha Island (20°42′N, 116°43′E) (Lin et al, 2002) during the SCS monsoon experiment (May-June 1998). In addition, numerous studies have reported that the O 3 mixing ratio exhibits a positive correlation with T a and a negative correlation with relative humidity (RH) Nair et al, 2011;Toh et al, 2013). A high O 3 mixing ratio is related to extreme SW, less precipitation, low WS and low RH (Pulikesi et al, 2006).…”

Section: Shipboard Site Descriptionmentioning

confidence: 99%

Distribution of Ozone and Related Compounds in the Marine Boundary Layer of the Northern South China Sea in 2010

Lan

Tsuang

Lin³

et al. 2015

Aerosol Air Qual. Res.

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To investigate the characteristics of air pollutants transported from the Asian continental regions to the marine boundary layer of the northern South China Sea (SCS), we recorded the continuous measurements of meteorology, sea surface radiative budget, and ozone (O 3 ) and related compounds in the marine boundary layer near Taiwan during 2010 cruises. For the marine field campaign investigation, the contaminated O 3 and related compounds (e.g., NO 2 , NO, CO, CH 4 , and NMHC) have been eliminated from research vessel's exhaust by using various meteorological factors. The mean values of O 3 and its major precursors (NO 2 , NO, and CO) were 25 ± 9.9, 3.2 ± 1.8, 2.9 ± 1.7, and 204 ± 54 ppb, respectively. A high O 3 mixing ratio is related to extreme shortwave radiation, high air temperature, less precipitation, and low wind speed and specific humidity. The results indicated a higher ∆O 3 /∆CO ratio of 0.2 at sunset during the March 2010 cruise mainly due to a long-range transport of aged plumes (> 3 days) originating from the super-region of Asian continent and a lower ∆O 3 /∆CO ratio of 0.12 at midday, mostly associated with the proximity to local sources of fresh plumes (< 2 days) during April 2010 and July 2010 cruises. The O 3 and related compounds mixing ratios over the ocean are affected by emission source, Asian monsoon, wind speed, gas deposition, gas solubility, the chemical enhancement factor, the frontal inversion and the boundary layer height. A clear bulge in the diurnal cycle was observed between early morning and late afternoon for NO x , CO, and O 3 . Moreover, 5-d backward trajectories and Southeast Asia surface wind fields suggested that the southward export of the air masses in spring originated from Mongolia and the East Asian continent.

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Ozone in the marine boundary layer of Bay of Bengal during post-winter period: Spatial pattern and role of meteorology

Cited by 32 publications

References 42 publications

Distribution of ozone and its precursors over Bay of Bengal during winter 2009: role of meteorology

Distribution of ozone and its precursors over Bay of Bengal during winter 2009: role of meteorology

Tropospheric ozone maxima observed over the Arabian Sea during the pre-monsoon

Distribution of Ozone and Related Compounds in the Marine Boundary Layer of the Northern South China Sea in 2010

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