Planetary Boundary Layer height over the Indian subcontinent during extreme monsoon years

Patil, M. N.; Patil, S. D.; Waghmare, R.T.; Dharmaraj, T.

doi:10.1016/j.jastp.2012.10.011

Cited by 24 publications

(16 citation statements)

References 39 publications

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“…These two studies lay the groundwork for the global climatology of MD. Since then, the climatological characteristics of MD over regional (e.g., for the Swiss plateau by Coen et al, 2014; for the Indian sub-continent by Patil et al, 2013) or global scales have been investigated (von Engeln and Teixeira, 2013;Ao et al, 2012;Xie et al, 2011;Jordan et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Climatological study of the Boundary-layer air Stagnation Index for China and its relationship with air pollution

et al. 2018

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Abstract. The Air Stagnation Index (ASI) is a vital meteorological measure of the atmosphere's ability to dilute air pollutants. The original metric adopted by the US National Climatic Data Center (NCDC) is found to be not very suitable for China, because the decoupling between the upper and lower atmospheric layers results in a weak link between the near-surface air pollution and upper-air wind speed. Therefore, a new threshold for the ASI-Boundary-layer air Stagnation Index (BSI) is proposed, consisting of daily maximal ventilation in the atmospheric boundary layer, precipitation, and real latent instability. In the present study, the climatological features of the BSI are investigated. It shows that the spatial distribution of the BSI is similar to the ASI; that is, annual mean stagnations occur most often in the northwestern and southwestern basins, i.e., the Xinjiang and Sichuan basins (more than 180 days), and least over plateaus, i.e., the Qinghai-Tibet and Yunnan plateaus (less than 40 days). However, the seasonal cycle of the BSI is changed. Stagnation days under the new metric are observed to be maximal in winter and minimal in summer, which is positively correlated with the air pollution index (API) during 2000-2012. The correlations between the BSI and the concentration of fine particulate matter (PM 2.5 ) during January 2013 and November to December in 2015-2017 of Beijing are also investigated. It shows that the BSI matches the day-by-day variation of PM 2.5 concentration very well and is able to catch the haze episodes.

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Section: Introductionmentioning

confidence: 99%

Climatological study of the Boundary-layer air Stagnation Index for China and its relationship with air pollution

et al. 2018

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“…The models were run for 240 hrs with initial height fixed at 500 m. Figure shows that the back trajectories from both the locations point to northwestern India, toward the states of Haryana and Punjab. The trajectories that are color coded by height (in meters above ground level) show that most of the pollutants are transported from north‐northwest India at heights below 500 m or less, which is mostly well within the planetary boundary layer height that is prevalent during the postmonsoon period (Patil et al, ). This also agrees with similar observations that have been made over other biomass burning areas where most of the aerosol load was found to be restricted within the mixing layer with rare evidence of injection to the free troposphere (Bikkina et al, ; Labonne et al, ; Ram et al, ).…”

Section: Prevailing Wind Patternmentioning

confidence: 99%

Crop Residue Burning in Northern India: Increasing Threat to Greater India

2018

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Crop residue burning (CRB) is a recurring problem, during October-November, in the northwestern regions (Punjab, Haryana, and western Uttar Pradesh) of India. The emissions from the CRB source regions spread in all directions through long-range transport mechanisms, depending upon the meteorological conditions. In recent years, numerous studies have been carried out dealing with the impact of CRB on the air quality of Delhi and surrounding areas, especially in the Indo-Gangetic Basin (also referred to as Indo-Gangetic Plain). In this paper, we present detailed analysis using both satellite-and ground-based sources, which show an increasing impact of CRB over the eastern parts of the Indo-Gangetic Basin and also over parts of central and southern India. The increasing trends of finer black carbon particles and greenhouse gases have accelerated since the year 2010 onward, which is confirmed by the observation of different wavelength dependent aerosol properties. Our study shows an increased risk to ambient air quality and an increased spatiotemporal extent of pollutants in recent years, from CRB, which could be a severe health threat to the population of these regions.

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“…These two studies lay the groundwork for the global climatology of MD. Since then, the climatological characteristics of 5 MD over regional (e.g., for Swiss plateau by Coen et al (2014), for Indian sub-continent by Patil et al (2013)) or global scales have been investigated (Von Engeln and Teixeira, 2013;Ao et al, 2012;Xie et al, 2011;Jordan et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Climatological study of a new air stagnation index (ASI) for China and its relationship with air pollution

Huang

Cai

Wang

et al. 2018

Preprint

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Abstract. Air stagnation index (ASI) is a vital meteorological measure of the atmosphere's ability to dilute air pollutants. The original metric adopted by US National Climatic Data Center (NCDC) is found not well suitable to China, because the decouple between upper and lower atmospheric layer results in a weak link between the near surface air pollution and upper-air wind speed. Therefore, a new threshold for ASI is proposed, consisting of daily 10 maximal ventilation in the atmospheric boundary layer, precipitation and real latent instability. In the present study, the climatological features of this newly defined ASI is investigated. It shows that the spatial distribution of the new ASI is similar to the original one; that is, annual mean stagnations occur most often in the northwest and southwest basins, i.e., Xinjiang and Sichuan basins (more than 180 days), and the least over plateaus, i.e., QinghaiTibet and Yunnan plateaus (less than 40 days). However, the seasonal cycle of the new ASI is changed. Stagnation 15 days under new metric are observed to be maximal in winter and minimal in summer, which is positively correlated with air pollution index (API) during 2000-2012. The correlation between ASI and concentration of fine particulate matter (PM2.5) during January 2013 of Beijing is also investigated. It shows that the new ASI matches the day-byday variation of PM2.5 concentration very well and is able to catch the haze episodes in that month. 20

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Planetary Boundary Layer height over the Indian subcontinent during extreme monsoon years

Cited by 24 publications

References 39 publications

Climatological study of the Boundary-layer air Stagnation Index for China and its relationship with air pollution

Climatological study of the Boundary-layer air Stagnation Index for China and its relationship with air pollution

Crop Residue Burning in Northern India: Increasing Threat to Greater India

Climatological study of a new air stagnation index (ASI) for China and its relationship with air pollution

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