Atmospheric aerosol properties at a semi-rural location in southern India: particle size distributions and implications for cloud droplet formation

Shika, S.; Gadhavi, Harish; Suman, Mayank; Ravikrishna, R.; Gunthe, Sachin S.

doi:10.1007/s42452-020-2804-2

Cited by 12 publications

(2 citation statements)

References 55 publications

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“…Aerosol particles that are activated to droplets in a supersaturated water vapour condition are the cloud condensation nuclei (CCN), which have high affinity to water vapour (Hudson 1993, Patel and Jiang 2021, Jayachandran et al 2022. Aerosol number size distribution also plays an important role in the activation mechanism (Romakkaniemi et al 2012, Shika et al 2020. Post-activation droplet growth above the cloud base height is achieved by the condensation process of water vapour inside the clouds (Mason and Chien 1962, Paluch 1971, Vaillancourt et al 2001.…”

Section: Introductionmentioning

confidence: 99%

In-situ observations of cloud microphysics over Arabian Sea during dust transport events

Bera,

Patade,

Prabhakaran

2024

Environ. Res. Commun.

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The unique in-situ measurements of clouds and precipitation within the shallow and deep cumulus over the north-eastern Arabian Sea region during the Indian monsoon are illustrated in this study with a focus on droplet spectral parameters. The observational period showed a significant incursion of Arabian dust and the presence of giant cloud condensation nuclei (GCCN), modifying the cloud and precipitation spectral properties. Warm rain microphysics supported the mixed-phase development in these clouds and exhibited hydrometeors of snow, graupel and large aggregates as part of ice process. Cloud base droplet number concentration is about 142±79 cm-3 which is one third of the cloud condensation nuclei (CCN) number concentration at 0.2 % supersaturation. A rapid broadening of droplet size distribution (DSD) near to the cloud base was noted in contrast to polluted continental clouds. Relationship between the relative dispersion (ε; the ratio of DSD spectral width (σ) to mean radius (r_m)) and liquid water adiabatic fraction (AF) indicates that entrainment effect has increased relative dispersion significantly (2-3 times larger) in these clouds. Effective radius (r_eff) is found to be proportional to mean volume radius (r_v) with a proportionality constant (β) that varies between 1.0-1.6, depending on the spectral dispersion parameter. Drop size distributions for the small cloud droplets with size range 2-50 μm and the large drizzle drops (or ice hydrometeors) with size range 100-6400 μm are parameterized using the gamma function distributions useful for large-scale cloud models.

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Section: Introductionmentioning

confidence: 99%

In-situ observations of cloud microphysics over Arabian Sea during dust transport events

Bera,

Patade,

Prabhakaran

2024

Environ. Res. Commun.

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“…In India, several intensive field campaigns such as the Indian Ocean Experiment (INDOEX; Ramanathan et al, 2001), Indian Space Research Organization (ISRO)-Geosphere-Biosphere Programme (GBP)-Land campaign II (Tripathi et al, 2006;Tare et al, 2006), and Integrated Campaign for Aerosols, gases, and Radiation Budget (ICARB; Moorthy et al, 2008;Nair et al, 2020;Kompalli et al, 2020) have measured sub-micron particle number size distributions (PNSDs). There are also short-and long-term field observations of sub-micron PNSDs in a variety of diverse locations in India (Hyvärinen et al, 2010;Kanawade et al, 2014a;Shika et al, 2020;Tripathi et al, 1988;Komppula et al, 2009;Singh et al, 2004;Moorthy et al, 2011;Babu et al, 2016;Kompalli et al, 2018). However, there are sparse studies in India characterizing seasonal variation in PNSDs and number concentrations (Kanawade et al, 2014a;Hyvärinen et al, 2010;Komppula et al, 2009;Hooda et al, 2018;Laj et al, 2020) and atmospheric NPF (Sebastian et al, 2021b;Siingh et al, 2018;Neitola et al, 2011;Moorthy et al, 2011;Kanawade et al, 2014b, c;Kanawade et al, 2020a).…”

Section: Introductionmentioning

confidence: 99%

Observations of particle number size distributions and new particle formation in six Indian locations

et al. 2022

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Abstract. Atmospheric new particle formation (NPF) is a crucial process driving aerosol number concentrations in the atmosphere; it can significantly impact the evolution of atmospheric aerosol and cloud processes. This study analyses at least 1 year of asynchronous particle number size distributions from six different locations in India. We also analyze the frequency of NPF and its contribution to cloud condensation nuclei (CCN) concentrations. We found that the NPF frequency has a considerable seasonal variability. At the measurement sites analyzed in this study, NPF frequently occurs in March–May (pre-monsoon, about 21 % of the days) and is the least common in October–November (post-monsoon, about 7 % of the days). Considering the NPF events in all locations, the particle formation rate (JSDS) varied by more than 2 orders of magnitude (0.001–0.6 cm−3 s−1) and the growth rate between the smallest detectable size and 25 nm (GRSDS-25 nm) by about 3 orders of magnitude (0.2–17.2 nm h−1). We found that JSDS was higher by nearly 1 order of magnitude during NPF events in urban areas than mountain sites. GRSDS did not show a systematic difference. Our results showed that NPF events could significantly modulate the shape of particle number size distributions and CCN concentrations in India. The contribution of a given NPF event to CCN concentrations was the highest in urban locations (4.3 × 103 cm−3 per event and 1.2 × 103 cm−3 per event for 50 and 100 nm, respectively) as compared to mountain background sites (2.7 × 103 cm−3 per event and 1.0 × 103 cm−3 per event, respectively). We emphasize that the physical and chemical pathways responsible for NPF and factors that control its contribution to CCN production require in situ field observations using recent advances in aerosol and its precursor gaseous measurement techniques.

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Effect of Ocean Warming on Cloud Properties Over India and Adjoining Oceanic Regions

Shah

Srivastava

2020

Pure Appl. Geophys.

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Atmospheric aerosol properties at a semi-rural location in southern India: particle size distributions and implications for cloud droplet formation

Cited by 12 publications

References 55 publications

In-situ observations of cloud microphysics over Arabian Sea during dust transport events

In-situ observations of cloud microphysics over Arabian Sea during dust transport events

Observations of particle number size distributions and new particle formation in six Indian locations

Effect of Ocean Warming on Cloud Properties Over India and Adjoining Oceanic Regions

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