Aerosol characterization during the summer monsoon period over a tropical coastal Indian station, Visakhapatnam

2008 ◽  
Vol 113 (D21) ◽  
Author(s):  
B. L. Madhavan ◽  
K. Niranjan ◽  
V. Sreekanth ◽  
M. M. Sarin ◽  
A. K. Sudheer
Keyword(s):  
Summer Monsoon ◽  
Monsoon Period ◽  
Indian Station ◽  
Aerosol Characterization

Microphysical characteristics of clouds and precipitation during pre-monsoon and monsoon period over a tropical Indian station

2013 ◽  
Vol 94 ◽  
pp. 28-33 ◽  
Author(s):  
Kaustav Chakravarty ◽  
P. Ernest Raj ◽  
Aniruddha Bhattacharya ◽  
Animesh Maitra
Keyword(s):  
Monsoon Period ◽  
Indian Station

scholarly journals First measurement of atmospheric mercury species in Qomolangma Natural Nature Preserve, Tibetan Plateau, and evidence oftransboundary pollutant invasion

2019 ◽  
Vol 19 (2) ◽  
pp. 1373-1391 ◽  
Author(s):  
Huiming Lin ◽  
Yindong Tong ◽  
Xiufeng Yin ◽  
Qianggong Zhang ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Transition Period ◽  
Atmospheric Pollutants ◽  
Mercury Species ◽  
The Tibetan Plateau ◽  
Monsoon Period ◽  
Air Masses ◽  
Nature Preserve

Abstract. Located in the world's “third pole” and a remote region connecting the Indian plate and the Eurasian plate, Qomolangma National Nature Preserve (QNNP) is an ideal region to study the long-range transport of atmospheric pollutants. In this study, gaseous elemental mercury (GEM), gaseous oxidized mercury (GOM) and particle-bound mercury (PBM) were continuously measured during the Indian monsoon transition period in QNNP. A slight increase in the GEM concentration was observed from the period preceding the Indian summer monsoon (1.31±0.42 ng m−3) to the Indian summer monsoon period (1.44±0.36 ng m−3), while significant decreases were observed in the GOM and PBM concentrations, with concentrations decreasing from 35.2±18.6 to 19.3±10.9 pg m−3 (p < 0.001) for GOM and from 30.5±12.5 to 24.9±19.8 pg m−3 (p < 0.001) for PBM. A unique daily pattern was observed in QNNP with respect to the GEM concentration, with a peak value before sunrise and a low value at noon. Relative to the (low) GEM concentrations, GOM concentrations (with a mean value of 21.4±13.4 pg m−3, n=1239) in this region were relatively high compared with the measured values in some other regions of China. A cluster analysis indicated that the air masses transported to QNNP changed significantly at different stages of the monsoon, and the major potential mercury (Hg) sources shifted from northern India and western Nepal to eastern Nepal and Bangladesh. As there is a large area covered in glaciers in QNNP, local glacier winds could increase the transboundary transport of pollutants and transport polluted air masses to the Tibetan Plateau. The atmospheric Hg concentration in QNNP in the Indian summer monsoon period was influenced by transboundary Hg flows. This highlights the need for a more specific identification of Hg sources impacting QNNP and underscores the importance of international cooperation regarding global Hg controls.

scholarly journals Influence of dust and sea-salt sandwich effect on precipitation chemistry over the Western Ghats during summer monsoon

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
L. Yang ◽  
S. Mukherjee ◽  
G. Pandithurai ◽  
V. Waghmare ◽  
P. D. Safai
Keyword(s):  
Summer Monsoon ◽  
High Surface ◽  
Precipitation Chemistry ◽  
Sea Salt ◽  
Monsoon Period ◽  
Air Masses ◽  
Range Transport ◽  
Wind Regimes ◽  
High Uncertainty

AbstractAssessment of Sea Salt (SS) and Non-Sea Salt (NSS) aerosols in rainwater is important to understand the characterization of marine and continental aerosols and their source pathways. Sea salt quantification based on standard seawater ratios are primarily constrained with high uncertainty with its own limitations. Here, by the novelty of k-mean clustering and Positive Matrix Factorization (PMF) analysis, we segregate the air masses into two distinct clusters (oceanic and continental) during summer monsoon period signifying the complex intermingle of sources that act concomitantly. The rainwater composition during strong south-westerly wind regimes (cluster 2-oceanic) was profoundly linked with high sea salt and dust, whereas north-westerly low wind regimes (cluster 1-continental) showed an increase in SO42− and NO3−. However, SO42− abundance over NO3− in rain-water depicted its importance as a major acidifying ion at the region. The satellite-based observations indicate the presence of mid-tropospheric dust at the top (3–5 km) and marine sea salt at bottom acts as a “sandwich effect” for maritime clouds that leads to elevated Ca2+, Na+, Mg2+, and Cl− in rainwater. This characteristic feature is unique as sea spray generation due to high surface winds and dust aloft is only seen during this period. Furthermore, four source factors (secondary inorganic aerosol, mixed dust & sea salt, biomass burning & fertilizer use, and calcium neutralization) derived from PMF analysis showed contribution from local activities as well as long-range transport as dominant sources for the rainwater species.

Radiation and aerosol measurements over the Tibetan Plateau during the Asian summer monsoon period

2020 ◽  
Vol 11 (9) ◽  
pp. 1543-1551
Author(s):  
Jinqiang Zhang ◽  
Xiangao Xia ◽  
Hongrong Shi ◽  
Xuemei Zong ◽  
Jun Li
Keyword(s):  
Tibetan Plateau ◽  
Summer Monsoon ◽  
Asian Summer Monsoon ◽  
The Tibetan Plateau ◽  
Monsoon Period ◽  
Asian Summer

scholarly journals Characteristics of Rawinsonde Data-Based Storm-Relative Helicity Collected during the Early Summer Monsoon Period in the Southwest Korean Peninsula

SOLA ◽  
2018 ◽  
Vol 14 (0) ◽  
pp. 86-90 ◽  
Author(s):  
Sueng-Pil Jung ◽  
Tae-Yong Kwon ◽  
So-Ra In ◽  
Seon-Jeong Kim ◽  
Geon-Tae Kim ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
Korean Peninsula ◽  
Early Summer ◽  
Monsoon Period ◽  
Rawinsonde Data
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