scholarly journals Transport Pathways and Potential Source Regions of PM2.5 on the West Coast of Bohai Bay during 2009–2018

Atmosphere ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 345 ◽  
Author(s):  
Tianyi Hao ◽  
Ziying Cai ◽  
Shucheng Chen ◽  
Suqin Han ◽  
Qing Yao ◽  
...  
Keyword(s):  
West Coast ◽  
Natural Source ◽  
Anthropogenic Source ◽  
Bohai Bay ◽  
Transport Pathway ◽  
The West ◽  
Transport Pathways ◽  
Air Masses ◽  
Source Regions ◽  
Potential Source

Mass concentration data for particulate matter with an aerodynamic diameter less than or equal to 2.50 μm (PM2.5) combined with backward trajectory cluster analysis, potential source contribution function (PSCF), and concentration weighted trajectory (CWT) methods were used to investigate the transport pathways and potential source regions of PM2.5 on the west coast of Bohai Bay from 2009 to 2018. Two pathways responsible for the transportation of high PM2.5 levels were identified, namely a southerly pathway and a northwesterly pathway. The southerly pathway represented the major transport pathway of PM2.5 for all seasons. As a regional transport pathway, it had the greatest impact in winter, followed by autumn. The southerly transport pathway passed over the Shandong and Hebei provinces before reaching Tianjin: Air masses were transported within the boundary layer (below 925 hPa), representing a slow-moving air flow. The northwesterly pathway mostly occurred in winter and autumn and passed over desert and semidesert regions in Outer Mongolia, the sand lands of Inner Mongolia, and Hebei. The air masses associated with the northwesterly pathway represented fast-moving airflows responsible for long-range transportation of PM2.5. Two potential source regions that contributed to high PM2.5 loadings on the west coast of Bohai Bay were identified, “southerly source regions” and “northwesterly source regions”. The southerly source regions, with weighted CWT (WCWT) values in winter greater than 140.00 μg/m3, were anthropogenic source regions, including southern Hebei, western Shandong, eastern Henan, northern Anhui, and northern Jiangsu. The northwesterly source regions, with WCWT values in winter of 80.00–140.00 μg/m3, were natural source regions, encompassing central Inner Mongolia and southern Mongolia. In addition, the southerly transport pathway passed though anthropogenic source regions, while the northwesterly transport pathway passed though natural source regions. The impacts of anthropogenic source regions on PM2.5 loadings on the west coast of Bohai Bay were greater than those of natural source regions.

scholarly journals Identification of Long-Range Transport Pathways and Potential Source Regions of PM2.5 and PM10 at Akedala Station, Central Asia

Atmosphere ◽  
2020 ◽  
Vol 11 (11) ◽  
pp. 1183
Author(s):  
Hanlin Li ◽  
Qing He ◽  
Xinchun Liu
Keyword(s):  
Central Asia ◽  
Transport Pathways ◽  
Air Masses ◽  
Source Areas ◽  
Northern Xinjiang ◽  
Source Regions ◽  
Potential Source ◽  
Western Mongolia ◽  
Pm2.5 And Pm10 ◽  
Eastern Kazakhstan

Cluster analyses, potential source contribution function (PSCF) and concentration-weight trajectory (CWT) were used to identify the main transport pathways and potential source regions with hourly PM2.5 and PM10 concentrations in different seasons from January 2017 to December 2019 at Akedala Station, located in northwest China (Central Asia). The annual mean concentrations of PM2.5 and PM10 were 11.63 ± 9.31 and 19.99 ± 14.39 µg/m3, respectively. The air pollution was most polluted in winter, and the dominant part of PM10 (between 54 to 76%) constituted PM2.5 aerosols in Akedala. Particulate pollution in Akedala can be traced back to eastern Kazakhstan, northern Xinjiang, and western Mongolia. The cluster analyses showed that the Akedala atmosphere was mainly affected by air masses transported from the northwest. The PM2.5 and PM10 mainly came with air masses from the central and eastern regions of Kazakhstan, which are characterized by highly industrialized and semi-arid desert areas. In addition, the analyses of the pressure profile of back-trajectories showed that air mass distribution were mainly distributed above 840 hPa. This indicates that PM2.5 and PM10 concentrations were strongly affected by high altitude air masses. According to the results of the PSCF and CWT methods, the main potential source areas of PM2.5 were very similar to those of PM10. In winter and autumn, the main potential source areas with high weighted PSCF values were located in the eastern regions of Kazakhstan, northern Xinjiang, and western Mongolia. These areas contributed the highest PM2.5 concentrations from 25 to 40 µg/m3 and PM10 concentrations from 30 to 60 µg/m3 in these seasons. In spring and summer, the potential source areas with the high weighted PSCF values were distributed in eastern Kazakhstan, northern Xinjiang, the border between northeast Kazakhstan, and southern Russia. These areas contributed the highest PM2.5 concentrations from 10 to 20 µg/m3 and PM10 concentrations from 20 to 60 µg/m3 in these seasons.

scholarly journals Long-range transport pathways of tropospheric source gases originating in Asia into the northern lower stratosphere during the Asian monsoon season 2012

2016 ◽  
Author(s):  
Bärbel Vogel ◽  
Gebhard Günther ◽  
Rolf Müller ◽  
Jens-Uwe Grooß ◽  
Armin Afchine ◽  
...  
Keyword(s):  
Northern Hemisphere ◽  
Asian Monsoon ◽  
Lower Stratosphere ◽  
Monsoon Season ◽  
Transport Pathway ◽  
Transport Pathways ◽  
Air Masses ◽  
Horizontal Transport ◽  
Source Regions ◽  
Subtropical Jet

Abstract. Global simulations with the Chemical Lagrangian Model of the Stratosphere (CLaMS) using artificial tracers of air mass origin are used to analyze transport pathways from the Asian monsoon region into the lower stratosphere. In a case study, the transport of air masses from the Asian monsoon anticyclone originating in India/China by an eastward migrating anticyclone breaking off from the main anticyclone on 20 September 2012 and filaments separated at the northeastern flank of the anticyclone are analyzed. Enhanced contributions of young air masses (younger than 5 months) are found within the separated anticyclone confined at the top by the thermal tropopause. Further, these air masses are confined by the anticyclonic circulation and at the polar side by the subtropical jet such as the vertical structure looks like a bubble within the upper troposphere. Subsequently, these air masses are transported eastwards along the subtropical jet and enter the lower stratosphere by quasi-horizontal transport in a region of double tropopauses most likely associated with Rossby wave breaking events. As a result, thin filaments with enhanced signatures of tropospheric trace gases are measured in the lower stratosphere over Europe during the TACTS/ESMVal campaign in September 2012 in very good agreement with CLaMS simulations. Our simulations demonstrate that source regions in Asia and in the Pacific Ocean have a significant impact on the chemical composition of the lower stratosphere of the Northern Hemisphere by flooding the extratropical lower stratosphere with young moist air masses in particular at end of the monsoon season in September/October 2012 (up to ~30 % at 380 K) in contrast to the southern hemisphere. End of October 2012, approximately 1.5 ppmv H2O is found in the lower northern hemisphere stratosphere (at 380 K) from source regions in Asia and the tropical Pacific compared to a mean water vapor content of ~5 ppmv. In addition to this main transport pathway from the Asian monsoon anticyclone to the east along the subtropical jet and subsequent transport into the northern lower stratosphere, a second horizontal transport pathway out of the anticyclone to the west into the tropics (TTL) is found in agreement with MIPAS HCFC-22 measurements.

Holocene sea level trend on the west coast of Bohai Bay, China: reanalysis and standardization

2021 ◽  
Vol 40 (7) ◽  
pp. 198-248
Author(s):  
Jianfen Li ◽  
Zhiwen Shang ◽  
Fu Wang ◽  
Yongsheng Chen ◽  
Lizhu Tian ◽  
...  
Keyword(s):  
Sea Level ◽  
West Coast ◽  
Bohai Bay ◽  
The West ◽  
Sea Level Trend ◽  
Holocene Sea Level

The record of mid-Holocene maximum landward marine transgression in the west coast of Bohai Bay, China

2015 ◽  
Vol 359 ◽  
pp. 89-95 ◽  
Author(s):  
F. Wang ◽  
J. Li ◽  
Y. Chen ◽  
J. Fang ◽  
Y. Zong ◽  
...  
Keyword(s):  
West Coast ◽  
Bohai Bay ◽  
The West ◽  
Marine Transgression

New residence times of the Holocene reworked shells on the west coast of Bohai Bay, China

2016 ◽  
Vol 115 ◽  
pp. 492-506 ◽  
Author(s):  
Zhiwen Shang ◽  
Fu Wang ◽  
Jianfen Li ◽  
William A. Marshall ◽  
Yongsheng Chen ◽  
...  
Keyword(s):  
West Coast ◽  
Bohai Bay ◽  
Residence Times ◽  
The West ◽  
The Holocene

scholarly journals COVID-19 Personal Protection Equipment (PPE): A Potential Source of Microplastic Pollution in the State of Qatar

2020 ◽  
Author(s):  
Subramanian Veerasingam ◽  
Jassim A Al-Khayat ◽  
Ponnumony Vethamony
Keyword(s):  
West Coast ◽  
Plastic Waste ◽  
Personal Protection ◽  
The West ◽  
Home Office ◽  
Personal Protection Equipment ◽  
Marine Litter ◽  
Potential Source ◽  
Global Pandemic ◽  
The Impact

Coronavirus disease 2019 (COVID-19) has become a global pandemic. The personal protection equipment (PPE), especially medical face masks and N95 filtering face piece respirators (FFRs) are typically worn by people at home/office/working place/outside to protect from infection. Thus, the increase in consumption of facemasks and FFRs across Qatar has given rise to a new environmental challenge, adding to the vast plastic waste in the environment. Our team has already established the baseline levels of marine litter (ML) including plastic waste along the west coast of Qatar based on November 2019 ML survey (Veerasingam et al., 2020a). To study the impact of COVID-19 on ML, we have conducted another survey along the west coast of Qatar in July 2020. The distribution of PPE is higher on the southern part of west coast of Qatar than the northern part. Attenuated total reflectance - Fourier transform infrared (ATR-FTIR) spectroscopy was used to characterize the polymer types of surgical facemasks, N95 FFRs and gloves. Polypropylene (PP) and polyamide (PA) were the abundant polymer types of PPEs. This study confirmed that the PPE could be a potential source for microplastic contaminant in the environment, especially if the present situation continues. Therefore, proper waste removal measures have to be followed.

Sedimentary Dynamics along the West Coast of Bohai Bay, China, during the Twentieth Century

2014 ◽  
Vol 294 ◽  
pp. 379-388 ◽  
Author(s):  
F. Wang ◽  
H. Wang ◽  
Y. Zong ◽  
T.J. Andersen ◽  
Y.D. Pei ◽  
...  
Keyword(s):  
Twentieth Century ◽  
West Coast ◽  
Bohai Bay ◽  
The West ◽  
Sedimentary Dynamics

scholarly journals Evolution, Transport Characteristics, and Potential Source Regions of PM2.5 and O3 Pollution in a Coastal City of China during 2015–2020

Atmosphere ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1282
Author(s):  
Min Lv ◽  
Anyong Hu ◽  
Jun Chen ◽  
Bingcheng Wan
Keyword(s):  
The Yellow Sea ◽  
Transport Pathways ◽  
Entire Study ◽  
Coastal City ◽  
The North ◽  
Source Regions ◽  
Potential Source ◽  
Four Seasons ◽  
Extreme High Temperature ◽  
Pm2.5 Concentration

The evolution, transport characteristics, and potential source regions of PM2.5 and O3 were investigated from 1 January 2015 to 31 December 2020 in the coastal city of Nantong. The annual mean PM2.5 concentration declined obviously over the entire study period, and was 34.7 μg/m3 in 2020. O3 had a relatively smooth decreasing trend, but rebounded greatly during 2017 when the most frequent extreme high-temperature events occurred. Similar trends were observed for PM2.5 and O3 polluted hours. No PM2.5-O3 complex air pollution happened in 2019 and 2020, likely suggesting the preliminary results from the implementation of emission controls. Notable differences in transport pathways and frequencies were observed from the backward trajectory clusters in four seasons in Nantong. Clusters with the largest percentage of polluted PM2.5 and O3 trajectories were transported mostly over short distances rather than long distances. Analysis involving the potential source contribution function (PSCF) and concentration weighted trajectory (CWT) showed that PM2.5 polluted sources were from the adjacent western and northwestern provinces, whereas the influence of eastern marine sources was relatively small. O3 had a greatly different spatial distribution of polluted source regions from PM2.5, mostly covering the North China Plain, the Bohai Sea, and the Yellow Sea.

scholarly journals Fingerprinting sediments along the west coast of Jylland: interpreting provenance data

1969 ◽  
Vol 17 ◽  
pp. 25-28
Author(s):  
Christian Knudsen ◽  
Thomas Kokfelt ◽  
Troels Aagaard ◽  
Jesper Bartholdy ◽  
Morten Pejrup
Keyword(s):  
West Coast ◽  
Sedimentary Environment ◽  
Economic Value ◽  
Heavy Minerals ◽  
Provenance Analysis ◽  
Sample Collection ◽  
The West ◽  
Protection Measures ◽  
Transport Pathways ◽  
Provenance Data

The Danish North Sea coast is a dynamic sedimentary environment experiencing erosion, transport and re-deposition of sand along the coast. Because of the natural and economic value of the coastal zone expensive protection measures such as nourishment of the coast are undertaken. The present study utilises provenance analysis techniques developed at the Geological Survey of Denmark and Greenland (GEUS) to characterise the coastal sand bodies by fingerprinting the heavy minerals in the sand. The aims of the study are to test these new methods in an active sedimentary environment and to develop an understanding of transport pathways along the coast. A total of c. 40 samples have been collected and analysed as part of the project. This paper gives an outline of the project and provides examples of the methods used based on six samples from the Husby profile on the west coast of Jylland (Fig. 1). The study is a collaboration project involving GEUS and the Department of Geography and Geology (DGG) at Copenhagen University; GEUS is responsible for the analyses and DGG for sample collection.

scholarly journals Pollution Characteristics, Transport Pathways, and Potential Source Regions of PM2.5 and PM10 in Changchun City in 2018

2020 ◽  
Vol 17 (18) ◽  
pp. 6585 ◽  
Author(s):  
Fanhao Meng ◽  
Ju Wang ◽  
Tongnan Li ◽  
Chunsheng Fang
Keyword(s):  
Inner Mongolia ◽  
Liaoning Province ◽  
The Yellow Sea ◽  
Transport Pathways ◽  
Transmission Distance ◽  
Source Regions ◽  
Potential Source ◽  
Changchun City ◽  
Potential Source Contribution Function ◽  
Pm2.5 And Pm10

Air pollution has attracted increasing attention in recent years. Cluster analysis, scene analysis, and the potential source contribution function (PSCF), based on the backward trajectory model, were used to identify the transport pathways and potential source regions of PM2.5 and PM10 (particulate matter with an aerodynamic diameter of not more than 2.5 µm and 10 µm) in Changchun in 2018. In addition, the PSCF was slightly improved. The highest average monthly concentrations of PM2.5 and PM10 appeared in March and April, when they reached 53.9μg/m3 and 120.0 μg/m3, respectively. The main potential source regions of PM2.5 and PM10 were generally similar: western Jilin Province, northwestern Inner Mongolia, northeastern Liaoning Province, and the Yellow Sea region. The secondary potential source regions were southern Russia, central Mongolia, western Shandong Province, eastern Hebei Province, and eastern Jiangsu Province. The northwest and southwest directions were found to be the two pathways that mainly affect the air quality of Changchun City. Moreover, the northwestern pathway had a larger potential contribution source area than the southwestern pathway. The airflow in the southwest direction came from Liaoning Province, Shandong Province, and the Yellow Sea region. This mainly occurred in summer; its transmission distance was short; it had a relatively higher weight potential source contribution function (WPSCF) value; it can be regarded as a local source; and its representative pollutants were SO2 (sulfur dioxide), CO (carbon monoxide), and O3 (ozone). The northwestern pathway passed through Russia, Mongolia, and Inner Mongolia. The transmission distance of this pathway was longer; it had a relatively lower WPSCF value; it can be considered as a natural source to a certain extent; it mainly occurred in autumn and, especially, in winter; and the representative pollutants of this pathway were NO (nitric oxide), NOx (nitrogen oxide), PM2.5, and PM10.

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