Variations of Dust Extinction Coefficient Estimated by Lidar Observations over Japan, 2007-2016

Shimizu, Atsushi; Sugimoto, Naoki; Nishizawa, Tomoaki; Jin, Yoshitaka; Batdorj, Dashdondog

doi:10.2151/sola.2017-037

Cited by 8 publications

(9 citation statements)

References 18 publications

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“…On the basis of the global ocean average, the MODISderived τ d of 0.047 is about a factor of 5 higher than the 0.009 from the CAM5 model. The MODIS-derived global mean τ m is 0.066 at 550 nm, which agrees well with the climatology based on AERONET observations (Kaufman et al, 2001;Smirnov et al, 2002). Although the CAM5 model agrees with the global mean of MODIS-derived marine AOD within 8 %, the model is higher at middle to high latitudes but lower in tropical regions than the MODIS-derived marine AOD.…”

Section: Climatology Of Combustion Aerosol and Dust From Modis And Cam5supporting

confidence: 80%

Interannual variability and trends of combustion aerosol and dust in major continental outflows revealed by MODIS retrievals and CAM5 simulations during 2003–2017

Yang

Wang

et al. 2020

Atmos. Chem. Phys.

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Abstract. Emissions and long-range transport of mineral dust and combustion-related aerosol from burning fossil fuels and biomass vary from year to year, driven by the evolution of the economy and changes in meteorological conditions and environmental regulations. This study offers both satellite and model perspectives on the interannual variability and possible trends of combustion aerosol and dust in major continental outflow regions over the past 15 years (2003–2017). The decade-long record of aerosol optical depth (AOD, denoted as τ), separately for combustion aerosol (τc) and dust (τd), over global oceans is derived from the Collection 6 aerosol products of the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard both Terra and Aqua. These MODIS Aqua datasets, complemented by aerosol source-tagged simulations using the Community Atmospheric Model version 5 (CAM5), are then analyzed to understand the interannual variability and potential trends of τc and τd in the major continental outflows. Both MODIS and CAM5 consistently yield a similar decreasing trend of −0.017 to −0.020 per decade for τc over the North Atlantic Ocean and the Mediterranean Sea that is attributable to reduced emissions from North America and Europe, respectively. On the contrary, both MODIS and CAM5 display an increasing trend of +0.017 to +0.036 per decade for τc over the tropical Indian Ocean, the Bay of Bengal, and the Arabian Sea, which reflects the influence of increased anthropogenic emissions from South Asia and the Middle East in the last 2 decades. Over the northwestern Pacific Ocean, which is often affected by East Asian emissions of pollution and dust, the MODIS retrievals show a decreasing trend of −0.021 per decade for τc and −0.012 per decade for τd, which is, however, not reproduced by the CAM5 model. In other outflow regions strongly influenced by biomass burning smoke or dust, both MODIS retrievals and CAM5 simulations show no statistically significant trends; the MODIS-observed interannual variability is usually larger than that of the CAM5 simulation.

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Section: Climatology Of Combustion Aerosol and Dust From Modis And Cam5supporting

confidence: 80%

Interannual variability and trends of combustion aerosol and dust in major continental outflows revealed by MODIS retrievals and CAM5 simulations during 2003–2017

Yang

Wang

et al. 2020

Atmos. Chem. Phys.

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“…and A.A. events were distributed in PM 1.1 while only about 45% proportion in Asian dust events with the obvious increasing contents in coarse particles. The highest contents were occurred in A.D. event with the concentrations of 10.3 μg/ m 3 , NO 3 − ion in A.D. event were increased about two times. Otherwise, Cl − ion in fine particles which usually caused from coal combustion, were high to 0.146 μg/m 3 in A.D. event [11].…”

Section: Resultsmentioning

confidence: 91%

“…SPM and PM 2.5 were obviously increased in A.D. event, especially in May 8, the concentrations were high to 33.3 and 18.6 μg/m 3 , was also with the highest NO 2 and the 45% humidity. In 10F sampling site, the concentrations of eight species of water-soluble ions in ambient particles were 6.12 μg/m 3 It was obvious to find that the ions were mainly distributed in PM 1.1 of the ambient particles in both 10F and roadside sites. Wang also determined the ionic contents that were mainly distributed in PM 1.1 of Shanghai, Saitama and Nagasaki in summer of 2015 [10].…”

Section: Resultsmentioning

confidence: 94%

“…Asian dust, as a meteorological phenomenon, always originates in the deserts of Mongolia and Kazakhstan and affects much of East Asian especially during the spring months every year [2]. The arrival of the Asian dust event in Japan is always marked by the obvious increases of airborne particles, decreases visibility and has an impact on human health [3]. For example, Kanatani detected the impacts of Asian dust particles on allergy symptoms of pregnant women by using lidar observations [4].…”

Section: Introductionmentioning

confidence: 99%

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Chemical characteristics of water-soluble ions and metal elements in ambient particles of Saitama, Japan during the spring asian dust event, 2017

Wang¹,

Wang²

2019

Int. J. EI

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Metropolitan Tokyo area in Japan suffered from a strong Asian dust event which was lasted for 3 days from May 6 to May 8 in 2017. Asian dust particles are usually originated from the deserts of Mongolia and Kazakhstan and could be absorbed air pollutants contained the metals, water-soluble and organic matters during transport process. In this research, two sampling sites called 10F (30 m height above ground level) and roadside in Saitama were selected to collect five different size particles (PM 1.1 , PM 1.1-2.0 , PM 2.0-3.3 , PM 3.3-7.0 and the coarse particles (>7.0 μm) of three different events: (1) before Asian dust event (B.A.), (2) during Asian dust event (D.A.) and (3) after Asian dust event (A.A.). Eight watersoluble ionic and 23 elemental species in D.A. event were higher than other periods. In D.A. event, the ionic contents in 10F were high to 10.3 μg/m 3 and the elemental contents in roadside were 6.50 μg/ m 3 which were higher than those in roadside. Ionic contents were mainly distributed in PM 1.1 with the high contents of secondary particles (NH 4 + , NO 3 − and SO 4 2− ). Ca 2+ , Cl − and Na + were more enriched in the coarse particles. Ion balance in D.A. event was more basic in 10F and more acidic in roadside. The higher ratios of NO 3 − /SO 4 2− in PM 1.1 were also occurred in D.A. event. Total elements were high (6,050 ng/m 3 ) in 10F with the several times increasing in PM 3.3-7.0 and the coarse particles, and the great contribution form the crustal elements (Al, Fe, Na, Mg and K). Enrichment factors (EFs) of trace elements in PM 1.1 indicating the anthropogenic sources might be the main sources of those ions. EFs in the coarse particles indicating high concentrations of crustal elements might be affected by the Asian dust event. The analysis of air masses backward trajectories showed that the deserts of Mongolia and Kazakhstan and the northern part of China were the important air pollutant origins in Asian dust events with long-distance transport.

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“…The dust and spherical extinction coefficients in the AD-Net data product are also used in climatological studies of Asian dust [20] and air pollution [2,21]. A decreasing trend of air pollution aerosols is seen over Japan in recent several years reflecting the reduction of emission in China.…”

Section: Studies Using Ad-net Datamentioning

confidence: 99%

Long-range transport of mineral dust observed with the Asian Dust and aerosol lidar observation Network (AD-Net)

et al. 2019

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AD-Net is an aerosol observation network using continuously operated multi-parameter lidars consists of 20 stations in East Asia. It is a “contributing network” of the WMO Global Atmosphere Watch (GAW) Program and is an Asian component of the GAW Aerosol Lidar Observation Network (GALION). The standard lidars in AD-Net are two-wavelength (1064 and 532 nm) and polarization (532 nm) lidars, but multiwavelength Raman lidars and a multiwavelength high-spectral-resolution (532 nm) and Raman (355 nm) lidar are also employed. The Mie scattering data from the AD-Net lidars are processed in near realtime (every hour) and published on the AD-Net www page in NetCDF format and graphical indications. AD-Net data are used in monitoring and various studies of Asian dust and regional air pollution. Analyses combining with chemical transport models showed that dust affecting the lower troposphere in Japan was mostly from the Gobi Desert, and dust from the Taklamakan was often transported in the free troposphere very long range. A case of Sahara dust transported through the Middle East and Central Asia was also found. Asian dust transported through polluted areas in East Asia is often internally mixed with air pollution. Results of studies using AD-Net lidars, in-situ polarization particle counters (POPCs), and sampling measurements of chemical composition are introduced.

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Variations of Dust Extinction Coefficient Estimated by Lidar Observations over Japan, 2007-2016

Cited by 8 publications

References 18 publications

Interannual variability and trends of combustion aerosol and dust in major continental outflows revealed by MODIS retrievals and CAM5 simulations during 2003–2017

Interannual variability and trends of combustion aerosol and dust in major continental outflows revealed by MODIS retrievals and CAM5 simulations during 2003–2017

Chemical characteristics of water-soluble ions and metal elements in ambient particles of Saitama, Japan during the spring asian dust event, 2017

Long-range transport of mineral dust observed with the Asian Dust and aerosol lidar observation Network (AD-Net)

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