scholarly journals Water-soluble dicarboxylic acids in the tropospheric aerosols collected over east Asia and western North Pacific by ACE-Asia C-130 aircraft

2003 ◽  
Vol 108 (D23) ◽  
Author(s):  
K. Kawamura
Keyword(s):  
East Asia ◽  
North Pacific ◽  
Western North Pacific ◽  
Dicarboxylic Acids ◽  
Water Soluble ◽  
Tropospheric Aerosols

scholarly journals A 12-year observation of water-soluble ions in TSP aerosols collected at a remote marine location in the western North Pacific: an outflow region of Asian dust

2015 ◽  
Vol 15 (11) ◽  
pp. 6437-6453 ◽  
Author(s):  
S. K. R. Boreddy ◽  
K. Kawamura
Keyword(s):  
East Asia ◽  
North Pacific ◽  
Western North Pacific ◽  
Dimethyl Sulfide ◽  
Water Soluble ◽  
Observation Site ◽  
Air Masses ◽  
Soluble Ions ◽  
Water Soluble Ions ◽  
Outflow Region

Abstract. In order to characterize the long-term trend of remote marine aerosols, a 12-year observation was conducted for water-soluble ions in TSP (total suspended particulate) aerosols collected from 2001 to 2012 in the Asian outflow region at Chichijima Island in the western North Pacific. We found a clear difference in chemical composition between the continentally affected and marine background air masses over the observation site. Asian continental air masses are delivered from late autumn to spring, whereas marine air masses were dominated in summer. Concentrations of non-sea salt (nss-) SO42−, NO3−, NH4+, nss-K+ and nss-Ca2+ are high in winter and spring and low in summer. On the other hand, MSA− (methanesulfonate) exhibits higher concentrations during spring and winter, probably due to springtime dust bloom or due to the direct continental transport of MSA− to the observation site. We could not find any clear decadal trend for Na+, Cl−, Mg2+ and nss-Ca2+ in all seasons, although there exists a clear seasonal trend. However, concentrations of nss-SO42− continuously decreased from 2007 to 2012, probably due to the decreased SO2 emissions in East Asia especially in China. In contrast, nss-K+ and MSA− concentrations continuously increased from 2001 to 2012 during winter and spring seasons, demonstrating that biomass burning and/or terrestrial biological emissions in East Asia are being increasingly transported from the Asian continent to the western North Pacific. This study also demonstrates that Asian dusts can act as an important source of nutrients for phytoplankton and thus sea-to-air emission of dimethyl sulfide over the western North Pacific.

scholarly journals A 12 year observation of water-soluble inorganic ions in TSP aerosols collected at a remote marine location in the western North Pacific: an outflow region of Asian dust

2015 ◽  
Vol 15 (5) ◽  
pp. 7419-7458 ◽  
Author(s):  
S. K. R. Boreddy ◽  
K. Kawamura
Keyword(s):  
East Asia ◽  
North Pacific ◽  
Western North Pacific ◽  
Inorganic Ions ◽  
Water Soluble ◽  
So2 Emissions ◽  
Observation Site ◽  
Air Masses ◽  
Water Soluble Inorganic Ions ◽  
Outflow Region

Abstract. In order to characterize the long term trend of remote marine aerosols, a 12 year observation was conducted for water-soluble inorganic ions in TSP aerosols collected from 2001–2012 in the Asian outflow region at a Chichijima Island in the western North Pacific. We found a clear difference in chemical composition between the continentally affected and marine background air masses over the observation site. Asian continental air masses are delivered from late autumn to spring, whereas marine air masses were dominated in summer. Concentrations of nss-SO42-, NO3-, NH4+, nss-K+ and nss-Ca2+ are high in winter and spring and low in summer. On the other hand, MSA- exhibits higher concentrations during spring and winter, probably due to springtime dust bloom or due to the direct continental transport of MSA- to the observation site. We could not find any clear decadal trend for Na+, Cl-, Mg2+ and nss-Ca2+ in all seasons, although there exists a clear seasonal trend. However, concentrations of nss-SO42- continuously decreased from 2007–2012, probably due to the decreased SO2 emissions in East Asia especially in China. In contrast, nss-K+ and MSA- concentrations continuously increased from 2001–2012 during winter and spring seasons, demonstrating that biomass burning and/or terrestrial biological emissions in East Asia are increasingly more transported from the Asian continent to the western North Pacific.

scholarly journals Coupling Modes of Climatological Intraseasonal Oscillation in the East Asian Summer Monsoon

2016 ◽  
Vol 29 (17) ◽  
pp. 6363-6382 ◽  
Author(s):  
Zehao Song ◽  
Congwen Zhu ◽  
Jingzhi Su ◽  
Boqi Liu
Keyword(s):  
East Asia ◽  
North Pacific ◽  
East Asian Summer Monsoon ◽  
Western North Pacific ◽  
Diabatic Heating ◽  
Asian Summer Monsoon ◽  
East Asian ◽  
Intraseasonal Oscillation ◽  
Rainfall Anomaly ◽  
Asian Summer

Abstract The present study used harmonic and multivariate empirical orthogonal function (MV-EOF) analyses to identify the existence of climatological intraseasonal oscillation (CISO) in the diabatic heating, precipitation, and circulation of the East Asian summer monsoon (EASM). The strongest CISO signals are found in the north of the western North Pacific, possibly because of the horizontal gradient of diabatic heating induced by the seasonal land–sea thermal contrast. Further, the phase relationship between the diabatic heating components maintains the EASM CISO. The first two coupling modes of EASM CISO in the circulation are robust during May through August, with a period of 40–80 days, and exhibit phase locking to the stepwise establishment of the EASM, which reveals the coaction of the Mongolian cyclone (MC) around Lake Baikal at 850 hPa, the western North Pacific subtropical high (WNPSH) at 500 hPa, and the South Asian high (SAH) over the Tibetan Plateau (TP) at 200 hPa. The first mode shows that the jointly enhanced MC, WNPSH, and SAH correspond to a tripole rainfall anomaly with strong mei-yu and baiu fronts over East Asia. The second mode, however, indicates the eastward and northwestward propagation of MC and WNPSH, respectively, with suppressed SAH, as well as a dipole rainfall anomaly over East Asia. Both the observations and numerical simulation verify the importance of daily diabatic heating and SST in maintaining the CISO modes over the WNP, where the condensation heating related to atmospheric forcing determines the local intraseasonal air–sea interaction.

Molecular characteristics of water-soluble dicarboxylic acids, ω-oxocarboxylic acids, pyruvic acid and α-dicarbonyls in the aerosols from the eastern North Pacific

2020 ◽  
Vol 224 ◽  
pp. 103812
Author(s):  
Mir Md. Mozammal Hoque ◽  
Kimitaka Kawamura ◽  
Tomohiro Nagayama ◽  
Bhagawati Kunwar ◽  
Edward T. Peltzer ◽  
...  
Keyword(s):  
Pyruvic Acid ◽  
North Pacific ◽  
Dicarboxylic Acids ◽  
Water Soluble ◽  
Molecular Characteristics ◽  
Oxocarboxylic Acids

scholarly journals Aircraft measurement of dicarboxylic acids in the free tropospheric aerosols over the western to central North Pacific

Tellus B ◽  
2011 ◽  
Vol 55 (3) ◽  
pp. 777-786 ◽  
Author(s):  
M. Narukawa ◽  
K. Kawamura ◽  
K. Okada ◽  
Y. Zaizen ◽  
Y. Makino
Keyword(s):  
North Pacific ◽  
Dicarboxylic Acids ◽  
Aircraft Measurement ◽  
Tropospheric Aerosols ◽  
Central North Pacific
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