Long-term variation of Asian dust and related climate factors

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

The relationship between long-term variation of Asian dust and climate indices was studied using a regional scale dust-transport model. Simulation results were examined using visibility-based observations by Chinese and Japanese Meteorological Agencies. Those results showed that the model reasonably captured interannual variations of Asian dust during 1972-2004. The long-term trend of dust days in the Gobi desert region showed a remarkable declining trend from the early 1980s-1997; the increasing trend of recent years (2000-02) was more conspicuous in Japan. Analyses of time variation of meteorological parameters in the Gobi region showed that the decreasing trend of dust days in this region is explained by the decreased frequency of strong winds. Additionally, anomaly analyses for dust and meteorological parameters in the Gobi region indicated that invasion of polar cold air played an important role in increasing dust phenomena. To clarify climate factors that affect dust emission and transport, regional climate indices that are appropriate for the scale of Asian dust storms were newly introduced. Correlation analyses between climate indices and simulated dust emissions showed that the dominant climate indices, which are closely correlated with dust emissions, were different in March and April. In March, the climate indices related to divergence of cold air from the polar region to mid-latitudes displayed a strong correlation with dust emissions, but during April, the climate index related to the south-north pressure gradient over the Gobi region exhibited a strong correlation with dust emission. Analyses of correlation between simulated surface dust concentrations and the Southern Oscillation Index (SOI) suggest that the El Niño/Southern Oscillation (ENSO) affects the dust transport path. Analyses of average dust transport flux at 130°E clarified variation of the transport path between La Niña years and El Niño years.

Original languageEnglish
Pages (from-to)6730-6740
Number of pages11
JournalAtmospheric Environment
Volume40
Issue number35
DOIs
Publication statusPublished - Nov 1 2006

Fingerprint

dust
climate
cold air
Southern Oscillation
dust storm
polar region
index
pressure gradient
regional climate
visibility
annual variation
desert
divergence
anomaly

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Atmospheric Science

Cite this

Long-term variation of Asian dust and related climate factors. / Hara, Yukari; Uno, Itsushi; Wang, Zifa.

In: Atmospheric Environment, Vol. 40, No. 35, 01.11.2006, p. 6730-6740.

Research output: Contribution to journalArticle

@article{eea47e27207944c39c3877aaf608a4df,
title = "Long-term variation of Asian dust and related climate factors",
abstract = "The relationship between long-term variation of Asian dust and climate indices was studied using a regional scale dust-transport model. Simulation results were examined using visibility-based observations by Chinese and Japanese Meteorological Agencies. Those results showed that the model reasonably captured interannual variations of Asian dust during 1972-2004. The long-term trend of dust days in the Gobi desert region showed a remarkable declining trend from the early 1980s-1997; the increasing trend of recent years (2000-02) was more conspicuous in Japan. Analyses of time variation of meteorological parameters in the Gobi region showed that the decreasing trend of dust days in this region is explained by the decreased frequency of strong winds. Additionally, anomaly analyses for dust and meteorological parameters in the Gobi region indicated that invasion of polar cold air played an important role in increasing dust phenomena. To clarify climate factors that affect dust emission and transport, regional climate indices that are appropriate for the scale of Asian dust storms were newly introduced. Correlation analyses between climate indices and simulated dust emissions showed that the dominant climate indices, which are closely correlated with dust emissions, were different in March and April. In March, the climate indices related to divergence of cold air from the polar region to mid-latitudes displayed a strong correlation with dust emissions, but during April, the climate index related to the south-north pressure gradient over the Gobi region exhibited a strong correlation with dust emission. Analyses of correlation between simulated surface dust concentrations and the Southern Oscillation Index (SOI) suggest that the El Ni{\~n}o/Southern Oscillation (ENSO) affects the dust transport path. Analyses of average dust transport flux at 130°E clarified variation of the transport path between La Ni{\~n}a years and El Ni{\~n}o years.",
author = "Yukari Hara and Itsushi Uno and Zifa Wang",
year = "2006",
month = "11",
day = "1",
doi = "10.1016/j.atmosenv.2006.05.080",
language = "English",
volume = "40",
pages = "6730--6740",
journal = "Atmospheric Environment",
issn = "1352-2310",
publisher = "Elsevier Limited",
number = "35",

}

TY - JOUR

T1 - Long-term variation of Asian dust and related climate factors

AU - Hara, Yukari

AU - Uno, Itsushi

AU - Wang, Zifa

PY - 2006/11/1

Y1 - 2006/11/1

N2 - The relationship between long-term variation of Asian dust and climate indices was studied using a regional scale dust-transport model. Simulation results were examined using visibility-based observations by Chinese and Japanese Meteorological Agencies. Those results showed that the model reasonably captured interannual variations of Asian dust during 1972-2004. The long-term trend of dust days in the Gobi desert region showed a remarkable declining trend from the early 1980s-1997; the increasing trend of recent years (2000-02) was more conspicuous in Japan. Analyses of time variation of meteorological parameters in the Gobi region showed that the decreasing trend of dust days in this region is explained by the decreased frequency of strong winds. Additionally, anomaly analyses for dust and meteorological parameters in the Gobi region indicated that invasion of polar cold air played an important role in increasing dust phenomena. To clarify climate factors that affect dust emission and transport, regional climate indices that are appropriate for the scale of Asian dust storms were newly introduced. Correlation analyses between climate indices and simulated dust emissions showed that the dominant climate indices, which are closely correlated with dust emissions, were different in March and April. In March, the climate indices related to divergence of cold air from the polar region to mid-latitudes displayed a strong correlation with dust emissions, but during April, the climate index related to the south-north pressure gradient over the Gobi region exhibited a strong correlation with dust emission. Analyses of correlation between simulated surface dust concentrations and the Southern Oscillation Index (SOI) suggest that the El Niño/Southern Oscillation (ENSO) affects the dust transport path. Analyses of average dust transport flux at 130°E clarified variation of the transport path between La Niña years and El Niño years.

AB - The relationship between long-term variation of Asian dust and climate indices was studied using a regional scale dust-transport model. Simulation results were examined using visibility-based observations by Chinese and Japanese Meteorological Agencies. Those results showed that the model reasonably captured interannual variations of Asian dust during 1972-2004. The long-term trend of dust days in the Gobi desert region showed a remarkable declining trend from the early 1980s-1997; the increasing trend of recent years (2000-02) was more conspicuous in Japan. Analyses of time variation of meteorological parameters in the Gobi region showed that the decreasing trend of dust days in this region is explained by the decreased frequency of strong winds. Additionally, anomaly analyses for dust and meteorological parameters in the Gobi region indicated that invasion of polar cold air played an important role in increasing dust phenomena. To clarify climate factors that affect dust emission and transport, regional climate indices that are appropriate for the scale of Asian dust storms were newly introduced. Correlation analyses between climate indices and simulated dust emissions showed that the dominant climate indices, which are closely correlated with dust emissions, were different in March and April. In March, the climate indices related to divergence of cold air from the polar region to mid-latitudes displayed a strong correlation with dust emissions, but during April, the climate index related to the south-north pressure gradient over the Gobi region exhibited a strong correlation with dust emission. Analyses of correlation between simulated surface dust concentrations and the Southern Oscillation Index (SOI) suggest that the El Niño/Southern Oscillation (ENSO) affects the dust transport path. Analyses of average dust transport flux at 130°E clarified variation of the transport path between La Niña years and El Niño years.

UR - http://www.scopus.com/inward/record.url?scp=34047274594&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34047274594&partnerID=8YFLogxK

U2 - 10.1016/j.atmosenv.2006.05.080

DO - 10.1016/j.atmosenv.2006.05.080

M3 - Article

AN - SCOPUS:34047274594

VL - 40

SP - 6730

EP - 6740

JO - Atmospheric Environment

JF - Atmospheric Environment

SN - 1352-2310

IS - 35

ER -