Changes in Aerosol Optical and Micro-Physical Properties over Northeast Asia from a Severe Dust Storm in April 2014

Abstract. An Ensemble Kalman Filter (EnKF) data assimilation system was developed for a regional dust transport model. This paper applied the EnKF method to investigate modeling of severe dust storm episodes occurring in March 2002 over China based on surface observations of dust concentrations to explore the impact of the EnKF data assimilation systems on forecast improvement. A series of sensitivity experiments using our system demonstrates the ability of the advanced EnKF assimilation method using surface observed PM10 in North China to correct initial conditions, which leads to improved forecasts of dust storms. However, large errors in the forecast may arise from model errors (uncertainties in meteorological fields, dust emissions, dry deposition velocity, etc.). This result illustrates that the EnKF requires identification and correction model errors during the assimilation procedure in order to significantly improve forecasts. Results also show that the EnKF should use a large inflation parameter to obtain better model performance and forecast potential. Furthermore, the ensemble perturbations generated at the initial time should include enough ensemble spreads to represent the background error after several assimilation cycles.

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Short-Term Variations of Aerosol Optical Depth during the Severe Dust Storm in 2015 over the Middle East and Long-term Variations of Aerosol Optical Properties

Environment Pollution and Climate Change ◽

10.4172/2573-458x.1000127 ◽

2017 ◽

Vol 01 (03) ◽

Author(s):

Foroozan Arkian

Keyword(s):

Optical Properties ◽

Middle East ◽

Aerosol Optical Depth ◽

Optical Depth ◽

Dust Storm ◽

Aerosol Optical Properties ◽

Short Term ◽

Long Term Variations ◽

Severe Dust Storm

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Analysis on the chemical and physical properties of particles in a dust storm in spring in Beijing

Powder Technology ◽

10.1016/j.powtec.2003.08.056 ◽

2003 ◽

Vol 137 (1-2) ◽

pp. 77-82 ◽

Cited By ~ 26

Author(s):

Renjian Zhang ◽

Mingxing Wang ◽

Xiaoye Zhang ◽

Guanghua Zhu

Keyword(s):

Physical Properties ◽

Dust Storm

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Sand/dust storm processes in Northeast Asia and associated large-scale circulations

Atmospheric Chemistry and Physics ◽

10.5194/acp-8-25-2008 ◽

2008 ◽

Vol 8 (1) ◽

pp. 25-33 ◽

Cited By ~ 50

Author(s):

Y. Q. Yang ◽

Q. Hou ◽

C. H. Zhou ◽

H. L. Liu ◽

Y. Q. Wang ◽

...

Keyword(s):

Dust Storm ◽

General Circulation ◽

Large Scale ◽

Transition Period ◽

Northeast Asia ◽

Lower Troposphere ◽

Northern China ◽

Wind Anomaly ◽

Cold Air ◽

Sand Dust

Abstract. This paper introduces a definition of sand/dust storm process as a new standard and idea of sand/dust storm (SDS) groups a number of SDS-events in Northeast Asia. Based on the meteorological data from WMO/GOS network, 2456 Chinese surface stations and NCEP-NCAR reanalysis, the sand/dust storm processes in Northeast Asia in spring 2000–2006 are investigated. And the evolutions of anomalies of general circulation in the troposphere are analyzed by comparing the spring having most and least occurrences of SDS in year 2006 and 2003. Associated with the noticeably increased occurrence of SDS processes in spring 2006, the anomalies in 3-D structure of general circulation especially in the mid-and high latitudes of the Northen Hemisphere (NH) are revealed. The transition period from the winter of 2005 to spring 2006 has witnessed a fast-developed high center over the circumpolar vortex area in the upper troposphere, which pushes the polar vortex more southwards to mid-latitudes with a more extensive area over the east NH. In spring 2006, there are the significant circulation anomalies in the middle troposphere from the Baikal Lake to northern China with a stronger southward wind anomaly over Northeast Asia. Compared with a normal year, stronger meridional wind with a southward wind anomaly also in the lower troposphere prevail over the arid and semiarid regions in Mongolia and northern China during spring 2006. The positive anomalies of surface high pressure registered an abnormal high of 4–10 hPa in the Tamil Peninsular make a stronger cold air source for the repeated cold air outbreak across the desert areas in spring 2006 resulting in the most frequent SDS seasons in the last 10 years in Northeast Asia.

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