Atmospheric Brown Cloud (ABC) Gosan Campaign: East Asian Regional Experiment 2005

This paper provides the implementation plan and the related information of the ABC Gosan campaign, EAREX2005, organized by scientists under the UNEPIABC-Asia project (Ramanathan and Crutzen, 2003). The objective of the ABC-Asia is to understand the effects of air pollution and mineral dust in the Asian region to the earth's climate and environment. Two regional experiments for the first phase of the ABC project have been planed in order to delineate the regional aspects of the effects and to compare the results from instruments used by different groups in the project in order to assure the homogeneity of data acquired by the ABC monitoring system in Asia. The earlier regional experiment preceding EAREX2005 is the ABC Maldives Monsoon Experiment (APMEX) conducted from 1 October to 15 November 2004 in the South Asian region with the main station at Hanimaadhoo, Maldives. Following the APMEX, the EAREX2005 has been conducted in March 2005 in the East Asian region (Fig. 1) where large anthropogenic emission sources of aerosols and gases are distributed. Especially in springtime the area is covered by various types of aerosols including Asian mineral dust and anthropogenic aerosols. The difference in the air inass characteristics in the two regions is important for the comparison of the two experiments.