Informatics Publishing Limited

Kuo Wang ¹, Lian Chen ¹, Tao Feng ¹, Chaohui Song ¹, Dawei Gao ¹

Affiliations
1 Zhejiang Climate Center, Zhejiang Meteorological Bureau, Hangzhou-310017, CN

Abstract

Based on the analysis of Asian temperature, the Asian Warming Hole (AWH) index is proposed in this paper to measure the intensity during the cold events process under the background of global warming in the early 21st century winter. The results show that the Asian continent is indeed experiencing a cold stage in the early 21st century winter, but it is just in a cold phase and will become warmer in the future. The relationship of AWH with atmospheric circulation is statistically close. Moreover, the sea surface temperature (SST) lead of 6 months, shows a higher correlation coefficient with AHW index. The SST anomalies over mid-latitude and high latitude Pacific regions may play an important role in Asian cold events in winter, but it is not stable as a precursor factor. The mechanism of this phenomenon is very complex, the atmosphere can reflect some characteristics, while ENSO cycle signal is more and more significant in recent years.

Keywords

Asian Warming Hole (AWH), Global Warming, Sea Surface Temperature, Arctic Oscillation.

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Dongfang Xu ¹, Tao Feng ¹, Jing Yang ², Zuoya Qin ²

Affiliations
1 Hunan University of Science and Technology, Xiangtan 411 201, CN
2 Hunan Provincial Coal Science Research Institute, Changsha 410 004, CN

Abstract

This research intends to obtain the pressure relief angle of protective scope through research and study of the protective scope and effects after mining of coal seam No. 2 as the protective seam of coal seam No. 5 in mining area No. 23 of Jinzhushan Mining Co., Ltd. CBM flow attenuation coefficients of taps within protective area are reduced from 0.016 and 0.015 d-1 before mining to 0.008 and 0.011 d-1; and average CBM extraction amount in seven days is raised by two to three times. This research provides scientific basis for mining of protective seams for the mine.

Keywords

Protective Seam, Pressure Relief Angle, Attenuation Coefficient, CBM Flow.

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