Seasonal and Spatial Variability of Microparticles in Snowpits on the Tibetan Plateau, China |
| |
| Authors: | ZHANG Yulana c KANG Shichanga b ZHANG Qianggonga CONG Zhiyuana ZHANG Yongjuna GAO Tanguanga ca Laboratory of Tibetan Environment Changes L Surface Processes |
| |
| Institution: | (1) Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), 100085 Beijing, China;(2) State Key Laboratory of Marine Environmental Science, Xiamen University, 361005 Xiamen, China |
| |
| Abstract: | The work presents microparticle concentrations in snowpits from the East Rongbuk Glacier on Mt. Qomolangma (Everest) (ER)
(28.02°N, 86.96°E, 6536 m a.s.l.), the Zhadang Glacier on Mt. Nyainqentanglha (NQ) (30.47°N, 90.65°E, 5800m a.s.l.), and the
Guoqu Glacier on Mt. Geladaindong (GL) (33.95°N, 91.28°E, 5823m a.s.l.) over the Tibetan Plateau (TP). Variations of microparticle
and major ions (e.g. Mg2+, Ca2+) concentrations in snowpits show that the values of the microparticles and ions in the non-monsoon seasons are much higher
than those in the monsoon seasons. Annual flux of microparticle deposition at ER is lower than those at NQ and GL, which could
be attributed to the long distance away from the possible dust source regions as well as the elevation for ER higher than
the others. Compared with other remote areas, microparticle concentrations in the southern TP are much lower than those in
the northern TP, but still much higher than those in Greenland and Antarctica. The seasonal and spatial microparticle variations
are clearly related to the variations of atmospheric circulation according to the air mass 5-day backward trajectory analyses
of HYSPLIT Model. Resultingly, the high microparticle values in snow are mainly attributed to the westerlies and the strong
dust storm outbreaks on the TP, while the monsoon circulation brings great amount of precipitation from the Indian Ocean,
thus reducing in the aerosol concentrations. |
| |
| Keywords: | Microparticle seasonal change spatial variation snowpits Tibetan Plateau |
| 本文献已被 CNKI SpringerLink 等数据库收录！ |
|
