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A continuous measurement for black carbon (hereafter "BC") in a 40 m shallow ice core retrieved from the East Rongbuk Glacier (hereafter "ERG") in the northeast saddle of Mt. Qomolangma (Everest) provided the first his- torical record of BC deposition during the past 50 yrs in the high Himalyas. Apparent increasing trend (smooth aver- age) of BC concentrations was revealed since the mid-1990s. Seasonal variability of BC concentrations in the ice core in- dicated higher concentrations in monsoon seasons than those in non-monsoon seasons. Backward air trajectory analy- sis by the HYSPLIT model indicated that South Asia's BC emissions had significant impacts on the BC deposition in the Mt. Qomolangma (Everest) region. The estimated aver- age atmospheric BC concentration in the region was about 80 ng m 3 during 1951-2001. And it was suggested BC emitted from South Asia could penetrate into the Tibetan Plateau by climbing over the elevated Himalayas. A signifi- cant increasing trend of the radiative forcing simulated by the SNICAR model appeared since 1990, which even exceeded 4.5 W m 2 in the summer of 2001. It was suggested that this amplitudes of BC concentrations in the atmosphere over the Himalayas and consequently in the ice in the glaciers could not be neglected when assessing the dual warming effects on glacier melting in the Himalayas.

Black carbon record based on a shallow Himalayan ice core and its climatic implications