Light-absorbing snow impurity concentrations measured on Northwest Greenland ice sheet in 2011 and 2012

Light-absorbing snow impurity concentrations measured on Northwest Greenland ice sheet in 2011 and 2012
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DOI:
10.5331/bgr.32.21
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发表时间:
2014
影响因子:
1
通讯作者:
T. Aoki;S. Matoba;S. Yamaguchi;T. Tanikawa;M. Niwano;K. Kuchiki;K. Adachi;J. Uetake;H. Motoyama;M. Hori
T. Aoki;S. Matoba;S. Yamaguchi;T. Tanikawa;M. Niwano;K. Kuchiki;K. Adachi;J. Uetake;H. Motoyama;M. Hori
中科院分区:
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文献类型:
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作者:
T. Aoki;S. Matoba;S. Yamaguchi;T. Tanikawa;M. Niwano;K. Kuchiki;K. Adachi;J. Uetake;H. Motoyama;M. Hori

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2011年8月1日至2012年7月12日,在格陵兰岛西北部的SIGMA-A(78�N,68�W,海拔1,490�m)地区,对三个地点的元素碳(EC),有机碳(OC)和矿物尘埃的光吸收雪杂质进行了测量。在SIGMA-A中,在2012年的观测期间发现了明显的地表下降和积雪融化,当时在GrIS上记录了地表融化事件。� 该时期开始时,EC、OC和灰尘的表面浓度分别为0.9、3.8和107 ppbw,到了最后,EC、OC和灰尘的浓度分别增加到4.9、17.2和1327 ppbw。2011年的EC和粉尘浓度明显高于三个地点的水平,最近的测量结果也是在Summit。然而,我们对EC和OC的测量可能被低估,因为最近的研究表明石英纤维的收集效率
Light-absorbingsnowimpuritiesofelementalcarbon�(EC),�organiccarbon�(OC),�andmineraldusthave� beenmeasuredatthreelocationsatelevationsfrom�1,469�to�1,992�monAugust�1,�2011,�andatthesite� SIGMA-A�(78�N,�68�W,�elevation�1,490�m)�onthenorthwestGreenlandicesheet�(GrIS)�duringtheperiod� fromJune�28�toJuly�12,�2012. AtSIGMA-A,�aremarkablesnowsurfaceloweringtogetherwithsnow� meltingwasobservedduringtheobservationperiodin�2012,�whenarecordsurfacemeltingeventoccurred� overtheGrIS.� Theconcentrationsinthesurfacewere� 0.9,� 3.8,� and� 107�ppbwforEC,� OC,� anddust,� respectively,�atthebeginningoftheperiod,�whichincreasedto�4.9,�17.2,�and�1327�ppbwforEC,�OC,�anddust,� respectively,�attheend. TheECanddustconcentrationswereremarkablyhigherthanthoseatthethree� locationsin�2011�andtherecentmeasurementsatSummit. However,�ourmeasurementsforECandOC� couldbeunderestimatedbecausearecentstudyindicatesthatthecollectionefficiencyofaquartzfiber�