Formate and acetate as recorded in a mid-latitude glacier in west China  

作　　者：LIXinqing QINDahe ZHANGCaili ZHOUHui JIAOKeqin 

机构地区：[1]NationalLaboratoryofWesternChina'sEnvironmentalSystems,MOE,LanzhouUniversity,Lanzhou730000.China: [2]LaboratoryofIceCoreantiColdRegionsEnvironment,ColdandAridegionsEnvironmentalandEngineeringResearchInstitute,ChineseAcademyofSciences,Lanzhou730000,China [3]SchoolofEconomicsandManagement,LanzhouUniversity,Lanzhou730000,China

出　　处：《Chinese Science Bulletin》2003年第14期1483-1487,共5页

基　　金：This work was joint-supported by the National Natural Science Foundation of China(Grant No.40073035);Chinese Academy of Sciences(Grant No.CAS 2002-43);Tianshan Glaciological Station.

摘　　要：Formate and acetate are ubiquitous in the troposphere. Their occurrence is closely related to processes in the biosphere and contributes to an understanding of carbon biogeochemical cycles. A 43-year record of formate and acetate in an ice core from Glacier 1 (43?6′N, 86?9′E) at Urumqi river head, Tianshan, west China was investigated. Fluctuating between 22.7 ng·g-1 and 2830.7 ng·g-1, acetate concentration averages 373.2 ?376.1 ng·g-1 (mean ?1s, N = 541) and is the highest anion in the record. Next to acetate, the concentration for formate varies between 2.1 ng·g-1 and 795.5 ng·g-1 and averages 61.1 ?89.0 ng·g-1 (N = 541). The formate to acetate ratio averages 0.22 ?0.25 (N = 541), indicating that the chief source is from fossil fuel combustion, coal burning in particular. The two species co-varied in the past four decades and exhibited periods of high concentration from the early 1960s to the middle of 1970s and from the early 1980s to the middle of 1990s, separated by a time of the lower concentration between 1975—1980. These variations may reflect the local/regional anthropogenic pollution to the atmosphere as well as the economic development of northwestern China.Formate and acetate are ubiquitous in the troposphere. Their occurrence is closely related to processes in the biosphere and contributes to an understanding of carbon biogeochemical cycles. A 43-year record of formate and acetate in an ice core from Glacier 1 (43?6′N, 86?9′E) at Urumqi river head, Tianshan, west China was investigated. Fluctuating between 22.7 ng·g-1 and 2830.7 ng·g-1, acetate concentration averages 373.2 ?376.1 ng·g-1 (mean ?1s, N = 541) and is the highest anion in the record. Next to acetate, the concentration for formate varies between 2.1 ng·g-1 and 795.5 ng·g-1 and averages 61.1 ?89.0 ng·g-1 (N = 541). The formate to acetate ratio averages 0.22 ?0.25 (N = 541), indicating that the chief source is from fossil fuel combustion, coal burning in particular. The two species co-varied in the past four decades and exhibited periods of high concentration from the early 1960s to the middle of 1970s and from the early 1980s to the middle of 1990s, separated by a time of the lower concentration between 1975—1980. These variations may reflect the local/regional anthropogenic pollution to the atmosphere as well as the economic development of northwestern China.

关 键 词：中纬度冰川 中国西部 天山 甲酸 醋酸 大气污染 大气监测 

分 类 号：X831[环境科学与工程—环境工程]