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Trace Element Biogeochemistry in the High‐Latitude North Atlantic Ocean: Seasonal Variations and Volcanic Inputs
Global Biogeochemical Cycles ( IF 5.4 ) Pub Date : 2020-11-25 , DOI: 10.1029/2020gb006674
Eric P. Achterberg 1, 2 , Sebastian Steigenberger 1, 3 , Jessica K. Klar 4 , Thomas J. Browning 2 , Chris M. Marsay 5 , Stuart C. Painter 3 , Lúcia H. Vieira 2 , Alex R. Baker 6 , Douglas S. Hamilton 7 , Toste Tanhua 2 , C. Mark Moore 1
Affiliation  

We present dissolved and total dissolvable trace elements for spring and summer cruises in 2010 in the high‐latitude North Atlantic. Surface and full depth data are provided for Al, Cd, Co, Cu, Mn, Ni, Pb, and Zn in the Iceland and Irminger Basins, and consequences of biological uptake and inputs by the spring Eyjafjallajökull volcanic eruption are assessed. Ash from Eyjafjallajökull resulted in pronounced increases in Al, Mn, and Zn in surface waters in close proximity to Iceland during the eruption, while 3 months later during the summer cruise levels had returned to more typical values for the region. The apparent seasonal removal ratios of surface trace elements were consistent with biological export. Assessment of supply of trace elements to the surface mixed layer for the region, excluding volcanic inputs, indicated that deep winter mixing was the dominant source, with diffusive mixing being a minor source (between 13.5% [dissolved Cd, DCd] and −2.43% [DZn] of deep winter flux), and atmospheric inputs being an important source only for DAl and DZn (DAl up to 42% and DZn up to 4.2% of deep winter + diffusive fluxes) and typically less than 1% for the other elements. Elemental supply ratios to the surface mixed layer through convection were comparable to apparent removal ratios we calculated between spring and summer. Given that deep mixing dominated nutrient and trace element supply to surface waters, predicted increases in water column stratification in this region may reduce supply, with potential consequences for primary production and the biological carbon pump.

中文翻译:

高纬度北大西洋的微量元素生物地球化学:季节变化和火山输入

我们介绍了高纬度北大西洋在2010年春季和夏季航行中溶解的和全部可溶解的痕量元素。提供了冰岛和艾明格河流域的Al,Cd,Co,Cu,Mn,Ni,Pb和Zn的表面和全深度数据,并对春季Eyjafjallajökull火山喷发的生物吸收和输入的后果进行了评估。火山喷发期间,来自埃亚菲亚德拉冰窟的灰烬导致靠近冰岛的地表水中的铝,锰和锌显着增加,而3个月后的夏季,该区域的巡航水平又恢复了正常水平。表面微量元素的表观季节性去除率与生物出口量一致。评估该地区地表混合层中微量元素的供应,不包括火山输入,表明冬季深层混合是主要来源,扩散混合是次要来源(介于深冬季通量的13.5%[溶解的Cd,DCd]和-2.43%[DZn]之间),而大气输入仅是DAl的重要来源和DZn(DAl高达深冬季的42%,DZn高达冬季的4.2%+扩散通量),其他元素通常小于1%。通过对流到表面混合层的元素供应比与我们在春季和夏季之间计算得出的表观去除比相当。考虑到向地表水中的营养和微量元素的深度混合占主导地位,预计该区域水柱分层的增加可能会减少供应,这会对初级生产和生物碳泵产生潜在的影响。5%[溶解的Cd,DCd]和-2.43%[DZn]的冬季深通量),而大气输入仅是DAl和DZn的重要来源(DAl高达深冬季的42%,DZn高达深冬季的4.2%+扩散性(通量),其他元素通常小于1%。通过对流到表面混合层的元素供应率可与我们在春季和夏季之间计算得出的表观去除率相媲美。考虑到向地表水中的营养和微量元素供应主要是深度混合,因此该区域水柱分层的预期增加可能会减少供应,这会对初级生产和生物碳泵产生潜在的后果。5%[溶解的Cd,DCd]和-2.43%[DZn]的冬季深通量),而大气输入仅是DAl和DZn的重要来源(DAl高达深冬季的42%,DZn高达深冬季的4.2%+扩散性(通量),其他元素通常小于1%。通过对流到表面混合层的元素供应比与我们在春季和夏季之间计算得出的表观去除比相当。考虑到向地表水中的营养和微量元素的深度混合占主导地位,预计该区域水柱分层的增加可能会减少供应,这会对初级生产和生物碳泵产生潜在的影响。深冬季的2%+扩散通量),其他元素通常小于1%。通过对流到表面混合层的元素供应比与我们在春季和夏季之间计算得出的表观去除比相当。考虑到向地表水中的营养和微量元素的深度混合占主导地位,预计该区域水柱分层的增加可能会减少供应,这会对初级生产和生物碳泵产生潜在的影响。深冬季的2%+扩散通量),其他元素通常小于1%。通过对流到表面混合层的元素供应比与我们在春季和夏季之间计算得出的表观去除比相当。考虑到向地表水中的营养和微量元素的深度混合占主导地位,预计该区域水柱分层的增加可能会减少供应,这会对初级生产和生物碳泵产生潜在的影响。
更新日期:2020-11-25
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