Continued glacial retreat linked to changing macronutrient supply along the West Antarctic Peninsula
Continued glacial retreat linked to changing macronutrient supply along the West Antarctic Peninsula
复制标题
冰川持续退缩与西南极半岛常量营养素供应变化有关
DOI：
10.1016/j.marchem.2023.104230
复制
发表时间：
2023
期刊：
影响因子：
3
通讯作者：
Jones R
中科院分区：
文献类型：
--
作者：
Jones R
在西南极半岛，大气和海洋持续变暖正在给冰川和海洋环境造成重大的物理和地球化学变化。我们比较了沉积物来源和驱动程序的宏量营养素分布在两个海湾沿着WAP在2020年夏季，使用放射性镭和稳定氧同位素跟踪沉积的影响，并量化不同的淡水输入。在莱德湾，那里的谢尔顿冰川是海洋终止，镭活动在沉积物-水界面表明相当大的底栖混合。使用镭同位素活度梯度来解析镭和常量营养素通量，我们发现冰川附近的浮力融水驱动了沉积物的剧烈混合和常量营养素深层沃茨的夹带，硝酸盐的数量级为2.0 × 105 mol d− 1。相反，在福卡德冰川终止于陆地的玛丽安湾，低盐度和氧同位素表明，融水丰富的表层厚度小于1米，沉积物丰富，与海底的垂直混合强烈。沿沿着WAP向陆地终止冰川的持续转移可能对真光层的营养和沉积物供应产生重大影响，并对初级生产力和碳吸收效率产生影响。因此，初级生产、碳吸收和食物网动态的未来与WAP沿着许多峡湾的冰川退缩动态有关。
At the West Antarctic Peninsula (WAP), continued atmospheric and oceanic warming is causing significant physical and biogeochemical changes to glaciers and the marine environment. We compare sediment sources and drivers of macronutrient distributions at two bays along the WAP during austral summer 2020, using radioactive radium and stable oxygen isotopes to trace sedimentary influences and quantify different freshwater inputs. In the Ryder Bay, where the Sheldon Glacier is marine-terminating, radium activities at the sediment-water interface indicate considerable benthic mixing. Using radium isotope activity gradients to resolve radium and macronutrient fluxes, we find buoyant meltwater proximal to the glacier drives vigorous mixing of sediment and entrainment of macronutrient deep waters, on the order of 2.0 × 105mol d−1for nitrate. Conversely, in the Marian Cove, where the Fourcade Glacier terminates on land, low salinities and oxygen isotopes indicate a meltwater-rich surface layer <1 m thick and rich in sediment, and strong vertical mixing to the seafloor. A continued shift to land-terminating glaciers along the WAP may have a significant impact upon nutrient and sediment supply to the euphotic zone, with impacts upon primary productivity and carbon uptake efficiency. The future of primary production, carbon uptake, and food web dynamics is therefore linked to glacier retreat dynamics in the many fjords along the WAP.
登录
查看更多内容
影响因子：
3.7
作者：
Becker, Susan;Aoyama, Michio;Tanhua, Toste
通讯作者：
Tanhua, Toste
氧 18 和氦作为威德尔海冰架水和水/冰相互作用的示踪剂
影响因子：
--
作者：
P. Schlosser;R. Bayer;A. Foldvik;T. Gammelsrød;G. Rohardt;K. Münnich
通讯作者：
K. Münnich
南极峡湾浮游植物分类组成的环境驱动因素
影响因子：
4.1
作者：
B. Pan;M. Vernet;Lauren E. Manck;K. Forsch;L. Ekern;Martina Mascioni;K. Barbeau;G. O. Almandoz;Alexander J. Orona
通讯作者：
Alexander J. Orona
影响因子：
3.7
作者：
Hoffmann, Ralf;Al-Handal, Adil Yousif;Braeckman, Ulrike
通讯作者：
Braeckman, Ulrike
DOI：
10.1098/rsta.2017.0164
发表时间：
2018-06-28
期刊：
Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
影响因子：
--
作者：
Moffat C;Meredith M
通讯作者：
Meredith M