Meire Lorenz, Paulsen Maria Lund, Meire Patrick, Rysgaard Søren, Hopwood Mark James, Sejr Mikael Kristian, Stuart-Lee Alice, Sabbe Koen, Stock Willem, Mortensen John
Royal Netherlands Institute for Sea Research, Department of Estuarine and Delta Systems, Yerseke, the Netherlands.
Greenland Climate Research Centre, Greenland Institute of Natural Resources, Nuuk, Greenland.
Nat Geosci. 2023;16(8):671-674. doi: 10.1038/s41561-023-01218-y. Epub 2023 Jun 29.
The melting of the Greenland Ice Sheet is accelerating, with glaciers shifting from marine to land termination and potential consequences for fjord ecosystems downstream. Monthly samples in 2016 in two fjords in southwest Greenland show that subglacial discharge from marine-terminating glaciers sustains high phytoplankton productivity that is dominated by diatoms and grazed by larger mesozooplankton throughout summer. In contrast, melting of land-terminating glaciers results in a fjord ecosystem dominated by bacteria, picophytoplankton and smaller zooplankton, which has only one-third of the annual productivity and half the CO uptake compared to the fjord downstream from marine-terminating glaciers.
格陵兰冰盖的融化正在加速，冰川正从海洋末端向陆地末端转变，这对下游峡湾生态系统可能产生影响。2016年对格陵兰西南部两个峡湾进行的月度采样显示，海洋末端冰川的冰下排放维持了较高的浮游植物生产力，整个夏季以硅藻为主导，并受到较大中型浮游动物的捕食。相比之下，陆地末端冰川的融化导致峡湾生态系统以细菌、微微型浮游植物和较小的浮游动物为主，其年生产力仅为海洋末端冰川下游峡湾的三分之一，二氧化碳吸收量为其一半。
