Dissolved organic carbon, major and trace element in peat pore water of sporadic, discontinuous and continuous permafrost zone of Western Siberia

• DOI: 10.5194/bg-2017-24
• Publication Date: 2017-02-02T13:50:13Z
• Authors: Tatiana V. Raudina; Sergey V. Loiko; Artyom Lim; Ivan V. Krickov; Liudmila S. Shiro...; Georgy I. Istigechev; Daria M. Kuzmina; Sergey P. Kulizhsky; Sergey N. Vorobyev; Oleg S. Pokrovsky
• Keywords: Soil carbon

Abstract. Mobilization of dissolved organic carbon (DOC) and related trace elements (TE) from the frozen peat to surface waters in permafrost zone is one major consequence on-going thaw active layer thickness (ALT) rise high latitude regions. The interstitial soil solutions are efficient tracers bio-geochemical processes critical can help decipher intensity metals migration rivers further ocean. To this end, we collected, across a 640 km latitudinal transect sporadic continuous western Siberia peatlands, porewaters 30 cm depth using suction cups analyzed DOC, DIC 40 TE 0.45 µm filtered fraction 80 porewaters. Despite an expected decrease DOC mobilization vegetation litter fluids with increase coverage, annual temperature ALT, many element did not exhibit any distinct concentration along 62.2° N 67.4° N. demonstrated maximum at 66° N, on border discontinuous/continuous zone, whereas was equal or higher than that sporadic/discontinuous zone. Moreover, number (Ca, Mg) (Al, Ti, Sr, Ga, REEs, Zr, Hf, Th) exhibited increasing, decreasing northward trend. We hypothesize effect ALT secondary importance relative leaching capacity which turn controlled by water saturation core. residence time pores also plays role enriching some elements: V, Cu, Pb, REE, Th were factor 1.5 2.0 mounds hollows. As such, it possible reaction between downward infiltrating essentially controls degree pore-water enrichments other solutes. A two-degree shift position boundaries may bring about 1.3 Ca, Mg, Al, Fe, Mn, Ni, Co, REE porewater discontinuous zones, SUVA, Fe Sr will exceed 20 % their actual values. projected density, boundary, change hydrological regime unlikely modify chemical composition pore larger natural variations within different micro-landscapes, i.e., 2.