气候变化领域集成服务门户(CCPortal): Dissolved organic carbon (DOC) in Arctic ground ice, from northwest Canada, east Siberia, and Alaska

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.846074
	Dissolved organic carbon (DOC) in Arctic ground ice, from northwest Canada, east Siberia, and Alaska
	Fritz; Michael; Opel; Thomas; Tanski; George; Herzschuh; Ulrike; Meyer; Hanno; Eulenburg; Antje; Lantuit; Hugues
发布日期	2015-05-08
数据集类型	dataset
英文简介	Thermal permafrost degradation and coastal erosion in the Arctic remobilize substantial amounts of organic carbon (OC) and nutrients which have accumulated in late Pleistocene and Holocene unconsolidated deposits. Permafrost vulnerability to thaw subsidence, collapsing coastlines and irreversible landscape change are largely due to the presence of large amounts of massive ground ice such as ice wedges. However, ground ice has not, until now, been considered to be a source of dissolved organic carbon (DOC), dissolved inorganic carbon (DIC) and other elements which are important for ecosystems and carbon cycling. Here we show, using biogeochemical data from a large number of different ice bodies throughout the Arctic, that ice wedges have the greatest potential for DOC storage, with a maximum of 28.6 mg/L (mean: 9.6 mg/L). Variation in DOC concentration is positively correlated with and explained by the concentrations and relative amounts of typically terrestrial cations such as Mg2+ and K+. DOC sequestration into ground ice was more effective during the late Pleistocene than during the Holocene, which can be explained by rapid sediment and OC accumulation, the prevalence of more easily degradable vegetation and immediate incorporation into permafrost. We assume that pristine snowmelt is able to leach considerable amounts of well-preserved and highly bioavailable DOC as well as other elements from surface sediments, which are rapidly frozen and stored in ground ice, especially in ice wedges, even before further degradation. We found that ice wedges in the Yedoma region represent a significant DOC (45.2 Tg) and DIC (33.6 Tg) pool in permafrost areas and a freshwater reservoir of 4200 km**3. This study underlines the need to discriminate between particulate OC and DOC to assess the availability and vulnerability of the permafrost carbon pool for ecosystems and climate feedback upon mobilization.
空间范围	Median Latitude: 70.403801 * Median Longitude: -172.285792 * South-bound Latitude: 65.030000 * West-bound Longitude: 117.170000 * North-bound Latitude: 73.600000 * East-bound Longitude: -138.318340
时间范围	2007-08-22T00:00:00 - 2007-08-22T00:00:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/217111
推荐引用方式 GB/T 7714	Fritz,Michael,Opel,et al. Dissolved organic carbon (DOC) in Arctic ground ice, from northwest Canada, east Siberia, and Alaska.2015-05-08.https://doi.org/10.1594/PANGAEA.846074.