气候变化领域集成服务门户(CCPortal): Ice content, DOC storage and annual permafrost eroding in the Arctic Ocean

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.868914
	Ice content, DOC storage and annual permafrost eroding in the Arctic Ocean
	Tanski; George; Couture; Nicole; Lantuit; Hugues; Eulenburg; Antje; Fritz; Michael
发布日期	2016-11-29
数据集类型	dataset
英文简介	Ice-rich permafrost coasts in the Arctic are highly sensitive to climate warming and erode at a pace that exceeds the global average. Permafrost coasts deliver vast amounts of organic carbon into the nearshore zone of the Arctic Ocean. Numbers on flux exist for particulate organic carbon (POC) and total or soil organic carbon (TOC, SOC). However, they do not exist for dissolved organic carbon (DOC), which is known to be highly bioavailable. This study aims to estimate DOC stocks in coastal permafrost as well as the annual flux into the ocean. DOC concentrations in ground ice were analyzed along the ice-rich Yukon coast (YC) in the western Canadian Arctic. The annual DOC flux was estimated using available numbers for coast length, cliff height, annual erosion rate, and volumetric ice content in different stratigraphic horizons. Our results showed that DOC concentrations in ground ice range between 0.3 and 347.0 mg/l with an estimated stock of 13.6 ± 3.0 g/m**3 along the YC. An annual DOC flux of 54.9 ± 0.9 Mg/yr was computed. These DOC fluxes are low compared to POC and SOC fluxes from coastal erosion or POC and DOC fluxes from Arctic rivers. We conclude that DOC fluxes from permafrost coasts play a secondary role in the Arctic carbon budget. However, this DOC is assumed to be highly bioavailable. We hypothesize that DOC from coastal erosion is important for ecosystems in the Arctic nearshore zones, particularly in summer when river discharge is low, and in areas where rivers are absent.
空间范围	Median Latitude: 69.342629 * Median Longitude: -138.749020 * South-bound Latitude: 68.880290 * West-bound Longitude: -140.947110 * North-bound Latitude: 69.618900 * East-bound Longitude: -136.494900
时间范围	2013-06-23T00:00:00 - 2013-08-03T00:00:00
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/215366
推荐引用方式 GB/T 7714	Tanski,George,Couture,et al. Ice content, DOC storage and annual permafrost eroding in the Arctic Ocean.2016-11-29.https://doi.org/10.1594/PANGAEA.868914.