Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes
Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes
复制标题
大气氮沉降信号的区域变化及其向格陵兰湖泊沉积物记录的转移
DOI:
10.1002/lno.10936
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发表时间:
2018
影响因子:
4.5
通讯作者:
Anderson N
中科院分区:
文献类型:
--
作者:
Anderson N
Disruption of the nitrogen cycle is a major component of global environmental change. δ15N in lake sediments is increasingly used as a measure of reactive nitrogen input but problematically, the characteristic depleted δ15N signal is not recorded at all sites. We used a regionally replicated sampling strategy along a precipitation and N‐deposition gradient in SW Greenland to assess the factors determining the strength of δ15N signal in lake sediment cores. Analyses of snowpack N and δ15N‐NO3and water chemistry were coupled with bulk sediment δ15N. Study sites cover a gradient of snowpack δ15N (ice sheet: −6‰; coast 10‰), atmospheric N deposition (ice sheet margin: ∼ 0.2 kg ha−1yr−1; coast: 0.4 kg ha−1yr−1) and limnology. Three210Pb‐dated sediment cores from coastal lakes showed a decline in δ15N of ca. 1‰ from ∼ 1860, reflecting the strongly depleted δ15N of snowpack N, lower in‐lake total N (TN) concentration (∼ 300μg N L−1) and a higher TN‐load. Coastal lakes have 3.7–7.1× more snowpack input of nitrate than inland sites, while for total deposition the values are 1.7–3.6× greater for lake and whole catchment deposition. At inland sites and lakes close to the ice‐sheet margin, a lower atmospheric N deposition rate and larger in‐lake TN pool resulted in greater reliance on N‐fixation and recycling (mean sediment δ15N is 0.5–2.5‰ in most inland lakes;n= 6). The primary control of the transfer of the atmospheric δ15N deposition signal to lake sediments is the magnitude of external N inputs relative to the in‐lake N‐pool.
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DOI:
10.1657/aaar0015-003
发表时间:
2016-02
期刊:
Arctic, Antarctic, and Alpine Research
影响因子:
--
作者:
E. Whiteford;Suzanne McGowan;Suzanne McGowan;Christopher D. Barry;N. Anderson
通讯作者:
E. Whiteford;Suzanne McGowan;Suzanne McGowan;Christopher D. Barry;N. Anderson
DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
J. Pomeroy;T. Davies;H. G. Jones;P. Marsh;N. Peters;M. Tranter
通讯作者:
M. Tranter
影响因子:
--
作者:
J. Savarino;M. Legrand
通讯作者:
M. Legrand
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
J. Burkhart;R. Bales;J. McConnell;M. Hutterli
通讯作者:
M. Hutterli
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
T. Seastedt;W. Bowman;T. N. Caine;D. McKnight;A. Townsend;M. Williams
通讯作者:
M. Williams