Citation:

ngeo2349

Name: (Table S1) Radiocarbon dates of organic matter from Lena Delta ice wedges
Published: 2015-01-30
License: https://creativecommons.org/licenses/by/3.0/
Keywords: organic matter; radiocarbon; river delta

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Abstract:

Relative to the past 2,000 years, the Arctic region has warmed significantly over the past few decades. However, the evolution of Arctic temperatures during the rest of the Holocene is less clear. Proxy reconstructions, suggest a long-term cooling trend throughout the mid- to late Holocene, whereas climate model simulations show only minor changes or even warming. Here we present a record of the oxygen isotope composition of permafrost ice wedges from the Lena River Delta in the Siberian Arctic. The isotope values, which reflect winter season temperatures, became progressively more enriched over the past 7,000 years, reaching unprecedented levels in the past five decades. This warming trend during the mid- to late Holocene is in opposition to the cooling seen in other proxy records. However, most of these existing proxy records are biased towards summer temperatures. We argue that the opposing trends are related to the seasonally different orbital forcing over this interval. Furthermore, our reconstructed trend as well as the recent maximum are consistent with the greenhouse gas forcing and climate model simulations, thus reconciling differing estimates of Arctic and northern high-latitude temperature evolution during the Holocene.

Keyword(s):

organic matter; radiocarbon; river delta

Project(s):

Permafrost Research (Periglacial Dynamics) @ AWI (AWI_PerDyn)

Coverage:

Latitude: 72.376480 * Longitude: 126.489230

Minimum ORDINAL NUMBER: 1 * Maximum ORDINAL NUMBER: 42

Event(s):

Samoylov_Island * Latitude: 72.376480 * Longitude: 126.489230 * Elevation: 8.0 m * Location: Samoylov Island, Lena Delta, Siberia * Method/Device: Multiple investigations (MULT)

Comment:

The study area is situated in the central part of the Lena River Delta (72°00'-72°45'N and 125°00'-127°15'E) in Northern Siberia. In this area two (out of three) river terraces were sampled:

(1) the first Lena River terrace comprising the active part of the delta, which was formed from mid Holocene to present.

(2) the third Lena River terrace, where the work focused on Holocene cover deposits above the Ice Complex with a height of ca. 25 m.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	ORDINAL NUMBER	Ord No				Geocode
2	Sample ID	Sample ID		Meyer, Hanno
3	Site	Site		Meyer, Hanno		Ice wedge site
4	Sample code/label	Sample label		Meyer, Hanno
5	Age, dated	Age dated	ka	Meyer, Hanno	Age, 14C AMS	b2K = 2000 AD
6	Age, dated standard deviation	Age dated std dev	±	Meyer, Hanno
7	Age, dated	Age dated	ka	Meyer, Hanno	Age, 14C calibrated, IntCal13 (Reimer et al., 2013)	b2K = 2000 AD; Calibrated age midpoint of the highest posterior density (hpd)
8	Age, dated standard deviation	Age dated std dev	±	Meyer, Hanno
9	Probability	Prob	%	Meyer, Hanno	Calculated
10	δ18O	δ18O	‰	Meyer, Hanno	Mass spectrometer Finnigan Delta-S	VSMOW; d18O values marked with # have been excluded from the stacked isotope record
11	Lithologic unit/sequence	Unit		Meyer, Hanno
12	Age, dated material	Dated material		Meyer, Hanno

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

460 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Ord No	2 Sample ID	3 Site (Ice wedge site)	4 Sample label	5 Age dated [ka] (b2K = 2000 AD, Age, 14C AMS)	6 Age dated std dev [±]	7 Age dated [ka] (b2K = 2000 AD; Calibrated age...)	8 Age dated std dev [±]	9 Prob [%] (Calculated)	10 δ18O [‰] (VSMOW; d18O values marked wit...)	11 Unit	12 Dated material
1	LD05-IW-1.16	1	KIA33163	<-0.004	0.000	0.025	0.010		-22.46	Lena river terrace	lemming pellet
2	LD10-IW-13.13	2	COL1725	<-0.004	0.000	0.023	0.010		-21.26	Top Ice Complex	plant remains
3	LD05-IW-11.10	3	KIA29851	0.220	0.025	0.218	0.020	40.3	-24.95	Top Ice Complex	plant remains
4	LD05-IW-7.11	4	KIA29847	0.183	0.042	0.230	0.050	47.0	#-22.76	Lena river terrace	peat
5	LD05-IW-12.19	5	KIA29852	0.297	0.039	0.429	0.091	95.0	-24.90	Lena river terrace	peat
6	LD05-IW-7.1-I15/16	4	COL1067	0.287	0.034	0.454	0.056	62.1	-24.04	Lena river terrace	sphagnum, wood
7	LD05-IW-1.2-I5	1	COL1061	0.388	0.053	0.516	0.048	54.0	-23.55	Lena river terrace	sphagnum, leaves
8	LD10-IW-15.15	6	COL1351	0.389	0.030	0.518	0.041	68.6	-24.85	Lena river terrace	plant remains
9	LD05-IW-1.18	1	KIA33162	0.416	0.031	0.527	0.044	85.0	-24.20	Lena river terrace	plant remains
10	LD05-IW-1.20	1	KIA33161	0.834	0.036	0.789	0.057	92.2	-23.90	Lena river terrace	plant remains
11	LD05-IW-10.8	7	KIA29850	0.965	0.026	0.885	0.039	59.9	-23.59	Lena river terrace	peat
12	LD05-IW-9.12	8	KIA33167	1.011	0.024	0.988	0.030	92.2	-23.42	Lena river terrace	plant remains
13	LD05-IW-5.4-I10/11	9	COL1066	1.060	0.038	1.019	0.044	75.7	-25.31	Lena river terrace	sphagnum
14	LD05-IW-10.14	7	KIA33169	1.105	0.026	1.060	0.052	95.0	-23.43	Lena river terrace	plant remains
15	LD05-IW-7.29	4	KIA36116	1.075	0.074	1.089	0.139	88.6	-24.51	Lena river terrace	plant remains
16	LD05-IW-13.9	10	KIA36120	1.159	0.070	1.120	0.117	85.2	-25.11	Lena river terrace	plant remains
17	LD05-IW-1.4-I2	1	COL1062	1.164	0.034	1.160	0.068	73.9	-24.89	Lena river terrace	sphagnum
18	LD05-IW-1.11	1	KIA29843	1.307	0.030	1.308	0.034	66.5	-23.87	Lena river terrace	plant remains
19	LD05-IW-5.12	9	KIA36114	1.405	0.066	1.370	0.095	88.9	-24.14	Lena river terrace	plant remains
20	LD05-IW-12.9	5	KIA36119	1.561	0.035	1.506	0.077	95.0	-25.04	Lena river terrace	plant remains
21	LD05-IW-1.21	1	COL1345	1.676	0.072	1.621	0.167	94.2	-23.47	Lena river terrace	plant remains
22	LD05-IW-9.6	8	KIA33166	1.666	0.034	1.625	0.054	84.9	-23.52	Lena river terrace	plant remains
23	LD10-IW-15.2	6	COL1726	1.689	0.046	1.667	0.095	93.9	-25.49	Lena river terrace	plant remains
24	LD05-IW-5.1-I8+I9	9	COL1064	1.739	0.037	1.692	0.087	95.0	-24.45	Lena river terrace	sphagnum
25	LD05-IW-7.23	4	KIA36115	1.749	0.067	1.728	0.146	95.0	-24.93	Lena river terrace	plant remains
26	LD05-IW-1.27	1	KIA36113	2.019	0.038	2.024	0.088	92.4	-24.44	Lena river terrace	plant remains
27	LD05-IW-7.15	4	COL1731	2.053	0.042	2.074	0.101	93.6	-24.45	Lena river terrace	plant remains
28	LD05-IW-9.4	8	KIA29849	2.080	0.033	2.114	0.078	92.5	-24.87	Lena river terrace	peat
29	LD10-IW-13.9	2	COL1350	2.083	0.032	2.116	0.078	94.1	#-21.04	Top Ice Complex	plant remains, wood
30	LD05-IW-1.22	1	KIA29844	2.126	0.095	2.178	0.205	94.2	-23.04	Lena river terrace	peat
31	LD05-IW-1.3-I5	1	COL1730	2.201	0.044	2.275	0.108	95.0	-23.58	Lena river terrace	plant remains
32	LD05-IW-12.5	5	KIA33168	2.623	0.018	2.804	0.024	95.0	-25.27	Lena river terrace	plant remains
33	LD05-IW-5.13	9	KIA33164	3.000	0.062	3.228	0.174	95.0	-24.93	Lena river terrace	peat
34	LD05-IW-11.5	3	KIA36118	3.014	0.035	3.252	0.067	69.4	-25.85	Top Ice Complex	plant remains
35	LD05-IW-5.16	9	KIA29845	3.630	0.084	3.980	0.225	94.5	-24.81	Lena river terrace	peat
36	LD05-IW-8.6	11	KIA29848	4.107	0.041	4.674	0.104	69.9	-25.98	Lena river terrace	peat
37	LD05-IW-8.7	11	KIA36117	5.178	0.033	5.996	0.047	95.0	-25.88	Lena river terrace	plant remains
38	LD05-IW-8.1-I11/12	11	COL1068	5.211	0.042	6.014	0.060	83.1	-26.53	Lena river terrace	sphagnum
39	LD05-IW-8.2-AK2	11	COL1069	5.273	0.038	6.104	0.074	64.8	-28.18	Lena river terrace	wood
40	LD05-IW-8.9	11	KIA33165	5.332	0.044	6.154	0.110	89.9	-26.76	Lena river terrace	plant remains
41	LD10-IW-12.29	12	COL1724	5.437	0.050	6.296	0.071	87.6	-25.26	Top Ice Complex	plant remains
42	LD05-IW-3-I33	13	COL1063	6.336	0.044	7.300	0.082	87.4	-25.82	Lena river terrace	sphagnum