Citation:

PANGAEA.974694 (dataset in review)

Name: Post 1986 lake sediment carbon accumulation from 213 lakes in Finland and lake catchment land use
License: https://creativecommons.org/licenses/by/4.0/
Keywords: catchment-level drivers; human impact; lacustrine sediments; Sediment carbon

Abstract:

Dataset contains lake sediment accumulation data from 213 different lakes in boreal Finland that can be used to calculate modern carbon (post 1986) sediment accumulation rates. Sediments have been collected between the years 2005 and 2016 using Kajak and Limnos type sediment core samplers. Sampling depth was recorded using a hand held or hull attached depth echo sounder. After collection, sediment has been sliced to samples primarily in 1 cm intervals ( n = 180), but in some cases (n = 35) compound samples of 2-6 cm have been used and one core has been sliced with 0.5 cm interval. Sediment weight has been measured when wet and after being dried in a low temperature (95 °C) oven. Topmost two centimeters of the sediment core data have been eliminated from the data set to reduce the chance of sediment mixing and biological processes affecting carbon accumulation calculations.

Sediment have been dated using the fallout of 1986 Chernobyl nuclear event derived 137Cs activity. Cs activity was measured by gamma spectrometers: An EG&G Ortec ACE™-2K (GTK, Finland) equipped with a four-inch NaI/TI detector, and a BrightSpec bMCA-USB pulse height analyzer (GTK, Finland) together with a well-type NaI(Tl) detector. Highest activity is interpreted as the 1986 age. The carbon and nitrogen concentration measurements have been measured using Elementar Vario Max CN-analyzer (Labtium, Finland). C:N ratios have been calculated as molar ratios.

Included in the dataset are lake basic lake morphometric features such as lake size, elevation from sea level, shoreline length and mean depth from National Land Survey of Finland and Finnish Environment institute databases. Catchment data includes the size of the catchment and the land use coverage percentages obtained using the Finnish Environment Instutes VALUE catchment delineation tool. The extent of ditch drainage networks within individual catchments was isolated from National Land Survey of Finland data, and the area of ditch drainage was calculated using 40 meter spatial buffer from the ditches in ArcGIS Pro.

Spatial coverage: Sediment sampling locations are located within the area 60,096 - 64,965 °N and 22,349 - 28,84 °E (decimal degrees, WGS84).

Keyword(s):

catchment-level drivers; human impact; lacustrine sediments; Sediment carbon

Coverage:

Median Latitude: 26.845046 * Median Longitude: 62.886400 * South-bound Latitude: 22.349000 * West-bound Longitude: 60.096000 * North-bound Latitude: 28.839000 * East-bound Longitude: 64.964000

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Lake	Lake		Junna, Tuomas	Lake name
2	Municipality	Municipality		Junna, Tuomas
3	Station label	Station		Junna, Tuomas	Coring station ID
4	LATITUDE	Latitude		Junna, Tuomas	Geocode – ESPG 4326 decimal degrees
5	LONGITUDE	Longitude		Junna, Tuomas	Geocode – ESPG 4326 decimal degrees
6	Lake surface area	Lake area	ha	Junna, Tuomas
7	Shoreline length	Shoreline len	m	Junna, Tuomas
8	Island area	Island area	m²	Junna, Tuomas	Island surface area within lake
9	ELEVATION	Elevation	m a.s.l.	Junna, Tuomas	Geocode
10	Lake, water depth	Lake water depth	m	Junna, Tuomas	Sediment core retrieval depth
11	Lake, water depth, mean	Lake water d mean	m	Junna, Tuomas
12	Catchment area	Catch area	km²	Junna, Tuomas
13	Catchment/lake area ratio	Catchment/lake area	km²/m²	Junna, Tuomas
14	Drained area	Drained area	km²	Junna, Tuomas	Area of ditch drained land in the catchment
15	Catchment/drained area ratio	Catchment/drained area		Junna, Tuomas	Catchment area/Ditch drained area within catchment ratio
16	Land cover, agriculture	LC agri	%	Junna, Tuomas	Coverage of agricultural land within catchment
17	Land cover, water bodies	LC water bodies	%	Junna, Tuomas	Coverage of inland waterbodies within catchment
18	Land cover, wetlands	LC wetlands	%	Junna, Tuomas	Coverage of inland wetlands within catchment
19	Land cover, rocky barrens	LC rocky barrens	%	Junna, Tuomas	Coverage of rocky barrens within catchment
20	Land cover, forest	LC forest	%	Junna, Tuomas	Coverage of forested land within catchment
21	Land cover, buildings	LC build	%	Junna, Tuomas	Coverage of all built land area within catchment
22	Year of sampling	Year sampl		Junna, Tuomas	Sediment core retrieval year
23	Caesium-137	137Cs	Bq/kg	Junna, Tuomas
24	DEPTH, sediment/rock	Depth sed	m	Junna, Tuomas	Geocode – Bottom depth in core of highest Cs activity
25	Depth, top/min	Depth top	m	Junna, Tuomas	Sediment sample top core depth
26	Depth, bottom/max	Depth bot	m	Junna, Tuomas	Sediment sample bottom core depth
27	Wet mass	Wet m	g	Junna, Tuomas	Sediment sample wet weight
28	Dry mass	Dry m	g	Junna, Tuomas	Sediment sample dry weight
29	Carbon	C	%	Junna, Tuomas
30	Carbon	C	%	Junna, Tuomas	nearest neighbour
31	Nitrogen	N	%	Junna, Tuomas
32	Nitrogen	N	%	Junna, Tuomas	nearest neighbour
33	Carbon/Nitrogen ratio	C/N	mol/mol	Junna, Tuomas	Post 1986 mean C/N ratio
34	Carbon	C	%	Junna, Tuomas	Post 1986 mean C content
35	Sedimentation rate per year	SR	cm/a	Junna, Tuomas	Post 1986 sedimentation rate
36	Accumulation rate per year	Acc rate	g/cm²/a	Junna, Tuomas	Post 1986 sediment mass accumulation rate
37	Accumulation rate, carbon, organic	Acc rate C org	g/cm²/a	Junna, Tuomas	Post 1986 sediment carbon accumulation rate

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)

Status:

Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 4 (ProcLevel4)

Size:

32691 data points

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