Citation:

2017JC013524

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Abstract:

Large gradients and inter annual variations on the Laptev Sea shelf prevent the use of uniform property ranges for a classification of major water masses. The central Laptev Sea is dominated by predominantly marine waters, locally formed polynya waters and riverine summer surface waters. Marine waters enter the central Laptev Sea from the northwestern Laptev Sea shelf and originate from the Kara Sea or the Arctic Ocean halocline. Local polynya waters are formed in the Laptev Sea coastal polynyas. Riverine summer surface waters are formed from Lena river discharge and local melt. We use a principal component analysis (PCA) in order to assess the distribution and importance of water masses within the Laptev Sea. This mathematical method is applied to hydro‐chemical summer data sets from the Laptev Sea from five years and allows to define water types based on objective and statistically significant criteria. We argue that the PCA‐derived water types are consistent with the Laptev Sea hydrography and indeed represent the major water masses on the central Laptev Sea shelf. Budgets estimated for the thus defined major Laptev Sea water masses indicate that freshwater inflow from the western Laptev Sea is about half or in the same order of magnitude as freshwater stored in locally formed polynya waters. Imported water dominates the nutrient budget in the central Laptev Sea; and only in years with enhanced local polynya activity is the nutrient budget of the locally formed water in the same order as imported nutrients.

Project(s):

Laptev Sea System (LSS)

Coverage:

Median Latitude: 75.912707 * Median Longitude: 124.937759 * South-bound Latitude: 71.502700 * West-bound Longitude: 97.065000 * North-bound Latitude: 79.750000 * East-bound Longitude: 143.022000

Date/Time Start: 1994-09-04T00:00:00 * Date/Time End: 2014-09-27T00:00:00

Minimum DEPTH, water: 0.00 m * Maximum DEPTH, water: 375.00 m

Event(s):

IP07-2_1 * Latitude: 72.499680 * Longitude: 131.023000 * Date/Time: 2007-08-29T15:10:00 * Elevation: -18.5 m * Campaign: (TD07) * Basis: Ivan Petrov * Method/Device: (CTD-RO)

IP07-2_1-1L * Latitude: 75.831180 * Longitude: 125.995280 * Date/Time: 2007-09-12T07:19:00 * Elevation: -44.0 m * Campaign: (TD07) * Basis: Ivan Petrov * Method/Device: (CTD-RO)

IP07-2_1-1P * Latitude: 74.334380 * Longitude: 123.001300 * Date/Time: 2007-09-03T21:05:00 * Elevation: -13.3 m * Campaign: (TD07) * Basis: Ivan Petrov * Method/Device: (CTD-RO)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event		Kassens, Heidemarie
2	Sample code/label	Sample label		Kassens, Heidemarie
3	DATE/TIME	Date/Time		Kassens, Heidemarie	Geocode
4	LONGITUDE	Longitude		Kassens, Heidemarie	Geocode
5	LATITUDE	Latitude		Kassens, Heidemarie	Geocode
6	DEPTH, water	Depth water	m	Kassens, Heidemarie	Geocode
7	Temperature, water	Temp	°C	Timokhov, Leonid
8	Salinity	Sal		Bauch, Dorothea	PSU bottle
9	Phosphate	[PO4]3-	µmol/l	Novikhin, Andrey	#=interpolated values
10	Silicate	Si(OH)4	µmol/l	Novikhin, Andrey	#=interpolated values
11	Nitrate	[NO3]-	µmol/l	Novikhin, Andrey	#=interpolated values; ?=questionable
12	Sea ice meltwater	Sea ice w	%	Bauch, Dorothea
13	River water percentage	River water	%	Bauch, Dorothea
14	δ18O, water	δ18O H2O	‰ SMOW	Bauch, Dorothea

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

10429 data points

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