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Bauch, Dorothea; Cherniavskaia, Ekaterina; Novikhin, Andrey; Kassens, Heidemarie (2018): Physical oceanography, nutrients, and δ¹⁸O measured on water bottle samples in the Laptev Sea. PANGAEA,, Supplement to: Bauch, Dorothea; Cherniavskaia, Ekaterina (2018): Water Mass Classification on a Highly Variable Arctic Shelf Region: Origin of Laptev Sea Water Masses and Implications for the Nutrient Budget. Journal of Geophysical Research: Oceans,

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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.
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
IP07-2_1 * Latitude: 72.499680 * Longitude: 131.023000 * Date/Time: 2007-08-29T15:10:00 * Elevation: -18.5 m * Campaign: Transdrift-XII (TD07) * Basis: Ivan Petrov * Method/Device: CTD/Rosette (CTD-RO)
IP07-2_1-1L * Latitude: 75.831180 * Longitude: 125.995280 * Date/Time: 2007-09-12T07:19:00 * Elevation: -44.0 m * Campaign: Transdrift-XII (TD07) * Basis: Ivan Petrov * Method/Device: CTD/Rosette (CTD-RO)
IP07-2_1-1P * Latitude: 74.334380 * Longitude: 123.001300 * Date/Time: 2007-09-03T21:05:00 * Elevation: -13.3 m * Campaign: Transdrift-XII (TD07) * Basis: Ivan Petrov * Method/Device: CTD/Rosette (CTD-RO)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventKassens, Heidemarie
2Sample code/labelSample labelKassens, Heidemarie
3DATE/TIMEDate/TimeKassens, HeidemarieGeocode
4LONGITUDELongitudeKassens, HeidemarieGeocode
5LATITUDELatitudeKassens, HeidemarieGeocode
6DEPTH, waterDepth watermKassens, HeidemarieGeocode
7Temperature, waterTemp°CTimokhov, Leonid
8SalinitySalBauch, DorotheaPSU bottle
9Phosphate[PO4]3-µmol/lNovikhin, Andrey#=interpolated values
10SilicateSi(OH)4µmol/lNovikhin, Andrey#=interpolated values
11Nitrate[NO3]-µmol/lNovikhin, Andrey#=interpolated values; ?=questionable
12Sea ice meltwaterSea ice w%Bauch, Dorothea
13River water percentageRiver water%Bauch, Dorothea
14δ18O, waterδ18O H2O‰ SMOWBauch, Dorothea
10429 data points

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