Data

Particulate organic matter elemental analysis, mixed layer, during the K-Azis voyage of the Aurora Australis au1603

Australian Ocean Data Network
Davies, D.M. ; DAVIES, DIANA MAY
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Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4331_KAxis_CTD_POM_POC_PON when using these data.
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These data are publicly available for download from the provided URL. Please contact the data custodians before use.

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Brief description

Water samples of 1 to 2L from Niskin bottles filled close to the surface, mid mixed layer depth and bottom of the mixed layer were drawn cleanly through a 210um mesh to exclude zooplankton. All samples were filtered as two size fractions, 1.2 to 20um (larger particles excluded by 20um Nitex mesh) and a separate 1.2 to 210um total sample. The filters were 1.2um silver membranes (Sterlitech) 13mm diameter. The samples were preserved by drying at 60C in a dedicated clean oven. Prior to encapsulation, a 5mm diameter subsample was taken for biogenic silica analysis, which is delayed until there has been evaluation of the particle data from the flow cam and UVP. Samples were encapsulated in silver (Sercon sc0037) after acidification and drying. The decarbonated encapsulated POC samples were analysed by elemental analyser at the CSL UTAS by Dr Thomas Rodemann (EA TCD 960C, single point standardisation every 12 samples).  EA detection limit 0.001umol POC. POC and PON are presented as molar units. Blanks were process blanks (seawater) and 7% of the average for the combined data n=177. 1sd=0.12uM.

The ctd casts were all given the prefix K, so K001, K002 etc. Not all stations were sampled due to budget constraints. Niskin is the Niskin bottle number.

Lineage

Progress Code: completed
Statement: Large chain forming diatoms (Rhizosolenia) were present on occasions and partially excluded by the 210um mesh. One extra station is recorded at CTD0.5 UW which was a surface underway sample within a polynya (no cast was done).

Notes

Purpose
The samples were collected to inform interpretation of co-sampled particulates analysed by flow cam and link to primary productivity and pigment results. A subset of this data has been reported to SOCCOM for stations where a float was launched.

Data time period: 2016-01-19 to 2016-02-19

93.5685993,-58.651436 93.5685993,-66.802756 62.8942053,-66.802756 62.8942053,-58.651436 93.5685993,-58.651436

78.2314023,-62.727096

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uri : https://data.aad.gov.au/eds/4912/download

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