N-ICE2015 particulate matter absorption spectra

Particle absorption coefficients (m-1) in seawater and sea ice. Samples were filtered onto 0.7 µm glassfiber filters and stored in -80 °C until analysis. Filters were measured between 240 and 800 nm with a Shimadzu UV-2450 dual-beam spectrophotometer with a Shimadzu ISR-2200 integrating sphere. Measurement was made before and after bleaching of pigments with 400 µl of sodium hypochlorite (NaClO) solution with 1 % active chlorine for 10 minutes. Additional 20 minutes was used if the first bleaching was not complete. Filters were rinsed with artificial sea water (60 g Na2SO4 in 1 L of ultrapure water). As wet reference an average of 20 filters (filtered with ultrapure water throughout the campaign) was used. A baseline correction was done relative to the mean absorption values at 750–800 nm. Method used follows the method by Tassan and Ferrari 2002 ( https://doi.org/10.1093/plankt/24.8.757).

More sampling details in Kauko et al. 2017 ( https://doi.org/10.1002/2016JG003626), Pavlov et al. 2017 ( https://doi.org/10.1002/2016JC012471) and Kowalczuk et al. 2017 ( https://doi.org/10.1002/2016JC012589).


Separate files for water column samples from ship CTD and on-ice CTD (mini-rosette), and for sea ice samples from different environments (thick second-year/first-year ice and young ice in a refrozen lead).

Simple

Date (Revision)
2019-10-21
Credit

Hanna Kauko
Credit

Alexey Pavlov
Credit

Elina Nystedt
Credit

Mats A. Granskog
Status
On going
Publisher
  Norwegian Polar Institute - Hanna Kauko
Theme

  • Lance

  • ICE

  • N-ICE2015

  • Bottle

  • Sample

  • Floe-1

  • Floe-2

  • Floe-3

  • Floe-4

  • Leg-1

  • Leg-2

  • Leg-3

  • Leg-4

  • Leg-5

  • Leg-6

  • marine

  • ecology

  • oceanography

  • seaice
Nasjonal tematisk inndeling (DOK-kategori)

  • Kyst og fiskeri
Global Change Master Directory (GCMD) Keywords

  • OCEANS | OCEAN OPTICS | ABSORPTION

  • OCEANS | SALINITY/DENSITY

  • OCEANS | SEA ICE
Topic category
  • Oceans
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Begin date
2015-01-11
End date
2015-06-24
Distribution format
OnLine resource
https://data.npolar.no/dataset/7f7e56d0-9e70-4363-b37d-17915e09a935 ( WWW:DOWNLOAD-1.0-http--download )
Statement

Variables include total particulate absorption (a_p), absorption by detritus (or non-algal particles; a_d), and algal (or pigment) absorption (a_phi). The latter is simply the difference between the total absorption (measured prior to bleaching) and absorption by detritus (measured after bleaching). Values are reported every two wavelengths (wl) from 242 nm to 800 nm (280 individual wavelengths).


Ice samples metadata included in the mat file contain:

- sample ID

- coring site (see the above mentioned papers for more details)

- ice floe number (floe) for thick ice (see the above mentioned papers for more details); for young ice only floe 3

- date_hour: year, month, day, hour (in UTC) OR date as one cell (in UTC)

- latitude (decimals)

- longitude (decimals)

- ice thickness (in cm)

- snow depth (in cm)

- sectionbottom: ice core section bottom distance (in cm) from ice-water interface

- sectiontop: ice core section top distance (in cm) from ice-water interface

- sectiontype (for young ice): ice core section type: 1=whole core, 2=bottom part, 3=top part

- chlorophyll a concentration (in mg/m3)

- total melted volume of the ice core section (in mL)

- field sampling comments (fieldcomment)

- laboratory analysis comment (labcomment) for thick ice


Water samples metadata include time, latitude, longitude and pressure (depth in meters).
File identifier
35978199-1ed9-4077-b6db-6b4347d5e8e8 XML
Metadata language
English
Hierarchy level
Dataset
Date stamp
2022-05-27
Metadata standard name

CEOS IDN DIF
Metadata standard version

9.8.4
 
 

Overviews

Spatial extent

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Keywords

Bottle Floe-1 Floe-2 Floe-3 Floe-4 ICE Lance Leg-1 Leg-2 Leg-3 Leg-4 Leg-5 Leg-6 N-ICE2015 Sample ecology marine oceanography seaice

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