Absorption coefficient spectra (median) of phytoplankton during POLARSTERN cruise PS93.2


Absorption coefficients by phytoplankton (aph) were measured on water samples collected from underway AC-S flow-through system outflow and CTD. Measurements were performed using a dual-beam UV/VIS spectrophotometer as described in Liu et al. (2018) and Liu et al. (2019).1. About sampling:a) underway samples were collected from unfiltered AC-S outflow (depth: 11m); CTD samples with 5-6 depths were collected on upcast.b) vacuum pressure for filtration: maximum 200 hPac) samples were shock frozen in liquid nitrogen and then stored in -80°C until measurement after cruise.d) blank filters were collected by soaking them in 0.2um filtered seawater.e) replicates were not collected.2. About measurements:a) Instrument: dual-beam UV/VIS Spectrophotometer (Cary 4000, Varian Inc., Palo Alto, CA, USA) equipped with a 150 mm integrating sphere (external DRA-900, Varian, Inc. and Labsphere Inc., made from Spectralon (TM)).b) wavelength range of scan and resolution: 300-850 nm, 1 nm.c) slit band width: 2 nm.d) scan speed: 150 nm min−1e) Sample filters were extracted with 95% methanol for the absorption measurement of NAP.f) The baseline of the spectrophotometer was set with a dry piece of a blank filter. Filters were wetted with purified water and measured regularly after every fifth sample filter served as references.3. About data analysis:a) interpolated wavelength range and resolution: 350-750 nm, 1nm.b) pathlength amplification factor (beta correction factor): 4.5 (Röttgers and Gehnke 2012; Röttgers et al., 2014).c) Null-point scattering correction at 750 nm is applied.

DOI https://doi.org/10.1594/PANGAEA.907593
Related Identifier IsPartOf https://doi.org/10.1594/PANGAEA.907605
Related Identifier References https://doi.org/10.3390/rs11030318
Related Identifier IsDocumentedBy https://doi.org/10.1364/OE.26.00A678
Related Identifier IsDocumentedBy https://doi.org/10.4319/lo.2014.59.5.1449
Related Identifier IsDocumentedBy https://doi.org/10.1364/AO.51.001336
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.907593
Creator Wiegmann, Sonja; Liu, Yangyang ORCID logo; Bracher, Astrid ORCID logo
Publisher PANGAEA
Publication Year 2019
Funding Reference German Research Foundation https://doi.org/10.13039/501100001659 Crossref Funder ID 268020496 https://gepris.dfg.de/gepris/projekt/268020496 TRR 172: ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Resource Type Dataset
Format text/tab-separated-values
Size 97042 data points
Discipline Earth System Research
Spatial Coverage (-3.068W, 73.429S, 14.255E, 80.005N); North Greenland Sea
Temporal Coverage Begin 2015-07-22T22:00:00Z
Temporal Coverage End 2015-08-12T05:08:00Z