High Biomass Low Export Regimes in the Southern Ocean Page: 9 of 75
View a full description of this article.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
9
The main flow of the MULVFS separates particles into "<1 m", 1-51 m, and >51 m
size fractions on a series of paired Whatman quartz fiber (QMA) filters and a polyester prefilter
(51 m mesh size), respectively. Both the 51 m polyester and the paired QMA filters were
supported by 149 m polyester mesh to facilitate sample handling, but there was no additional
pre-screen upstream of the 51 m polyester prefilter. All filters were of diameter 27.9 cm, but
the active particle collection area was of diameter 25.4 cm. The efficiency of trapping by the
quartz fiber filters drops sharply for particles below 1 m, so the "< 1 m" size fraction is not
quantitative, but provides an idea of the systematics of small particles (Bishop and Edmond
1976; Bishop et al. 1977; Bishop et al. 1985). A separate side-arm flow path enabled filtration of
up to 50 liters through a 47-mm diameter polycarbonate filter of pore size 0.4 m.
A CTD instrument at the end of the MULVFS electromechanical cable recorded
temperature and salinity of the water column and provided depth control during MULVFS casts.
We collected "dipped blank" samples, which were the usual MULVFS suite of filters on
MULVFS pumps that were deployed identically to other pumps for the duration of the sample
collection but whose pump was purposefully disconnected from power and did not have water
flowing through. Few or no particles were observed on the filters, thus validating the use of
these samples as in-situ blanks. Dipped blank samples were processed identically to all other
samples, and are comprehensive blanks for all aspects of sample handling from pre-cruise
treatment through deployment through post-cruise analysis.
The MULVFS filters were lightly misted with distilled water under suction to remove
excess seawater before being dried in a 60 C oven. Each filter is exposed to 5-10 mL of distilled
water during misting. Subsamples of the "<1 m" and 1-51 m size fractions were isolated from
Upcoming Pages
Here’s what’s next.
Search Inside
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Lam, Phoebe J. & Bishop, James K.B. High Biomass Low Export Regimes in the Southern Ocean, article, January 27, 2006; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc880389/m1/9/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.