@Article{LutzFNSPRCDM:2016:BiChAl,
author = "Lutz, Vivian and Frouin, Robert and Negri, Rub{\'e}n and Silva,
Ricardo and Pompeu, Mayza and Rudorff, Natalia and Cabral,
Anderson and Dogliotti, Ana and Martinez, Gustavo",
affiliation = "IIMyC and {SIO - UCSD} and INIDEP and INIDEP and {Universidade de
S{\~a}o Paulo (USP)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Universidade Federal do Rio de Janeiro
(UFRJ)} and IAFE, CONICET/UBA and {Subsecretar{\'{\i}}a de Pesca
y Acuicultura - MAGyP}",
title = "Bio-optical characteristics along the Straits of Magallanes",
journal = "Continental Shelf Research",
year = "2016",
volume = "119",
pages = "55--67",
month = "May",
keywords = "Carbon to chlorophyll ratio, CDOM absorption, Particulate
absorption, Photoacclimation, Phytoplankton pigments, Straits of
Magallanes.",
abstract = "The Straits of Magallanes at the tip of South America connects the
Atlantic and Pacific Oceans. The variability in the absorption
characteristics by phytoplankton (aph(440)), non-pigmented
particles, NPP (aNPP(440)), and chromophoric dissolved organic
matter, CDOM (ay(440)), measured along the Straits in late summer
2011 (R/V Melville MV1102 cruise), was analyzed. Satellite-derived
monthly PAR data showed that at the time of the cruise the western
sector was exposed to a low-light environment (~16 mol quanta
m-2d-1) while the eastern sector received higher irradiance (~28
mol quanta m-2d-1). In the Patagonian Shelf total absorption was
dominated by phytoplankton (up to 76%; aph(440)=0.265 m-1), while
in the Atlantic Sector of the Straits, the major contributor was
NPP (up to 42%; aNPP(440)=0.138 m-1), and in the Pacific Sector of
the Straits CDOM contributed up to 80% of the total absorption
(ay(440)=0.232 m-1). These changes could be related in part to the
input of fresh water from glacier melting and rain in the Pacific
Sector (ay(440) vs salinity rs=-0.98). The carbon biomass (C) was
composed in its majority by pico-phytoplankton and secondly by
nano-phytoplankton, with exception of the Atlantic Sector where
the micro-phytoplankton dominated. Carbon to chlorophyll-a ratios
(C:Chla) were very low throughout the Straits (average of ~6)
because of photoacclimation to the extremely low light.
Complementary pigments data obtained in spring 2003 by the BEAGLE
expedition indicated the predominance of diatoms all along the
Straits, but the bio-optical trend resembled the one found in late
summer 2011, i.e., NPP dominated the absorption in the well mixed
Atlantic Sector, phytoplankton in the Middle Sector, and CDOM in
the Pacific Sector. These results emphasize that underwater light
is the major factor affecting phytoplankton growth and physiology,
and that prevalent physical and geochemical conditions play an
important role regulating the bio-optical properties in this
heterogeneous area. These effects should be considered to adjust
parameters (such as C:Chla) when running biogeochemical models for
this region.",
doi = "10.1016/j.csr.2016.03.008",
url = "http://dx.doi.org/10.1016/j.csr.2016.03.008",
issn = "0278-4343",
language = "en",
targetfile = "lutz_bio.pdf",
urlaccessdate = "15 jun. 2024"
}