Primary productivity measurements in the Ross Sea, Antarctica: a regional synthesis
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Published:2022-06-15
Issue:6
Volume:14
Page:2737-2747
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ISSN:1866-3516
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Container-title:Earth System Science Data
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language:en
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Short-container-title:Earth Syst. Sci. Data
Abstract
Abstract. Polar systems are undersampled due to the difficulty of
sampling remote and challenging environments; however, these systems are
critical components of global biogeochemical cycles. Measurements on primary
productivity in specific areas can quantify the input of organic matter to
food webs and so are of critical ecological importance as well. However,
long-term measurements using the same methodology are available only for a
few polar systems. Primary productivity measurements using 14C-uptake
incubations from the Ross Sea, Antarctica, are synthesized, along with
chlorophyll concentrations at the same depths and locations. A total of 19 independent cruises were completed and 449 stations occupied where
measurements of primary productivity (each with seven depths) were completed.
The incubations used the same basic simulated in situ methodology for all.
Integrated water column productivity for all stations averaged 1.10 ± 1.20 g C m−2 d−1, and the maximum was 13.1 g C m−2 d−1.
Annual productivity calculated from the means throughout the growing season
equalled 146 g C m−2 yr−1. The mean chlorophyll concentration in
the euphotic zone (the 1 % irradiance level) was 2.85 ± 2.68 mg m−3 (maximum observed concentration was 19.1 mg m−3). Maximum
photosynthetic rates above the 30 % isolume (normalized to chlorophyll)
averaged 0.98 ± 0.71 mg C (mg chl)−1 h−1, similar to the
maximum rate found in photosynthesis–irradiance measurements. Productivity
measurements are consistent with the temporal patterns of biomass found
previously, with biomass and productivity peaking in late December; mixed
layers were at a minimum at this time as well. Estimates of plankton
composition also suggest that pre-January productivity was largely driven by
the haptophyte Phaeocystis antarctica and summer productivity by diatoms. The data set (https://doi.org/10.26008/1912/bco-dmo.863815.2, Smith, 2021) will be
useful for a comparison to other Antarctic regions and provide a basis for
refined bio-optical models of regional primary productivity and
biogeochemical models for the Southern Ocean.
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences
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