(Table 2) Integrated concentration, production and dissolution of silica in the water column of the southern Pacific
An intense diatom bloom developed within a strong meridional silicic acid gradient across the Antarctic Polar Front at 61°S, 170°W following stratification of the water column in late October/early November 1997. The region of high diatom biomass and the silicic acid gradient propogated southward ac...
Main Author: | |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2001
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.441703 https://doi.org/10.1594/PANGAEA.441703 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.441703 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.441703 2024-09-09T19:06:14+00:00 (Table 2) Integrated concentration, production and dissolution of silica in the water column of the southern Pacific Brzezinski, Mark A MEDIAN LATITUDE: -59.920513 * MEDIAN LONGITUDE: -170.356154 * SOUTH-BOUND LATITUDE: -67.780000 * WEST-BOUND LONGITUDE: -174.730000 * NORTH-BOUND LATITUDE: -52.970000 * EAST-BOUND LONGITUDE: -168.290000 * DATE/TIME START: 1997-10-26T00:00:00 * DATE/TIME END: 1998-03-19T00:00:00 2001 text/tab-separated-values, 172 data points https://doi.pangaea.de/10.1594/PANGAEA.441703 https://doi.org/10.1594/PANGAEA.441703 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.441703 https://doi.org/10.1594/PANGAEA.441703 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Brzezinski, Mark A; Nelson, David M; Franck, Valerie M; Sigmon, Daniel E (2001): Silicon dynamics within an intense open-ocean diatom bloom in the Pacific sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 48(19-20), 3997-4018, https://doi.org/10.1016/S0967-0645(01)00078-9 Biogenic silica flux Biogenic silica dissolution Biogenic silica production Calculated DATE/TIME Dissolution integrated LATITUDE LONGITUDE Production Ratio Sample code/label dataset 2001 ftpangaea https://doi.org/10.1594/PANGAEA.44170310.1016/S0967-0645(01)00078-9 2024-07-24T02:31:27Z An intense diatom bloom developed within a strong meridional silicic acid gradient across the Antarctic Polar Front at 61°S, 170°W following stratification of the water column in late October/early November 1997. The region of high diatom biomass and the silicic acid gradient propogated southward across the Seasonal Ice Zone through time, with the maximum diatom biomass tracking the center of the silicic acid gradient. High diatom biomass and high rates of silica production persisted within the silicic acid gradient until the end of January 1998 (ca. 70 d) driving the gradient over 500 km to the south of its original position at the Polar Front. The bloom consumed 30 to >40 µM Si(OH)4 in the euphotic zone between about 60 and 66°S leaving near surface concentrations <2.5 µM and occasionally <1.0 µM in its wake. Integrated biogenic silica concentrations within the bloom averaged 410 mmol Si/m**2 (range 162-793 mmol Si/m**2). Average integrated silica production on two consecutive cruises in December 1997 and January 1998 that sampled the bloom while it was well developed were 27.5±6.9 and 22.6±20 mmol Si/m**2/d, respectively. Those levels of siliceous biomass and silica production are similar in magnitude to those reported for ice-edge diatom blooms in the Ross Sea, Antarctica, which is considered to be among the most productive regions in the Southern Ocean. Net silica production (production minus dissolution) in surface waters during the bloom was 16-21 mmol Si/m**2/d, which is sufficient for diatom growth to be the cause of the southward displacement of the silicic acid gradient. A strong seasonal change in silica dissolution : silica production rate ratios was observed. Integrated silica dissolution rates in the upper 100-150 m during the low biomass period before stratification averaged 64% of integrated production. During the bloom integrated dissolution rates averaged only 23% of integrated silica production, making 77% of the opal produced available for export to depth. The bloom ended in late ... Dataset Antarc* Antarctic Antarctica Ross Sea Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean The Antarctic Ross Sea Pacific ENVELOPE(-174.730000,-168.290000,-52.970000,-67.780000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Biogenic silica flux Biogenic silica dissolution Biogenic silica production Calculated DATE/TIME Dissolution integrated LATITUDE LONGITUDE Production Ratio Sample code/label |
spellingShingle |
Biogenic silica flux Biogenic silica dissolution Biogenic silica production Calculated DATE/TIME Dissolution integrated LATITUDE LONGITUDE Production Ratio Sample code/label Brzezinski, Mark A (Table 2) Integrated concentration, production and dissolution of silica in the water column of the southern Pacific |
topic_facet |
Biogenic silica flux Biogenic silica dissolution Biogenic silica production Calculated DATE/TIME Dissolution integrated LATITUDE LONGITUDE Production Ratio Sample code/label |
description |
An intense diatom bloom developed within a strong meridional silicic acid gradient across the Antarctic Polar Front at 61°S, 170°W following stratification of the water column in late October/early November 1997. The region of high diatom biomass and the silicic acid gradient propogated southward across the Seasonal Ice Zone through time, with the maximum diatom biomass tracking the center of the silicic acid gradient. High diatom biomass and high rates of silica production persisted within the silicic acid gradient until the end of January 1998 (ca. 70 d) driving the gradient over 500 km to the south of its original position at the Polar Front. The bloom consumed 30 to >40 µM Si(OH)4 in the euphotic zone between about 60 and 66°S leaving near surface concentrations <2.5 µM and occasionally <1.0 µM in its wake. Integrated biogenic silica concentrations within the bloom averaged 410 mmol Si/m**2 (range 162-793 mmol Si/m**2). Average integrated silica production on two consecutive cruises in December 1997 and January 1998 that sampled the bloom while it was well developed were 27.5±6.9 and 22.6±20 mmol Si/m**2/d, respectively. Those levels of siliceous biomass and silica production are similar in magnitude to those reported for ice-edge diatom blooms in the Ross Sea, Antarctica, which is considered to be among the most productive regions in the Southern Ocean. Net silica production (production minus dissolution) in surface waters during the bloom was 16-21 mmol Si/m**2/d, which is sufficient for diatom growth to be the cause of the southward displacement of the silicic acid gradient. A strong seasonal change in silica dissolution : silica production rate ratios was observed. Integrated silica dissolution rates in the upper 100-150 m during the low biomass period before stratification averaged 64% of integrated production. During the bloom integrated dissolution rates averaged only 23% of integrated silica production, making 77% of the opal produced available for export to depth. The bloom ended in late ... |
format |
Dataset |
author |
Brzezinski, Mark A |
author_facet |
Brzezinski, Mark A |
author_sort |
Brzezinski, Mark A |
title |
(Table 2) Integrated concentration, production and dissolution of silica in the water column of the southern Pacific |
title_short |
(Table 2) Integrated concentration, production and dissolution of silica in the water column of the southern Pacific |
title_full |
(Table 2) Integrated concentration, production and dissolution of silica in the water column of the southern Pacific |
title_fullStr |
(Table 2) Integrated concentration, production and dissolution of silica in the water column of the southern Pacific |
title_full_unstemmed |
(Table 2) Integrated concentration, production and dissolution of silica in the water column of the southern Pacific |
title_sort |
(table 2) integrated concentration, production and dissolution of silica in the water column of the southern pacific |
publisher |
PANGAEA |
publishDate |
2001 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.441703 https://doi.org/10.1594/PANGAEA.441703 |
op_coverage |
MEDIAN LATITUDE: -59.920513 * MEDIAN LONGITUDE: -170.356154 * SOUTH-BOUND LATITUDE: -67.780000 * WEST-BOUND LONGITUDE: -174.730000 * NORTH-BOUND LATITUDE: -52.970000 * EAST-BOUND LONGITUDE: -168.290000 * DATE/TIME START: 1997-10-26T00:00:00 * DATE/TIME END: 1998-03-19T00:00:00 |
long_lat |
ENVELOPE(-174.730000,-168.290000,-52.970000,-67.780000) |
geographic |
Antarctic Southern Ocean The Antarctic Ross Sea Pacific |
geographic_facet |
Antarctic Southern Ocean The Antarctic Ross Sea Pacific |
genre |
Antarc* Antarctic Antarctica Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ross Sea Southern Ocean |
op_source |
Supplement to: Brzezinski, Mark A; Nelson, David M; Franck, Valerie M; Sigmon, Daniel E (2001): Silicon dynamics within an intense open-ocean diatom bloom in the Pacific sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 48(19-20), 3997-4018, https://doi.org/10.1016/S0967-0645(01)00078-9 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.441703 https://doi.org/10.1594/PANGAEA.441703 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.44170310.1016/S0967-0645(01)00078-9 |
_version_ |
1809820280312299520 |