Water-Column Studies near a Melting Arctic Iceberg
Glacial icebergs contain large amounts of nitrate, an important phytoplankton nutrient. Low density iceberg meltwater, in rising, mixes with euphotic zone water nearby, wherein NO3 is in low concentration. Rising meltwater may also entrain nutrient-rich deeper waters and raise them to sunlit depths....
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ftdtic:ADA108304 2023-05-15T13:41:52+02:00 Water-Column Studies near a Melting Arctic Iceberg Shulenberger,Eric SAN DIEGO NATURAL HISTORY MUSEUM CA 1981-12 text/html http://www.dtic.mil/docs/citations/ADA108304 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA108304 en eng http://www.dtic.mil/docs/citations/ADA108304 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Biology Snow Ice and Permafrost *WATER *ANTARCTIC REGIONS *PLANTS(BOTANY) *GLACIERS *GREENLAND *ICEBERGS DENSITY RATES DIRECTION FINDING NUTRIENTS PROFILES FEASIBILITY STUDIES VERTICAL ORIENTATION MELTING WIND DIRECTION MIXING LOW DENSITY PHYTOPLANKTON SUNLIGHT CHLOROPHYLLS EUPHOTIC ZONES Glacial icebergs Water column studies Plant biology Text 1981 ftdtic 2016-02-20T21:04:29Z Glacial icebergs contain large amounts of nitrate, an important phytoplankton nutrient. Low density iceberg meltwater, in rising, mixes with euphotic zone water nearby, wherein NO3 is in low concentration. Rising meltwater may also entrain nutrient-rich deeper waters and raise them to sunlit depths. Sixteen vertical profiles of nutrients (PO4, NO3, SiO2), chlorophyll-a, and physical parameters were taken near a Greenland iceberg at approx. 50 deg. N, 50 deg. W in May-June 1980. Chlorophyll profiles show very pronounced maxima at or just below the maximum rate of change of water density vs. depth; profile forms are heterogeneous (no 'typical' form is evident). No enhancement of chlorophyll concentration was found re distance from or direction to the iceberg. Effects of mixing on NO 3 concentrations are marginally detectable, but no 'wake' or 'downwind' effects were observed. The iceberg does not appear to grossly perturb water column plant biology nearby, but measures of rates of productivity might show otherwise, particularly near larger (e.g. Antarctic) icebergs. (Author) Text Antarc* Antarctic Arctic Greenland Ice Iceberg* Iceberg* permafrost Phytoplankton Defense Technical Information Center: DTIC Technical Reports database Antarctic Arctic Greenland |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Biology Snow Ice and Permafrost *WATER *ANTARCTIC REGIONS *PLANTS(BOTANY) *GLACIERS *GREENLAND *ICEBERGS DENSITY RATES DIRECTION FINDING NUTRIENTS PROFILES FEASIBILITY STUDIES VERTICAL ORIENTATION MELTING WIND DIRECTION MIXING LOW DENSITY PHYTOPLANKTON SUNLIGHT CHLOROPHYLLS EUPHOTIC ZONES Glacial icebergs Water column studies Plant biology |
spellingShingle |
Biology Snow Ice and Permafrost *WATER *ANTARCTIC REGIONS *PLANTS(BOTANY) *GLACIERS *GREENLAND *ICEBERGS DENSITY RATES DIRECTION FINDING NUTRIENTS PROFILES FEASIBILITY STUDIES VERTICAL ORIENTATION MELTING WIND DIRECTION MIXING LOW DENSITY PHYTOPLANKTON SUNLIGHT CHLOROPHYLLS EUPHOTIC ZONES Glacial icebergs Water column studies Plant biology Shulenberger,Eric Water-Column Studies near a Melting Arctic Iceberg |
topic_facet |
Biology Snow Ice and Permafrost *WATER *ANTARCTIC REGIONS *PLANTS(BOTANY) *GLACIERS *GREENLAND *ICEBERGS DENSITY RATES DIRECTION FINDING NUTRIENTS PROFILES FEASIBILITY STUDIES VERTICAL ORIENTATION MELTING WIND DIRECTION MIXING LOW DENSITY PHYTOPLANKTON SUNLIGHT CHLOROPHYLLS EUPHOTIC ZONES Glacial icebergs Water column studies Plant biology |
description |
Glacial icebergs contain large amounts of nitrate, an important phytoplankton nutrient. Low density iceberg meltwater, in rising, mixes with euphotic zone water nearby, wherein NO3 is in low concentration. Rising meltwater may also entrain nutrient-rich deeper waters and raise them to sunlit depths. Sixteen vertical profiles of nutrients (PO4, NO3, SiO2), chlorophyll-a, and physical parameters were taken near a Greenland iceberg at approx. 50 deg. N, 50 deg. W in May-June 1980. Chlorophyll profiles show very pronounced maxima at or just below the maximum rate of change of water density vs. depth; profile forms are heterogeneous (no 'typical' form is evident). No enhancement of chlorophyll concentration was found re distance from or direction to the iceberg. Effects of mixing on NO 3 concentrations are marginally detectable, but no 'wake' or 'downwind' effects were observed. The iceberg does not appear to grossly perturb water column plant biology nearby, but measures of rates of productivity might show otherwise, particularly near larger (e.g. Antarctic) icebergs. (Author) |
author2 |
SAN DIEGO NATURAL HISTORY MUSEUM CA |
format |
Text |
author |
Shulenberger,Eric |
author_facet |
Shulenberger,Eric |
author_sort |
Shulenberger,Eric |
title |
Water-Column Studies near a Melting Arctic Iceberg |
title_short |
Water-Column Studies near a Melting Arctic Iceberg |
title_full |
Water-Column Studies near a Melting Arctic Iceberg |
title_fullStr |
Water-Column Studies near a Melting Arctic Iceberg |
title_full_unstemmed |
Water-Column Studies near a Melting Arctic Iceberg |
title_sort |
water-column studies near a melting arctic iceberg |
publishDate |
1981 |
url |
http://www.dtic.mil/docs/citations/ADA108304 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA108304 |
geographic |
Antarctic Arctic Greenland |
geographic_facet |
Antarctic Arctic Greenland |
genre |
Antarc* Antarctic Arctic Greenland Ice Iceberg* Iceberg* permafrost Phytoplankton |
genre_facet |
Antarc* Antarctic Arctic Greenland Ice Iceberg* Iceberg* permafrost Phytoplankton |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA108304 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766159567595503616 |