Measurement and Identification of Aerosols Collected Near Barrow, Alaska
Measurements of the concentrations of Aitken nuclei in maritime air were made near Barrow, Alaska, in June 1975 with a modified Nolan-Pollack small-particle detector. The concentrations varied from 50 to 300 particles /cc depending upon meteorological conditions. The mean Aitken nuclei count was 100...
Main Author: | |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1978
|
Subjects: | |
Online Access: | http://www.dtic.mil/docs/citations/ADA058606 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA058606 |
id |
ftdtic:ADA058606 |
---|---|
record_format |
openpolar |
spelling |
ftdtic:ADA058606 2023-05-15T14:59:12+02:00 Measurement and Identification of Aerosols Collected Near Barrow, Alaska Kumai,Motoi COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H 1978-07 text/html http://www.dtic.mil/docs/citations/ADA058606 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA058606 en eng http://www.dtic.mil/docs/citations/ADA058606 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Atmospheric Physics *AEROSOLS *ARCTIC OCEAN *BARROW(ALASKA) MEASUREMENT COASTAL REGIONS ELECTRON MICROSCOPY IDENTIFICATION MARINE ATMOSPHERES PARTICLES CONCENTRATION(COMPOSITION) ELECTRON DIFFRACTION ARCTIC REGIONS Aitken nuclei WU003 AST24 PE61102A Text 1978 ftdtic 2016-02-20T13:39:03Z Measurements of the concentrations of Aitken nuclei in maritime air were made near Barrow, Alaska, in June 1975 with a modified Nolan-Pollack small-particle detector. The concentrations varied from 50 to 300 particles /cc depending upon meteorological conditions. The mean Aitken nuclei count was 100 particles /cc for diameters greater than .002 micrometers. Transmission electron micrographs of aerosols in maritime air near Barrow were taken. The size range was measured to be 0.01 to 2.5 micrometers in diameter with the most frequently observed diameter being 0.04 micrometers. The volume of the maritime air and the collection efficiency of aerosol particles on filmed grids for electron microscopy were measured. The aerosol concentrations were found to be 76 to 101 particles /cc; the mean concentration was calculated to be 87 particles /cc. The aerosol particles in the maritime air were identified by electron microscopy and selected area electron diffraction analysis. About 20% of the aerosol particles were identified, and 80% of the particles were too small for electron diffraction analysis. Sea salt particles constituted 2% of the total, and clay minerals 3%; these particles were considered to be of natural origin. Solid combustion by-products such as coagulated carbon particles and flyash particles constituted 16%. Despite the comparative remoteness of the sampling site, the measurements indicate that many anthropogenic aerosols were found using an electron microscope. (Author) Text Arctic Arctic Ocean Barrow Alaska Defense Technical Information Center: DTIC Technical Reports database Aitken ENVELOPE(-44.516,-44.516,-60.733,-60.733) Arctic Arctic Ocean |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Atmospheric Physics *AEROSOLS *ARCTIC OCEAN *BARROW(ALASKA) MEASUREMENT COASTAL REGIONS ELECTRON MICROSCOPY IDENTIFICATION MARINE ATMOSPHERES PARTICLES CONCENTRATION(COMPOSITION) ELECTRON DIFFRACTION ARCTIC REGIONS Aitken nuclei WU003 AST24 PE61102A |
spellingShingle |
Atmospheric Physics *AEROSOLS *ARCTIC OCEAN *BARROW(ALASKA) MEASUREMENT COASTAL REGIONS ELECTRON MICROSCOPY IDENTIFICATION MARINE ATMOSPHERES PARTICLES CONCENTRATION(COMPOSITION) ELECTRON DIFFRACTION ARCTIC REGIONS Aitken nuclei WU003 AST24 PE61102A Kumai,Motoi Measurement and Identification of Aerosols Collected Near Barrow, Alaska |
topic_facet |
Atmospheric Physics *AEROSOLS *ARCTIC OCEAN *BARROW(ALASKA) MEASUREMENT COASTAL REGIONS ELECTRON MICROSCOPY IDENTIFICATION MARINE ATMOSPHERES PARTICLES CONCENTRATION(COMPOSITION) ELECTRON DIFFRACTION ARCTIC REGIONS Aitken nuclei WU003 AST24 PE61102A |
description |
Measurements of the concentrations of Aitken nuclei in maritime air were made near Barrow, Alaska, in June 1975 with a modified Nolan-Pollack small-particle detector. The concentrations varied from 50 to 300 particles /cc depending upon meteorological conditions. The mean Aitken nuclei count was 100 particles /cc for diameters greater than .002 micrometers. Transmission electron micrographs of aerosols in maritime air near Barrow were taken. The size range was measured to be 0.01 to 2.5 micrometers in diameter with the most frequently observed diameter being 0.04 micrometers. The volume of the maritime air and the collection efficiency of aerosol particles on filmed grids for electron microscopy were measured. The aerosol concentrations were found to be 76 to 101 particles /cc; the mean concentration was calculated to be 87 particles /cc. The aerosol particles in the maritime air were identified by electron microscopy and selected area electron diffraction analysis. About 20% of the aerosol particles were identified, and 80% of the particles were too small for electron diffraction analysis. Sea salt particles constituted 2% of the total, and clay minerals 3%; these particles were considered to be of natural origin. Solid combustion by-products such as coagulated carbon particles and flyash particles constituted 16%. Despite the comparative remoteness of the sampling site, the measurements indicate that many anthropogenic aerosols were found using an electron microscope. (Author) |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H |
format |
Text |
author |
Kumai,Motoi |
author_facet |
Kumai,Motoi |
author_sort |
Kumai,Motoi |
title |
Measurement and Identification of Aerosols Collected Near Barrow, Alaska |
title_short |
Measurement and Identification of Aerosols Collected Near Barrow, Alaska |
title_full |
Measurement and Identification of Aerosols Collected Near Barrow, Alaska |
title_fullStr |
Measurement and Identification of Aerosols Collected Near Barrow, Alaska |
title_full_unstemmed |
Measurement and Identification of Aerosols Collected Near Barrow, Alaska |
title_sort |
measurement and identification of aerosols collected near barrow, alaska |
publishDate |
1978 |
url |
http://www.dtic.mil/docs/citations/ADA058606 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA058606 |
long_lat |
ENVELOPE(-44.516,-44.516,-60.733,-60.733) |
geographic |
Aitken Arctic Arctic Ocean |
geographic_facet |
Aitken Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Barrow Alaska |
genre_facet |
Arctic Arctic Ocean Barrow Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA058606 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766331331501883392 |