English UTF-8 Point of contact NOAA/PMEL Science Data Integration Group +1 206-526-6744 Voice 7600 Sand Point way NE Seattle WA 98115 USA ellen.koukel@noaa.gov ERDDAP administrator 17 Time Sample Sample Row Column Vertical Sample Sample Sample Sample Sample Sample Sample Sample Sample Sample Sample false PMEL Atmospheric Chemistry ICEALOT Aerosol Size Distribution (DMPS) data 2026-05-12T15:20:04.706-07:00 Creation data.pmel.noaa.gov/pmel ACG_ICEALOT_Knorr_aerosol_sizedist_dmps Originator NOAA Coffman, Derek derek.coffman@noaa.gov index.html information web browser Background Information Background information from the source Information Pacific Marine Environmental Laboratory (PMEL) Size Distributions Aerosol inlet: Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002]. The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol. DMPS (datasets denoted by _aerosol_sizedist_dmps_): One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration. APS (datasets denoted by _aerosol_sizedist_aps_): One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration. Merged (datasets denoted by _aerosol_sizedist): These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions. All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume. Additional datasets may be included for a give project that include: - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations Point of contact NOAA Coffman, Derek derek.coffman@noaa.gov index.html information web browser Background Information Background information from the source Information geoscientificInformation boundingExtent true -73.69599914550781 31.52985954284668 40.8974494934082 80.21768188476562 2008-03-20T12:00:00Z 2008-04-23T09:29:59Z 18.0 18.0 above aerosol area atmosphere atmospheric bin chemistry data datetime diameter distribution dlogDp dmps dNdlogDp dSdlogDp duration dVdlogDp earth environmental icealot identifier laboratory level log log-normal marine mean midpoint noaa normal normalized number pacific particle pmel science sea size station statistics stokes surface trajectory volume width Theme Earth Science > Atmosphere > Altitude > Station Height Theme GCMD Science Keywords ICEALOT Theme time latitude longitude altitude Theme CF Standard Name Table v70 These data were produced by NOAA and are not subject to copyright protection in the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0). ICEALOT Larger work citation Project Trajectory Unidata Common Data Model Trajectory Larger work citation Project PMEL Atmospheric Chemistry ICEALOT Aerosol Size Distribution (DMPS) data 2026-05-12T15:20:04.706-07:00 Creation Originator NOAA Coffman, Derek derek.coffman@noaa.gov index.html information web browser Background Information Background information from the source Information boundingExtent true -73.69599914550781 31.52985954284668 40.8974494934082 80.21768188476562 2008-03-20T12:00:00Z 2008-04-23T09:29:59Z 18.0 18.0 ERDDAP tabledap PMEL Atmospheric Chemistry ICEALOT Aerosol Size Distribution (DMPS) data 2026-05-12T15:20:04.706-07:00 Creation data.pmel.noaa.gov/pmel ACG_ICEALOT_Knorr_aerosol_sizedist_dmps Originator NOAA Coffman, Derek derek.coffman@noaa.gov index.html information web browser Background Information Background information from the source Information Pacific Marine Environmental Laboratory (PMEL) Size Distributions Aerosol inlet: Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002]. The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol. DMPS (datasets denoted by _aerosol_sizedist_dmps_): One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration. APS (datasets denoted by _aerosol_sizedist_aps_): One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration. Merged (datasets denoted by _aerosol_sizedist): These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions. All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume. Additional datasets may be included for a give project that include: - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations Point of contact NOAA Coffman, Derek derek.coffman@noaa.gov index.html information web browser Background Information Background information from the source Information geoscientificInformation boundingExtent true -73.69599914550781 31.52985954284668 40.8974494934082 80.21768188476562 2008-03-20T12:00:00Z 2008-04-23T09:29:59Z 18.0 18.0 above aerosol area atmosphere atmospheric bin chemistry data datetime diameter distribution dlogDp dmps dNdlogDp dSdlogDp duration dVdlogDp earth environmental icealot identifier laboratory level log log-normal marine mean midpoint noaa normal normalized number pacific particle pmel science sea size station statistics stokes surface trajectory volume width Theme Earth Science > Atmosphere > Altitude > Station Height Theme GCMD Science Keywords ICEALOT Theme time latitude longitude altitude Theme CF Standard Name Table v70 These data were produced by NOAA and are not subject to copyright protection in the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0). ICEALOT Larger work citation Project Trajectory Unidata Common Data Model Trajectory Larger work citation Project ERDDAPtabledapDatasetQueryAndAccess ACG_ICEALOT_Knorr_aerosol_sizedist_dmps ERDDAP:tabledap ERDDAP-tabledap ERDDAP's tabledap service (a flavor of OPeNDAP) for tabular (sequence) data. Add different extensions (e.g., .html, .graph, .das, .dds) to the base URL for different purposes. Download PMEL Atmospheric Chemistry ICEALOT Aerosol Size Distribution (DMPS) data 2026-05-12T15:20:04.706-07:00 Creation Originator NOAA Coffman, Derek derek.coffman@noaa.gov index.html information web browser Background Information Background information from the source Information boundingExtent true -73.69599914550781 31.52985954284668 40.8974494934082 80.21768188476562 2008-03-20T12:00:00Z 2008-04-23T09:29:59Z 18.0 18.0 OPeNDAP PMEL Atmospheric Chemistry ICEALOT Aerosol Size Distribution (DMPS) data 2026-05-12T15:20:04.706-07:00 Creation data.pmel.noaa.gov/pmel ACG_ICEALOT_Knorr_aerosol_sizedist_dmps Originator NOAA Coffman, Derek derek.coffman@noaa.gov index.html information web browser Background Information Background information from the source Information Pacific Marine Environmental Laboratory (PMEL) Size Distributions Aerosol inlet: Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002]. The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol. DMPS (datasets denoted by _aerosol_sizedist_dmps_): One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration. APS (datasets denoted by _aerosol_sizedist_aps_): One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration. Merged (datasets denoted by _aerosol_sizedist): These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions. All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume. Additional datasets may be included for a give project that include: - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations Point of contact NOAA Coffman, Derek derek.coffman@noaa.gov index.html information web browser Background Information Background information from the source Information geoscientificInformation boundingExtent true -73.69599914550781 31.52985954284668 40.8974494934082 80.21768188476562 2008-03-20T12:00:00Z 2008-04-23T09:29:59Z 18.0 18.0 above aerosol area atmosphere atmospheric bin chemistry data datetime diameter distribution dlogDp dmps dNdlogDp dSdlogDp duration dVdlogDp earth environmental icealot identifier laboratory level log log-normal marine mean midpoint noaa normal normalized number pacific particle pmel science sea size station statistics stokes surface trajectory volume width Theme Earth Science > Atmosphere > Altitude > Station Height Theme GCMD Science Keywords ICEALOT Theme time latitude longitude altitude Theme CF Standard Name Table v70 These data were produced by NOAA and are not subject to copyright protection in the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0). ICEALOT Larger work citation Project Trajectory Unidata Common Data Model Trajectory Larger work citation Project OPeNDAPDatasetQueryAndAccess ACG_ICEALOT_Knorr_aerosol_sizedist_dmps OPeNDAP:OPeNDAP OPeNDAP An OPeNDAP service for tabular (sequence) data. Add different extensions (e.g., .html, .das, .dds) to the base URL for different purposes Download PMEL Atmospheric Chemistry ICEALOT Aerosol Size Distribution (DMPS) data 2026-05-12T15:20:04.706-07:00 Creation Originator NOAA Coffman, Derek derek.coffman@noaa.gov index.html information web browser Background Information Background information from the source Information boundingExtent true -73.69599914550781 31.52985954284668 40.8974494934082 80.21768188476562 2008-03-20T12:00:00Z 2008-04-23T09:29:59Z 18.0 18.0 OPeNDAP PMEL Atmospheric Chemistry ICEALOT Aerosol Size Distribution (DMPS) data 2026-05-12T15:20:04.706-07:00 Creation data.pmel.noaa.gov/pmel ACG_ICEALOT_Knorr_aerosol_sizedist_dmps Originator NOAA Coffman, Derek derek.coffman@noaa.gov index.html information web browser Background Information Background information from the source Information Pacific Marine Environmental Laboratory (PMEL) Size Distributions Aerosol inlet: Ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002]. The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air controlled to the indicated target sample RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol. DMPS (datasets denoted by _aerosol_sizedist_dmps_): One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to a tandem DMPS system that measured particle size distributions in the range of 0.020 to 0.8 micrometers Stokes diameter. The tandem DMPS consists of an "Aitken" DMPS (0.020 to 0.2 um) and an "Accumulation" DMPS (0.2 to 0.8 um). The distributions have been cleaned of all data from times of instrument malfunction or calibration. APS (datasets denoted by _aerosol_sizedist_aps_): One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to an APS that measured particle size distributions in the range of 0.96 to 10 micrometers Stokes diameter. The APS diameters are aerodynamic and have not been corrected to Stokes diameter via calculation or estimates of particle density. The APS data larger than 10 micrometers are not useful due to significant particle losses in the inlets including the ship's sampling mast, distribution tubing and APS inlet. The distributions have been cleaned of all data from times of instrument malfunction or calibration. Merged (datasets denoted by _aerosol_sizedist): These datasets include particle size distributions in the diameter range of 0.005 to 10 micrometers Stokes diameter. The distributions are a combination of DMPS and APS size distribution data where the APS diameters have been converted to Stokes diameters using densities calculated from measured chemistry. The diameter channels in the overlap region were chosen in the following manner: the last DMPS channel was discarded and, after converting to Stokes diameters, the first APS diameter channel that was larger than the last valid DMPS channel was chosen as the first APS channel. Each combined distribution was regridded onto a common set of diameters. Finally, the regridded distributions were cleaned to eliminate values at the larger sizes from the APS where "phantom" counts resulted in a spurious coarse mode in the surface and volume distributions. All datasets include number size distributions (normalized and non-normalized) as well as the higher moments for each: surface area and volume. Additional datasets may be included for a give project that include: - ambient (_ambient_): includes size distributions shifted to ambient RH using gRH factors - filter (_filter_): includes size distributions where additional cleaning was performed for periods of unstable CN concentrations Point of contact NOAA Coffman, Derek derek.coffman@noaa.gov index.html information web browser Background Information Background information from the source Information geoscientificInformation boundingExtent true -73.69599914550781 31.52985954284668 40.8974494934082 80.21768188476562 2008-03-20T12:00:00Z 2008-04-23T09:29:59Z 18.0 18.0 above aerosol area atmosphere atmospheric bin chemistry data datetime diameter distribution dlogDp dmps dNdlogDp dSdlogDp duration dVdlogDp earth environmental icealot identifier laboratory level log log-normal marine mean midpoint noaa normal normalized number pacific particle pmel science sea size station statistics stokes surface trajectory volume width Theme Earth Science > Atmosphere > Altitude > Station Height Theme GCMD Science Keywords ICEALOT Theme time latitude longitude altitude Theme CF Standard Name Table v70 These data were produced by NOAA and are not subject to copyright protection in the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0). ICEALOT Larger work citation Project Trajectory Unidata Common Data Model Trajectory Larger work citation Project ERDDAP_Subset ACG_ICEALOT_Knorr_aerosol_sizedist_dmps.subset search Subset Web page to facilitate selecting subsets of the dataset Download Physical measurement time double Datetime UTC diameter double midpoint Diameter(Stokes) trajectory_id String Trajectory ID latitude double Latitude longitude double Longitude altitude double height above mean sea level dNdlogDp double Normalized particle number size distribution (Log-normal) dNdlogDp_filter double Normalized particle number size distribution (Log-normal) dlogDp double diameter bin width dN double Particle number size distribution dSdlogDp double Normalized particle surface area distribution (Log-normal) dS double Particle surface area size distribution dVdlogDp double Normalized Particle volume distribution (Log-normal) dV double Particle volume size distribution dSdlogDp_filter double Normalized particle surface area size distribution (Log-normal) dVdlogDp_filter double Normalized particle volume size distribution (Log-normal) duration int Duration OPeNDAP DAP/2.0 Distributor NOAA/PMEL Science Data Integration Group +1 206-526-6744 Voice 7600 Sand Point way NE Seattle WA 98115 USA ellen.koukel@noaa.gov ERDDAP administrator OPeNDAP DAP/2.0 ACG_ICEALOT_Knorr_aerosol_sizedist_dmps.html order Data Subset Form ERDDAP's version of the OPeNDAP .html web page for this dataset. Specify a subset of the dataset and download the data via OPeNDAP or in many different file types. Download ACG_ICEALOT_Knorr_aerosol_sizedist_dmps.graph order Make-A-Graph Form ERDDAP's Make-A-Graph .html web page for this dataset. Create an image with a map or graph of a subset of the data. Download This record was created from dataset metadata by ERDDAP Version 2.30.0 Dataset dataset Service service