The Pacific Marine Environmental Laboratory's ERDDAP data server for public access to scientific data
NOAA OAR PMEL
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Easy Access to PMEL Scientific Data
The Pacific Marine Environmental Laboratory's ERDDAP data server for public access to scientific data |
NOAA OAR PMEL |
| Dataset Title: | PMEL Atmospheric Chemistry ICEALOT CCN data
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| Institution: | NOAA (Dataset ID: ACG_ICEALOT_Knorr_ccn) |
| Range: | longitude = -73.69604 to 31.52986°E, latitude = 40.89723 to 80.21772°N, altitude = 18.0 to 18.0m, time = 2008-03-19T12:00:00Z to 2008-04-24T05:59:00Z |
| Information: | Summary
| License
| FGDC
| ISO 19115
| Metadata
| Background
| Subset
| Data Access Form
| Files
|
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Click on the map to specify a new center point.
Zoom:
![[The graph you specified. Please be patient.]](https://data.pmel.noaa.gov/pmel/erddap/tabledap/ACG_ICEALOT_Knorr_ccn.png?longitude,latitude,duration&time%3E=2008-04-18T00%3A00%3A00Z&time%3C=2008-04-25T00%3A00%3A00Z&.draw=markers&.marker=5%7C5&.color=0x000000&.colorBar=%7C%7C%7C%7C%7C&.bgColor=0xffccccff)
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Attributes {
s {
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.205928e+9, 1.20901674e+9;
String axis "T";
String comment "Start of sampling period";
String coords "time";
String ioos_category "Time";
String long_name "Datetime UTC";
String source_name "datetime_utc";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01T00:00:00Z";
String units "seconds since 1970-01-01T00:00:00Z";
}
trajectory_id {
String cf_role "trajectory_id";
String coords "time";
String ioos_category "Identifier";
String long_name "Trajectory ID";
}
duration {
Int32 _FillValue 2147483647;
Int32 actual_range 60, 60;
String coords "time";
String ioos_category "Time";
String long_name "Duration";
String units "second";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 actual_range 40.89723, 80.21772;
String axis "Y";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String coords "time";
String instrument "GPS";
String ioos_category "Location";
String long_name "Latitude";
String source "surface observation";
String standard_name "latitude";
String units "degrees_north";
Float64 valid_max 90.0;
Float64 valid_min -90.0;
}
longitude {
String _CoordinateAxisType "Lon";
Float64 actual_range -73.69604, 31.52986;
String axis "X";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String coords "time";
String instrument "GPS";
String ioos_category "Location";
String long_name "Longitude";
String source "surface observation";
String standard_name "longitude";
String units "degrees_east";
Float64 valid_max 180.0;
Float64 valid_min -180.0;
}
altitude {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "up";
Float64 actual_range 18.0, 18.0;
String axis "Z";
Float64 colorBarMinimum 0.0;
String coords "time";
String ioos_category "Location";
String long_name "height above mean sea level";
String positive "up";
String standard_name "altitude";
String units "m";
Float64 valid_min 0.0;
}
ccn_ss {
Float64 _FillValue NaN;
Float64 actual_range 0.2, 1.0;
Float64 colorBarMaximum 100.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "Cloud Condensation Nuclei Counter";
String ioos_category "Unknown";
String long_name "Supersaturation of CCN measurement";
String source "surface observation";
String units "percent";
}
ccn {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 31050.7;
Float64 colorBarMaximum 60000.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "Cloud Condensation Nuclei Counter";
String ioos_category "Meteorology";
String long_name "Cloud Condensation Nuclei Concentration at ccn_ss";
String source "surface observation";
String units "cm-3";
Float64 valid_max 50000.0;
Float64 valid_min 0.0;
}
ccn_cn_ratio {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 1.47;
Float64 colorBarMaximum 1.5;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "Cloud Condensation Nuclei Counter";
String ioos_category "Unknown";
String long_name "Ratio of CCN to CN";
String source "surface observation";
Float64 valid_max 1.0;
Float64 valid_min 0.0;
}
}
NC_GLOBAL {
String cdm_data_type "Trajectory";
String cdm_trajectory_variables "trajectory_id";
String contributor_name "Coffman, Derek/NOAA-PMEL/Address: 7600 Sand Pt. Wy. NE,Seattle,WA 98115 /email: derek.coffman@noaa.gov";
String Conventions "COARDS, CF-1.6, ACDD-1.3, NCCSV-1.0";
String creator_email "derek.coffman@noaa.gov";
String creator_name "Coffman, Derek";
String creator_url "https://www.pmel.noaa.gov/";
String dimensions "time=51480";
Float64 Easternmost_Easting 31.52986;
String featureType "Trajectory";
Float64 geospatial_lat_max 80.21772;
Float64 geospatial_lat_min 40.89723;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max 31.52986;
Float64 geospatial_lon_min -73.69604;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 18.0;
Float64 geospatial_vertical_min 18.0;
String geospatial_vertical_positive "up";
String geospatial_vertical_units "m";
String history
"2025-05-09T20:46:46Z (local files)
2025-05-09T20:46:46Z https://data.pmel.noaa.gov/pmel/tabledap/ACG_ICEALOT_Knorr_ccn.das";
String infoUrl "https://www.pmel.noaa.gov/acg/data/index.html";
String institution "NOAA";
String keywords "above, altitude, atmosphere, atmospheric, ccn, ccn_cn_ratio, ccn_ss, chemistry, cloud, cloud cover, cloudiness, concentration, condensation, cover, data, datetime, duration, earth, Earth Science > Atmosphere > Altitude > Station Height, environmental, height, icealot, identifier, laboratory, latitude, level, longitude, marine, mean, measurement, meteorology, noaa, nuclei, pacific, pmel, ratio, science, sea, station, supersaturation, time, trajectory, trajectory_id";
String keywords_vocabulary "GCMD Science Keywords";
String license "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).";
Float64 Northernmost_Northing 80.21772;
String platform "Knorr";
String product_version "0";
String project "ICEALOT";
String sourceUrl "(local files)";
Float64 Southernmost_Northing 40.89723;
String standard_name_vocabulary "CF Standard Name Table v70";
String subsetVariables "trajectory_id, duration, altitude";
String summary
"A NOAA Contribution for the International Polar Year 2008.
The International Chemistry Experiment in the Arctic Lower Troposphere (ICEALOT) was conducted in the North Atlantic and Arctic Oceans in March and April 2008 as part of the larger POLARCAT program. Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements from March 19 to April 24 aboard the R/V Knorr during this project.";
String target_sample_rh "25%";
String time_coverage_end "2008-04-24T05:59:00Z";
String time_coverage_start "2008-03-19T12:00:00Z";
String title "PMEL Atmospheric Chemistry ICEALOT CCN data";
Float64 Westernmost_Easting -73.69604;
}
}
Data Access Protocol (DAP) and its
selection constraints.
The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.
Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names,
followed by a collection of
constraints (e.g., variable<value),
each preceded by '&' (which is interpreted as "AND").
For details, see the tabledap Documentation.