CEAREX was a multi-platform field program conducted in the Norwegian Seas and Greenland north to Svalbard from September 1988 through May 1989. Canada, Denmark, France, Norway and the United States participated in the experiment. Primary data from CEAREX are available on CD-ROM in ASCII format along with some data from the Marginal Ice Zone Experiment (MIZEX) and the Eurasian Basin Experiment ... (EUBEX). CD-ROM production was supported by the Arctic Program of the Office of Naval Research (ONR). Meteorology data from CEAREX and the MIZEX (1983, 1984, 1987) include near-surface time series and rawinsonde (upper-air sounding) profiles of wind, pressure, temperature, and humidity collected on ship platforms and ice floe stations. A collection of hydrography data include CTD, STD, and bottle data from a ship and two operations camps. Hydrography data also include data from the MIZEX, the EUBEX, NODC archives, and a merged set of data from five other cruises. Sea ice data consist of compressive stress measurements made in a multi-year floe, stress sensor data for time series of stress invariants, and ice accelerometer data for movements associated with the deformation of multi-year ice floes. Noise data consist of acoustic measurements from a variety of hydrophone and geophone arrays, and ambient noise observations from a ship using omni-directional hydrophones tethered beneath the ice cover. Biophysical data on the CD-ROM include bottle sample, zooplankton sampling, and bioluminescence data. Bathymetry data consist of gridded trackline data collected from the two operations camps, and digital bottom bathymetry and continental topography data for the Fram Strait region and a portion of the Arctic Ocean. Sample position data consist of hourly listings of position and velocity for both manned stations and unmanned drifting buoys. Data are available on one CD-ROM.
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Data Set Citation
Coordinated Eastern Arctic Experiment (CEAREX) Data
Dataset Release Place:
Boulder, CO U.S.A.
National Snow and Ice Data Center (NSIDC)
ATTRIBUTE ACCURACY REPORT: The sea surface height shall be provided with a global and ultimate rms accuracy of 3.4 cm (1 sigma) over 1 second averages along JASON-1 ground-tracks for typical sea-state conditions of 2 m SWH and 11 dB sigma-naught. The accuracy on wind speed in IGDR products shall be 1.6 m/s. Near Real Time Altimeter Validation System Reports (NRTAVS)are daily and cover the previous ... 10-day period; distributed through the CLASS system at http://www.nsof.class.noaa.gov/saa/products/
LOGICAL CONSISTENCY REPORT: Instrument calibrations and product quality shall be monitored at least weekly throughout the life of the mission. For each file sent, the Archive performs file validation of the following: file name, file size, and file checksum. CLASS currently performs file name validation. CLASS performs checksum algorithm and routines for additional validation in accordance with the NOAA Environmental Satellite Processing Center (ESPC) to the CLASS Interface Control Document (ICD). OSTM/Jason-2: NRTAVS QA Reports - Quality Reports from the Near Real-Time Altimetry Validation System (NRTAVS). Reports are daily and cover the previous 10-day period; distributed through CLASS at http://www.nsof.class.noaa.gov/saa/products/
COMPLETENESS REPORT: Validation failure will result in placing the file in a hold state. The Access Contact for the Producer will be contacted by CLASS Operations personnel. Information about updates and edits to Jason-2 data is available through CLASS at http://www.class.ncdc.noaa.gov/notification/news.htm#5
HORIZONTAL POSITIONAL ACCURACY REPORT: The orbit maintenance requirements for altimetry missions are usually that the deviation of the actual ground track from the nominal one is kept below 1 km and that the mean local nodal crossing time matches the nominal one to better than to within five minutes. The orbit maintenance strategy aims for minimum disturbance of the payload operation. In-plane manoeuvres are used for altitude adjustment to compensate for the effects of air-drag. This altitude decay controls affects the ground-track repeatability, mainly in the equatorial regions. The frequency of these manoeuvres is determined by the rate of orbital decay, which in turn is determined by the air density, and this is a function of solar activity. The nominal rate for these in-plane manoeuvres is nominally twice a month. They do not interrupt the operations of most sensors. Out-of-plane corrections are used to correct rectify the steady drift of inclination mainly caused by solar and lunar gravity perturbations. The solar wind also influences inclination, but its contribution is typically an order of magnitude smaller than the one given made by solar and lunar gravity. Inclination drift degrades ground-track maintenance at high latitudes. The drift rate does not depend on air density and corrections are required every few months. As they are out-of-plane they require a 90-degree rotation of the spacecraft, to align the thrusters with the required thrust direction, so these manoeuvres will are performed in during eclipse to avoid the risk of optical sensors viewing the sun. Jason-2's orbit is identical to that of Jason-1 (and that of Topex/Poseidon previously). It is optimized to study large-scale ocean variability and to provide coverage of 90% of the world's oceans over a ten-day cycle. Jason-2's high altitude (1,336 kilometres) reduces interactions with the Earth's atmosphere and gravity field to a minimum, thus making orbit determination easier and more precise.
VERTICAL POSITIONAL ACCURACY REPORT: Please see the horizontal positional report. Specific to OSTM/Jason-2: Orbital information is distributed through CLASS at http://www.nsof.class.noaa.gov/saa/products/. The satellites Topex/Poseidon, Jason-1, and Jason-2 (OSTM) carry three tracking systems (DORIS, GPS, and laser telemetry) that enable their position in space (ephemeris) to be determined with an accuracy of +/- 1 cm.
LINEAGE/PROCESS STEP: PROCESS DESCRIPTION: Raw telemetry downlinked to the ground stations is forwarded to the quality control and processing centres. Telemetry is then processed to obtain level 1 data, i.e., data that are timed and located, expressed in the appropriate units, and checked for quality. (Jason-2's ground segment is a distributed system between NASA, CNES, Eumetsat and NOAA. On the terms and conditions specified with the quadripartite agreement for the Jason-2 project: Raw data of the Poseidon3 altimeter, DORIS and the radiometer are processed by the NOAA and Eumetsat centres to product near-real time altimetry data (OGDR); Raw data of the Poseidon-3 altimeter and the radiometer are only processed by the mission centre at CNES to product delayed time altimetry data (IGDR; S-IGDR, GDR and S-GDR).
LINEAGE/PROCESS STEP: PROCESS DESCRIPTION: NASA JPL and NOAA LSA are responsible for developing the Quality Reports from the Near Real-Time Altimetry Validation System (NRTAVS). Reports are daily and cover the previous 10-day period. SOURCE USED CITATION ABBREVIATION: Jason-2 QA PROCESS DATE: Not complete PROCESS DATE: 20081215 SOURCE PRODUCED CITATION ABBREVIATION: gov.noaa.class:J2_QA
LINEAGE/SOURCE INFORMATION: ORIGINATOR: DOC/NOAA/NESDIS/OSDPD > Office of Satellite Data Processing and Distribution, NESDIS, NOAA, U.S. Department of Commerce and, .
LINEAGE/SOURCE INFORMATION: ORIGINATOR: EUMETSAT > European Meteorological Satellite Organisation . TITLE: OSTM/Jason-2: Telemetry (restricted)(J2-TEL) . PUBLICATION DATE: 2008-07-. PUBLICATION PLACE: Silver Spring, MD . PUBLISHER: NOAA National Oceanographic Data Center . GEOSPATIAL DATA PRESENTATION FORM: CCSDS packet files . OTHER CITATION DETAILS: These data are archived at the NODC under accession number 0044986. All telemetry data (J2-TEL) are restricted to the project team, per the mission's 4-partner Memorandum of Understanding. For these restricted data families, users will only see listed those datatypes upon which they can search. ONLINE LINKAGE: http://www.nodc.noaa.gov/cgi-bin/search/prod/accessionsView.pl/deta... . TYPE OF SOURCE MEDIA: digital files (CCSDS packet files) via FTP . SOURCE TIME PERIOD OF CONTENT/BEGINNING TIME: 20081215 . SOURCE TIME PERIOD OF CONTENT/ENDING TIME: Present . SOURCE CURRENTNESS REFERENCE: ground condition . SOURCE CITATION ABBREVIATION: Jason-2 telemetry (level 0) data . SOURCE CONTRIBUTION: Telemetry - Dataset consists of raw Level-0 telemetry data from the Jason-2 spacecraft. There are three datatypes available: Housekeeping Telemetry - Recorded (HKTM-R) is stored on the spacecraft for later downlink; Payload Telemetry 1 (PLTM-1) is the payload science data from the core-mission payloads: Poseidon-3, DORIS, AMR, and GPSP; and Payload Telemetry 2 (PLTM-2) is the payload science data from the passenger mission of opportunity payloads: CARMEN-2, L2T2 and LPT. They are available as CCSDS packet files. All telemetry data (J2-TEL) are restricted to the project team, per the mission's 4-partner Memorandum of Understanding.
ACCESS CONSTRAINTS: All telemetry data are restricted to the project team and users will only see listed those datatypes upon which they can search.
DISTRIBUTION LIABILITY: While NESDIS makes every effort to ensure that its databases are error-free, errors do occur. We ask that you notify us immediately of any errors that you discover in our data. We will make every effort to correct ... them. With respect to documents available from this server, neither the United States Government nor any of its employees, makes any warranty, express or implied, including the warranties of merchantability and fitness for a particular purpose; nor assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed; nor represents that its use would not infringe privately owned rights.
DISTRIBUTION LIABILITY: While NODC makes every effort to ensure that its databases are error-free, errors do occur. We ask that you notify us immediately of any errors that you discover in our data. We will make every effort to correct them. With respect to documents available from this server, neither the United States Government nor any of its employees, makes any warranty, express or implied, including the warranties of merchantability and fitness for a particular purpose; nor assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed; nor represents that its use would not infringe privately owned rights.
CUSTOM ORDER PROCESS: Contact the NODC User Services group or CLASS support at www.nsof.class.noaa.gov/release/index.htm CUSTOM ORDER PROCESS: Please contact the NODC User Services Group at NODC.Services@noaa.gov.
All telemetry data are restricted to the project team.