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Ancillary Descriptions

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Ecological Monitoring and Assessment Network Data Set Library (Hosted By Environment Canada)

Entry ID: Canada_EC_EMAN

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Summary

Abstract: The Ecological Monitoring and Assessment Network (EMAN) Data Set Library hosted
by Environment Canada is a metadata resource of data sets and research
activities that are associated with the mosaic of partners and research sites
that make up EMAN. The EMAN was set up to look at what is changing across
Canada's environment. Metadata within the Data Set Library pertains to ...

Related URL

Link: View Related Information

Description: GeoConnections Discovery Portal. Canada's IDN Node.

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: 84.0

S: 42.0

E: -52.0

W: -141.0

Data Set Citation

Dataset Originator/Creator: Government of Canada, Environment Canada, Ecological Monitoring and Assessment Network

Dataset Title: Ecological Monitoring and Assessment Network Data Set Library (Hosted By Environment Canada)

Online Resource: http://metadata.cciw.ca/

Temporal Coverage

Start Date: 1999-01-01

Stop Date: 2025-12-31

Location Keywords

CONTINENT > NORTH AMERICA > CANADA > HUDSON BAY

CONTINENT > NORTH AMERICA > CANADA

Science Keywords

ATMOSPHERE > AIR QUALITY

ATMOSPHERE > ATMOSPHERIC CHEMISTRY

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

OCEANS

Platform

COASTAL STATIONS

BUOYS

SHIPS

Instrument

ANEMOMETERS

BAROMETERS

WIND VANES

ANEROID PRESSURE SENSOR

Project

ESIP > Earth Science Information Partners Program

Quality ATTRIBUTE ACCURACY REPORT: Not provided

LOGICAL CONSISTENCY REPORT: Unknown

COMPLETENESS REPORT: No attempt was made to extract wind data over the North Atlantic Ocean, for the years 1927-1929, 1933-1934 inclusive. Only low pressure areas with at least one closed isobar were considered, and shallow lows that maintained their identity for less than ... two consecutive 1200 GMT charts were discarded. Tropical storms were not included except at a period in their history when they began to take on the appearance of extra-tropical cyclones. On a few occasions, during the years 1924 through 1926 over the North Atlantic Ocean, pressure differences were recorded for only three directions if there was a lack of isobar symmetry in one direction.

LINEAGE/PROCESS STEP:
PROCESS DESCRIPTION: DSI-9628 is one of NCDC's older data sets (originally it was called Card Deck 627), and was derived from a still older source data set, "Northern Hemisphere Historical Map Series, source 005". No documentation for the older source data set has survived. The oldest surviving DSI-9628 documentation describes the source data set as a 40 year series. The maps used from the "Northern Hemisphere Historical Map Series" were from the 15 year period 1924 through 1938. The part of the Northern Hemisphere used in this data is outlined by the following Marsden squares: (numbers are inclusive) 074-082, 109- 117, 140-153, 176-190, 214-226, 248-252 and 284-288 in the North Atlantic; and 093-097, 121-132, 157-167, 194-203, 233-235 in the North Pacific Ocean. The year, month, day, and location (by Marsden square number) were punched for each low pressure area occurring within the geographical boundaries outlined above. The isobaric difference between the center of each low pressure area and a point 400 statute miles from the center was computed separately for each of the four directions: North, East, South and West. Wind velocities to the nearest Beaufort Force were taken directly from plotted data on the map when available and when considered representative. No attempt was made to extract wind data over the North Atlantic Ocean, for the years 1927-1929, 1933-1934 inclusive. The mean pressure difference was computed by machine methods and entered in whole millibars and tenths, daily for each storm. Only low pressure areas with at least 1 closed isobar were considered, and shallow lows that maintained their identity for less than two consecutive 1200 GMT charts were discarded. Tropical storms were not included except at a period in their history when they began to take on the appearance of extra-tropical cyclones. For the sake of convenience and to facilitate the extraction of pressure differences from the map, an overlay with two circles was drawn to scale and having 400 mile radii was constructed. The first circle was drawn to map scale at 60 degrees latitude and was used to compute pressure difference north of 45 degrees latitude. The second circle drawn to map scale at 30 degrees latitude was used in computation at 45 degrees latitude and below. On some occasions, the centers of two low pressure areas were close together and the highest pressure in one of the four cardinal directions was well within the 400 mile circle. In such cases the pressure difference was taken by using the value at the highest point within the circle, in that particular direction, rather than at the edge of the circle. On a few occasions, during the years 1924 through 1926 over the North Atlantic Ocean, pressure differences were recorded for only three directions if there was a lack of isobar symmetry in one direction. The number of directions was taken into consideration when computing mean pressure differences.
PROCESS DATE: Unknown

Access Constraints ACCESS CONSTRAINTS: None

DISTRIBUTION LIABILITY: Every effort has been made to ensure that these data are accurate and reliable within the limits of current NOAA quality control procedures. NOAA can only certify that the data provided to its customers is an authentic copy of the records which were accepted for inclusion in NOAA archives. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

Use Constraints None

Ancillary Keywords

EUROPE

MIDDLE EAST

Data Set Progress

COMPLETE

Originating Center

Data Center

National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce

Data Center URL: http://www.ncdc.noaa.gov/
Dataset ID: ______DSI-9628 ____

Data Center Personnel
Name: NCDC CUSTOMER SERVICE Phone: 828-271-4800 Fax: 828-271-4876 Email: ncdc.orders at noaa.gov Contact Address: 151 Patton Avenue, Room 120 City: Asheville Province or State: NC Postal Code: 28801-5001 Country: USA