GLOBALVIEW-CH4, 2009
  1. Release Date: 28 October 2009
  2. Data additions
    Discrete surface measurements:
    • BHD Baring Head, New Zealand (ESRL in collaboration with National Institute of Water and Atmospheric Research (NIWA))
    • LMP Lampedusa, Italy (ESRL in collaboration with National Agency for New Technology, Energy, and Environment (ENEA))
    • LPO Ile Grande, France (LSCE)
    • PUY Puy de Dome, France (LSCE)
    Continuous surface or short-tower measurements:
    • ETL105 East Trout Lake, Saskatchewan, Canada (EC)
    • LLB010 Lac La Biche, Alberta, Canada (EC)
  3. Sampling Strategy
    We have introduced the sampling strategy "P" to make a distinction between single flasks (D) and flask packages. See File Names for details.
GLOBALVIEW-CH4, 2008
  1. Release Date: 5 August 2008
  2. Data additions
    Discrete surface measurements:
    • BKT Bukit Kototagang, Indonesia (ESRL)
    • CYA Casey, Antarctica, Australia (CSIRO)
    • HPB Hohenpeissenberg, Germany (ESRL)
    • MKN Mt. Kenya, Kenya (ESRL)
    • PTA Point Arena, California, United States (ESRL)
    • SGP374 Southern Great Plains, Oklahoma, United States (ESRL)
    Discrete measurements from aircraft:
    • BNE Beaver Crossing, Nebraska, United States (ESRL)
    • DND Dahlen, North Dakota, United States (ESRL)
    • HIL Homer, Illinois, United States (ESRL)
    • LEF Park Falls, Wisconsin, United States (ESRL)
    • NHA Worcester, Massachusetts, United States (ESRL)
    • TGC Sinton, Texas, United States (ESRL)
    • THD Trinidad Head, California, United States (ESRL)
    • WBI West Branch, Iowa, United States (ESRL)
    Continuous surface measurements:
    • EGB Egbert, Ontario, Canada (EC)
  3. Site Code Change
    EC no longer makes measurements from the 23 magl intake height (CDL023). EC continues to make measurements from the 30 magl intake height and the record used here is based on measurements from the 30 magl intake height (CDL030).
  4. Lab Change
    • Collaborating laboratory 06, formerly called "Meteorological Service of Canada" (MSC), is now called "Environment Canada" (EC).
    • Collaborating laboratory 27, formerly called "Instituto Nacional de Meteorologia" (INM), is now called "Meteorological State Agency of Spain" (AEMET).
GLOBALVIEW-CH4, 2005
  1. Release Date: 1 September 2005
  2. Data additions
    Discrete surface measurements:
    • ALT Alert, Nunavut, Canada (MSC)
    • BGU Begur, Spain (LSCE)
    • ESP Estevan Point, British Columbia, Canada (MSC)
    • MCM McMurdo Station, Antarctica (CMDL)
    • PDM Pic Du Midi, France (LSCE)
    • SUM Summit, Greenland (CMDL)
    • TRM Tromelin Island, France (LSCE)
    Discrete measurements from aircraft:
    • ESP Estevan Point, British Columbia, Canada (CMDL)
    • HFM Harvard Forest, Massachusetts, United States (CMDL)
    • RTA Rarotonga, Rarotonga (CMDL)
    Continuous surface measurements:
    • CGO Cape Grim, Tasmania, Australia (AGAGE)
    • IZO Izana, Tenerife, Canary Islands, Spain (INM)
    • MHD Mace Head, Ireland (AGAGE)
    • MNM Minamitorishima, Japan (JMA)
    • RPB Ragged Point, Barbados (AGAGE)
    • RYO Ryori, Japan (JMA)
    • SBL Sable Island, Canada (MSC)
    • SMO American Samoa (AGAGE)
    • THD Trinidad Head, California, United States (AGAGE)
    • YON Yonagunijima, Japan (JMA)
    Continuous surface from a short tower:
    • FRD040 Fraserdale, Ontario, Canada (MSC)
    • OBS023 Saskatchewan, Canada (MSC)
  3. Lab Identification Number Change
    The Lab ID number for NOAA ESRL has been changed from 00 to 01.
  4. Modifications to the Preparation and Use of Tower Data
    Preparation of semi-continuous measurements from sites designated as tower platforms has been modified in an effort to standardize the treatment of data from towers sampling at one or many levels.

    Tower data are now averaged with daily resolution using afternoon hours only. In earlier releases of this data product, daily averages were computed using all hours (e.g., 24-hour average).

    The residual distribution used to prepare the statistical summary of average diurnal cycles is now determined at each level by subtracting the afternoon-hour average mixing ratio for each day from every observation for that day. In earlier releases of this product, the residual distribution was determined at each level by subtracting the 24-hour average mixing ratio for each day from every observation for that day; for tall tower measurements, the 24-hour average was determined from measurements at the highest level.

  5. Lab Name Change
    As of October 1, 2005, the Climate Monitoring and Diagnostics Laboratory (CMDL) has merged into the Earth System Research Laboratory (ESRL) as part of its Global Monitoring Division (GMD).
GLOBALVIEW-CH4, 2001
  1. Release Date: 15 August 2001
  2. Data additions
    Continuous surface measurements:
    • ALT Alert, Nunavut, Canada (MSC)
    • COI Cape Ochi-ishi, Japan (NIES)
    • HAT Hateruma Island, Japan (NIES)
    Continuous measurements from tall towers:
    • LEF Park Falls, Wisconsin, United States (CMDL)
    Discrete surface measurements:
    • KZD Sary Taukum, Kazakstan (CMDL)
    • KZM Plateau Assy, Kazakstan (CMDL)
    • TDF Tierra Del Fuego, Argentina (CMDL)
    Discrete measurements from aircraft:
    • HAA Molokai Island, Hawaii, United States (CMDL)
    • PKA Poker Flats, Alaska, United States (CMDL)
  3. Modifications to the Data Extension procedure (see Version History GLOBALVIEW-CO2, 2000).