Table 1. Locations of Stations and Length of Records in All Measurement Programsa

Measurement Program	Station Name	Latitude	Longitude	Time
NOAA flask	Alert (ALT)	82degreesN	62degreesW	2/1988-12/1995; 12/1994-8/2002
	Barrow (BRW)	71degreesN	157degreesW	9/1977-12/1995; 12/1994-10/2002
	Niwot Ridge (NWR)	40degreesN	106degreesW	8/1977-12/1995; 1/1995-10/2002
	Cape Kumukahi (KUM)	19degreesN	155degreesW	11/1995-10/2002
	Mauna Loa (MLO)	19degreesN	156degreesW	9/1977-12/1995; 1/1995-10/2002
	Cape Matatula (SMO)	14degreesS	171degreesW	10/1977-12/1995; 11/1994-10/2002
	Cape Grim (CGO)	40degreesS	145degreesE	5/1991-12/1995; 2/1995-10/2002
	South Pole (SPO)	90degreesS	102degreesW	5/1977-12/1995; 3/1995-2/2002
CATS	Barrow (BRW)	71degreesN	157degreesW	6/1998-12/2004
	Niwot Ridge (NWR)	40degreesN	106degreesW	1/2001-11/2004
	Mauna Loa (MLO)	19degreesN	156degreesW	12/1999-12/2004
	Cape Matatula (SMO)	14degreesS	171degreesW	1/1999-12/2004
	South Pole (SPO)	90degreesS	102degreesW	1/1998-12/2004
AGAGE	Mace Head (MHD)	53degreesN	10degreesW	3/1994-3/2003
	Trinidad Head	45degreesN	124degreesW	10/1995-3/2003
	Ragged Point	13degreesN	59degreesW	7/1996-3/2003
	Cape Matatula (SMO)	14degreesS	171degreesW	9/1996-3/2003
	Cape Grim (CGO)	40degreesS	145degreesE	9/1993-3/2003
RITS	Barrow (BRW)	71degreesN	157degreesW	9/1987-2/1999
	Niwot Ridge (NWR)	40degreesN	106degreesW	2/1990-8/2001
	Mauna Loa (MLO)	19degreesN	156degreesW	6/1987-4/2000
	Cape Matatula (SMO)	14degreesS	171degreesW	9/1987-4/2000
	South Pole (SPO)	90degreesS	102degreesW	1/1989-11/2000
aThe data are available from the following websites: NOAA flask: ftp://ftp.cmdl.noaa.gov/hats/n2o/flasks/; CATS: ftp://ftp.cmdl.noaa.gov/hats/n2o/insituGCs/CATS/global/insitu_global_N2O; AGAGE: http://cdiac.ornl.gov/ftp/ale_gage_Agage/AGAGE/gc-md/monthly/; RITS: ftp://ftp.cmdl.noaa.gov/hats/n2o/insituGCs/RITS/.