The Network-at-a-Glance page displays summary statistics about the AmeriFlux network, its flux tower sites, data sets, and user community. This provides a useful snapshot to PIs, Program Managers, data users, and others.
Last update: Apr 4, 2026 10:20AM PST
Sites
- Sites registered in AmeriFlux 811
- Sites that have downloadable flux data 583
- Site years of downloadable AmeriFlux BASE data 4339
- Site years of downloadable AmeriFlux FLUXNET data 2178
- Number of AmeriFlux Core Sites 43
- Number of Registered AmeriFlux Sites by Year
Show Chart Data| Years | Number of AmeriFlux Sites | | 1991 | 1 |
| 1993 | 2 |
| 1994 | 3 |
| 1995 | 4 |
| 1996 | 6 |
| 1997 | 12 |
| 1998 | 15 |
| 1999 | 24 |
| 2000 | 29 |
| 2001 | 46 |
| 2002 | 59 |
| 2003 | 66 |
| 2004 | 86 |
| 2005 | 95 |
| 2006 | 100 |
| 2007 | 118 |
| 2008 | 120 |
| 2009 | 123 |
| 2011 | 126 |
| 2012 | 127 |
| 2013 | 170 |
| 2014 | 210 |
| 2015 | 235 |
| 2016 | 262 |
| 2017 | 301 |
| 2018 | 386 |
| 2019 | 472 |
| 2020 | 522 |
| 2021 | 559 |
| 2022 | 590 |
| 2023 | 637 |
| 2024 | 689 |
| 2025 | 793 |
| 2026 | 811 |
- Five most recent sites to join the Network
| Site ID | Join Date | | CA-GL4 | 2026/03/27 |
| US-KEY | 2026/02/23 |
| US-Ha3 | 2026/02/11 |
| US-LCW | 2026/02/05 |
| US-SBR | 2026/02/05 |
Geography
- Sites by country
| Country | Site Count | | Argentina | 7 |
| Brazil | 23 |
| Canada | 90 |
| Chile | 5 |
| Colombia | 2 |
| Costa Rica | 5 |
| Mexico | 16 |
| Panama | 2 |
| Peru | 5 |
| Puerto Rico | 2 |
| USA | 654 |
- Sites in each IGBP landcover
Show Chart Data| IGBP | Site Count | | Barren Sparse Vegetation | 9 |
| Closed Shrublands | 15 |
| Cropland/Natural Vegetation Mosaics | 20 |
| Croplands | 194 |
| Deciduous Broadleaf Forests | 60 |
| Deciduous Needleleaf Forests | 1 |
| Evergreen Broadleaf Forests | 20 |
| Evergreen Needleleaf Forests | 113 |
| Grasslands | 113 |
| Mixed Forests | 20 |
| Open Shrublands | 50 |
| Permanent Wetlands | 130 |
| Savannas | 10 |
| Snow and Ice | 1 |
| Urban and Built-Up Lands | 24 |
| Water Bodies | 16 |
| Woody Savannas | 15 |
Registered AmeriFlux Members
- AmeriFlux members 23396
- New AmeriFlux members in the past year 3445
Downloads of AmeriFlux BASE flux data since November, 2015
(from ameriflux.lbl.gov)
- Total unique downloads 70453
- AmeriFlux sites whose data have been downloaded 583
- Users who have downloaded AmeriFlux BASE flux data 7995
- How do people use the AmeriFlux BASE flux data?
Show Chart Data| Intended Use | Use Count | | Education (Teacher or Student) | 10064 |
| Other | 5998 |
| Research - Land model/Earth system model | 26850 |
| Research - Multi-site synthesis | 7554 |
| Research - Other | 8940 |
| Research - Remote sensing | 11047 |
Downloads of AmeriFlux FLUXNET data since September, 2021
(from ameriflux.lbl.gov)
- Total unique downloads 19352
- AmeriFlux sites whose data have been downloaded 300
- Users who have downloaded AmeriFlux FLUXNET data 4244
- How do people use the AmeriFlux FLUXNET data?
Show Chart Data| Intended Use | Use Count | | Other | 4644 |
| Research - Other | 2693 |
| Research - Remote sensing | 3705 |
| Education (Teacher or Student) | 3343 |
| Research - Multi-site synthesis | 2699 |
| Research - Land model/Earth system model | 2268 |
Downloads of FLUXNET2015 data since January, 2016
(from fluxnet.org)
- Total unique downloads 46565
- AmeriFlux sites whose data have been downloaded 86
- Users who have downloaded FLUXNET2015 data for AmeriFlux sites 9787
- How do people use the FLUXNET2015 data?
Show Chart Data| Intended Use | Use Count | | Education (Teacher or Student) | 10092 |
| Other | 5994 |
| Research - Land model/Earth system model | 8572 |
| Research - Multi-site synthesis | 7024 |
| Research - Other | 3020 |
| Research - Remote sensing | 11863 |
AmeriFlux Data & Data Processing
- AmeriFlux BASE Site Years Availability
Show Chart Data| Years | Published | Pending QA/QC | | 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 5 | 0 |
| 1995 | 7 | 0 |
| 1996 | 10 | 0 |
| 1997 | 19 | 0 |
| 1998 | 26 | 1 |
| 1999 | 36 | 1 |
| 2000 | 43 | 1 |
| 2001 | 66 | 0 |
| 2002 | 83 | 2 |
| 2003 | 96 | 2 |
| 2004 | 119 | 3 |
| 2005 | 128 | 4 |
| 2006 | 121 | 5 |
| 2007 | 125 | 9 |
| 2008 | 137 | 11 |
| 2009 | 142 | 13 |
| 2010 | 144 | 15 |
| 2011 | 146 | 13 |
| 2012 | 151 | 17 |
| 2013 | 163 | 25 |
| 2014 | 171 | 24 |
| 2015 | 182 | 29 |
| 2016 | 192 | 30 |
| 2017 | 235 | 23 |
| 2018 | 250 | 20 |
| 2019 | 265 | 12 |
| 2020 | 243 | 17 |
| 2021 | 245 | 20 |
| 2022 | 230 | 23 |
| 2023 | 232 | 26 |
| 2024 | 222 | 26 |
| 2025 | 100 | 23 |
| 2026 | 2 | 0 |
- AmeriFlux BASE Site Years Available by IGBP
Show Chart Data| Years | BSV | CRO | CSH | CVM | DBF | DNF | EBF | ENF | GRA | MF | OSH | SAV | SNO | URB | WAT | WET | WSA | | 1991 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1992 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1993 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1994 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 |
| 1995 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 0 |
| 1996 | 0 | 1 | 0 | 0 | 4 | 0 | 0 | 3 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
| 1997 | 0 | 2 | 2 | 0 | 4 | 0 | 1 | 7 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1998 | 0 | 2 | 2 | 0 | 5 | 0 | 1 | 10 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 0 |
| 1999 | 0 | 2 | 3 | 0 | 6 | 0 | 2 | 15 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 4 | 0 |
| 2000 | 0 | 2 | 3 | 0 | 8 | 0 | 2 | 17 | 4 | 2 | 0 | 0 | 0 | 0 | 0 | 5 | 0 |
| 2001 | 0 | 4 | 3 | 0 | 9 | 0 | 3 | 29 | 6 | 3 | 3 | 0 | 0 | 0 | 0 | 5 | 1 |
| 2002 | 0 | 4 | 3 | 0 | 13 | 0 | 3 | 38 | 8 | 3 | 5 | 0 | 0 | 0 | 0 | 5 | 1 |
| 2003 | 0 | 5 | 4 | 0 | 13 | 0 | 3 | 44 | 9 | 4 | 5 | 1 | 0 | 0 | 0 | 7 | 1 |
| 2004 | 0 | 8 | 6 | 0 | 16 | 0 | 5 | 47 | 15 | 5 | 5 | 1 | 0 | 0 | 0 | 9 | 2 |
| 2005 | 0 | 11 | 7 | 0 | 15 | 0 | 4 | 49 | 18 | 5 | 6 | 1 | 0 | 0 | 0 | 9 | 3 |
| 2006 | 1 | 11 | 7 | 0 | 15 | 0 | 4 | 40 | 20 | 5 | 6 | 1 | 0 | 0 | 0 | 8 | 3 |
| 2007 | 1 | 12 | 3 | 0 | 16 | 0 | 4 | 40 | 22 | 6 | 9 | 2 | 0 | 0 | 0 | 7 | 3 |
| 2008 | 1 | 15 | 2 | 1 | 16 | 0 | 4 | 40 | 22 | 6 | 14 | 1 | 0 | 0 | 1 | 9 | 5 |
| 2009 | 1 | 19 | 2 | 1 | 14 | 0 | 4 | 38 | 27 | 5 | 12 | 4 | 0 | 0 | 1 | 10 | 4 |
| 2010 | 1 | 18 | 2 | 1 | 14 | 0 | 4 | 42 | 25 | 5 | 13 | 4 | 0 | 0 | 1 | 10 | 4 |
| 2011 | 3 | 22 | 2 | 1 | 14 | 0 | 3 | 30 | 22 | 5 | 14 | 4 | 0 | 0 | 1 | 20 | 5 |
| 2012 | 3 | 23 | 2 | 1 | 15 | 0 | 4 | 29 | 24 | 5 | 14 | 4 | 1 | 0 | 2 | 19 | 5 |
| 2013 | 3 | 27 | 1 | 1 | 15 | 0 | 4 | 30 | 25 | 5 | 14 | 4 | 1 | 1 | 3 | 24 | 5 |
| 2014 | 4 | 25 | 4 | 1 | 14 | 1 | 6 | 29 | 26 | 5 | 16 | 4 | 1 | 0 | 3 | 27 | 5 |
| 2015 | 3 | 30 | 4 | 5 | 15 | 1 | 6 | 30 | 27 | 4 | 14 | 4 | 1 | 0 | 2 | 31 | 5 |
| 2016 | 3 | 31 | 4 | 5 | 23 | 0 | 6 | 30 | 28 | 3 | 13 | 4 | 1 | 0 | 3 | 33 | 5 |
| 2017 | 3 | 35 | 4 | 7 | 34 | 0 | 5 | 36 | 36 | 5 | 18 | 4 | 1 | 2 | 4 | 36 | 5 |
| 2018 | 2 | 39 | 4 | 6 | 29 | 0 | 5 | 44 | 39 | 6 | 17 | 3 | 1 | 4 | 4 | 43 | 4 |
| 2019 | 2 | 41 | 4 | 6 | 38 | 0 | 5 | 47 | 38 | 6 | 16 | 3 | 1 | 5 | 4 | 45 | 4 |
| 2020 | 2 | 45 | 4 | 4 | 27 | 0 | 6 | 43 | 32 | 6 | 15 | 3 | 1 | 4 | 4 | 43 | 4 |
| 2021 | 3 | 51 | 5 | 3 | 27 | 0 | 6 | 41 | 31 | 7 | 14 | 2 | 1 | 5 | 2 | 43 | 4 |
| 2022 | 2 | 39 | 5 | 3 | 24 | 0 | 5 | 41 | 28 | 6 | 14 | 2 | 1 | 4 | 2 | 50 | 4 |
| 2023 | 1 | 49 | 5 | 3 | 24 | 0 | 4 | 39 | 25 | 6 | 13 | 2 | 1 | 4 | 1 | 50 | 5 |
| 2024 | 2 | 48 | 1 | 4 | 23 | 0 | 3 | 36 | 30 | 7 | 9 | 2 | 0 | 5 | 2 | 45 | 5 |
| 2025 | 1 | 26 | 1 | 0 | 5 | 0 | 0 | 16 | 13 | 5 | 5 | 1 | 0 | 1 | 1 | 21 | 4 |
| 2026 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
