|
| LaThuid: | US-Ho1 |
| Site Name: | Howland Forest (main tower) |
| Network: | AmeriFlux |
| Sec. Network(s): | Unknown |
| Latitude: | 45.2041 |
| Longitude: | -68.7402 |
| Elevation(m): | 60 |
| IGBP: | ENF |
| Description | Closed conifer forest, minimal disturbance. References: Fernandez et al. (1993), Canadian Journal of Soil Science 73 317-328. Hollinger et al. (1999), Global Change Biology 5: 891-902. Savage KE, Davidson EA (2001), Global Biogeochemical Cycles 15 337-350. Scott et al. (2004), Environmental Management, Vol. 33, Supplement 1, pp. S9-S22. Hollinger et al. (2004), Global Change Biology 10: 1689-1706. |
| Site Citation: | |
| Site Acknowledgment: | |
| Data Usage Note: | TBA |
| Primary Contact: | Dave Hollinger |
| Curator: | Tom Boden |
| Anc Curator: | Tom Boden |
| Years Of Data: | 9 (Duration: 1996 - 2004) |
| Tower Status: | Active (1996 - Present) |
| Site image(s): | Image |
| VE Cutouts: | Max Zoom :: Mid 1 Zoom :: Mid 2 Zoom :: Min Zoom |
|
| Coordinator | Title | Collaborators | Topic |
| Guillaume Drolet | Understanding the Environmental Controls on Net and Gross Light-Use Efficiency and Their Temporal Patterns - A Circumboreal Study | Drolet;Margolis;Middleton | Radiation effects, Boreal |
| Andrew Richardson | Exploring relationships among carbon exchange, foliar nitrogen, and canopy albedo at global scales | Richardson; Ollinger; Martin; Hollinger | |
| Sonia Seneviratne | Multi-scale land-atmosphere interactions | Seneviratne; Reichstein; Ciais; Buchmann; Stockli | Biophysical feedbacks, Drought effects |
| Sebastiaan Luyssaert | Short term extremes in NEE: drivers and responses in natural ecosystems | Luyssaert; Hollinger; Munger; Stoy; Archibald; Buchmann; Williams; Janssens | Temporal variability; extremes |
| Timothy W. Hilton | What is the spatial and temporal coherence of flux tower signals | Hilton; Davis; Ciais; Desai | Up-scaling, regional, process-oriented |
| Alan Barr | Synthesis of Inter-Annual Variability in Net Ecosystem Exchange at Long-Term North American Mature Boreal and North-Temperate Forest Flux-Tower Sites | Barr;Black;Wofsy;Hollinger; | IAV, Boreal |
| Christian Beer | Which environmental factors determine temporal and spatial variability of water-use efficiency on ecosystem level | Beer; Baldocchi; Bernhofer; Buchmann; Ciais; Knohl; Koestner; Kutsch; Reichstein; Soussana; Williams | C-H2O |
| Hank A. Margolis | Contrasting the Seasonal Patterns of Fluxes and Environmental Responses Functions for the Circumboreal Forest | Margolis;Drolet | Boreal forest |
| Christopher A. Williams | Carbon Dioxide and Water Flux Responses to Extreme Weather and Climate Anomalies | Williams; Munger; Hollinger; Stoy; Richardson; Schaefer; Stockli; Schwalm | Temporal variability; extremes |
| Christian Bernhofer | Analyzing long-term FLUXNET measurements for reliable ET values across ecosystems types and across climatic regions | Bernhofer; Koestner; Knohl; Lindroth; Grünwald; Riedel | H2O |
| Andrew Richardson | Effect of spring onset and autumn senescence date on forest-atmosphere CO2 exchange | Richardson;Piao;Ciais;Breon | Phenology; growing season |
| Enrico Tomelleri | Calibration of a light use efficiency model using FLUXNET data | Tomelleri;Reichstein;Papale;Gorner | Up-scaling, global, data-oriented |
| Gitta Lasslop | Extended hyperbolic light response curve including VPD effects to derive GPP estimates mainly based on daytime data | Lasslop; Reichstein; Papale | |
| Chuixiang Yi | Climate control of terrestrial carbon sequestration | Yi; Ricciuto; Monson | |
| Andrew Jarvis | A data-based cross-site evaluation of (optimal) carbon gain and water use strategies as expressed in FLUXNET eddy covariance data | Jarvis;Stauch | C-H2O |
| Darrel Jenerette | Variation of ecosystem metabolic rain response along a 2000 mm rainfall gradient | Jenerette;Scott;Huxman | Drought effects; C |
| Mirco Migliavacca | Semi-empirical modelling of ecosystem respiration: review, improved algorithm and integration with Earth observation data | Migliavacca; Reichstein; Richardson; Lasslop | Ecosytem respiration; spatio-temporal |
| ShiLong Piao | Effect of snow change on the C balance in various northern ecosystems | Piao;Ciais;Reichstein;Luyssaert | Snow effects; Boreal-Tundra |
| Miguel D. Mahecha | Time scale dependent parameter estimation: principle and example elaboration in an model-eddy covariance data fusion experiment | Mahecha; Reichstein; Carvalhais; Lasslop; Lange; Seneviratne | |
| Christian Beer | Upscaling mean annual GPP from ecosystem level to the global land surface | Beer; Tomelleri; Reichstein; Carvalhais; Jung; Papale; Peylin; Ciais | |
| Philippe Ciais | What the eddy-covariance flux measurements tell us about prior errors in CO2-flux inversion schemes | Chevallier; Ciais; Maignan; Wang; Reichstein | |
| Martin Jung | Identifying environmental and biophysical controls of monthly carbon and water fluxes | Jung; Reichstein; Papale; Tomelleri | |
| Enrico Tomelleri | Climatic effects on the inter‐annual variability of net ecosystem fluxes of North America and Europe | Tomelleri; Migliavacca; Carvalhais | |
| Dario Papale | A new global spatialized estimate of NEP, GPP and TER and analysis of uncertainty and limiting factors using data driven models and eddy covariance measurements | Papale, Reichstein, Tomelleri | Up-scaling, global, data-oriented |
|
| Instruments | Brand/model | Levels/depths | Type | Frequency | Comment | Reference |
| (Other) | | | | | web page also says at depths 3.8, 7.6, 16, 22, 32, and 62 cm | Ameriflux web page |
| AG_BIOMASS_TF | | | Hollinger et al. 2004 | | | |
| AG_BIOMASS_TT | | | Hollinger et al. 2004 | | | |
| AG_BIOMASS_TW | | | Hollinger et al. 2004 | | | |
| Anemometer | ATI: K-probe upgrade | | 3-D, sonic | | | Hank Loescher, February 2005 |
| Gas Analyzer | LI-COR: LI-6251 | 8.5, 13.5, 19.5, and 26.5 m | CO2, infrared | | | Ameriflux web page |
| LI-COR: LI-6262 | | CO2/H2O, infrared | | | Global Change Biology, 2006, 12, 230-239 |
| Quantum sensor | LI-COR: Li-190SA | | | | | Hank Loescher, February 2005 |
| Radiometer | REBS: Q*7.1 | | net | | | Hank Loescher, February 2005 |
| Rs_MEAN | | | Savage & Davidson, 2001 | | | |
| RT_BIOMASS | | | Quantitative soil pit, see Fernandez et al. 1993 | | | |
| Soil heat flux plates | REBS: HFT3 | | | | | Hollinger (document file) |
| Soil moisture probe | Hydra-Vitel | 5, 10, 20, 50, 100 cm | | | | Global Change Biology, 2006, 12, 230-239 |
| SPP_O_PERC | | | FIA Inventory plots at 30 degree radii around tower with subplots located at 50, 100, 200, and 400 m distant from tower | | | |
| Thermocouple | | | | | | Hank Loescher, February 2005 |
| Thermometer | Omega: RTD-810 | 26.5 m | Platinum resistance | | | Global Change Biology, 2006, 12, 230-239 |
|
| Bibliography |
| Fernandez et al. 1993. Estimating total soil mass, nutrient content, and trace metals in soils under a low elevation spruce-fir forest. Canadian Journal of Soil Science, 73, 317-328 |
| Hollinger et al. 1999. Seasonal patterns and environmental control of carbon dioxide and water vapor exchange in an ecotonal boreal forest. Global Change Biology, 5:891-902. |
| Hollinger et al. 2004. Spatial and temporal variability in forest-atmosphere CO2 exchange. Global Change Biology, 10:1689-1706. |
| E. A. Davidson; A. D. Richardson; K. E. Savage; D. Y. Hollinger. 2006. A distinct seasonal pattern of the ratio of soil respiration to total ecosystem respiration in a spruce-dominated forestGlobal Change Biology. 12:2, 230-239. |
| A. D. Richardson; D. Y. Hollinger; G. G. Burba; K. J. Davis; L. B. Flanagan; G. G. Katul; J. W. Munger; D. M. Ricciuto; P. C. Stoy; A. E. Suyker; S. B. Verma; S. C. Wofsy. 2006. A multi-site analysis of random error in tower-based measurements of carbon and energy fluxesAgricultural and Forest Meteorology. 136:1-2, 1-18. |
| Eric A. Davidson; Ivan A. Janssens; Yiqi Luo. 2006. On the variability of respiration in terrestrial ecosystems: moving beyond Q10Global Change Biology. 12:2, 154-164. |
| K. A. Hibbard; B. E. Law; M. Reichstein; J. Sulzman. 2005. An analysis of soil respiration across northern hemisphere temperate ecosystemsBiogeochemistry. 73:1, 29-70. |
| Daniel A. Sims; Abdullah F. Rahman; Vicente D. Cordova; Dennis D. Baldocchi; Lawrence B. Flanagan; Allen H. Goldstein; David Y. Hollinger; Laurent Misson; Russell K. Monson; Hans P. Schmid. 2005. Midday values of gross CO2 flux and light use efficiency during satellite overpasses can be used to directly estimate eight-day mean fluxAgricultural and Forest Meteorology. 131:1-2, 1-12. |
| X. M. Xiao; Q. Y. Zhang; D. Hollinger; J. Aber; B. Moore. 2005. Modeling gross primary production of an evergreen needleaf forest using modis and climate dataEcological Applications. 15:3, 954-969. |
| A. A. Arain; N. Restrepo-Coupe. 2005. Net ecosystem production in a temperate pine plantation in southeastern CanadaAgricultural and Forest Meteorology. 128:3-4, 223-241. |
| Andrew D. Richardson; David Y. Hollinger. 2005. Statistical modeling of ecosystem respiration using eddy covariance data: Maximum likelihood parameter estimation, and Monte Carlo simulation of model and parameter uncertainty, applied to three simple modelsAgricultural and Forest Meteorology. 131:3-4, 191-208. |
| C. T. Lai; J. R. Ehleringer; P. Tans; S. C. Wofsy; S. P. Urbanski; D. Y. Hollinger. 2004. Estimating photosynthetic C-13 discrimination in terrestrial CO2 exchange from canopy to regional scalesGlobal Biogeochemical Cycles. 18:1. |
| X. M. Xiao; D. Hollinger; J . Aber; M. Goltz; E. A. Davidson; Q. Y. Zhang; B. Moore. 2004. Satellite-based modeling of gross primary production in an evergreen needleleaf forestRemote Sensing of Environment. 89:4, 519-534. |
| E. A. Davidson; K. Savage; P. Bolstad; D. A. Clark; P. S. Curtis; D. S. Ellsworth; P. J. Hanson; B. E. Law; Y. Luo; K. S. Pregitzer; J. C. Randolph; D. Zak. 2002. Belowground carbon allocation in forests estimated from litterfall and IRGA-based soil respiration measurementsAgricultural and Forest Meteorology. 113:1-4, 39-51. |
| E. A. Davidson; K. Savage; L. V. Verchot; R. Navarro. 2002. Minimizing artifacts and biases in chamber-based measurements of soil respirationAgricultural and Forest Meteorology. 113:1-4, 21-37. |
| P. E. Thornton B. E. Law; H. L. Gholz; K. L. Clark; E. Falge; D. S. Ellsworth; A. H. Golstein; R. K. Monson; D. Hollinger; M. Falk; J. Chen; J. P. Sparks. 2002. Modeling and measuring the effects of disturbance history and climate on carbon and water budgets in evergreen needleleaf forestsAgricultural and Forest Meteorology. 113:1-4, 185-222. |
| E. Falge; D. Baldocchi; J. Tenhunen; M. Aubinet; P. Bakwin; P. Berbigier; C. Bernhofer; G. Burba; R. Clement; K. J. Davis; J. A. Elbers; A. H. Goldstein; A. Grelle; A. Granier; J. Guomundsson; D. Hollinger; A. S. Kowalski; G. Katul; B. E. Law; Y. Malhi; T. Meyers; R. K. Monson; J. W. Munger; W. Oechel; K. T. Paw; K. Pilegaard; U. Rannik; C. Rebmann; A. Suyker; R. Valentini; K. Wilson; S. Wofsy. 2002. Seasonality of ecosystem respiration and gross primary production as derived from FLUXNET measurementsAgricultural and Forest Meteorology. 113:1-4, 53-74. |
| K. E. Savage; E. A. Davidson. 2001. Interannual variation of soil respiration in two New England forestsGlobal Biogeochemical Cycles. 15:2, 337-350. |