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| LaThuid: | US-UMB |
| Site Name: | Univ. of Mich. Biological Station |
| Network: | AmeriFlux |
| Sec. Network(s): | Unknown |
| Latitude: | 45.5598 |
| Longitude: | -84.7138 |
| Elevation(m): | 234 |
| IGBP: | DBF |
| Description | Schmid et al. 2003, JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 108, NO. D14, 4417, doi:10.1029/2002JD003011 |
| Site Citation: | |
| Site Acknowledgment: | |
| Data Usage Note: | TBA |
| Primary Contact: | Peter Curtis |
| Curator: | Tom Boden |
| Anc Curator: | Tom Boden |
| Years Of Data: | 5 (Duration: 1999 - 2003) |
| Tower Status: | Active (1999 - Present) |
| Site image(s): | Image |
| VE Cutouts: | Max Zoom :: Mid 1 Zoom :: Mid 2 Zoom :: Min Zoom |
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| Coordinator | Title | Collaborators | Topic |
| Rodrigo Vargas | A mycocentric perspective on environmental factors controlling CO2 fluxes from terrestrial ecosystems | Vargas; Baldocchi; Allen; Hasselquist | |
| May Myklebust | LAI influence on bias in night time eddy covariance data during windy conditions | Myklebust; Misson; Wohlfahrt | |
| Sonia Seneviratne | Multi-scale land-atmosphere interactions | Seneviratne; Reichstein; Ciais; Buchmann; Stockli | Biophysical feedbacks, Drought effects |
| Andrew Richardson | Exploring relationships among carbon exchange, foliar nitrogen, and canopy albedo at global scales | Richardson; Ollinger; Martin; Hollinger | |
| Timothy W. Hilton | What is the spatial and temporal coherence of flux tower signals | Hilton; Davis; Ciais; Desai | Up-scaling, regional, process-oriented |
| 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 |
| 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 |
| 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 |
| ShiLong Piao | Effect of snow change on the C balance in various northern ecosystems | Piao;Ciais;Reichstein;Luyssaert | Snow effects; Boreal-Tundra |
| 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 |
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| Instruments | Brand/model | Levels/depths | Type | Frequency | Comment | Reference |
| (Other) | | profile 3 levels | | | | Hank Loescher, February 2005 |
| RTD | | | | | Intercalibration Team |
| AG_BIOMASS_NWT | | | PTAQ (bracken fern) is the major (>95% by mass) of the non-woody species found at UMBS. Destructive harvest of PTAQ fronds was used to develop the relationship 'frond Dry Mass (g) = 0.0044*(l*w)+1.6353' where l = frond length (cm) and w = frond width (cm), R2=0.81. PTAQ biomass was estimated in the 1.13 ha plot surrounding the flux tower by measuring frond dimensions in 36 - 1 m2 plots. | | | |
| AG_BIOMASS_SF | | | Shrubs are an insignificant component of UMBS forest understory and were not measured. | | | |
| AG_BIOMASS_SW | | | Shrubs are an insignificant component of UMBS forest understory and were not measured. | | | |
| AG_BIOMASS_TF | | | Determined from autumnal leaf litter and green leaf SLA. Years 1997 - 2001, 61 plots. Years 2002 - 2003, 31 plots. Years 2004 - 2006, 51 plots. | | | |
| AG_BIOMASS_TT | | | | | | |
| AG_BIOMASS_TW | | | Woody Biomass = a*D^b where D = DBH (diam. at 1.37 m) and a and b are species specific coefficients. Multiply result by woody C concentration to obtain AG_BIOMASS_TW. Species specific coefficients for a*D^b are: ACRU a=0.03117, b=2.778; BEPA a=0.0301, b=2.8387; FAGR a=0.1892, b=2.3097; PIST a=0.0408, b=2.5735; POGR4 a=0.1387, b=2.3498; POTR a=0.0589, b=2.6235; QURU a=0.0398, b=2.7734. For years 1998 and 2001 all trees (>7700 trees) in 61 plots (1 - 1.13 ha plot + 60 - 0.08 ha plots) were directly measured for DBH. For years 1999, 2000, and 2002 DBH was estimated for all trees based on band dendrometers installed on ~ 40% of trees of DBH>= 10 cm in 31 plots. For year 2003, DBH was directly measured on an additional 20 - 0.08 ha plots and DBH estimated from band dendrometers in 31plots. For years 2004 - 2006, DBH estimated from band dendrometers installed on ~ 40% of trees of DBH>= 10 cm in 51 plots. | | | |
| AG_PROD_TF | | | see AG_BIOMASS_TF_METHOD | | | |
| AG_PROD_TW | | | Prior year AG_BIOMASS_TW subtracted from current year AG_BIOMASS_TW | | | |
| Anemometer | Campbell: CSAT3 | | 3-D, sonic | | | Hank Loescher, February 2005 |
| Barometer | Vaisala: PTB101B | | | | | Hank Loescher, February 2005 |
| CR_BIOMASS | | | Coarse root biomass determined initially in 1999 from soil cores (18 plots with 5 pooled 5 cm dia. soil cores per site). Initial 1999 CR biomass agreed closely with regression of above biomass density versus below ground biomass density found in Cairns et al, 1997, Oecologia, 111: 1-11. A linear regression was developed using the Cairns et al data along with UMBS data where below ground biomass density (kg/ha) = 0.2523*ABD+.6923, where ABD = above ground biomass density (kg/ha). | | | |
| CR_PROD | | | Prior year CR_BIOMASS subtracted from current year CR_BIOMASS | | | |
| FR_BIOMASS | | | See Gough et al., Agric Forest Meteorol. (2008), 148:158-170 | | | |
| FR_PROD | | | See Gough et al., Agric Forest Meteorol. (2008), 148:158-170 | | | |
| Gas Analyzer | LI-COR: LI-6262 | | CO2/H2O, infrared | | | Hank Loescher, February 2005 |
| NEP | | | See Gough et al., Agric Forest Meteorol. (2008), 148:158-170 | | | |
| Quantum sensor | LI-COR: Li-190SA | | | | | Intercalibration Team |
| Radiometer | Kipp & Zonen: CNR 1 | | net | | | Hank Loescher, February 2005 |
| REBS: Q*7.1 | | net | | | Hank Loescher, February 2005 |
| Rs_MEAN | | | LI_COR 6400 with 6400-09 soil chamber. Each reported value (see separate UMBS_Rs data files) is the mean of 5 - 24 individual measurements in 5 - 8 plots. | | | |
| SPP_O_PERC | | | Overstory trees defined as trees >=10cm DBH. Direct measurement of trees within a 60 m radius (1.13 ha plot) of flux tower and 60 - 0.08 ha plots within 1 km of flux tower. | | | |
| SPP_U_PERC | | | Understory trees defined as trees < 10cm DBH. Direct measurement of trees within a 60 m radius (1.13 ha plot) of flux tower and 60 - 0.08 ha plots within 1 km of flux tower. | | | |
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| Bibliography |
| Schmid, H. P.; Su, H.-B.; Vogel, C. S.; Curtis, P. S. 2003 Ecosystem-atmosphere exchange of carbon dioxide over a mixed hardwood forest in northern lower Michigan. J. Geophys. Res.Vol. 108, No. D14, 4417. 10.1029/2002JD003011 |
| P. S. Curtis, C. S. Vogel, C. M. Gough, H. P. Schmid, H.-B. Su, B. D. Bovard. 2005. Respiratory carbon losses and the carbon-use efficiency of a northern hardwood forest, 1999–2003. New Phytologist. Vol 167, 437-456. |
| Shelley Pressley; Brian Lamb; Hal Westberg; Christoph Vogel. 2006. Relationships among canopy scale energy fluxes and isoprene flux derived from long-term, seasonal eddy covariance measurements over a hardwood forestAgricultural and Forest Meteorology. 136:3-4, 188-202. |
| 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. |
| A. J. Jarvis; V. J. Stauch; K. Schulz; P. C. Young. 2004. The seasonal temperature dependency of photosynthesis and respiration in two deciduous forestsGlobal Change Biology. 10:6, 939-950. |
| 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. |
| P. S. Curtis; P. J. Hanson; P. Bolstad; C. Barford; J. C. Randolph; H. P. Schmid; K. B. Wilson. 2002. Biometric and eddy-covariance based estimates of annual carbon storage in five eastern North American deciduous forestsAgricultural and Forest Meteorology. 113:1-4, 3-19. |
| D. E. Rothstein; D. R. Zak; K. S. Pregitzer; P. S. Curtis. 2000. Kinetics of nitrogen uptake by Populus tremuloides in relation to atmospheric CO2 and soil nitrogen availabilityTree Physiology. 20:4, 265-270. |