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News 2005

December
Meetings

The Biomet Lab is well represented at the AGU meeting in San Francisco.

A. Knohl is leading a session on ' Stable Isotopes in Soil-Plant-Atmosphere Interactions '

J. Yuste-Curiel is leading a session on 'Recent Advances in Soil Ecology and Their Contribution to Understanding Soil Carbon Dynamics "

Talks and posters include:

Knohl, A, Baldocchi, DD. Canopy Carbon Discrimination in a Dense Forest Estimated From a Multi-Layer Biophysical Model

Ma, S., Baldocchi DD, Xu, L. Seasonality and Interannual Variability of Carbon Uptake and Respiration in a California Oak Savanna

Chen, X, Rubin, Y, Baldocchi, DD. Bayesian Inversion of Soil-Plant-Atmosphere Interactions for an Oak-Savanna Ecosystem Using Markov Chain Monte Carlo Method

Curiel-Yuste, J, Misson, L, Tang J, Goldstein, A, Baldocchi DD Spatial and temporal variability of soil microbial decomposition-derived CO2 efflux at two contrasting Mediterranean ecosystems

Miller, G, Baldocchi, DD An Investigation of Soil Moisture Dynamics Using FLUXNET Data

Falk, M, Baldocchi D, Mercado I, Ma, S Hehn T Linking the Seasonal Variation of Vegetation Indices to Tower Flux Measurements in an Oak-Savanna Ecosystem in California: Comparing the Performance of Ground Based Sensors to Remotely Sensed Products from MODIS, AVIRIS and IKONOS.

Misson, L, Baldocchi, D, Black, A, Dorsey J, Falk M Goldstein AH, Granier, A, Jarosz N, Law, BE Longdoz, B, Loustau D, McKay M, PawU K, Wilson KB: Micrometerology and Flux Partitioning Between Understorey and Overstorey of Forest Canopies: a A synthesis Based on FLUXNET Data

Publications

Fisher, J., Tu, K. Baldocchi, D.D. 2005. Global estimates of the land-atmosphere water flux: a fully-remote sensing driven, flux site-validated ecophysiological model of evapotranspiration. Remote Sensing of the Environment. submitted.

Chapin, F.S. III, Woodwell, G.M, Randerson, J.T., Lovett, G.M., Rastetter, E.B., Baldocchi, D.D., Clark, D.A., Harmon, M.E., Schimel, D.S., Valentini R., Wirth C., Aber J.D., Cole J.J., Goulden M.L., Harden J.W., Heimann M., Howarth R.W., Matson P.A., McGuire A.D., Melillo J.M., Mooney,H.A., Neff, J.C., Houghton R.A., Pace M.L., Ryan M.G., Running S.W., Sala O.E., Schlesinger W.H., Schulze E.-D.. 2005. Reconciling Carbon Cycle Concepts, Terminology, and Methodology. Ecosystems. in press

Research

The Los Gatos tunable diode laser spectrometer was delivered. We aim to deploy it on Sherman Island in the Delta this winter to measure methane fluxes. Lab tests are underway. James Dorsey is leading the effort.

Make II of the LED ndvi sensor was fabricated and deployed by Ted Hehn, with his assistance from Ilse Mercado. Matthias Falk is making efforts to calibrate it with the ocean optics spectrometer and compare reflectances with Make I. The new diffuse gives is a very good cosine response.

Efforts are underway to assess climate change effects on California agriculture for a Cal EPA to the Governator. Our analysis, with the student Simon Wong, is showing that winter chill is decreasing in the fruit growing region of California

October
Meetings

Falk, M. Ma, S, Heinsch, FA and Baldocchi, DD Linking the seasonal variation of vegetation indices to tower flux measurements: a look at an oak savanna ecosystem in California and the Fluxnet network. 1 st International symposium of 21 st century COE program, satellite ecology. Gifu Japan, Oct 2005 falk Japan

Meetings

Siyan Ma, Jorge Curiel-Yuste, Matthias Falk and ddb attended the AmeriFlux workshop in Boulder.

Visitors

Markus Reichstein and Dario Papale, from Universita di Tuscia, Viterbo, Italy visited the Biomet lab after the AmeriFlux meeting.

September
Publications

Alexander Knohl is a co-author on a paper published in Nature.

Ciais, P., Reichstein, M., Viovy, N. et al., 2005. Europe-wide reduction in primary productivity caused by the heat and drought in 2003. Nature.

DDB wrote a News and Views article for Nature on that paper.

Staff News

KT Paw U from UCDavis is spending part of his sabbatical in the Biomet Lab.

Submissions

Chapin, F.S. III, Woodwell, G.M, Randerson, J.T., Lovett, G.M., Rastetter, E.B., Baldocchi, D.D., Clark, D.A., Harmon, M.E., Schimel, D.S., Valentini R., Wirth C., Aber J.D., Cole J.J., Goulden M.L., Harden J.W., Heimann M., Howarth R.W., Matson P.A., McGuire A.D., Melillo J.M., Mooney,H.A., Neff, J.C., Houghton R.A., Pace M.L., Ryan M.G., Running S.W., Sala O.E., Schlesinger W.H., Schulze E.-D.. 2005. Reconciling Carbon Cycle Concepts, Terminology, and Methodology. Ecosystems. Submitted.

Baldocchi, D.D. and Xu, L. 2005. Evaporation from Mediterranean Oak Woodlands-a Balance between the Supply and Demand for Water by Plants and the Atmosphere. Advances in Water Research.

August
Staff News

Jessica Cruz married Luis Osuna and is now Jessica Cruz Osuna

July
Publications

Publications

Baldocchi, DD. T.A. Black, P. Curtis, E. Falge, J.D. Fuentes, A Granier, L. Gu, A Knohl, X. Lee, K Pilegaard, HP Schmid, R. Valentini, S. Wofsy, L. Xu 1 and S. Yamamoto. 2005. Predicting the Onset of Carbon Uptake by Deciduous Forests with Soil Temperature and Climate Data: A Synthesis of FLUXNET Data. International Journal of Biometeorology. 49, 377-387.

Tang, J., Baldocchi, DD, Xu, L.* 2005. Tree photosynthesis modulates soil respiration in a savanna ecosystem. Global Change Biology.11, 1298-1304

Sims, D.A., Rahman, A.F., Cordova, V.D. Baldocchi, DD, Fla nagan, L.B., Goldstein,A.H., Hollinger, D.Y, Misson, L., Monson, R.K. Schmid, H.P., Wofsy, S.C., Xu, L. 2005. Midday values of gross CO 2 flux and light use efficiency during satellite overpasses can be used to directly estimate eight-day mean flux. Agricultural and Forest Meteorology.131, 1-12.

Meyers TP, Baldocchi DD. 2005. Current micrometeorological flux methodologies with applications in agriculture. In: Micrometeorological Measurements in Agricultural Systems. Ed. JL Hatfield. American Agronomy Society. pp 381-396..

Reichstein, M., Falge, E., Baldocchi D.., Papale, D., Valentini, R., Aubinet, M. Berbigier, P., Bernhofer, C., Buchman, N., Gilmanov, T., Granier, A., Grunwald, T., Havrankova, K., Janous, D., Knohl, A., Laurela, T., Lohila, A., Loustau, D., Matteucci, G., Meyers, T., Miglietta, F., Ourcival, J., Rambal, S., Rotenberg, E., Sanz, M. Tenhunen, J., Seufert, G., Vaccari, F., Vesala, T., Yakir, D., Valentini, R., 2005. On the separation of net ecosystem exchange into assimilation and ecosystem respiration: review and improved algorithm, Global Change Biology (in press, on-line).

Staff News

Simon Wong joined the Biometeorology lab as an undergraduate assistant. Simon is helping Jorge measure carbon turnover with an incubation study and his helping ddb perform an agricultural climatology analysis on trends in winter chill units for California fruit growing zones.

Matthias Falk defended his dissertation in the Dept of Land, Air and Water Resources at the University of California, Davis. The title of his Dissertation was. “Carbon and energy exchange between an old-growth forest and the atmosphere”.

June
Meetings

Presentations were given on the oak savanna research at the WESTGEC meeting at UC Davis, attended by ddb and Matthias Falk.

Publications

Tang, J., Baldocchi, DD. 2005. Spatial-temporal Variation of Soil Respiration in an Oak-Grass Savanna Ecosystem in California and its Partitioning into Autotrophic and Heterotrophic Components. Biogeochemistry. 73, 183-207

BaldocchiI, D.D., Krebs, T. and Lecler, M.Y., 2005. "Wet/dry Daisyworld": a conceptual tool for quantifying the spatial scaling of heterogeneous landscapes and its impact on the subgrid variability of energy fluxes. Tellus B, 57(3): 175-188.

Tang, J., Baldocchi, DD, Xu, L. 2005. Tree photosynthesis modulates soil respiration in a savanna ecosystem. Global Change Biology. published online.

Sims, D.A., Rahman, A.F., Cordova, V.D., Baldocchi, DD., Flanagan, L.B., Goldstein,A.H., Hollinger, D.Y, Misson, L., Monson, R.K. Schmid, H.P., Wofsy, S.C., Xu, L. 2005. Midday values of gross CO 2 flux and light use efficiency during satellite overpasses can be used to directly estimate eight-day mean flux. Agricultural and Forest Meteorology. published online.

Baldocchi, D.D., Tang, J. Xu, L. 2005. How Switches and Lags in Biophysical Regulators Affect Spatio-Temporal Variation of Soil Respiration in an Oak-Grass Savanna. Journal of Geophysical Research, Biogeosciences. Submitted

Visitors

Jose Fuentes, from the University of Virginia, is in residence for two months working on carbon, water and energy exchange studies and coupled surface-PBL modelling.

May
Meetings

Jessica Cruz and ddb attended the workshop on Biosphere-Atmosphere Research Training at the University of Michigan Biological Station, Pellston, MI. Jessica has a BART fellowship and is conducting research there this summer on photosynthesis of oak leaves. Jessica gave a presentation on here research plans.

ddb attended the rd CNR ( Italy)- Princeton Workshop on New Frontiers in Hydrology. Princeton, NJ. May 18, 2005 and gave a presentation on.' An Italo-Californian Perspective on Ecohydrology'.

Jorge Curiel-Yuste attended the Kearney Soil Science workshop at UC Davis.

The Biometeorology Group at UC Davis, under the direction of Prof. K.T. Paw U visited on May 6 for a UC Biometeorology exchange day. Students and postdocs in the groups gave summaries of their current research. This continues our periodic group meetings among the two UC groups.

Publications

Prabda, T, Leclerc, M.Y. Baldocchi, D.D. 2005. Comparison of in-canopy flux footprints from Lagrangian Simulations against wind tunnel experiments and Large-Eddy Simulation. Journal of Geophysical Research. submitted.

April
Meetings

DDB gave a Seminar at the Deptartment of Ecology, Evolution and Natural Resources, Rutgers University on 'The dynamics of biosphere-atmosphere exchange: the roles of pulses, switches and lags' , April 7. The host was Ming Xu, a former ESPM student. Among the highlights of the trip were a visit to the pine barrens field site, where 4 new, soon to be registered, AmeriFlux sites are in operation, a visit to the pigmy forests, inspection of Mings new and innovative automated soil respiration system and discussions with Dan Murnick about an opto-galvanic system for measuring 13C.

On April 19, DDB gave a seminar at the Department of Land, Air and Water Resources at UC Davis on FLUXNET after 10 Years: Synthesizing CO 2 and Water Vapor Fluxes From Across a Global Network.

Alex Knohl attended the European Geophysical Society meeting in Vienna and represented FLUXNET at the ILEAPS meeting.

Qi Chen attended the annual meeting of American Association of Geographers and gave a presentation on isolating trees with LIDAR. He won the 1st place in the Student Honors Paper Competition of the remote sensing specialty group. Congratulations.

Publications

Baldocchi D.D., Liukang Xu. 2005. Carbon Exchange of Deciduous Broadleaved Forests in Temperate and Mediterranean Regions. In: Carbon Balance of Forest Biomes. Eds. PJ Jarvis and H Griffiths. BIOS Scientific Publishers Ltd. Pp 187-215.

Wang, Y.P., Baldocchi, D., Leuning, R., Falge, E. and V esala, T. 2005. Estimating parameters in a land surface model by applying nonlinear inversion to eddy covariance flux measurements from eight FLUXNET sites. Global Change Biology. Submitted.

Falk, M., Baldocchi, D., Meyers, T., Black, T.A., Barr, A., Yamamoto, S., Verma, S., Heinsch, F.A., Rebmann, C., Knohl, A, Richardson, A.D., Braswell, R., Paw U, K.T., Schroeder, M., Burba, G.,Suyker, A. 2005. On Assessing Seasonal Dynamics of MODIS Vegetation Indices: Comparing High Temporal Resolution Broadband NDVI from a Global Network with Satellite Derived Products. Remote Sensing of the Environment. Submitted.

Castellvi, F., Synder, R., Baldocchi, D.D., A Comparison of New and Existing Equations for Estimating Sensible Heat Flux Density using Surface Renewal and Similarity Concepts. Agricultural and Forest Meteorology . Submitted.

Staff News

Jessica Cruz was awarded an NSF Graduate Fellowship. Congratulations.

March
Meetings

DDB participated in NSF summit on Integrated Earth Systems Science. March, 4, 2005

February
Meetings

DDB gave a presentation on Water and Savanna Rangelands: Today and Tomorrow. Rangeland Water Quality Conference. Woodland, Ca. Feb 23-24, 2005.

Other

Several of us traveled to Los Gatos Research to inspect the new laser spectroscopy methane sensor.

January
Meetings

DDB attended the CARBOEUROPE Integrated Project meeting in Dublin, Ireland, Jan 10-15, as a member of the external advisory committee and a representative of Fluxnet.

Publications

Baldocchi, DD. 2005. The role of biodiversity on the evaporation of forests. In: Forest Diversity and Function: Temperate and Boreal Systems. Ecological Studies, vol 176. Eds. Michael Scherer-Lorenzen and E. Detlef Schulze.Springer-Verlag, Berlin. Pp. 131-148.

Baldocchi, DD. Bowling, DR. 2005. Theoretical Examination of Keeling-plot Relationships for Carbon Dioxide in a Temperate Broadleaved Forest with a Biophysical Model, CANISOTOPE. In: Stable Isotopes and Biosphere-Atmosphere Interactions. Ed L Flanagan, J.R. Ehleringer, D. Pataki. Academic Press. Pp 109-124.

The Daisyworld Paper submitted to Tellus was accepted for publications and we received page proofs for the Fluxnet phenology paper that was submitted to International Journal of Biometeorology.

Staff News

James Dorsey joined the Biometeorology lab from Manchester Institute of Techology. James will work on footprint modeling and start a new field program to measure methane fluxes with a laser spectrospy system.

         
    This material is based upon work supported by the National Science Foundation and US Department of Energy. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the supporters.