News 2002
December
Staff News
Nancy Kiang is gave a Dept seminar on Dec 11 on her dissertation
research and submitted her Ph.D. dissertation on Dec 19. It is titled:
"Savannas and seasonal drought: The landscape-leaf connection through
optimal stomatal control". Nancy is the first Ph.D. student to graduate
from the Biometeorology lab.
Tess Krebs joins the Biomet Lab as a first year PhD student after
receiving her MS from Colorado State University (Scott Denning's
Group).
Alexander Knohl was in residence for two weeks. Alexander is a
graduate student at Max Planck Institute of Biogeochemistry, Jena
Germany. He is working on isotope measurements and is interested
in using CANOAK to interpret his field data at the Heinish field
site.
Meetings
The Fall AGU was held in San Francisco, Dec 6-10. We co-convened
a session on "Water, Energy, and Carbon Exchange in Forest Systems
" with Bev Law and Peter Thorton. Abstracts submitted by the Biomet
group include:
Gu, L Post, M Baldocchi, D Radiative effects of volcanic aerosols
and clouds on terrestrial photosynthesis
Xu, L Baldocchi, D Seasonal Variations in Carbon, Water and Energy
Fluxes in an Oak/Grass Savanna and in Photosynthetic Capacity of
Oak Leaf in California
Markus Reichstein, Dennis Baldocchi, Steve Running, John Tenhunen,
Riccardo Valentini, Serge Rambal, Jean-Marc Ourcival, André Granier,
Olivier Bouriaud, Thomas Grünewald, Chistian Bernhofer).Validation
Effort of MODIS LAI/GPP/NPP Products at FLUXNET Sites.
Papers
Wilson KB, Baldocchi DD, Aubinet M, Berbigier P, Bernhofer Ch,
Dolman H, Falge E, Field C, Goldstein H, Granier A, Grelle A, Halldor
T., Hollinger D, Katul G, Law BE, Lindroth A, Meyers T, Moncrieff
J, Monson R, Oechel W, Tenhunen J, Valentini R, Verma S, Vesala
T, Wofsy S. 2002. Surface energy partitioning between latent and
sensible heat flux at FLUXNET sites. Water Resources Research vol
38. doi: 10.1029/2001 WR 000989.
The paper by Gu et al on "Response of a deciduous forest to the
Mt Pinatubo eruption: enhanced photosynthesis" was conditionally
accepted by Science .
Tang J, Baldocchi D D., Qi Y, Xu L. 2003. Assessing soil CO2 efflux
using continuous measurements of CO2 within the soil profile with
small solid-state sensors. Agricultural and Forest Meteorology (submitted,
Dec. 2002).
Funding
We received notice of funding of the project "Soil respiration
and carbon sequestration of an oak-grass savanna in California:
roles of temperature, soil moisture, rain events and photosynthesis"
by the Kearney Foundation of Soil Science. Jan. 2003- Dec 2004.
November
Staff News
Matthias Falk joined the Biomet Lab as the new Fluxnet Postdoc.
He'll work parttime until the new year. He is finishing his PhD
at UC Davis with KT Paw U.
October
New Submissions
Xu L, Baldocchi DD. 2002. Seasonal trend of photosynthetic parameters
and stomatal conductance of blue oak (Quercus douglasii) under prolonged
summer drought and high temperature Tree Physiology (submitted,
Oct 18, 2002).
Meyers TP, Baldocchi DD. 2002. Current micrometeorological flux
methodologies with applications in agriculture. In: Micrometeorological
Measurements in Agricultural Systems. Ed. JL Hatfield. American
Agronomy Society
Williams M, Woodward FI, Baldocchi DD, Ellsworth D. 2002. CO2 capture
from the leaf to the landscape. In: "Evaluating Photosynthetic Adaptation
from the Chloroplast to the Landscape". Ed. W. Smith. Academic Press.
New publications.
The special issue of Agricultural and Forest Meteorology (December,
2002, volume) on the Fluxnet 2000 Synthesis workshop was published.
Papers with members of the Biomet lab as co-authors include:
Falge, E., Baldocchi, D., Tenhunen, J., Aubinet, M., Bakwin, P.,
Berbigier, P., Bernhofer, Ch., Burba, G., Clement, R., Davis, K.J.,
Elbers, J.A., Goldstein, A.H., Grelle, A, Granier, A, Guðmundsson,
J., Hollinger, D., Kowalski, A, Katul,G., Law,B, Malhi,Y., Meyers,T.,
Monson,R., Munger,JW, Oechel,W., Paw U,KT., Pilegaard,K, Rannik,U,
Rebmann, C, Suyker,A, Valentini, R., Wilson,K, and Wofsy, S. 2002.
Seasonality of ecosystem respiration and gross primary production
as derived from FLUXNET measurements. Agricultural and Forest Meteorology.
113, 53-74.
Wilson, K.B., Goldstein, A.H., Falge, E., Aubinet, M., Baldocchi,
D., Berbigier, P., Bernhofer, Ch., Ceulemans, R., Dolman, H., Field,
C., Grelle, A., Law,B., Meyers,T., Moncrieff, J., Monson, R., Oechel,W.,
Tenhunen, J., Valentini, R. and Verma, S. 2002. Energy balance closure
at FLUXNET sites. Agricultural and Forest Meteorology. 113, 223-243.
Law, B.E., Falge, E., Gu, L., Baldocchi, D., Bakwin, P., Berbigier,
P., Davis, K.J., Dolman, H., Falk, M., Fuentes, J., Goldstein, A.H.,
Granier, A, Grelle, A., Hollinger, D., Janssens, I., Jarvis, P.,
Jensen, N.O. Katul,G., Malhi,Y., Matteucci, G., Monson,R., Munger,
JW, Oechel,W., Olson, R., Pilegaard, K, Paw U, KT, Thorgeirsson,
H, Valentini, R., Verma, S. Vesala, T., Wilson,K, and Wofsy,S. 2002.
Environmental controls over carbon dioxide and water vapor exchange
of terrestrial vegetation. Agricultural and Forest Meteorology.
113, 97-120.
Falge, E., Tenhunen, J., Baldocchi, D. Aubinet, M., Bakwin, P.,
Berbigier, P., Bernhofer, Ch., Bonnefond, J-M, Burba, G., Clement,
R., Davis, K.J., Elbers, J.A., Falk, M., Goldstein, A.H., Grelle,
A, Granier, A, Grünwald, T, Guðmundsson, J., Hollinger, D., Janssens,
I., Keronen,P., Kowalski,A, Katul,G., Law,B, Malhi,Y., Meyers,T.,
Monson,R., Moors,E., Munger,JW, Oechel,W., Paw U,KT., Pilegaard,K,
Rannik,U, Rebmann,R, Suyker,A, Thorgeirsson,H, Tirone,G, Turnipseed,A,
Wilson,K, and Wofsy,S. 2002. Phase and amplitude of ecosystem carbon
release and uptake potential as derived from FLUXNET measurements.
Agricultural and Forest Meteorology.113, 75-95.
Tree Physiology paper that was produced for the Oregon IUFRO meeting
last summer is out
Baldocchi, DD, Wilson KB, Gu L. 2002. Influences of structural
and functional complexity on carbon, water and energy fluxes of
temperate broadleaved deciduous forest. Tree Physiology. 22 1065-1077
Meetings
DDB and Liukang Xu attend the AmeriFlux meeting at Boulder. DDB
gave an overview on the Fluxnet project and Xu gave a presentation
on the Oak Savanna research project.Oct 22.
The new lab renovation in 105 Hilgard is done. We now have a conference
table for meetings and 4 new workspaces for students and postdocs.
The lab downstairs is undergoing major renovation for future students
and visitors. Sno Anatoros has joined the lab as a volunteer.
Sno is a UC grad and is interested in biometeorology. He is working
on various calibration projects.
Proposals
A collaborative proposal was written with Yoram Rubin and Susan
Hubbard to study and model water exchange of savanna and vineyards
using eddy covariance, ground penetrating radar and ecohydrology
models and submitted to USDA. Its title is:
"Assessing Water Balance of Irrigated and Semi-Arid Ecosystems
at Multiple Scales Using Ground Penetrating Radar, Eddy Covariance
Measurements and an Ecohydrological Model"
September
New Submission:
Gu L, Baldocchi DD, Wofsy SC, Munger JW, Michalsky JJ, Boden TA.
2002. Response of a deciduous forest to the Mt Pinatubo eruption:
enhanced photosynthesis. Science. (submitted, Sept 9, 2002).
Baldocchi, DD. 2002. The role of biodiversity on the evaporation
of forests. In: The Functional Significance of Forest Diversity.
Eds. Michael Scherer-Lorenzen and E. Detlef Schulze. (submitted
Sept 17, 2002).
Meetings and Seminars
Liukang Xu attended the Chapman Conference on Eco-hydrology of
Semiarid Landscapes: Interactions and Processes, Taos, New Mexico.
9-13 September 2002 and presented a poster. Xu L, and Baldocchi
DD. Comparative Study of Energy Flux and Evapotranspiration of Oak/grass
Savanna and Grazed Grassland Under Extreme Soil Water Deficit and
High Temperature.
Sept. 6, 2002. Seminar. Measuring and Modeling Water & Energy
Exchange of Ecosystems: Case Studies on an Oak Savanna, a Grazed
Grassland and a Global Network of Field Sites, FLUXNET. Civil and
Environmental Engineering Seminar Series. University of California,
Berkeley.
Visitors
The Fluxnet Office has been humming with visitors. Joon Kim arrived
mid August to spend his sabbatical year with us. Riccardo Valentini
and Dario Parpale were in residence from mid August to mid September
testing new neural network theories as methods to fill data gaps
and to produce spatial maps of fluxes.
Markus Reichstein visited on August 30 and showed progress comparing
Modis estimates of NPP with Fluxnet fluxes.
Rob Clement was in resident the first week of September, working
on compiling raw turbulence data sets to assess the role of low
frequency contributions on fluxes.
Proposals
A proposal was submitted to NIGEC and the Kearney Foundation to
continue Oak Savanna Research
Baldocchi DD. PI. Roles of temperature, soil moisture, rain events
and plant functional type on carbon exchange of oak-grass savanna
ecosystems at two AmeriFlux sites in California. National Institute
For Global Environmental Change.
Baldocchi DD. Soil respiration and carbon sequestration of an oak-grass
savanna in California: roles of temperature, soil moisture, rain
events and photosynthesis. Kearney Foundation of Soil Science
August
ddb and Joon Kim attended the AmeriFlux meeting in Corvalis. August
27
July
Staff
July 1. Lianhong Gu resigned from the position of Fluxnet project
scientist to take a permanent position at Oak Ridge National Laboratory.
We are still searching for an able and qualified replacement for
Dr. Gu.
June.
Meetings
DDB and Riccardo Valentini co-convened the FLUXNET 2002 Synthesis
Workshop, Orvieto, Italy,June 20-22, 2002.
DDB presented a talk entitled: Partitioning Carbon and Water Fluxes
with Understorey Eddy Covariance Flux Measurements. Lianhong Gu
will lead a discussion section on Interannual Variability of Fluxes.
A report on the meeting is available through the Fluxnet web site
DDB attended LINKECOL Workshop on The Fucntional Significance of
Forest Diversity. June 13-15, 2002, Weimar, Germany and spoke on:
"Functional Significance of Diversity: Latent and Sensible Heat
Exchange".
May
Meetings
May 25. Liukang Xu, Lianhong Gu and DDB attended the 25th Conference
on Agricultural and Forest Meteorology in Norfolk, VA. The following
papers were presented.
Gu, L, Baldocchi, D.D., Verma, S.B., Black, T.A. Vesala, T. Impacts
of clouds on GPP and ecosystem respiration of contrasting terrestrial
ecosystems. Extended Abstract, 25th Conference on Agricultural and
Forest Meteorology. May, 2002. Norfolk, VA
Baldocchi, D.D., Xu, L. Kiang, N. Overstorey and understorey carbon
dioxide exchange of an oak savanna and grazed grassland exposed
to extreme soil water deficits and temperature. Extended Abstract,
25th Conference on Agricultural and Forest Meteorology. May, 2002.
Norfolk, VA.
Xu, L, Baldocchi, D.D. Kiang, N. 2002. Comparative study of overstory
and understory energy and water vapor fluxes of oak savanna and
grazed grassland under extreme soil water deficit and high temperature.
Extended Abstract, 25th Conference on Agricultural and Forest Meteorology.
May, 2002. Norfolk, VA.
Anthoni, PM, Unsworth, M., Law, BE, Irvine, J, Baldocchi, DD, Kolle,
O, Knohl, A, Schulze, ED. Comparison of open-path and closed path
eddy covariance system. Extended Abstract, 25th Conference on Agricultural
and Forest Meteorology. May, 2002. Norfolk, VA
Prabha, TV, Leclerc, MY, Baldocchi D Comparison of footprints inside
a canopy between large eddy simulation and Lagrangian models.. Extended
Abstract, 25th Conference on Agricultural and Forest Meteorology.
May, 2002. Norfolk, VA
Morgenstern, K, Baldocchi D., Barr A, Billsbach, D., Black, TA,
Davis, KJ, Falk M, Fischer M, Goldstein A, Ibrom A, Katul G, McCaughey
H, Paw U KT, Spectral characteristics of surface layer turbulence
above sites of varying surface structure derived from FLUXNET monitoring
sites. . 25th Conference on Agricultural and Forest Meteorology.
May, 2002. Norfolk, VA.
May 12. DDB Attended GTCE/BASIN Workshop on Biological controls
on the stable isotope composition of atmospheric carbon dioxide,
methane and nitrous oxide: process and applications, Banff, Alberta,
Canada,May 12-14 2002 and presented the talk entitled: "Interpreting
Stable Carbon Isotope Fluxes and Concentrations in a Deciduous Forest
with a Biophysical Model." (co-authored with Dave Bowling).
April
New Publications
Gu, L., D.D. Baldocchi, S. B. Verma, T. A. Black, T. Vesala, E.
M. Falge, P.R. Dowty. 2002. Superiority of diffuse radiation for
terrestrial ecosystem productivity. Journal of Geophysical Research
107.
March.
Meetings/Seminars
Liukang Xu gave a seminar at the Biogeochemistry Seminar series
on current research on the oak savanna ecosystem.
DDB and LX attended the UC Oak Hardwood Working Group meeting in
Lodi and gave a presentation on the oak savanna research. Xu also
lead a field trip of UC Extension agents and Professors at the Tonzi
ranch.
DDB represented FLUXNET and attended the CARBOEUROPE meeting in
Budapest. He as also charged with chairing the External Review committee,
whose members included John Finnigan, Gen Inoue, Pieter Tans, Roger
Francey.
January.
Meetings
DDB represented Fluxnet at the Asia Flux meeting. A report has
been submitted to the Fluxnet web page
