The Harvard Forest
Environmental Measurement Station began measurements in the fall of 1989. The
objectives at this site are to make long-term measurements of net carbon
exchange, canopy-atmosphere exchange of selected trace gases, and regional
atmospheric chemistry. The Harvard Forest EMS is a component of the Harvard Forest LTER site and
the Northeastern Regional
the DOE National Institute for Climatic Change Research (NICCR). My emphasis has been on the
regional atmospheric chemistry and nitrogen deposition, and long-term trends in
S., C. Barford, S. Wofsy, C. Kucharik, E. Pyle, J. Budney, D. Fitzjarrald,
M. Czikowsky, J. W. Munger, (2007) Factors
Controlling CO2 Exchange at Harvard Forest on Hourly to
Annual Time Scales, J. Geophys Res., 112,
B. H., J. W. Munger, A. H. Goldstein and S. C. Wofsy (2006), Anthropogenic emissions of nonmethane hydrocarbons in
the northeastern United
States: measured seasonal variations
from 1992-1996 and 1999-2001, J. Geophys. Res., 111(D20307), doi:10.1029/2005JD006172.
- Horii, C.,
J. W. Munger, S. Wofsy, M. Zahniser, D. Nelson and J. B. McManus (2006)
Atmospheric reactive nitrogen concentrations and flux budgets at a northeastern
U. S. forest site, Agric. and Forest Meteorology,
Horii C. V., J. W. Munger, S. C. Wofsy, M.
Zahniser, D. Nelson, J. B. McManus (2004), Fluxes of nitrogen oxides over
a temperate deciduous forest, J. Geophys. Res., 109, D08305,
- DeBell , L. J., R. W. Talbot, J. E. Dibb, J. W. Munger,
E. V. Fischer, and S. E. Frolking (2004) A major regional air pollution
event in the northeastern U.S.
caused by extensive forest fires in Quebec, Canada,
J. Geophys. Res. 109, D19305, doi:10.1029/2004JD004840.
- Barford, C. C.,
S. C. Wofsy, M. L. Goulden, J. W. Munger, E. H. Pyle, S. P Urbanski, L. Hutyra,
S. R. Saleska, D Fitzjarrald. K. Moore (2001) Factors Controlling Long- and Short-Term
Sequestration of Atmospheric CO2 in a Mid-latitude
Forest Science 294:
Munger, J. W., S. C. Wofsy, P. S. Bakwin, S.-M. Fan, M. L. Goulden, B. C.
Daube, A H. Goldstein, K. E. Moore, and D.
R. Fitzjarrald, Atmospheric Deposition of Reactive Nitrogen Oxides and
Ozone in a Temperate Deciduous Forest and a Sub-arctic Woodland. 1.
Measurements and mechanisms, J. Geophys. Res. 101, 12,639-12,657,
Munger, J. W., S.-M. Fan, P. S. Bakwin, M. L.
Goulden, A. H. Goldstein, A. S. Colman, S. C. Wofsy, Regional budgets for
nitrogen oxides from continental sources: Variations of rates for oxidztion and deposition with season and distance from
source regions, J. Geophys. Res. 103, 8355-8368, 1998. full
text (pdf format)
Hirsch, A.I., J. W. Munger, D. J. Jacob, L.W.
Horowitz and A. H. Goldstein, Seasonal variation of the ozone production
efficiency per unit NOx at Harvard Forest, Massachusetts, J.
Geophys. Res., 101, 12659-12666, 1996.
Harvard Forest New Directions
Determination of HONO and NO2 flux and concentration over forest
canopies using quantum cascade laser absorption spectroscopy
J. William Munger and Mark Zahniser
An NSF-funded project started
in 2008 to construct a 2-channel Quantum-Cascade Laser Absorption Spectrometer
capable of high frequency measurement of HONO and NO2 to measure
exchange of HONO and NO2 over the
LBA - Brazil
Our lab participated in the LBA project to measure CO2 Fluxes/Concentrations
and CO concentrations and ancillary meteorological parameters at a tower
site in primary forest near the Tapjos River, and
at a coastal site near Natal.
see our LBA project web site.
My focus has been on the CO and CO2 concentration
gradient across the region.
S. R., S. D. Miller, D. M. Matross, M. L. Goulden, S. C. Wofsy, H. R.
da Rocha, P. B. de Camargo, P. Crill, B. C. Daube, H. C.
de Freitas, L. Hutyra, M. Keller, V. Kirchhoff, M. Menton, J. W.
Munger, E. H. Pyle, A. H. Rice, H. Silva (2003) Carbon in Amazon forests:
unexpected seasonal fluxes and disturbance-induced losses, Science,
L. R., J. W. Munger, E. Hammond-Pyle, S. R. Salesk,
N. Restrepo-Coupe, B. C. Daube, P. B. de
Camargo, S. C. Wofsy (2008), Resolving systematic errors in estimates of
net ecosystem exchange of CO2 and ecosystem respiration in a
tropical forest biome, Agricultural and Forest Meteorology, 148,
L. R., J. W. Munger, S. R. Saleska, E. Gottlieb,
B. C. Daube, A. L. Dunn, D. F. Amaral, P. B. de
Camargo, and S. C. Wofsy (2007), Seasonal controls on
the exchange of carbon and water in an Amazonian rain forest, J. Geophys. Res., 112,
As part of the Harvard University China Project in
collaboration with Hao Jiming
and Yuxuan Wang at Tsinghua University
a measurement station was set up near Miyun, north of Beijing. Measurements of CO, CO2, O3,
SO2, and NO/NOy are being made there to test and evaluate
regional atmospheric models.
See recent publication in Atmospheric Chemistry and Physics
Wang, Y., M. B. McElroy, J. W. Munger, Jiming
Hao, Hong Ma, C. P. Nielsen, Yaosheng
Chen, Variations of O3 and CO in summertime at a rural site
near Beijing , Atmos Chem. Phys. 8, 6355-6363, 2008
Examples of data analysis and interpretation
(Excerpts from a poster session at the Fall 1997
jwm with questions or comments
click here for site details and prior results
of Harvard Forest Results
Greenland Ice Sheet Project
Munger, J. W.,
D. J. Jacob, S.-M. Fan, A. S Colman, and J. E. Dibb, Concentrations and
Snow-Atmosphere Fluxes of Reactive Nitrogen at Summit, Greenland, J.
Geophys. Res., 104, 13,721-13,734, 1999. (pdf version)
NOy concentrations and fluxes to
go to Greenland
- Cloudwater chemistry in Shenandoah Mountains
- Cloudwater chemistry in California
The Chemical Composition of Fogs and Clouds in Southern
California, Ph.D. Thesis, California Institute of Technology, Pasadena, CA,
Environmental controls and ecological
consequences of regional precipitation chemistry in Minnesota,
M.S Thesis, University of Minnesota,
last updated Feb. 3, 2009