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Publications Found: 29

Ecological Controls On Net Ecosystem Productivity Of A Seasonally Dry Annual Grassland Under Current And Future Climates: Modelling With Ecosys
Grant, R., Baldocchi, D., Ma, S.

Net ecosystem productivity (NEP) of seasonally dry grasslands in Mediterranean climate zones is determined by the duration and intensity of rainy vs. dry seasons. Precipitation in these zones is expected to decline with climate change during the next century, possibly reducing NEP. Ecosystem models used to study climate …

Journal: Agricultural And Forest Meteorology, Volume 152: 189-200 (2012), ISBN . DOI: 10.1016/j.agrformet.2011.09.012 Sites: US-Var

Interannual Variability Of Evapotranspiration And Energy Exchange Over An Annual Grassland In California
Ryu, Y, Baldoicchi, D. D., Ma, S., Hehn, T.

We report on the interannual variability of evapotranspiration (E) and energy exchange of an annual grassland in the Mediterranean climate zone of California. They were measured directly with the eddy covariance technique over a 6-year period that spanned between July 2001 and June 2007 and experienced a large range …

Journal: Journal Of Geophysical Research, Volume 113 (D09104): n/a-n/a (2008), ISBN . DOI: 10.1029/2007jd009263 Sites: US-Var

Inter-Annual Variability In Carbon Dioxide Exchange Of An Oak/Grass Savanna And Open Grassland In California
Ma, S., Baldocchi, D. D., Xu, L., Hehn, T.

To understand the dynamics of ecosystem carbon cycling, CO₂ fluxes were measured over and under an oak–grass savanna and over a proximate grassland in California. The measurements were made from 2000 to 2006 using the eddy covariance technique. Annual net carbon exchange (NEE) ranged from −155 to −56 gC m⁻² year⁻¹ …

Journal: Agricultural And Forest Meteorology, Volume 147 (3-4): 157-171 (2007), ISBN . DOI: 10.1016/j.agrformet.2007.07.008 Sites: US-Ton, US-Var

Upscaling Fluxes From Tower To Landscape: Overlaying Flux Footprints On High-Resolution (IKONOS) Images Of Vegetation Cover
Kim, J., Guo, Q., Baldocchi, D., Leclerc, M., Xu, L., Schmid, H.

In this paper, we describe the process of assessing tower footprint climatology, spatial variability of site vegetation density based on satellite image analysis, and sensor location bias in scaling up to 1 km × 1 km patch. Three flat sites with different vegetation …

Journal: Agricultural And Forest Meteorology, Volume 136 (3-4): 132-146 (2006), ISBN . DOI: 10.1016/j.agrformet.2004.11.015 Sites: US-SP1, US-Ton, US-Var

Midday Values Of Gross CO2 Flux And Light Use Efficiency During Satellite Overpasses Can Be Used To Directly Estimate Eight-Day Mean Flux
Sims, D. A., Rahman, A. F., Cordova, V. D., Baldocchi, D. D., Flanagan, L. B., Goldstein, A. H., Hollinger, D. Y., Misson, L., Monson, R. K., Schmid, H. P., Wofsy, S. C., Xu, L.

Most satellites provide, at best, a single daily snapshot of vegetation and, at worst, these snapshots may be separated by periods of many days when the ground was obscured by cloud cover. Since vegetation carbon exchange can be very dynamic on diurnal and day-to-day timescales, the limited temporal resolution of satellite data is …

Journal: Agricultural And Forest Meteorology, Volume 131 (1-2): 1-12 (2005), ISBN . DOI: 10.1016/j.agrformet.2005.04.006 Sites: CA-Let, US-Blo, US-Ho1, US-MMS, US-NR1, US-Ton, US-Var

Objective Threshold Determination For Nighttime Eddy Flux Filtering
Gu, L., Falge, E. M., Boden, T., Baldocchi, D. D., Black, T., Saleska, S. R., Suni, T., Verma, S. B., Vesala, T., Wofsy, S. C., Xu, L.

We recommend an automated statistical method (Moving Point Test, or MPT) to determine the friction velocity (u_*) thresholds in nighttime eddy flux filtering. Our intention is to make the determination of the u_* thresholds objective and reproducible and to keep flux treatment consistent over …

Journal: Agricultural And Forest Meteorology, Volume 128 (3-4): 179-197 (2005), ISBN . DOI: 10.1016/j.agrformet.2004.11.006 Sites: BR-Sa1, CA-Oas, US-Shd, US-Ton, US-Var

Seasonal Variation In Carbon Dioxide Exchange Over A Mediterranean Annual Grassland In California
Xu, L., Baldocchi, D. D.

Understanding how environmental variables affect the processes that regulate the carbon flux over grassland is critical for large-scale modeling research, since grasslands comprise almost one-third of the earth’s natural vegetation. To address this issue, fluxes of CO₂ (F_c, flux toward the …

Journal: Agricultural And Forest Meteorology, Volume 123 (1-2): 79-96 (2004), ISBN . DOI: 10.1016/j.agrformet.2003.10.004 Sites: US-Var

How Plant Functional-Type, Weather, Seasonal Drought, And Soil Physical Properties Alter Water And Energy Fluxes Of An Oak–Grass Savanna And An Annual Grassland
Baldocchi, D. D., Xu, L., Kiang, N.

Savannas and open grasslands often co-exist in semi-arid regions. Questions that remain unanswered and are of interest to biometeorologists include: how do these contrasting landscapes affect the exchanges of energy on seasonal and annual time scales; and, do biophysical constraints imposed by water supply and water demand …

Journal: Agricultural And Forest Meteorology, Volume 123 (1-2): 13-39 (2004), ISBN . DOI: 10.1016/j.agrformet.2003.11.006 Sites: US-Ton, US-Var

How Soil Moisture, Rain Pulses, And Growth Alter The Response Of Ecosystem Respiration To Temperature
Xu, L., Baldocchi, D. D., Tang, J.

In this paper, we analyzed 3 years of carbon flux data from continuous eddy covariance measurements to investigate how soil moisture, rain pulses, and growth alter the response of ecosystem respiration …

Journal: Global Biogeochemical Cycles, Volume 18 (4): n/a-n/a (2004), ISBN . DOI: 10.1029/2004gb002281 Sites: US-Ton, US-Var

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