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Canopy And Leaf Level 2-Methyl-3-Buten-2-Ol Fluxes From A Ponderosa Pine Plantation

by Fianna O'Brien - January 30, 2017

Canopy and leaf level 2-methyl-3-butene-2-ol (methylbutenol, MBO) emissions were measured from a ponderosa pine plantation in the Sierra Nevada mountains from July to October 1998. Canopy scale fluxes were measured… More

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Evapotranspiration Models Compared On A Sierra Nevada Forest Ecosystem

by Fianna O'Brien - January 30, 2017

Evapotranspiration, a major component in terrestrial water balance and net primary productivity models, is difficult to measure and predict. This study compared five models of potential evapotranspiration (PET) applied to… More

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Influences Of Canopy Photosynthesis And Summer Rain Pulses On Root Dynamics And Soil Respiration In A Young Ponderosa Pine Forest

by Fianna O'Brien - January 30, 2017

Our first objective was to link the seasonality of fine root dynamics with soil respiration in a ponderosa pine (Pinus ponderosa P. & C. Lawson) plantation located in the Sierra… More

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The Influence Of Light Environment On Photosynthesis And Basal Methylbutenol Emission From Pinus Ponderosa

by Fianna O'Brien - January 30, 2017

Methylbutenol is a 5-carbon alcohol that is produced and emitted by several species of pine in western North America, and may have important impacts on the tropospheric chemistry of this… More

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Characteristics Of Fine Particle Growth Events Observed Above A Forested Ecosystem In The Sierra Nevada Mountains Of California

by Fianna O'Brien - January 30, 2017

Atmospheric aerosols from natural and anthropogenic processes have both primary and secondary origins, and can influence human health, visibility, and climate. One key process affecting atmospheric concentrations of aerosols is… More

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Observations Of Oxidation Products Above A Forest Imply Biogenic Emissions Of Very Reactive Compounds

by Fianna O'Brien - January 30, 2017

Vertical gradients of mixing ratios of volatile organic compounds have been measured in a Ponderosa pine forest in Central California (38.90° N, 120.63° W, 1315m). These measurements reveal large quantities… More

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In Situ Measurements Of C2 -C10 Volatile Organic Compounds Above A Sierra Nevada Ponderosa Pine Plantation

by Fianna O'Brien - January 30, 2017

A fully automated gas chromatograph-flame ionization detector system was designed and built to measure ambient concentrations of C2-C10 volatile organic compounds, including many oxygenated compounds, without using liquid cryogen. It… More

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Gas-Phase Chemistry Dominates O3 Loss To A Forest, Implying A Source Of Aerosols And Hydroxyl Radicals To The Atmosphere

by Fianna O'Brien - January 27, 2017

Tropospheric ozone (O3) effectively deposits to forested ecosystems but the fate of O3 within the forest canopy is unresolved. We partitioned total measured ecosystem daytime O3 deposition to a ponderosa… More

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Partitioning Of Water Flux In A Sierra Nevada Ponderosa Pine Plantation

by Fianna O'Brien - January 27, 2017

The weather patterns of the west side of the Sierra Nevada Mountains (cold, wet winters and hot, dry summers) strongly influence how water is partitioned between transpiration and evaporation and… More

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Fluxes Of Oxygenated Volatile Organic Compounds From A Ponderosa Pine Plantation

by Fianna O'Brien - January 27, 2017

We present the first canopy-scale, continuous, long-term flux measurements of a suite of oxygenated volatile organic compounds (OVOCs). Fluxes were measured above a ponderosa pine plantation, adjacent to the Blodgett… More

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