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A comparison of techniques for magnetotelluric response function estimation

Creator:: Jones, Alan G., Chave, Alan D., Egbert, Gary D., Auld, Don, and Bahr, Karsten
Abstract:: Spectral analysis of the time-varying horizontal magnetic and electric field components yields the magnetotelluric (MT) impedance tensor. This frequency dependent 2x2 complex tensor can be examined for details which axe diagnostic of the electrical conductivity distribution in the Earth within the relevant (frequency dependent) inductive scale length of the surface...
Resource Type:: Article
Full Text:: studies. IEEE Trans. Acoust. Speech Signal Process., ASSP- 29, 317-319, 1981. Jones, A.G. and R. Hutton

Leg 202 summary

Creator:: Mix, Alan C., Tiedemann, R., and Blum, P.
Abstract:: More than 7 km of long and relatively continuous sediment sequences from 11 sites in the southeast and equatorial Pacific were recovered during Leg 202 for the study of the Earth’s climate and biogeochemical systems on scales that range from tectonic (millions of years) to orbital (tens to hundreds of...
Resource Type:: Article
Full Text:: Ir202_01.fm Mix, A.C., Tiedemann, R., Blum, P., et al

Anthropogenic CO₂ invasion into the northeast Pacific based on concurrent δ¹³CDIC and nutrient profiles from the California Current

Creator:: Ortiz, Joseph D., Mix, Alan C., Wheeler, Patricia A., and Key, R. M.
Abstract:: The stable isotopic signature of dissolved inorganic carbon (δ¹³CDIC) in the northeast Pacific Ocean is lower in near-surface waters by 1.1‰ relative to values predicted from global oceanic trends of δ¹³CDIC versus nutrients. A combination of anthropogenic carbon uptake from the atmosphere and thermodynamic, air-sea gas exchange processes in different...
Resource Type:: Article
Full Text:: , Corvallis R. M. Key Department of Geosciences, Princeton University, Princeton, New Jersey Abstract

Vanadium in foraminiferal calcite as a tracer for changes in the areal extent of reducing sediments

Creator:: Hastings, David W., Emerson, Steven R., and Mix, Alan C.
Abstract:: We have used the vanadium concentration in cleaned foraminiferal calcite as a tracer of seawater V changes in the past. Since the benthic flux of vanadium is sensitive to the redox potential of sediments, changes in the vanadium concentration of seawater should be a reflection of changes that control the...
Resource Type:: Article
Full Text:: sediments David W. Hastings1 and Steven R. Emerson School of Oceanography, University of Washington

Forest wildfire, fuel reduction treatments, and landscape carbon stocks: A sensitivity analysis

Creator:: Campbell, John L. and Ager, Alan A.
Abstract:: Fuel reduction treatments prescribed in fire-suppressed forests of western North America pose an apparent paradox with respect to terrestrial carbon management. Such treatments have the immediate effect of reducing forest carbon stocks but likely reduce future carbon losses through the combustion and mortality caused by high-severity wildfires. Assessing the long-term...
Resource Type:: Article
Full Text:: sensitivity analysis John L. Campbell a,*, Alan A. Ager b aDepartment of Forest Ecosystems and Society

Can carbon isotopes be used to predict watershed-scale transpiration?

Creator:: Pypker, T. G., Barnard, H. R., Hauck, M., Sulzman, E. W., Unsworth, Michael H., Mix, Alan C., Kennedy, A. M., and Bond, B. J.
Abstract:: The Penman‐Monteith equation is often used to estimate transpiration, but an important limitation to this approach, especially for mountainous forested sites, is an accurate estimate of canopy conductance averaged over the area of interest (Gs). We propose a method for estimating watershed‐scale transpiration using estimates of Gs derived from measurements...
Resource Type:: Article
Full Text:: -scale transpiration? T. G. Pypker,1 H. R. Barnard,2 M. Hauck,2 E. W. Sulzman,3 M. H. Unsworth,4 A. C

Euphotic zone depth: Its derivation and implication to ocean-color remote sensing

Creator:: Lee, ZhongPing, Weidemann, Alan, Kindle, John, Arnone, Robert, Carder, Kendall L., and Davis, Curtiss
Abstract:: Euphotic zone depth, z[subscript]1%, reflects the depth where photosynthetic available radiation (PAR) is 1% of its surface value. The value of z[subscript]1% is a measure of water clarity, which is an important parameter regarding ecosystems. Based on the Case-1 water assumption, z[subscript]1% can be estimated empirically from the remotely derived...
Resource Type:: Article
Full Text:: remote sensing ZhongPing Lee,1 Alan Weidemann,1 John Kindle,1 Robert Arnone,1 Kendall L. Carder,2 and

Magnetotelluric observations across the Juan de Fuca subduction system in the EMSLAB project

Creator:: Wannamaker, Philip E., Booker, John R., Filloux, Jean H., Jones, Alan G., Jiracek, George R., Chave, Alan D., Tarits, Pascal, Waff, Harve S., Egbert, Gary D., Young, Charles T., Stodt, John A., Martinez, Mario G., Law, Lawrie K., Yukutake, Takesi, Segawa, Jiro S., White, Anthony, and Green, A.W.
Abstract:: A magnetotelluric (MT)transect has been obtained near latitude 45øN from the active Juan de Fuca Spreading center, across the subduction zone and Cascades volcanic arc, and into the back arc Deschutes Basin region. This paper presents the MT data set and describes its major characteristics as they pertain to the...
Resource Type:: Article
Full Text:: EMSLAB Project PHILIP E. WANNAMAKER, 1 JOHN R. BOOKER, JEAN H. FILLOUX, ALAN (3. JONES, GEORGE R

Fire-mediated pathways of stand development in Douglas-fir/ western hemlock forests of the Pacific Northwest, USA

Creator:: Tepley, Alan J., Swanson, Frederick J., and Spies, Thomas A.
Abstract:: Forests dominated by Douglas-fir and western hemlock in the Pacific Northwest of the United States have strongly influenced concepts and policy concerning old-growth forest conservation. Despite the attention to their old-growth characteristics, a tendency remains to view their disturbance ecology in relatively simple terms, emphasizing infrequent, stand-replacing (SR) fire and...
Resource Type:: Article
Full Text:: / western hemlock forests of the Pacific Northwest, USA ALAN J. TEPLEY,1,3 FREDERICK J. SWANSON,2 AND

Estimating vertebrate, benthic macroinvertebrate, and diatom taxa richness in raftable Pacific Northwest rivers for bioassessment purposes

Creator:: Hughes, Robert M., Herlihy, Alan T., Gerth, William J., and Pan, Yangdong
Abstract:: The number of sites sampled must be considered when determining the effort necessary for adequately assessing taxa richness in an ecosystem for bioassessment purposes; however, there have been few studies concerning the number of sites necessary for bioassessment of large rivers. We evaluated the effect of sample size (i.e., number...
Resource Type:: Article
Full Text:: taxa richness in raftable Pacific Northwest rivers for bioassessment purposes Robert M. Hughes & Alan

ScholarsArchive@OSU

A comparison of techniques for magnetotelluric response function estimation

Leg 202 summary

Anthropogenic CO₂ invasion into the northeast Pacific based on concurrent δ¹³CDIC and nutrient profiles from the California Current

Vanadium in foraminiferal calcite as a tracer for changes in the areal extent of reducing sediments

Forest wildfire, fuel reduction treatments, and landscape carbon stocks: A sensitivity analysis

Can carbon isotopes be used to predict watershed-scale transpiration?

Euphotic zone depth: Its derivation and implication to ocean-color remote sensing

Magnetotelluric observations across the Juan de Fuca subduction system in the EMSLAB project

Fire-mediated pathways of stand development in Douglas-fir/ western hemlock forests of the Pacific Northwest, USA

Estimating vertebrate, benthic macroinvertebrate, and diatom taxa richness in raftable Pacific Northwest rivers for bioassessment purposes

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