Index Catalog // ScholarsArchive@OSU

Creator:: Matheson, Mark A., Coakley, James A., and Tahnk, William R.
Abstract:: Empirical estimates of the aerosol indirect radiative forcing often rely on threshold cloud retrievals applied to multispectral satellite imagery data. In such retrievals, pixels having radiances that surpass prescribed thresholds are assumed to be overcast even if they are only partially cloud covered. This assumption leads to cloud visible optical...
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Full Text:: aerosol indirect radiative forcing Mark A. Matheson,1,2 James A. Coakley Jr.,1 and William R. Tahnk1

Creator:: Somes, Christopher J., Schmittner, Andreas, and Altabet, Mark A.
Abstract:: Nitrogen (N) fixation by specialized microorganisms (diazotrophs) influences global plankton productivity because it provides the ocean with most of its bio-available N. However, its global rate and large-scale spatial distribution is still regarded with considerable uncertainty. Here we use a global ocean nitrogen isotope model, in comparison with δ15NO3 observations,...
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Full Text:: . Somes,1 Andreas Schmittner,1 and Mark A. Altabet2 4 Received 1 July 2010; revised 8 September 2010

Creator:: Nielsen, Mark E. and Fisk, Martin R.
Abstract:: These first measurements of specific surface area (SSA) of bulk samples of subsurface marine basalts were undertaken to determine the potential area available for microbial colonization. SSA ranged from 0.3 to 52 m2/g of basalt with the lowest value coming from pillow basalt and the highest value from breccia. The...
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Full Text:: : Implications for the subseafloor microbial biomass Mark E. Nielsen1 and Martin R. Fisk2 Received 24 May 2010

Creator:: Goni, Miguel A., Thunell, Robert C., Woodwort, Mark P., and Müller-Karger, Frank E.
Abstract:: Analysis of sediments from two wind-driven upwelling systems, Guaymas and Cariaco basins, using the alkenonebased U_37^(K^' ) paleothermometer yielded high-resolution records of sea surface temperatures (SST) from 1700 to 2000 AD. The trends in the U K'/37 index reveal steady SST increases of 1 to 2°C at both sites since...
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Full Text:: last three centuries: Interocean teleconnections Miguel A. Goni,1 Robert C. Thunell,2 Mark P

Creator:: Letelier, Ricardo M., Abbott, Mark R., and Karl, David M.
Abstract:: Variability of solar-induced (natural) fluorescence and chlorophyll were measured on scales of hours to weeks in the upper layer of a cyclonic eddy located south of the Antarctic Polar Front using a free-floating drifter. The fluorescence signal was analyzed both in terms of chlorophyll concentration and as an indicator of...
Resource Type:: Article

Creator:: Brook, Edward J., Kurz, Mark D., Curtice, Joshua, and Cowburn, Stuart
Abstract:: Measurements of helium isotopes in particles separated from polar ice demonstrate that extraterrestrial ³He dominates the ³He flux at the GISP2 (Greenland) and Vostok (Antarctica) ice core sites. Replicate measurements of late Holocene ice samples yield ³He fluxes of 0.62±0.27×10⁻¹² cm³ STP cm⁻² ka⁻¹ (GISP2) and 0.77 ± 0.25 ×...
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Full Text:: , USA Mark D. Kurz and Joshua Curtice Department of Marine Chemistry and Geochemistry, Woods Hole

Creator:: Brown, Erik Thorson, Brook, Edward J., Raisbeck, Grant M., Yiou, Francoise, and Kurz, Mark D.
Abstract:: We have measured cosmic ray produced ¹⁰Be (t₁/₂ = 1.5 My) and ²⁶Al (t₁/₂ = 0.72 My) as functions of depth in a core of quartz sandstone bedrock collected in South Victoria Land, Antarctica. These data were used to place limits on the exposure age and erosion rate of the...
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Full Text:: . Brook 2, Grant M. Raisbeckl, Fran•oise YiouI, and Mark D. Kurz2 Abstract. We have measured cosmic ray

Creator:: Preston, Daniel L., Caine, Nel, McKnight, Diane M., Williams, Mark W., Hell, Katherina, Miller, Matthew P., Hart, Sarah J., and Johnson, Pieter T. J.
Abstract:: High-elevation aquatic ecosystems are highly vulnerable to climate change, yet relatively few records are available to characterize shifts in ecosystem structure or their underlying mechanisms. Using a long-term data set on seven alpine lakes (3126 to 3620 m) in Colorado, USA, we show that ice-off dates have shifted 7 days earlier over...
Resource Type:: Article

Creator:: Moore, Keith J., Abbott, Mark R., Richman, James G., Smith, Walker O., Cowles, Timothy J., Coale, Kenneth H., Gardner, Wilford D., and Barber, Richard T.
Abstract:: SeaWiFS estimates of surface chlorophyll concentrations are reported for the region of the U.S. JGOFS study in the Southern Ocean (∼ 170 °W, 60 °S). Elevated chlorophyll was observed at the Southern Ocean fronts, near the edge of the seasonal ice sheet, and above the Pacific Antarctic Ridge. The elevated...
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Full Text:: data from the Southern Ocean J. Keith Moore l, Mark R. Abbott l, James G. Richman l, Walker O. Smith

Creator:: Hall, George F., Hill, David F., Horton, Benjamin P., Engelhart, Simon E., and Peltier, W. R.
Abstract:: Tides in the Delaware Bay (USA) have been modeled from 7000 years before present (7 ka) to the present day and for selected future sea-level rise scenarios (100 years, 300 years). Historic bathymetries were constructed through use of glacial isostatic adjustment models and a very high spatial resolution (< 100...
Resource Type:: Article
Full Text:: . Guntenspergen, A. D’Alpaos, J. T. Morris, S. M. Mudd, and S. Temmerman (2010), Limits on the adaptability of

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