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Great Lakes Ecosystem: 1993 Midwest Oak Savanna Conference [Chapman]03-09-2006

Deep sands without layers that impede drainage support oak barrens on flat ground ... series is a Typic Entisol (dry B horizon, no clay layer in B2 horizon) with lower water content at field capacity than the Zimmerman series, and Alfic Entisol (clay layer in B2 horizon) (Grigal et al ...

http://www.epa.gov/ecopage/upland/oak/oak93/chapman.html (HTML)

Final Report | Development and Evaluation of a Shallow Convection Parameterization for Mesoscale Models

... the new shallow-cloud parameterization to existing advanced parameterizations of deep convection and turbulent planetary boundary layer (PBL) processes, with an emphasis on providing a smooth transition ...

http://cfpub.epa.gov/ncer_abstracts/index.cfm/fuseaction/display.abstr... (HTML)

Great Lakes Ecosystem: 1994 Proceedings of the Midwest Oak Savanna Conferences [Nuzzo]03-09-2006

... 10 to 50 percent canopy cover, little or no shrub layer, and a ground layer dominated by prairie grasses and herbs.

http://www.epa.gov/ecopage/upland/oak/oak94/Proceedings/Nuzzo.html (HTML)

EPA Exposure Research - Ecosystems Research Division Publications: 200903-04-2009

Extending the Diffuse Layer Model of Surface Acidity Behavior: III... Light scattering techniques are limited by poor resolution and the scattering intensity dependence on particle size ...

http://cfpub.epa.gov/ordpubs/nerlpubs/nerlpubs_erd_2009.cfm?ActType=Pu... (HTML)

Great Lakes Ecosystems: 1994 Midwest Oak Ecosystem Recovery Plan03-09-2006

... Savannas (that are not degraded) typically have only two structural layers, an open tree canopy and an herbaceous groundlayer; or a woody shrub layer with an herbaceous ground layer ... was applied to areas with a continuous, usually tall, grass layer with scattered trees.

http://www.epa.gov/ecopage/upland/oak/oak94/erp.html (HTML)

2002 Annual Report | Investigations of Factors Determining the Occurrence of Ozone and Fine Particles in Northeastern USA02-26-2004

... included a wide range of instruments that measured the surface layer and boundary layer properties... included a wide range of instruments that measured the surface layer and boundary layer properties.

http://cfpub.epa.gov/ncer_abstracts/index.cfm/fuseaction/display.abstr... (HTML)

EPA - TTN NAAQS OTAG Technical Supporting Document Chapter 4 - Part 303-04-2008

The mixed layer depth extended up to about 2 km, and ozone concentrations above the mixed layer were about 50 ppb (aircraft data ...

http://www.epa.gov/ttn/naaqs/ozone/rto/otag/finalrpt/chp4/final3.htm (HTML)

EPA - TTN NAAQS OTAG Technical Supporting Document Chapter 4 - Air Quality Analysis Workgroup03-04-2008

... few simulation days indicate that ozone levels above the surface layer (> 200 m) may be underpredicted by the m odel.

http://www.epa.gov/ttn/naaqs/ozone/rto/otag/finalrpt/chp4/final.htm (HTML)

Ecosystems | Great Lakes | US EPA02-28-2007

... terms were oak openings, oak barrens, oak scrub, brush prairie, scattered timber, open woodland and prairie with scattered trees (Nuzzo 1986.

http://www.epa.gov/ecopage/upland/oak/oak93/hruska.html (HTML)

EPA Probabilistic Sampling Data Browser12-04-2009

Scatter plot... Riparian 3-Layers Present (Fract... Rip Ground Layer Barren (Cover... Riparian Veg Ground Layer Cover... Riparian 3-Layers Present (Fract.

http://www.epa.gov/bioindicators/statprimer/ProbabilisticSampling/ (HTML)

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