Oceanography and Atmospheric Sciences and Meteorology Commons^™

Acceleration Of Nutrient Uptake By Phytoplankton In A Coastal Upwelling Ecosystem: A Modeling Analysis, Richard C. Zimmerman, James N. Kremer, Richard C. Dugdale

OES Faculty Publications

Studies of upwelling centers in the eastern Pacific suggest that maximum rates of nitrate uptake (light and nutrient saturated) increase, or shift-up, as newly upwelled water moves downstream. The rate of shift-up appears to be related to irradiance and the ambient concentration of limiting nutrient at the time of upwelling. A mathematical model was developed to evaluate effects of irradiance and initial nitrate concentration on temporal patterns of shift-up and subsequent time scales of nutrient utilization over a range of simulated upwelling conditions. When rates consistent with field studies were used, complete shift-up was possible only under certain conditions, and …

Shoreward Intrusion Of Upper Gulf Stream Water Onto The United States Southeastern Continental Shelf, Lie-Yauw Oey, Larry P. Atkinson, Jackson O. Blanton

CCPO Publications

In winter, cooling of the South Atlantic Bight continental shelf water results in higher density in the middle shelf region relative to the shelf-break region where the western flank of the Gulf Stream flows. Shoreward, estuarine-like intrusion of the upper Gulf Stream water in the presence of such a positive onshore density gradient is then possible through advective processes triggered either by the meander of the Stream or onshore Ekman transports by southward wind stresses. Repeated cross-shelf hydrographic transects were conducted from 10 January through 30 January 1986 to more closely study this intrusion process. These observations show many features …

The Relationship Of Upwelling To Mussel Production In The Rias On The Western Coast Of Spain, Jack O. Blanton, Kenneth R. Tenore, F. Castillejo, Larry P. Atkinson, Franklin B. Schwing, Amy Lavin

CCPO Publications

We have calculated an upwelling index for each month over a 17-year period (1969-1985) for a point off the western coast of Spain. We interpret April through September values of the index to indicate the flux of nitrate-rich water in the Spanish Rias. The index representing the 6-month upwelling series has been correlated with an index representing the conditions of mussels grown during that season on rafts in Ria de Arosa. Two seasons represent extreme upwelling conditions over the 17-year sampling period: 1977 when the upwelling index was the highest, and 1983 when it was the lowest. A comparison of …

The Geochemistry Of Interstitial Water For A Sediment Core From The Indian River Lagoon, Florida, Deyu Gu, Nenad Iricanin, John H. Trefry

Ocean Engineering and Marine Sciences Faculty Publications

Chemical results for interstitial water from organic-rich sediments in the Indian River Lagoon, Florida, show a classic picture of biogeochemical reactions in anoxic environments. Interstitial nitrate was depleted throughout the sediment column and complete sulfate reduction was observed at a depth of <9 cm below the seawater-sediment interface. Interstitial water chlorinity decreased sharply with depth suggesting subsurface occurrence or intrusion of groundwater. Ammonia, phosphate and silica concentrations were high showing significant nutrient regeneration. Dissolved sulfide levels were also high and play a primary role in controlling interstitial water metal concentrations.

Winter Waterlogging Effects On Crops And Pasture Production., D. J. Mcfarlane

Experimental Summaries - Plant Research

Trial 87NA76

Location: Dryandra, Rosendale Central, Tutanning, Yornaning South, Yornaning West

To quantify the physical extent and economic significance of winter waterlogging on crop and pasture production in the Upper Great Southern Region of Western Australia.

Trial 67n4, I Rowland, W Hawkins

Experimental Summaries - Plant Research

Trial 67N4. Location Newdegate Research Station. Long term rotation trials.

An old land site, cleared in 1951 and in pasture (Dwalganup sub clover) from 1963 to 1967. All plots were sown to Nungarin sub clover, by 1982 all plots had been resown.

Pasture Agronomy Branch, Pasture Growth Rates., P Booth

Experimental Summaries - Plant Research

Location: Shire of Augusta-Margaret River, Shire of Elgin and Shire of Bridgetown-Greenbushes.

To quantify and identify insect and fungal losses of annual pasture production caused through seedling mortality and early production losses. Three sites in the Margaret River/Augusta Shire, one in the Elgin Shire and one in the Bridgetown Shire were used.

Crop Agronomy., S. Porritt

Experimental Summaries - Plant Research

Seeding machinery for stubble retention in lupin cereal rotations, 85LG21, and 85LG22. Dynamic Lifter (cereal mix) fertiliser evaluation, 86LG2. Cultural systems for lupin: wheat rotations on water repellent soils, 87ES2. Stubble retention and Rovral for brownspot control in lupins, 87M66. Straw length Effects on wheat growth on red-brown earths, 87M70. Row spacing and stubble retention effects on wheat growth on red-brown earths, 87M71. Nitrogen fertiliser for wheat production after volunteer pasture or sub clover-based pasture, 87ME73 and 87ME74. Effect of seeding rate and sowing depth on lupin establishment, 87ME75. Time of seeding various wheat varieties, 87WE76.

The Effect Of Soil Acidity On Barley, P J. Dolling, T. D. Haines

Experimental Summaries - Plant Research

Three liming experiments were established to confirm previous estimates of the critical soil acidity level for barley. Two experiments studying the effect of depth of incorporation on the effectiveness of lime, established in 1986, were continued in 1987.
The results from the three liming experiments established this year supported the conclusion that barley is affected by soil acidity at pH's around 4.2 and 4.3 (CaC1₂) and that depth of this acid layer is important.
Significant lime responses were obtained at the Katanning depth of lime incorporation site but conclusions can not be made because of possible mixing of …

Surface Drainage Trial., Department Of Agriculture, Western Australia.

Experimental Summaries - Plant Research

Trial 86V1

Location: Vasse Research Station.

The aim of this experiment was to quantify the response of annual pastures to improved surface drainage by laser levelling and from the pasture response data determine the cost.

Grain Legumes Evaluation., G. H. Walton, T. R. Trent

Experimental Summaries - Plant Research

Lupin agronomy, 87AL14. Nitrogen fertilizer for legume crops, 87BA2. Pea variety evaluation, 87C59, 87M08, 87ME1, 87N012, 87SG8, 87KA7, 87N2. Interstate pea variety trials, 87N096, 87N099, 87KA6. Disease Resistance Pea Variety Testing, 87JE1. Grain legume species comparisons, 87A2, 87C2, 87KA37, 87M09, 87MA1, 87NA15. Legume species variety trials, 87LG2. Faba bean evaluation, 87MC34 and 87KA8. Faba bean 'synthetic' variety yield trial, 87MC36. Faba bean screening nursery, 87MC35. Preliminary agronomy of faba bean, chickpea and lentil, 87A21. Seeding date, 87A22. Legume species herbicide tolerance, 87KA82.

Field Pea Agronomy., I. A. Pritchard, G. Cooper, D. Dodge

Experimental Summaries - Plant Research

Field peas sowing rates, 87A31. Field peas time of sowing, 87A32. Field peas factional agronomy, 87A33. Field pea sowing rates, 87N092. Field peas time of sowing, 87N093. field peas - factorial agronomy, 87N094.

Depth-Controlled Modified Combine For Direct Drilling And Lupin Row Spacing., R. Belford, G Reithmuller

Experimental Summaries - Plant Research

Trial 87WH52, (86M56)

Depth-controlled modified combine for direct drilling.

To compare soil penetration resistance, crop growth, water use, nutrient uptake and root development of wheat 1) sown after scarifying; 2) direct drilled with a combine; 3) direct drilled with the depth-controlled modified combine with loosening ties at 5, 9 or 13 cm; or 4) sown after deep ripping with an Agrowplow to 13 or 30 cm.

Trial 87M82

Location: Merredin Research Station paddock T6 south.

Lupin row spacing

Experiments On Grain Yield In A Range Of Old And Modern Wheat Varieties., K. H.M. Siddique, D. Tennant, R. K. Belford, M. W. Perry, L. Mclaughlin, A. R. Thompson

Experimental Summaries - Plant Research

Growth, yield, water use and water use efficiency of old and modern wheat varieties in a mediterranean type environment, 87M17 and 87WH14. Ear and stem dry matter at anthesis and grain yield in a range of wheat varieties, 87M18.

The Role Of Barley In Future Rotational Systems In Drier Wheatbelt Areas Of Western Australia., P. Simpson

Experimental Summaries - Plant Research

Comparison of barley and wheat yields over four soil types and yield component analysis at Nangeenan NW of Merredin, 86ME88, 86ME89, 86ME90 and 86ME91. Comparison of barley and wheat yields over four soil types at Bodallin, east of Merredin, 86ME92, 86ME93, 86ME94 and 86ME95. Comparison of barley and wheat yields over two ‘levels’ of soil salinity - EC, 87ME63 and 87ME64. Comparison of barley and wheat yields over 2 soils of differing textural type – ‘heavy’ and ‘light’, 87ME65 and 87ME66. Effect of time of sowing on barley and wheat yields, 87ME67.

Trial 67c13, I Rowland, W Hawkins

Experimental Summaries - Plant Research

Trial 67C13. Location paddock 19B on Chapman Research Station (Nabawa).
Long term rotation trials.

An old land site, cleared in 1903. Sown to Dwalganup sub clover in 1964, topdressed each year until the start of the trial in 1967. In 1981 to 83 all plots were reseeded with Northam at 20 kg/ha.

Seed Rate And Nitrogen On Wheat, J W. Bowden

Experimental Summaries - Plant Research

Trial 87MO49

Location: Wannamal

To examine the economic choice of nitrogen and seeding rates in a leaching situation with a high yield potential.
To test the nitrogen section of NP-Decide.
To gather data that enables competition for resources to be examined by regarding the crop as a population of individual plants.

Population Dynamics Of Brome Grass In Relation To Control Systems, A H. Cheam, Stephen Lee, C. M. Ralph, P Nelson

Experimental Summaries - Plant Research

Trial 86C1

Location: East Chapman Research Station.

To identify the level of control of brome grass under various crop rotation systems so that farmers can be advised on the degree of infestation likely to be encountered when using a particular system.
To design the best control system to reduce quickly the anticipated large seed population of brome grass in the soil.

General Comments And Comparative Yields, W Porter, S Carr

Experimental Summaries - Plant Research

General comments and comparative yields on all trials.
87ME77, 87ME78, 87ME79, 87ME80 and 87ME81, 87ME82, 87ME83, 87ME84, 87ME85, 8714E88

The Seasonality And Spatial Patterns Of Juvenile Surf Zone Fishes Of The Florida East Coast, Dennis J. Peters, Walter G. Nelson

Ocean Engineering and Marine Sciences Faculty Publications

Spatial and temporal patterns of variability were examined (April 1982 - June 1983) for 61 species of surf zone fishes (6,611) at beaches in Melbourne and Sebastian, Florida. The three numerically dominant species, Harengula jaguana, Anchoa lyolepis, and Trachinotus carolinus, comprised over 70 % of all individuals. Temporal and spatial variability at several scales were important aspects of the structure of this fish assemblage. Fishes were most abundant seasonally during spring, summer, and fall (2,659) and least abundant during winter (6). Small scale spatial variability was found on beaches adjacent to the jetties at Sebastian Inlet. Both total number of …

Genesis Of Marine Terrace Soils, Barbados, West Indies: Evidence From Mineralogy And Geochemistry, Daniel R. Muhs, Russell C. Crittenden, John N. Rosholt, Charles A. Bush, Kathleen C. Stewart

United States Geological Survey: Staff Publications

Well-developed, clay-rich soils dominated by interstratified kaolinite-smectite are found on the uplifted coral reef terraces on the island of Barbados. The reef limestone is unlikely to have been the soil parent material however, because it is 98 per cent CaCO, and geomorphic evidence argues against the 20 m of reef solution required to produce the soils by this process. The mineralogy of the sand, silt, and clay fractions of the soils, and trace element geochemistry, suggest that aeolian materials carried on the trade winds from Africa, volcanic ash from the island of St. Vincent, and quartz from Tertiary bedrock on …

Spatial And Temporal Characteristics Of Surface Air Temperature For Portland, Oregon, Li-Min Yang

Dissertations and Theses

This study examines the spatial and temporal characteristics of the surface air temperature in Portland, Oregon. Spatial temperature patterns indicate that the dominant control factors on seasonal temperature distribution are local topography, elevation, and urban-rural differences in surface structure. A heat island exists in the Portland area; the intensity of the heat island rang€s from 4° to 10° F, and varies throughout the year. The strongest heat island is found in the July minimum temperature. Temperature distribution in Portland and the adjacent area is affected by winds and rainy conditions, but less influenced under overcast skies. The long-term temperature over …

Is Growth Of Eelgrass Nitrogen Limited? A Numerical Simulation Of The Effects Of Light And Nitrogen On The Growth Dynamics Of Zostera Marina, Richard C. Zimmerman, Robert D. Smith, Randall S. Alberte

OES Faculty Publications

A numerical model of nitrogen uptake and growth was developed for the temperate seagrass Zostera marina L. Goals were to evaluate the relative effects of light and nitrogen availability on nitrogen uptake and partitioning between leaf and root tissue, and to estimate nitrogen concentrations in the sedment and water column required to saturate growth. Steady-state predictions are quite robust with respect to a range of parameter values justified by available data The calculations indicated that roots are probably more important in overall nitrogen acquisition in most light and nitrogen environments encountered in situ, but may contribute less than 50 …

Spatial And Temporal Variation Of Snow Accumulation In The Central Karakoram, Northern Pakistan, Cameron Parker Wake

Theses and Dissertations (Comprehensive)

Runoff from the Upper Indus Basin depends upon snowfall at high elevations in the northern mountains of Pakistan. However, very little is known concerning the amount of snowfall in the major source area, the high Karakoram, or its spatial and temporal distribution. Glaciers contain well preserved records of snow accumulation and provide a unique tool for retrieving data. A number of studies on temperate and tropical glaciers indicate that variations in chemical content and microparticle concentrations delineates seasonal stratigraphy. In addition, the chemical record of the snowpack can usually be used to determine the source of precipitation. Field work in …