12,771 research outputs found
Hydrogeochemistry of the Caribou-Poker Creeks Research Watershed
Bedrock of the Caribou-Poker Creeks Research Watershed dissolves incongruently
with a first-order rate constant of about 5 x 10-6 day-1 at 5° C. The
resulting solution is potassium-calcium-magnesium rich. The soil-plant environment
acts on this solution through sorption of potassium and by evapotranspiration
to yield a solution that is relatively depleted in potassium and
enriched in calcium and magnesium, but with the same molar ratio of Ca:Mg as
the fluid from the rock dissolution. This fluid from the soil-plant reservoir
is the dominant contributor of ions to stream waters.
Using the discriminant functions obtained by multiple discriminant
analysis
DPKR = 0.572Si02 + 0.240Ca + 2.89Mg - 0.384Na + 0.452N03 - 9.18
DCRB = 0.913Si02 + 0.042Ca + 1.28Mg + 1.17Na + 4.63N03 - 7.27,
the waters of Caribou Creek and Poker Creek can be distinguished on the basis
of chemical composition. In general, Poker Creek waters are slightly more
concentrated than Caribou Creek waters.
On the average, 1.4 x 10^13g H20/year leaves the watershed as surface
water. At an average calcium concentration of 14 ppm for the water, 0.1% for
the bedrock, and a watershed area of 46 mi^2, this flow corresponds to a maximum
loss of about 17 metric tons of rock per hectare per year
The North Wyke Farm Platform: Fine Resolution (15-minute) Meteorological Data
The North Wyke Farm Platform (NWFP) was established in 2010 to study and improve grassland livestock production at the farm-scale. The NWFP uses a combination of environmental sensors, routine field and lab-based measurements, and detailed management records to monitor livestock and crop production, emissions to water, emissions to air, soil health, and biodiversity. The rich NWFP datasets help researchers to evaluate the effectiveness of different grassland (and arable) farming systems, which in turn, contributes to the development of sustainable, resilient and net zero land management strategies. This document serves as a user guide to the meteorological data (MET) captured at a 15-minute temporal resolution from the North Wyke Farm Platform (NWFP). The guide gives details of the instrumentation, sensor calibration and data collection and is associated with other dedicated user guides that detail the design, establishment and development of the NWFP, and the quality control process of datasets
The North Wyke Farm Platform: Field Events Data
The North Wyke Farm Platform (NWFP) was established in 2010 to study and improve grassland livestock production at the farm-scale. The NWFP uses a combination of environmental sensors, routine field and lab-based measurements, and detailed management records to monitor livestock and crop production, emissions to water, emissions to air, soil health, and biodiversity. The rich NWFP datasets help researchers to evaluate the effectiveness of different grassland (and arable) farming systems, which in turn, contributes to the development of sustainable, resilient and net zero land management strategies. This document serves as a user guide to the field events and common field operations that occur on the NWFP and is associated with other dedicated user guides that detail the collection, and quality control processing of all the datasets produced on the NWFP
The North Wyke Farm Platform: Fine Resolution (15-minute) Soil Moisture Station Data
The North Wyke Farm Platform (NWFP) was established in 2010 to study and improve grassland livestock production at the farm-scale. The NWFP uses a combination of environmental sensors, routine field and lab-based measurements, and detailed management records to monitor livestock and crop production, emissions to water, emissions to air, soil health, and biodiversity. The rich NWFP datasets help researchers to evaluate the effectiveness of different grassland (and arable) farming systems, which in turn, contributes to the development of sustainable, resilient and net zero land management strategies. This document serves as a user guide to the soil moisture station (SMS) data (soil moisture and soil temperature sensors, rain gauge for precipitation) captured at a 15-minute temporal resolution. The guide gives details of the instrumentation, sensor calibration and data collection and is associated with other dedicated user guides that detail the design, establishment and development of the NWFP, field events, and the quality control process of datasets
Erupting Dwarf Novae in the Large Magellanic Cloud
We report the first likely detections of erupting Dwarf Novae (DN) in an
external galaxy: the Large Magellanic Cloud. Six candidates were isolated from
approximately a million stars observed every second night over 11 nights with
the CTIO 8K x 8K Mosaic2 CCD imager. Artificial dwarf nova and completeness
tests suggest that we are seeing only the brightest of the LMC DN, probably SS
Cygni-like CVs, but possibly SU UMa-type cataclysmics undergoing
superoutbursts. We derive crude but useful limits on the LMC DN surface
density, and on the number of DN in the LMC. Many thousands of cataclysmic
variables in the Magellanic Clouds can be discovered and characterized with 8
meter class telescopes.Comment: Accepted for publication in AJ, 28 pages, 9 figures total, Figures 1
and 8 are supplied separately in jpeg forma
The North Wyke Farm Platform: Fine Resolution (15-Minute) Hydrology and Water Quality Data
The North Wyke Farm Platform (NWFP) was established in 2010 to study and improve grassland livestock production at the farm-scale. The NWFP uses a combination of environmental sensors, routine field and lab-based measurements, and detailed management records to monitor livestock and crop production, emissions to water, emissions to air, soil health, and biodiversity. The rich NWFP datasets help researchers to evaluate the effectiveness of different grassland (and arable) farming systems, which in turn, contributes to the development of sustainable, resilient and net zero land management strategies. This document serves as a user guide to the hydrology and water quality data collected at a 15-minute temporal resolution from the NWFP. The guide gives details of the instrumentation, sensor calibration and data collection and is associated with other dedicated user guides that detail the design, establishment and development of the NWFP, field events, and the quality control process of datasets
The North Wyke Farm Platform: Livestock Data
The North Wyke Farm Platform (NWFP) was established in 2010 to study and improve grassland livestock production at the farm-scale. The NWFP uses a combination of environmental sensors, routine field and lab-based measurements, and detailed management records to monitor livestock and crop production, emissions to water, emissions to air, soil health, and biodiversity. The rich NWFP datasets help researchers to evaluate the effectiveness of different grassland (and arable) farming systems, which in turn, contributes to the development of sustainable, resilient and net zero land management strategies. This document serves as a user guide to the collection and management of livestock data and is associated with other dedicated user guides that detail the design, establishment and development of the NWFP, and field events
Development of a helium atmosphere soil incubation technique for direct measurement of nitrous oxide and dinitrogen fluxes during denitrification
The North Wyke Farm Platform: Quality Control System (Data version 3; released on 01-12-2018)
The North Wyke Farm Platform (NWFP) was established in 2010 to study and improve grassland livestock production at the farm-scale. The NWFP uses a combination of environmental sensors, routine field and lab-based measurements, and detailed management records to monitor livestock and crop production, emissions to water, emissions to air, soil health, and biodiversity. The rich NWFP datasets help researchers to evaluate the effectiveness of different grassland (and arable) farming systems, which in turn, contributes to the development of sustainable, resilient and net zero land management strategies. This document serves as a user guide to the quality control (QC) system of the water run-off, water chemistry, soil moisture and meteorological data produced at a 15-minute temporal resolution on the North Wyke Farm Platform (NWFP). The guide gives limits and thresholds for the instrumentation, and the QC flags applied to each data point. Also included are information on the QC process for the latest data version and changes since the previous version. This document is associated with other dedicated user guides that detail the collection of other dataset types produced on the NWFP
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