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1,705 results for “1988”
Chronic Nitrogen Amendment Experiment at Harvard Forest since 1988
The purpose of this study is to increase our understanding of ecosystem nitrogen dynamics in response to elevated nitrogen inputs. With atmospheric nitrogen deposition in the Northeastern United States currently at 10 to 20 times above historic background levels, it is possible that excessive nitrogen inputs could saturate the retention capacity of a forest ecosystem. Potential effects of nitrogen saturation include increased nitrate leaching and simultaneous base cation losses, soil acidification, altered fluxes of trace gases and forest decline. Two adjacent stands were chosen for the study: an even-aged red pine (Pinus resinosa Ait.) stand planted in 1926 and a 50-year-old mixed hardwood stand that had regenerated naturally after clearcutting in approximately 1945. The hardwood stand is dominated by black and red oak (Quercus velutina Lam.; Q. rubra L.) with significant amounts of black birch (Betula lenta L.), red maple (Acer rubrum L.) and American beech (Fagus grandifolia Ehrh.). The dominant soil types are stony- to sandy-loams formed from glacial till, and are classified as Typic Dystrochrepts of the Canton or Montauk series. Four treated plots were established within each stand: control, low N, low N plus sulfur (N+S) and high N. Each plot measures 30 x 30 meters (0.09 ha) and is divided into thirty-six 5 x 5 m subplots.
A multi-year DAILY weather file for the Toolik Field Station at Toolik Lake, Alaska starting 1988 to present.
A multi-year DAILY weather file for the Arctic Tundra Long-Term Ecological Research (LTER) site at Toolik Lake, AK. Included are daily averages and/or maximums and minimums of air, wind speed, soil temperature, and sum of global radiation and precipitation. In 2008 Toolik Field Station took over maintenance of the main weather station. See http://toolik.alaska.edu/edc/index.php for current weather data. In addition to the main weather station the Arctic LTER maintains several stations that collect data on the experimental plots.
Chlorophyll A, and primary productivity of Toolik lake , Arctic LTER 1975 to 1988, Toolik Field Station, Alaska.
Chlorophyll A, and primary productivity of Toolik lake 1975 - 1988. Water samples were taken weekly from Toolik lake. The sampling depths for the Control side were 0, 1, 3, 5, and 6 meters and the Treatment side were 0, 1, 3, 5, and 7 meters.
Cascade Project at North Temperate Lakes LTER cross-lakes comparison carbon Data 1988 - 2007
Data on dissolved organic and inorganic carbon as well as particulate organic matter and the partial pressure of CO2. Samples were collected with a Van Dorn bottle. Organic samples were collected from the epilimnion, metalimnion, and hypolimnion. Inorganic samples were collected at depths corresponding to 100%, 50%, 25%, 10%, 5%, and 1% of surface irradiance, as well as one sample from the hypolimnion. Samples for the partial pressure of CO2 were collected from two meters above the lake surface (air) and just below the lake surface (water).
Little Rock Lake Experiment at North Temperate Lakes LTER: Zooplankton length 1988 - 1998
The Little Rock Acidification Experiment was a joint project involving the USEPA (Duluth Lab), University of Minnesota-Twin Cities, University of Wisconsin-Superior, University of Wisconsin-Madison, and the Wisconsin Department of Natural Resources. Little Rock Lake is a bi-lobed lake in Vilas County, Wisconsin, USA. In 1983 the lake was divided in half by an impermeable curtain and from 1984-1989 the northern basin of the lake was acidified with sulfuric acid in three two-year stages. The target pHs for 1984-5, 1986-7, and 1988-9 were 5.7, 5.2, and 4.7, respectively. Starting in 1990 the lake was allowed to recover naturally with the curtain still in place. Data were collected through 2000. The main objective was to understand the population, community, and ecosystem responses to whole-lake acidification. Funding for this project was provided by the USEPA and NSF. Zooplankton samples are collected from the treatment and reference basins of Little Rock Lake at at two to nine depths using a 30L Schindler Patalas trap (53um mesh). Zooplankton samples are preserved in buffered formalin and archived. Data are summed over sex and stage and integrated volumetrically over the water column to provide a lake-wide estimate of average length of organisms for each species.
Proposições na Câmara dos Deputados de 1988 até 2022 classificadas por Tema
<p>Dados extraídos do <a href="https://dadosabertos.camara.leg.br/swagger/api.html#staticfile">Portal de Dados Abertos da Câmara dos Deputados</a> e processados para correlacionar as proposições com seus respectivos temas.</p> <p>Cada linha do dataset corresponde a uma Proposição apresentada na Câmara dos Deputados, com informações sobre sua identificação, conteúdo e andamento no processo legislativo, além da classificação temática. Com essa estrutura, seria possível realizar análises e visualizações dos dados, identificando padrões, tendências e evolução de temas ao longo do tempo.</p>
City of Seattle, Seattle Public Utilities, Delta Plant Communities 1988-2007, Cedar River Municipal Watershed, King County, WA
Seattle Public Utilities manages the Cedar River Municipal Watershed and reservoir, Chester Morse Lake, to provide drinking water for 1.6 million residents in the greater Seattle area. The Cedar and Rex rivers are the two largest tributaries to Chester Morse Lake and flow over broad, low-gradient deltas. The deltas have mostly fine sediments, sinuous low-flow channels, and an extensive wetland complex with aquatic, herbaceous, shrub, and forest components. Delta plant communities were mapped in 1988, 1996, and 2007 using aerial photography. Plant communities were ground-truthed and boundaries and classification of polygons were corrected where errors were evident. Plant communities were classified into major structural classes, including herbaceous, shrub, deciduous forest, mixed deciduous/conifer forest, and conifer forest. A system of permanent plots was established on the Cedar and Rex river deltas and measured in 1988, 1996, and 2007. Transects comprised of sample plots every 25 meters were surveyed for herbaceous and shrub cover. An additional transect was established in the floodplain of the Cedar River through mixed deciduous and conifer forest to measure tree diameter at breast height and species. This package is complete, and the data were analyzed to evaluate the potential for future adverse impacts to delta plant communities resulting from changes to the reservoir operating regime.
Daily rainfall series and rainfall erosivity in Mexico for three climatic normals (1968-1997, 1978-2007, and 1988-2017)
As in many countries around the world, there are some issues in the Mexican rainfall series, such as missing values, short measurement periods, and series homogeneity (breaks due to station relocation and measurement mistakes), which further compound the challenge of using climate data. Furthermore, it is necessary to develop a complete and helpful rainfall series database by following an imputing and homogenization process of the rainfall series. This research has compiled and systematized a national dataset with daily rainfall and rainfall erosivity for three climatic normals CN (1968-1997, 1978-2007, and 1988-2017). We have used the "climatol" package to fill the data. After, we calculated daily rainfall erosivity using a power law model. As a result, we obtained 1370, 1679, and 1683 rainfall series for the CNs 1968-1997, 1978-2007, and 1988-2017, respectively. The median values of the rainfall erosivity for the three CNs were 3245, 3070, and 3327 MJ mm/ ha h yr, respectively. We are making this database available for public consultation for researchers and students, technical assistants, decision-makers, and others interested in environmental studies in Mexico.
Bonanza Creek LTER: Hourly Air Temperature Measurements (sample, min, max) at 50 cm and 150 cm from 1988 to Present in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
This dataset contains the hourly output from Vaisala HMP35 and HMP45 temperature sensors for the Bonanza Creek Experimental Forest (BCEF). Any temperature data collected in this area is reported here. This includes Level 3 weather stations as well as smaller scale and temporal studies. This data can be sorted and viewed by site, year, hour, height of measurement, mean, min, and max value. Updates of each site are different since some are still on going while other had only a 2-3 year life cycle. This information can be found in the site descriptions and in the metadata.
Bonanza Creek LTER: Hourly Photosynthetically Active Radiation (PAR) Measurements from 1988 to Present in the Bonanza Creek Experimental Forest and the Caribou-Poker Creeks Research Watershed near Fairbanks, Alaska
PAR sensors measure solar radiation in the 400 to 700 nm waveband in microEinsteins per sq. m. per second. The average hourly reading is converted to microEinsteins per sq. m. per hour and summed over 24 hours to obtain daily Einsteins per sq. m. Sensors are removed at the end of September for annual calibrations and replaced back at the sites by the first of May each year.
Bonanza Creek LTER: Hourly Snow Depth Measurements from 1988 to Present in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
Snow depth is measured hourly at both the LTER1 and LTER2 research stations within Bonanza Creek Experimental Forest using a Campbell Scientific data logger and a SR50 sonic snow depth sensor.
Bonanza Creek LTER: Hourly Wind Speed and Direction at Various Heights from 1988 to Present in the Caribou-Poker Creeks Research Watershed near Fairbanks, Alaska
Hourly wind data from sefveral sites with the the Caribou Poker Creeks Research Watershed. Wind data should be used cautiously during winter months due to ice and snow build up on sensors.
Bonanza Creek LTER: Hourly Evaporation measurements at Core Sites from 1988 to Present in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
This study is a survey of the vegetation of the 35 control sites in Bonanza Creek LTER. The 35 sites represent replicates each of six successional stages of primary succession on the floodplain of the Tanana River and four stages of succession uplandsas well as a few recently burned sites. Data include percent cover of all species and count based on twenty 1 m2 or 4 m2 plots. Plots in young stages of succession were remeasured every 1 to 2 years; those in older stages every 3 to 5 years. Some information on biomass in these stages is available. Although most sites were established in 1988 some sites have vegetation plots that have been sampled periodically since 1965. 2009 was the last year of sampling using visual estimates of percent cover. In 2007 a new point framing system was developed and is now used for collecting vegetation data from these sites.
Bonanza Creek LTER: Hourly Snow Pillow Measurements from 1988 to Present in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
The snow pillow records the hourly water content of the snowpack (snow water equivalent) at the LTER1 site within the Bonanza Creek Experimental Forest during the winter months.
Bonanza Creek LTER: Hourly Dew Point Measurements from 1988 to Present in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
Dew point values are calculated using the data from the air temperature and relative humidity sensors collected at the corresponding Bonanza Creek Long Term Ecological Research climate stations.
Bonanza Creek LTER: Hourly Pyranometer (PYR) Measurements from 1988 to Present in the Bonanza Creek Experimental Forest and the Caribou-Poker Creeks Research Watershed near Fairbanks, Alaska
The pyranometers measure the energy flux density of global sun plus sky radiation across a broad band from 280 to 2800 nm. The sensor consists of a silicon photodiode which does not have an equal spectral response across the band. However, this does not cause serious error for measurements of solar radiation, provided the spectral distribution is not altered, such as within plant canopies. Winter measurements may be inaccurate due to snow cover.
Bonanza Creek LTER: Hourly Vapor Pressure (VP) Measurements from 1988 to Present in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
Calculated vapor pressure values using the air temperature and relative humidity data collected at the corresponding Bonanza Creek climate station 150cm sensors.
Bonanza Creek LTER: Hourly Ultraviolet Radiation (UV) Measurements from 1988 to Present in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
In 1993, Eppley total UV radiometers (TUVR) were installed at each climate station on 21 April at LTER1 and 5 May at LTER2. These radiometers consist of a Weston selenium barrier-layer photoelectric cell with a sealed-in quartz window, a bandpass filter to restrict the wavelength response of the photcell to the designed range (295-385 nm), and a diffusing disc of Virgin Teflon to reduce the light intensity at the filtered photocell and also to improve the adherence of the instrument to the Lambert cosine law. The disc is nearly uniform diffusing over the wavelength range of interest, as well as geometrically within the system. The terminals of the photocell are connected through a precision resistor and the signal measured as a voltage drop across the resistor. Winter measurements may be inaccurate due to snow cover.
Bonanza Creek LTER: Hourly Precipitation Weighing Bucket Measurements from 1988 to Present in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
This data set includes year round precipitation values from LTER1 and LTER2. Sampling buckets are filled with antifreeze to melt and prevent snow build up. While these sensors work year round, tipping bucket data seems more accurate for snow free periods.
Bonanza Creek LTER: Hourly Wind Speed and Direction at 3m and 10 m from 1988 to Present in the Bonanza Creek Experimental Forest near Fairbanks, Alaska
This dataset contains the hourly output from Wind sensors for the Bonanza Creek Experimental Forest (BCEF). This includes Level 3 weather stations as well as smaller scale and temporal studies. This data can be sorted and viewed by site, year, hour, height of measurement, mean, min, and max value. Updates of each site are different since some are still on going while other had only a 2-3 year life cycle. Winter measurements may be inaccurate due to snow cover.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.