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Experiments have been conducted with a regional climate model to indicate the conditions required to generate preferred regions of frontal activity in the Alaskan region. Several objective methods of frontal identification were first investigated. It was found that· the vertical component of relative vorticity,· a thermal front parameter -&nablaB;|&nablaB;Tsub 850] | · n, where Tsub 850] is the 850-hPa temperature and n is a unit vector in the direction of the 850-hPa temperature gradient, and· a parameter derived from the Q vector as a measure of vertical motionwere useful in combination to determine the occurrence of fronts. The preferred locations for frontal activity were located to the southern side of the...
Summary Daily and multi-day extreme precipitation events can cause important flooding. Assessment of the future evolution of heavy precipitation is therefore crucial in a context of climate change. Simulation results for Canada from the Canadian Global Climate Model (CGCM3) have been analyzed for 1 to 5-day annual maximum (AM) precipitation events over the 1850–2100 period using simulation series from five ensemble members. Trend analysis showed that daily and multi-day intense precipitation series were stationary over the 1850–1980 period while trends emerged during the period 1980–2005. Probabilities of occurrence of AM precipitation for the various months were also estimated. For the historical climate (1850–1980),...
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The Central Alaska Network is part of the National Park Service Inventory and Monitoring Program. It is composed of three national park units: Wrangell-St. Elias National Park and Preserve, Denali National Park and Preserve, and Yukon-Charley Rivers National Preserve. The Inventory and Monitoring Program is the result of the National Parks Omnibus Management Act, which was passed by Congress in1998. This act directs the National Park Service “to establish baseline [resource] information and to provide information on the long-term trends in the condition of National Park System resources.” The primary goal of the Central Alaska Network is to build a holistic picture of change across the ecosystems of the network...
The characteristics of spatiotemporal distribution of total ozone have a significant impact on the variabilities of climate and environment. As the increase of the high quality and quantity of total ozone datasets, it is necessary to provide a detailed investigation of spatiotemporal distribution characteristics of total ozone and its relationship with climate variability. Based on the ECMWF global monthly mean total ozone and stratopheric temperature data from 1979 to 2013, the spatiotemporal structure of dominant total ozone pattern in the Northern Hemisphere (north of 20°N) during boreal winter is studied using the rotated empirical orthogonal function (REOF) analysis and Morlet wavelet analysis. Besides, the...
[...]building a record of homogeneous historical climate information from such data has necessitated in-depth statistically and physically based corrections of the temperature record after the fact. [...]we are indebted to the time and efforts of the BAMS editor, Art DeGaetano, and the three anonymous reviewers of the paper for helping to improve the overall content, tone, and quality of the paper.
Using maximum latewood density data from a network of coniferous trees, annually resolved series of average summer half-year (April?September) temperatures have been reconstructed for three regions of North America: Alaska and the Yukon (ALAYUK), the Mackenzie valley (MACKVA), and Quebec and Labrador (QUEBLA). The reconstructions primarily express temperature variability on interannual-to-decadal timescales and extend over the period from AD 1760. These reconstructions represent an extension of the mean climate history for these regions of over 100 years. The ALAYUK series shows relatively wann summers dominating the 1770s and 1820s. The 1760s, 1810s, 1860s, and 1890s were cold; 1810 was the coldest summer over...
To quantify its wind energy potential the wind climate of the mountainous Yukon has been examined through data analysis and numerical modelling. Using many surface climate stations and radiosondes it was determined that the region's atmosphere is generally stably stratified, causing air to flow horizontally around mountain obstacles. The mesoscale model MC2, a non-hydrostatic and compressible model, has been used to simulate the mean wind climate of the steep mountainous Yukon with the intent to produce a reliable wind energy map. Early results of full scale simulations initialized with the standard NCEP/NCAR Reanalysis provided erroneous results for wind speeds and directions when compared to measurements. A detailed...
map background search result map search result map Climate Data Analysis of Existing Weather Stations in around the Central Alaska Network: Including Denali National Park and Preserve, Wrangell-St. Elias National Park and Preserve, and Yukon-Charley Rivers National Preserve.  Water balance dynamics of three small catchments in a sub-arctic boreal forest Climate and snowpack monitoring progress report 2011: Arctic Network The Alaskan Arctic Frontal Zone: Forcing by Orography, Coastal Contrast, and the Boreal Forest The Influence of the Pacific Decadal Oscillation on Annual Floods in the Rivers of Western Canada Water balance dynamics of three small catchments in a sub-arctic boreal forest Climate and snowpack monitoring progress report 2011: Arctic Network Climate Data Analysis of Existing Weather Stations in around the Central Alaska Network: Including Denali National Park and Preserve, Wrangell-St. Elias National Park and Preserve, and Yukon-Charley Rivers National Preserve.  The Alaskan Arctic Frontal Zone: Forcing by Orography, Coastal Contrast, and the Boreal Forest The Influence of the Pacific Decadal Oscillation on Annual Floods in the Rivers of Western Canada