TITLE

Development and Verification of Daily Gridded climate Surfaces in the Okanagan Basin of British Columbia

AUTHOR(S)
Neilsen, Denise; Duke, Guy; Taylor, Bill; Byrne, Jim; Kienzle, Stefan; Gulik, Ted Van der
PUB. DATE
June 2010
SOURCE
Canadian Water Resources Journal / Revue Canadienne des Ressourc;Summer2010, Vol. 35 Issue 2, p131
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Gridded estimates of daily minimum and maximum temperature and precipitation from 1960 to 2005 were prepared for the Okanagan Basin of British Columbia. The procedure utilized available daily climate data from 182 stations and employed a regression based interpolation scheme at 500 metre grid spacing. Spatial distribution of temperature took into account variations in temperature with elevation, an observed north-south temperature gradient, and proximity to several large lakes in the valley bottom. An inverse distance weighting scheme was used for the interpolation, and a constrained lapse rate approach was used to interpolate in areas that lie above the highest climate station. Temperature inversions were handled by fitting a second order polynomial and introducing a two-layer model. The precipitation routine differs from the temperature model in that the regressions were based on monthly precipitation totals, thus producing daily precipitation surfaces that incorporate an orographic component along with latitudinal trends. A �leave one out� cross-validation procedure was applied to 56 stations to test model performance. Cross-validation of the predicted surfaces indicated that, on average, the daily maximum temperature surfaces were more accurate than the daily minimum temperature surfaces. Mean Absolute Error (MAE) averaged 1.0�C for maximum temperature while for minimum temperature MAE was in the range of 1.3�C to 1.8�C depending on the season. Errors in both temperature and precipitation surfaces are largest at higher elevations where station density is low. Over all stations, monthly MAE for precipitation averaged between 10% and 18%. A MAE calculated from differences between observed and predicted annual precipitation over all stations was 27 mm with a percent error of 6.2%. The model shows a positive bias (1.4) in the daily occurrence of precipitation resulting in an over-prediction of days with drizzle. Over 80% of incorrectly predicted wet days had less than 1 mm precipitation. These error statistics compare favourably to those from similar regression-based interpolation models.
ACCESSION #
53397769

 

Related Articles

  • Factors controlling Slope Environmental Lapse Rate (SELR) of temperature in the monsoon and cold-arid glacio-hydrological regimes of the Himalaya. Thayyen, R. J.; Dimri, A. P. // Cryosphere Discussions;2014, Vol. 8 Issue 6, p5645 

    Moisture, temperature and precipitation interplay forced through the orographic processes sustains the Himalayan cryospheric system. However, factors controlling the Slope Environmental Lapse Rate (SELR) of temperature along the higher Himalayan mountain slopes across various glacio-hydrologic...

  • A Gauge-Based Analysis of Daily Precipitation over East Asia. Pingping Xie; Yatagai, Akiyo; Mingyue Chen; Hayasaka, Tadahiro; Fukushima, Yoshihiro; Changming Liu; Yang, Song // Journal of Hydrometeorology;Jun2007, Vol. 8 Issue 3, p607 

    A new gauge-based analysis of daily precipitation has been constructed on a 0.5° latitude–longitude grid over East Asia (5°–60°N, 65°–155°E) for a 26-yr period from 1978 to 2003 using gauge observations at over 2200 stations collected from several individual...

  • Orographic Precipitation and Oregon’s Climate Transition. Smith, Ronald B.; Barstad, Idar; Bonneau, Laurent // Journal of the Atmospheric Sciences;1/1/2005, Vol. 62 Issue 1, p177 

    Oregon’s sharp east–west climate transition was investigated using a linear model of orographic precipitation and four datasets: (a) interpolated annual rain gauge data, (b) satellite-derived precipitation proxies (vegetation and brightness temperature), (c) streamflow data for a...

  • Parametric versus non-parametric estimates of climatic trends. Huth, R.; Pokorn�, L. // Theoretical & Applied Climatology;2004, Vol. 77 Issue 1/2, p107 

    Summary Two methods of estimation of the trend magnitude are compared: the parametric one (least-squares regression) with the non-parametric one (median of pairwise slopes). The comparison is carried out for seasonal and annual trends of ten climatic variables at a network of stations in the...

  • An Analytical Formula for Potential Water Vapor in an Atmosphere of Constant Lapse Rate. Varmaghani, Ali // Terrestrial, Atmospheric & Oceanic Sciences;Feb2012, Vol. 23 Issue 1, p17 

    Accurate calculation of precipitable water vapor (PWV) in the atmosphere has always been a matter of importance for meteorologists. Potential water vapor (POWV) or maximum precipitable water vapor can be an appropriate base for estimation of probable maximum precipitation (PMP) in an area,...

  • On the Dependence of Winter Precipitation Types on Temperature, Precipitation Rate, and Associated Features. Thériault, Julie M.; Stewart, Ronald E.; Henson, William // Journal of Applied Meteorology & Climatology;Jul2010, Vol. 49 Issue 7, p1429 

    The phase of precipitation formed within the atmosphere is highly dependent on the vertical temperature profile through which it falls. In particular, several precipitation types can form in an environment with a melting layer aloft and a refreezing layer below. These precipitation types include...

  • Can Anthropogenic Aerosols Decrease the Snowfall Rate? Lohmann, U. // Journal of the Atmospheric Sciences;10/15/2004, Vol. 61 Issue 20, p2457 

    Observations by Borys, Lowenthal, Cohn, and Brown in midlatitude orographic clouds show that for a given supercooled liquid water content, both the riming and the snowfall rates are smaller if the supercooled cloud has more cloud droplets as, for example, caused by anthropogenic aerosols. The...

  • Strong Cross-Barrier Flow under Stable Conditions Producing Intense Winter Orographic Precipitation: A Case Study over the Subtropical Central Andes. Viale, Maximiliano; Norte, Federico A. // Weather & Forecasting;Aug2009, Vol. 24 Issue 4, p1009 

    The most intense orographic precipitation event over the subtropical central Andes (36°–30°S) during winter 2005 was examined using observational data and a regional model simulation. The Eta-Programa Regional de Meteorología (PRM) model forecast was evaluated and used to explore...

  • OROGRAPHIC PRECIPITATION IN THE TROPICS. SMITH, RONALD B.; MINDER, JUSTIN R.; NUGENT, ALISON D.; STORELVMO, TRUDE; KIRSHBAUM, DANIEL J.; WARREN, ROBERT; LAREAU, NEIL; PALANY, PHILIPPE; JAMES, ARLINGTON; FRENCH, JEFFREY // Bulletin of the American Meteorological Society;Oct2012, Vol. 93 Issue 10, p1567 

    The Dominica Experiment (DOMEX) took place in the eastern Caribbean from 4 April to 10 May 2011 with 21 research flights of the Wyoming King Air and several other observing systems. The goal was an improved understanding of the physics of convective orographic precipitation in the tropics. Two...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics