Search Results

You are looking at 71 - 80 of 1,547 items for :

  • Journal of Applied Meteorology and Climatology x
  • Refine by Access: All Content x
Clear All
Jason Schatz and Christopher J. Kucharik

-likelihood values in all cases compared to models lacking an autoregressive term. Models first were run at monthly intervals to explore seasonal differences (not shown), which revealed two distinct seasons for model relationships roughly corresponding to the warmest and coldest parts of the year. We defined the cold season ( n = 98 days; from 15 December 2012 to 22 March 2013) as periods with widespread snow cover. We defined the warm season ( n = 294 days; from 27 April to 1 October 2012 and from 18 May to

Full access
H. A. R. De Bruin and H. R. A. Wessels

, such as lakes or canals, depends primarily on meteorological parameten like temperatureand humidity of the air, windspced and radiation balance. The morn complicated ice formation in rapidlyflowing riven is not considered in this study. A model is described that simulates ice growth and meltin~ utilizingobserved or forecast wcathcr data. The model includes situations with a snow cover. Special attention is givento the optimal estimation of the net redlation and to the role of the stability of the

Full access
Bo-Cai Gao, Wei Han, Si Chee Tsay, and North F. Larsen

regions during the daytime simpler than with current satellite data since these satellites have only a few discrete channels. The experimental data The ARMCAS field campaign was deployed in the Arctic tundra region surrounding Prudhoe Bay, Alaska, and the snow- and ice-covered Beaufort Sea during 1–15 June 1995. The main goal of this experiment was to improve our understanding of the mechanisms in cloud microphysics, radiation, and remote sensing in the Arctic. The experiment includes satellite remote

Full access
P. Krishna Rao and Jay S. Winston

the 8-13 micron water-vapor "window" made byTIROS II are studied in relation to conventionally observed information on pressure systems, cloudinessand temperature. These cases demonstrate further the synoptic capabilities, as well as some of the limitations, of these data for cloud detection; determination of cloud-top height; and observation of spatial gradients and temporal changes in the temperature of water-, land-, and snow-covered surfaces.1. Introduction Radiation measurements from

Full access
Donald G. Baker and David L. Ruschy

,alfalfa, soybeans, and green peas) for a combined total of 5778 days between 2 i November 1969-31 December1985. Statistical summaries of the calculated mean daily albedos of all surfaces are shown for months, seasonsand years. There are, in effect, three albedo seasons:, the high albedo season with snow cover (DecemberFebruary), the low albedo scasnn (April-October), and transitions between the two that occur in March andNovember. The least variation was associated with the low albedo season., increasing from a

Full access
Wayne R. Rouse

for adjacent snow-freeland and ice-covered sea surfaces along the Hudson Bay coastline indicate that multiple reflection enhancementcan be large over high-aibedo surfaces in the presence of cloud. The type and thickness of cloud is the majorfactor determining the magnitude of multiple reflection, and there is a wide range in cloud base albedos. When,under cloudy skies, the global solar radiation equals the mngnitude for clear sides, it is due to the fact that theclouds are thin and largely

Full access
J. D. Bergen, B. A. Hutchison, R. T. McMillen, A. D. Ozment, and G. J. Gottfried

Diffusion Laboratory, NOAA Oak Ridge, TN 37830. A. D. OZMENT AND G. J. GOTTFRIEDRocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Tempe, AZ 85281.(Manuscript received 28 May 1982, in final form 2 September 1982) ABSTRACT The integrated albedo for solar radiation in the 0.4-0.7 #m wavelength range was measured near noonover a wet snow cover before and after a new snowfall. Observed values were compared with those

Full access
Isidore Halberstam and John P. Schieldge

MARCH 1981 ISIDORE HALBERSTAM AND JOHN P. SCHIELDGE 255Anomalous Behavior of the Atmospheric Surface Layer over a Melting Snowpack ISIDORE HALBERSTAM1 AND JOHN P. SCHIELDGEJet Propulsion Laboratory, Pasadena, CA 91103(Manuscript received 16 June 1980, in final form 13 October 1980)ABSTRACT During March, 1978 on a snow-covered field near Lee Vining, California, measurements were made thatincluded: 1) variations

Full access
Thomas W. Jurik and David M. Gates

percent coverage of ground surface with live vegetation up to 35% cover,with little further change in albedo with cover, up to the maximum oberved value of 70%. The ratio at midday of albedo in visible wavelengths (400-700 nm) to total shortwave albedo decreasedfrom 0.49 in mid-May 1982 to a minimum of 0.22 in mid-July and then increased to 0.45 in mid-October,after leaf-fall. Midday shortwave albedo during winter varied from 91% over fresh snow to 76% over old, compacted snow.1. Introduction

Full access
Keith P. Shine, David A. Robinson, Ann Henderson-Sellers, and George Kukla

over the Arctic Oceanduring the late spring from analyses of DefenseMeteorological Satellite Program (DMSP) shortwaveimagery for cloudless skies. With additional in situ© 1984 American Meteorological Society1460JOURNAL OF CLIMATE AND APPLIED METEOROLOGYVOLUME 2315 MAY 19799 0°W9 0°E0°FIG. 1. DMSP image for 15 May 1979 in the region of the Canadian Arcticshowing the contrast between polynyas/leads and snow covered ice/land surfaces.atmospheric calibration, the method described

Full access