Search Results

You are looking at 1 - 10 of 1,375 items for :

  • Decadal variability x
  • Monthly Weather Review x
  • All content x
Clear All
Ruiqiang Ding and Jianping Li

interannual variability of persistence has also been explored. A considerable intraseasonal and interannual variability of persistence of the 500-mb (hPa) height field during the Northern Hemisphere winter was found in the study of Horel (1985a) . The persistence of daily 500-mb geopotential height anomalies over the central Pacific as a region with frequent blocking activity is found to change obviously with the sign and magnitude of height anomalies ( Horel 1985b ). In recent decades, obvious changes

Full access
Arun Kumar and Caihong Wen

1. Introduction Pacific decadal oscillation (PDO) is one of the dominant modes of sea surface temperature (SST) variability in the North Pacific and has been associated with various biological and physical aspects of variability over this region ( Mantua et al. 1997 ; Liu 2012 ; Newman et al. 2016 ). Traditionally PDO has been defined based on the variability associated with SSTs ( Mantua et al. 1997 ; Wen et al. 2014 ). Although having a component of variability on a decadal time scale that

Full access
David Changnon, Chad Merinsky, and Michael Lawson

spatial variability issues and atmospheric conditions associated with climate extremes. 2. Data and methods An intensive study identified approximately 1150 first-order and cooperative National Weather Service (NWS) stations located east of the Rockies with good quality snowfall records during the 51-yr period 1950–2000 ( Changnon et al. 2006 ). Although these stations were not equally spaced, on average there was one for each 1000 km 2 . For each site, a list of dates through the 50 yr when the 1- or

Full access
Vladimir M. Krasnopolsky, Michael S. Fox-Rabinovitz, and Alexei A. Belochitski

section 2 , the NN approach and developed NN emulations for NCAR CAM LWR and SWR are briefly described in terms of their design, accuracy, and computational performance. In section 3 , the results of the two parallel decadal model simulations, one using the combined LWR and SWR NN emulations for full model radiation and the other using the original model radiation (the control) are compared in terms of closeness of their spatial and temporal variability characteristics. Section 4 contains the

Full access
Daniel L. Cadet and Bradley C. Diehl

VOLUME 112 MONTHLY WEATHER REVIEW OCTOBER 1984Interannual Variability of Surface Fields over the Indian Ocean during Recent Decades DANIEL L. CADET AND BRADLEY C. DIEHLDepartment of Meteorology, Florida State University, Tallahassee, FL 32306(Manuscript received 9 March 1984, in final form 30 July 1984)ABSTRACT The intemnnual variability of surface meteorological fields over the Indian

Full access
James A. Carton and Benjamin S. Giese

content anomaly signal averaged into three latitudinal bands 60°–15°S, 15°S–15°N, and 15°–60°N surrounding the globe (following Ishii et al. 2006 ), shown in Fig. 12 . The northern band shows the most rapid rise in temperature over the 42-yr period. This rise is evident in the eastern Pacific as well as the western Atlantic (as shown in Fig. 11 ). The gradual warming in the time series suggests that they may be roughly represented by a linear trend underlying the decadal variability discussed above

Full access
Thomas M. Hamill and George N. Kiladis

al. 2010 ; Figs. 2 – 3 ). Figure 3 above also shows that blocking onset and cessation were somewhat less well forecast than the overall forecasts of blocking. The skill curves for onset and cessation were noisier because of the greatly reduced sample size, even with 28 winter seasons of data. Figure 4 shows that there was a substantial amount of variability in the skill of blocking when the data were sorted by half-decadal periods, plus 2010–12. In the Pacific sector, the blocking skill in

Full access
V. M. Krasnopolsky, M. S. Fox-Rabinovitz, Y. T. Hou, S. J. Lord, and A. A. Belochitski

of model radiation. 4. Validation of parallel decadal model simulations and seasonal predictions In this section we present comparisons between two parallel 17-yr NCEP CFS model runs: one using the original LWR and SWR parameterizations (the control run) and one using their NN emulations. Also, the differences between parallel runs are compared with the model’s internal variability. Both spatial and temporal characteristics of prognostic and diagnostic fields are compared for the parallel runs. a

Full access
S. Zhang and A. Rosati

SSH errors. d. Trends and decadal variability of basin-scale heat content and salinity From the time series of the temperature and salinity anomalies over the upper 4 km of the ocean in CTL (CM2.1) and TRUTH (CM2.0) (both with respect to the TRUTH’s climatology), it is observed that both models show a roughly 0.002°C yr −1 warming trend in the World Ocean and they exhibit a roughly −0.32°C (CM2.1–CM2.0) bias with respect to each other ( Fig. 14 ). The Atlantic and Indian Oceans are the major

Full access
P. Grady Dixon, Gregory B. Goodrich, and William H. Cooke

, if any, on forest fires across the normally humid Southeast. Western wildfires have been shown to be increasing over the last few decades and much research implies that these trends will continue ( Covington 2000 ; Pierce et al. 2004 ; Westerling et al. 2006 ). Much of the research on western United States forest fires has focused on fire-suppressing land-use changes rather than climatic effects ( Westerling et al. 2006 ). However, Westerling et al. (2006) argue that climate variability is

Full access