TITLE

Interpretation of Enhanced Integrated Water Vapor Bands Associated with Extratropical Cyclones: Their Formation and Connection to Tropical Moisture

AUTHOR(S)
Bao, J.-W.; Michelson, S. A.; Neiman, P. J.; Ralph, F. M.; Wilczak, J. M.
PUB. DATE
April 2006
SOURCE
Monthly Weather Review;Apr2006, Vol. 134 Issue 4, p1063
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Trajectory analysis using a weather prediction model is performed for five cases to interpret the formation of enhanced bands of vertically integrated water vapor (IWV) in the central and eastern Pacific that are frequently seen in satellite images from the Special Sensor Microwave Imager. The connection of these enhanced bands with poleward water vapor transport from the Tropics is also examined. It is shown that the leading end of the enhanced IWV bands (defined as the most eastward and poleward end) is the manifestation of moisture convergence in the warm conveyor belt associated with extratropical cyclones, while the bands away from the leading end result mainly from moisture convergence along the trailing cold fronts. There is evidence that some enhanced IWV bands may be associated with a direct poleward transport of tropical moisture along the IWV bands from the Tropics all the way to the extratropics. The trajectory analysis, together with the seasonal mean sea level pressure analysis, indicates that a favorable condition for the occurrence of a direct, along-IWV band transport of tropical (defined as south of 23.5°N) moisture to the U.S. West Coast in the eastern Pacific is a weakened subtropical ridge in the central Pacific with an enhanced southwesterly low-level flow. The authors hypothesize that the direct poleward transport of tropical moisture within an enhanced IWV band in the eastern Pacific is most possible in the neutral El Niño–Southern Oscillation (ENSO) phase and is least possible in the El Niño phase.
ACCESSION #
20583482

 

Related Articles

  • Atmospheric observations and numerical weather prediction. Schulze, G. C. // South African Journal of Science;Jul2007, Vol. 103 Issue 7/8, p318 

    Today's 72-hour weather forecast is as accurate, globally, as the 24-hour forecast of the 1980s. The recent improvement in accuracy, for the southern hemisphere in particular, is remarkable. This achievement came about through scientific understanding of dynamical and physical processes in the...

  • Water Vapor Fluxes over the Intra-Americas Sea: Seasonal and Interannual Variability and Associations with Rainfall. Mestas-Nuñez, Alberto M.; Enfield, David B.; Chidong Zhang // Journal of Climate;May2007, Vol. 20 Issue 9, p1910 

    The seasonal and interannual variability of moisture transports over the Intra-Americas Sea (including the Gulf of Mexico and the Caribbean Sea) is evaluated using the NCEP–NCAR global reanalysis. The seasonal variability of these moisture transports is consistent with previous studies...

  • Multidecadal signals in the interannual variability of atmospheric angular momentum. Rosen, R.D.; Salstein, D.A. // Climate Dynamics;Sep2000, Vol. 16 Issue 9, p693 

    To assess whether trends in the troposphere's circulation have occurred this century in concert with changes at the surface, we consider the low-frequency behavior in the global angular momentum of the atmosphere. Values of this index have been computed each month since 1870 from model...

  • The retrospective prediction of ENSO from 1881 to 2000 by a hybrid coupled model: (II) Interdecadal and decadal variations in predictability. Ziwang Deng; Youmin Tang // Climate Dynamics;Feb2009, Vol. 32 Issue 2/3, p415 

    In this study, the retrospective predictions of ENSO (El Niño and Southern Oscillation) were performed for the period from 1881 to 2000 using a hybrid coupled model, which is an ocean general circulation model coupled to a linear statistical atmospheric model, and using a newly developed...

  • AUTOMATIC IDENTIFICATION OF CLOUD COVER REGIONS USING SURF. Roomi, Mohamed Mansoor; Bhargavi, R.; Banu, T. M. Hajira Rahima // International Journal of Computer Science, Engineering & Informa;Apr2012, Vol. 2 Issue 2, p159 

    Weather forecasting has become an indispensable application to predict the state of the atmosphere for a future time based on cloud cover identification. But it generally needs the experience of a well-trained meteorologist. In this paper, a novel method is proposed for automatic cloud cover...

  • THE ENIAC FORECASTS. Lynch, Peter // Bulletin of the American Meteorological Society;Jan2008, Vol. 89 Issue 1, p45 

    The numerical forecasts made in 1950 using the Electronic Numerical Integrator and Computer (ENIAC) paved the way for the remarkable advances that have been made over the past half-century in weather prediction and climate modeling. We review the circumstances in which the forecasts were made,...

  • Climate Forecasts Likely Incorrect.  // USA Today Magazine;Aug2004, Vol. 133 Issue 2711, p6 

    Presents information on the findings of a study indicating inaccuracy on climate forecasts concerning temperature increases. Description of the positive water vapor feedback effect; Responsibility of science in climate predictions; Key debate of the size of the positive water vapor feedback...

  • The Interdecadal Pacific Oscillation and the Southern Oscillation Index: relative merits for anticipating inflows to the Upper Clutha lakes. Taylor, Malcolm; Bardsley, Earl // Journal of Hydrology (00221708);2015, Vol. 54 Issue 2, p67 

    Spring values of the Southern Oscillation Index (SOI) and the unfiltered Interdecadal Pacific Oscillation (IPO) are compared for anticipating summer inflows to the lakes of the upper Clutha River, New Zealand. Earlier work proposed the spring SOI to forecast summer inflows. However, more recent...

  • Did the ECMWF Seasonal Forecast Model Outperform Statistical ENSO Forecast Models over the Last 15 Years? Jan van Oldenborgh, Geert; Balmaseda, Magdalena A.; Ferranti, Laura; Stockdale, Timothy N.; Anderson, David L. T. // Journal of Climate;Aug2005, Vol. 18 Issue 16, p3240 

    The European Centre for Medium-Range Weather Forecasts (ECMWF) has made seasonal forecasts since 1997 with ensembles of a coupled ocean–atmosphere model, System-1 (S1). In January 2002, a new version, System-2 (S2), was introduced. For the calibration of these models, hindcasts have been...

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