Utilization of satellite radiative imagery data for improvement in the analysis of divergent wind in the tropics

Kasahara, Akira; Balgovind, Ramesh C.; Katz, Bert B.

i

Utilization of satellite radiative imagery data for improvement in the analysis of divergent wind in the tropics

1986
By Kasahara, Akira ; Balgovind, Ramesh C. ; Katz, Bert B.
Series: Office note (National Centers for Environmental Prediction (U.S.)) 325

Details

Personal Author:

Kasahara, Akira ; Balgovind, Ramesh C. ; Katz, Bert B.
Corporate Authors:

National Meteorological Center (U.S.)
NOAA Program & Office:

NWS (National Weather Service) ; NCEP (National Centers for Environmental Prediction)
Description:

A scheme is proposed to incorporate satellite radiative imagery data into the specification of initial conditions for the NMC operational global prediction model in order to improve the analysis of divergent wind field in the tropics. The basic assumptions are that outgoing longwave radiation (OLR) data can provide (1) the division between convective (upward motion) and clear sky (downward motion) areas, and (2) the height of convection cells. The intensity of ascending motion in the convective areas is estimated based on OLR data. The intensity of descending motion is evaluated from the thermodynamic energy balance between radiative cooling and adiabatic warming, since the local time change of temperature is small in the tropics. Once the vertical motion field is determined, the horizontal divergence field can be calculated from the mass continuity equation. Then, the divergent part of wind is determined. The proposed scheme is tested using the NMC analysis data set of January 21, 1985, with satisfactory results.
Content Notes:

Akira Kasahara, Ramesh C. Balgovinf, Bert B. Katz.

"December 1986."

"This is an unreviewed manuscript, primarily intended for informal exchange of information among NMC staff members."

System requirements: Adobe Acrobat Reader.

Includes bibliographical references (pages 23-25).
Keywords:

Long-range Weather Forecasting Mathematical Models Numerical Weather Forecasting Satellite Meteorology Weather Forecasting Long-range Weather Forecasting Mathematical Models Numerical Weather Forecasting Satellite Meteorology Weather Forecasting
Series:

Office note (National Centers for Environmental Prediction (U.S.)) 325
Document Type:

Office Note
Place as Subject:

United States
Rights Information:

Public Domain
Compliance:

Library
Main Document Checksum:

urn:sha256:e9d9db38c5f3cba3b072a00b5704687492f149dfae042adeb5401f61ab34efb6
Download URL:

https://repository.library.noaa.gov/view/noaa/11486/noaa_11486_DS1.pdf
File Type:

[PDF - 2.99 MB ]

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