Meteorology and Atmospheric Physics

, Volume 46, Issue 1–2, pp 29–40 | Cite as

The impact of geophysical parameters on longwave radiation budget at the top and base of the atmosphere

  • Man Li C. Wu
  • Lihsiung Aron Chang
  • Wm. Smith
Article

Summary

The effect of clouds on longwave radiation budget at the top and base of the atmosphere is studied by using the HIRS2/MSU-retrieved temperature and humidity fields, and cloud fields and the International Satellite Cloud Climatology Project-produced fields. Detailed studies are carried out at four selected sites: one at Equatorial Eastern Pacific (ITCZ) area, one at Libyan Desert (Libya), one at Ottawa, Montreal (Ottawa), and one at central Europe (Europe). The monthly mean differences in outgoing longwave radiation (OLR) (the ISCCP-based OLR minus the HIRS2-based OLR), ranging from −2.8 Wm−2 at ITCZ to −15.4 Wm−2 at Ottawa, are less than the monthly mean differences in surface downward flux, ranging from −2.7 Wm−2 at Libya to 40.6 Wm−2 at the ITCZ. The large differences in surface downward flux are mainly due to large differences in cloud amount and moisture in the low levels of the atmosphere.

Monthly mean OLR and surface downward flux can be derived either (1) from instantaneous temperature, humidity, and cloud fields over a month period or (2) from monthly mean temperature, humidity, and cloud fields. The monthly mean OLR and surface downward flux derived from the first approach is compared with the second. The differences in OLR are small, ranging from −0.05 Wm−2 to 6.2 Wm−2, and the differences in surface downward flux is also small, ranging from 0.4 Wm−2 to 6.4 Wm−2.

Keywords

Radiation Atmosphere Climate Change Waste Water Europe 

List of Acronyms

AVHRR

Advanced Very High Resolution radiometer

ERB

Earth Radiation Budget

ERBE

Earth Radiation Budget Experiment

FGGE

First Global GARP Experiment

GARP

Global Atmospheric Research Program

GCM

General Circulation Model

GISS

Goddard Institute for Space Studies

GLA

Goddard Laboratory for Atmospheres

GMS

Geostationary Meteorological Satellite

GOES

Geostationary Operational Environmental Satellite

HIRS2

High Resolution Infrared Radiation Sounder/2

ISCCP

International Satellite Cloud Climatology Project

IR

Infrared

MSU

Microwave Sounding Unit

NFOV

Narrow Field of View

NOAA

National Oceanic and Atmospheric Administration

NESDIS

National Environmental Satellite Data Information Service

TOVS

TIROS Operational Vertical Sounder

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Man Li C. Wu
    • 1
  • Lihsiung Aron Chang
    • 2
  • Wm. Smith
    • 2
  1. 1.Laboratory for AtmospheresNASA/Goddard Space Flight CenterGreenbeltUSA
  2. 2.Centel Federal Services StaffRockvilleUSA

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