The impact of geophysical parameters on longwave radiation budget at the top and base of the atmosphere |
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| Authors: | Man Li C Wu Lihsiung Aron Chang Wm Smith |
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| Institution: | (1) Present address: Laboratory for Atmospheres, NASA/Goddard Space Flight Center, 20771 Greenbelt, Madison, USA;(2) Present address: Centel Federal Services Staff, 12730 Twinbrook Parkway, 20852 Rockville, MD, USA |
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| Abstract: | 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.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
With 4 Figures |
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