|
Read Full Article (file size: 122606 bytes) Cited by
GEOPHYSICAL RESEARCH LETTERS,
VOL. 30, NO. 15,
1822,
doi:10.1029/2003GL017545,
2003
Impact on regional winter climate by CO2 increases vs. by maritime-air advection
J. Otterman
Land-Atmosphere-Ocean-Research (LAOR), at Data Assimilation Office, CODE 910.3, NASA/GSFC, Greenbelt, Maryland, USA
R. Atlas
NASA/GSFC, Greenbelt, Maryland, USA
G. L. Russell
NASA/GISS, New York, New York, USA
H. Saaroni
Dept. of Geography and the Human Environment, Tel Aviv Univ., Tel Aviv, Israel
Abstract
Fractional Outgoing Radiation, FOR (dimensionless), defined as the ratio of Outgoing Longwave Radiation, OLR (W/m2), to upward Surface Longwave Emission, SLE (W/m2), is a basic parameter for analyzing regional greenhouse effect. Here, FOR values are derived from a General Circulation
Model by extracting OLR and SLE over areas in east-central Europe (at about 60°N) one hour after injecting appropriate CO2 concentration (adjustments to the atmospheric profile are thus excluded) to the Feb. 1 midnight simulation. The reduction
in FOR is 0.00051 when atmospheric CO2 increases by 14 ppm, which is the currently expected per-decade increase. Fluctuations in the North-Atlantic surface winds
produce fluctuations in FOR over central Europe: monthly-mean FOR in strong-wind February 1990 was 0.679, but 0.758 in weak-wind,
lower cloud-fraction February 1996. Strong maritime-air advection in 1990 resulted thus in FOR reduced by 0.079, effect by
two orders-of-magnitude stronger than the decrease effected by the per-decade increase in CO2.
Received 16
April
2003;
accepted 15
July
2003;
published 14
August
2003.
Index Terms: 3309 Meteorology and Atmospheric Dynamics: Climatology (1620); 3314 Meteorology and Atmospheric Dynamics: Convective processes; 3359 Meteorology and Atmospheric Dynamics: Radiative processes.
Read Full Article (file size: 122606 bytes) Cited by
Citation: Otterman, J., R. Atlas, G. L. Russell, and H. Saaroni
(2003),
Impact on regional winter climate by CO2 increases vs. by maritime-air advection,
Geophys. Res. Lett.,
30(15),
1822,
doi:10.1029/2003GL017545.
Copyright 2003 by the American Geophysical Union.
|