Outgoing longwave radiation biases and their impacts on empirical orthogonal function modes of interannual variability in the tropics

1995 ◽  
Vol 100 (D2) ◽  
pp. 3173 ◽  
Author(s):  
Mary T. Kayano ◽  
Vernon E. Kousky ◽  
John E. Janowiak
Keyword(s):  
Interannual Variability ◽  
Empirical Orthogonal Function ◽  
Outgoing Longwave Radiation ◽  
Longwave Radiation ◽  
Orthogonal Function ◽  
The Tropics

scholarly journals An Evaluation of Northern Australian Wet Season Rainfall Bursts in CMIP5 Models

2018 ◽  
Vol 31 (19) ◽  
pp. 7789-7802 ◽  
Author(s):  
Sugata Narsey ◽  
Michael J. Reeder ◽  
Christian Jakob ◽  
Duncan Ackerley
Keyword(s):  
Outgoing Longwave Radiation ◽  
Climate Models ◽  
Longwave Radiation ◽  
Cmip5 Models ◽  
Madden Julian Oscillation ◽  
Wet Season ◽  
The North ◽  
Coupled Climate Models ◽  
The Tropics ◽  
The Relationship

The simulation of northern Australian wet season rainfall bursts by coupled climate models is evaluated. Individual models produce vastly different amounts of precipitation over the north of Australia during the wet season, and this is found to be related to the number of bursts they produce. The seasonal cycle of bursts is found to be poor in most of the models evaluated. It is known that northern Australian wet season bursts are often associated with midlatitude Rossby wave packets and their surface signature as they are refracted toward the tropics. The relationship between midlatitude waves and the initiation of wet season bursts is simulated well by the models evaluated. Another well-documented influence on the initiation of northern Australian wet season bursts is the Madden–Julian oscillation (MJO). No model adequately simulated the tropical outgoing longwave radiation temporal–spatial patterns seen in the reanalysis-derived OLR. This result suggests that the connection between the MJO and the initiation of northern Australian wet season bursts in models is poor.

scholarly journals Outgoing Longwave Radiation due to Directly Transmitted Surface Emission

2012 ◽  
Vol 69 (6) ◽  
pp. 1865-1870 ◽  
Author(s):  
S. M. S. Costa ◽  
K. P. Shine
Keyword(s):  
Outgoing Longwave Radiation ◽  
Ad Hoc ◽  
Longwave Radiation ◽  
Detailed Calculation ◽  
Surface Emission ◽  
Clear Sky ◽  
Atmospheric Window ◽  
The Tropics ◽  
The Continuum

Abstract A frequently used diagram summarizing the annual- and global-mean energy budget of the earth and atmosphere indicates that the irradiance reaching the top of the atmosphere from the surface, through the midinfrared atmospheric window, is 40 W m−2; this can be compared to the total outgoing longwave radiation (OLR) of about 235 W m−2. The value of 40 W m−2 was estimated in an ad hoc manner. A more detailed calculation of this component, termed here the surface transmitted irradiance (STI), is presented, using a line-by-line radiation code and 3D climatologies of temperature, humidity, cloudiness, etc. No assumption is made as to the wavelengths at which radiation from the surface can reach the top of the atmosphere. The role of the water vapor continuum is highlighted. In clear skies, if the continuum is excluded, the global- and annual-mean STI is calculated to be about 100 W m−2 with a broad maximum throughout the tropics and subtropics. When the continuum is included, the clear-sky STI is reduced to 66 W m−2, with a distinctly different geographic distribution, with a minimum in the tropics and local peaks over subtropical deserts. The inclusion of clouds reduces the STI to about 22 W m−2. The actual value is likely somewhat smaller due to processes neglected here, and an STI value of 20 W m−2 (with an estimated uncertainty of about ±20%) is suggested to be much more realistic than the previous estimate of 40 W m−2. This indicates that less than one-tenth of the OLR originates directly from the surface.

Persistence of Outgoing Longwave Radiation Anomalies in the Tropics

1989 ◽  
Vol 117 (3) ◽  
pp. 670-679 ◽  
Author(s):  
Brant Liebmann ◽  
M. Chelliah ◽  
H. M. van den Dool
Keyword(s):  
Outgoing Longwave Radiation ◽  
Longwave Radiation ◽  
The Tropics

scholarly journals Long range forecasting parameters vis-a-vis sub-divisional summer rainfall over India

MAUSAM ◽  
2022 ◽  
Vol 44 (2) ◽  
pp. 185-190
Author(s):  
S.S. SINGH ◽  
S.V. DATAR ◽  
H.N. SRIVASTAVA
Keyword(s):  
Interannual Variability ◽  
Long Range ◽  
Empirical Orthogonal Function ◽  
Monsoon Rainfall ◽  
Summer Rainfall ◽  
Summer Monsoon Rainfall ◽  
Empirical Orthogonal Functions ◽  
Orthogonal Functions ◽  
Orthogonal Function ◽  
Global Parameters

Interannual variability of Empirical Orthogonal Functions (EOF) based upon regional/global parameters, associated with the summer monsoon rainfall over different meteorological sub-divisions of the country have been discussed, based upon the data during the years 1958 to 1990 enabling us to identify three broad  sub-divisions of the country.   It was interesting to note that the first empirical orthogonal function did not show significant correlation with monsoon rainfall over most SUB-DIVISIONS of the NE and SE parts of the country. However, this EOF was found to be significantly correlated with the rainfall over the remaining meteorological sub-divisions of the country.  

scholarly journals Interannual variability of outgoing longwave radiation as observed by AIRS and CERES

2012 ◽  
Vol 117 (D23) ◽  
pp. n/a-n/a ◽  
Author(s):  
Joel Susskind ◽  
Gyula Molnar ◽  
Lena Iredell ◽  
Norman G. Loeb
Keyword(s):  
Interannual Variability ◽  
Outgoing Longwave Radiation ◽  
Longwave Radiation
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