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Earth Radiation Budget Observations. Hai-Tien Lee Arnold Gruber University of Maryland College Park, CICS/ESSIC-NOAA Robert G. Ellingson Florida State University, Dept. of Meteorology Istvan Laszlo NOAA/NESDIS. NOAA/NESDIS Cooperative Research Program 3rd Annual Science Symposium.

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Earth Radiation Budget Observations


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earth radiation budget observations

Earth Radiation BudgetObservations

Hai-Tien Lee

Arnold Gruber

University of Maryland College Park, CICS/ESSIC-NOAA

Robert G. Ellingson

Florida State University, Dept. of Meteorology

Istvan Laszlo

NOAA/NESDIS

NOAA/NESDIS Cooperative Research Program 3rd Annual Science Symposium

Fort Collins, CO, August 15-16, 2006

earth radiation budget
Earth Radiation Budget

Kiehl and Trenberth, 1997. Bull. Amer. Meteor. Soc., 78, 197-208.

history
History
  • First measurements of OLR as early as 1959 from Explorer-7
  • Experiments - ERB, ERBE, ScaRaB, CERES, GERB
  • First routine measurements of OLR from operational satellites began in 1974
    • NOAA scanning radiometer ( SR)- window channel ( 10-12 microns)
    • Linear algorithm between window radiances and total OLR – based on radiative calculations with model atmospheres
    • Evolved a few years later to a non linear algorithm which is still in use today - adjusted for different spectral interval
      • SR data 1974-1978, AVHRR 1979-onward
slide5
Tropical AVHRR OLR Anomaly Time/Longitude plot

1984-2003

[5S-5N]

Contour level 10Wm-2Pastel yellow are within ±10Wm-2

El Nino

slide7

Clear-sky OLR Anomaly (Jan 1998)

AVHRR OLR lacks sensitivity to water vapor variation, especially the upper tropo. humidity (UTH).

slide8

Multi-spectral HIRS OLR Algorithm

Ellingson et al. (1989)

ai=regression coefficients

=local zenith angle

slide9

Regression Model

  • Channels and spectral intervals – stepwise regression based on 1600 Phillips soundings and radiation transfer model
validation of multi spectral olr algorithms
Validation of Multi-spectral OLR Algorithms

Ellingson et al., 1994: Validation of a technique for estimating outgoing longwave radiation from HIRS radiance observations J. Atmos. Ocean. Technol., 11, 357-365.

Ba et al., 2003: Validation of a

technique for estimating OLR with the GOES sounder. J. Atmos. Ocean. Technol.,20, 79–89.

HIRS OLR is Operational since 1998.

slide13

AVHRR OLR PC3 and Satellite Observation Time

Pingping Xie, 2006

  • PC seems related to changes in satellite observations time
slide14

Inter-satellite Calibration

Collocation:

• 1°x1° lat/lon

• ±30 minutes

Homogeneity filter:

• Std error of mean OLR < 1 Wm-2

slide15

OLR Climatological Diurnal Model

25 Years of Monthly Mean OLR Local Time Composite

Tsaidam Basin

Western Pacific

erbs non scanner and hirs 1985 1999

ERBS Non-scanner and HIRS 1985-1999

Tropical 20 NS

ERBS NS vs. HIRS

Best-fit line slope = 0.998

STD = 0.97 Wm-2r = 0.86

HIRS product is as stable as ERBS-NS.

tropical mean olr 1984 2003
Tropical Mean OLR 1984-2003

Relative to HIRS

Tropical 20 NS

HIRS OLR is a reliable and traceable Transfer Standard

hirs ceres 2000 2004
HIRS-CERES 2000-2004

Global avg= 1.5 Wm-2

Global= 2.8 Wm-2

Mean diff

STD diff

Global= 4.0 Wm-2

RMS diff

Global RMS Diff = 4.0 Wm-2

* CERES ES4 from Terra-Xtrack Ed.2

slide20

Synergy between Operational Polar-Orbiting and Geostationary Satellite OLR Products

NOAA/MetOp/NPOESS - HIRS, IASI, CrIS, ERBS/CERES

Geostationary

FY-2C

GERBMet-8/9

GMS

Met-5

GOES-W

GOES-E

MTSAT

slide22

Validate HIRS OLR Diurnal Model using GOES Observations

Blue: HIRS

Red: GOES

Nevada

Storm track

Florida

Gulf of Mexico

Yucatan

Amazon

Sierra Madre Occidental

12

6

18

0

Andes

Subtropical Oceans

GOES and GERB OLR data provide detailed diurnal variation information that we can use it to construct and examine the diurnal models. This figure shows the phase information of the OLR diurnal variation for the GOES-E full disk domain with some typical patterns at selected sites. The HIRS-based diurnal model was compared against that of the GOES, which acts as a reference for error analysis.

Nevada