GERB STM, Exeter, Oct. 20061 SW Diurnal Errors in ERB monthly means: some studies from CERES and GERB LMD/IPSL M. Viollier and A. Ben Rehouma Ecole Polytechnique,

Slides:

Advertisements

Similar presentations

SW o SOLAR LW o OLR. SW response T response ScaRaB = SW and LW broadband radiometer measuring the whole spectral ranges of the solar reflected radiation.

Advertisements

Stratospheric Measurements: Microwave Sounders I. Current Methods – MSU4/AMSU9 Diurnal Adjustment Merging II. Problems and Limitations III. Other AMSU.

© University of Reading Richard Allan Department of Meteorology, University of Reading Thanks to: Jim Haywood and Malcolm.

IRS2004, Busan, August 2004 Using Satellite Observations and Reanalyses to Evaluate Climate and Weather Models Richard Allan Environmental Systems Science.

Changes in clear-sky longwave radiative cooling in the atmosphere Richard Allan Environmental Systems Science Centre, University of Reading,

1 Evaluating climate model using observations of tropical radiation and water budgets Richard P. Allan, Mark A. Ringer Met Office, Hadley Centre for Climate.

EUMETSAT 2006 Helsinki Exploitation of GERB/SEVIRI data for evaluation of the Met Office global forecast model Richard Allan, Tony Slingo Environmental.

GERB/CERES Meeting 2006 Exeter Evaluation of clouds and radiation in the Met Office global forecast model using GERB/SEVIRI data Richard Allan, Tony Slingo.

Earth Radiation Budget Studies over the tropical monsoon region using satellite data P. C. Joshi Meteorology and Oceanography Group Space Applications.

TOA radiative flux diurnal cycle variability Patrick Taylor NASA Langley Research Center Climate Science Branch NEWS PI Meeting.

Diurnal asymmetry in the GERB(-like) fluxes: an update Cédric Bertrand Royal Meteorological Institute of Belgium, Brussels, Belgium.

Megha-Tropiques Workshop, Ahmedabad, October ScaRaB / Megha-Tropiques: objectives, description, calibration and radiance-to-flux conversion ScaRaB:

Chiara Piccolo and Anu Dudhia Atmospheric, Oceanic and Planetary Physics, Department of Physics, Oxford University, Oxford, UK Predicted.

Surface Skin Temperatures Observed from IR and Microwave Satellite Measurements Catherine Prigent, CNRS, LERMA, Observatoire de Paris, France Filipe Aires,

Combining satellite and surface observations to determine the radiative divergence across the atmosphere Tony Slingo Environmental Systems Science Centre.

Earth Radiation Budget Observations Hai-Tien Lee Arnold Gruber University of Maryland College Park, CICS/ESSIC-NOAA Robert G. Ellingson Florida State University,

Lunar Observations of Changes in the Earth’s Albedo (LOCEA) Alexander Ruzmaikin Jet Propulsion Laboratory, California Institute of Technology in collaboration.

Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)

1 NOAA’s National Climatic Data Center April 2005 Climate Observation Program Blended SST Analysis Changes and Implications for the Buoy Network 1.Plans.

J. S. Parihar Agricultural Resources Group Space Applications Centre (ISRO) Ahmedabad, India Land applications from Megha.

MT Workshop October 2005 JUNE 2004 DECEMBER 2004 End of OCTOBER 2005 ? MAY 2002 ? Capabilities of multi-angle polarization cloud measurements from.

Orbit Characteristics and View Angle Effects on the Global Cloud Field

Z. P. Szewczyk GIST 25, Oct Recent Field Campaigns with CERES Instruments Z. Peter Szewczyk Kory J. Priestley Lou Smith Remote Sensing of Clouds.

Synoptic variability of cloud and TOA radiative flux diurnal cycles Patrick Taylor NASA Langley Research Center Climate Science Branch

1 CERES Results Norman Loeb and the CERES Science Team NASA Langley Research Center, Hampton, VA Reception NASA GSFC, Greenbelt, MD.

AGU 2002 Fall Meeting NASA Langley Research Center / Atmospheric Sciences Validation of GOES-8 Derived Cloud Properties Over the Southeastern Pacific J.

Presentation of the monthly mean CM-SAF products Didier Caprion RMIB.

CERES on Terra & Aqua validation and participation in SCALES Z. Peter Szewczyk G. Louis Smith The GIST 19, RAL 08/27-29, 2003.

Overview of the “Geostationary Earth Radiation Budget (GERB)” Experience. Nicolas Clerbaux Royal Meteorological Institute of Belgium (RMIB) In collaboration.

On the application of CERES SW ADMs Cédric Bertrand.

The diurnal cycle in GERB data Analysis of the diurnal cycle of outgoing longwave radiation (OLR) One month of GERB top of atmosphere OLR flux data from.

3rd Indo-French Workshop on Megha-Tropiques under ISRO-CNES Programme on Atmosphere, Climate and Oceanography, Ahmedabad, India October 17-20, Convection,

Dust Longwave Forcing from GERB and SEVIRI Vincent Gimbert, H.E. Brindley, J.E. Harries Imperial College London GIST 26, 03 May 2007, RAL, Abingdon Thanks.

A Preliminary Evaluation of the Global Water and Energy Budgets in an Upcoming NASA Reanalysis Junye Chen (1,2) and Michael G. Bosilovich (2) 1 ESSIC,

© Imperial College LondonPage 1 Cloud Forcing Studies using CERES and GERB(-like) data Joanna Futyan, Jacqui Russell and John Harries GIST 22 RMIB, Brussels,

Radiative Atmospheric Divergence using ARM Mobile Facility, GERB data and AMMA stations –led by Tony Slingo, ESSC, Reading University, UK Links the ARM.

IPWG, M. Desbois, Megha-Tropiques, Melbourne, October Status of the Indo-French Megha-Tropiques satellite project, perspectives for tropical systems.

Evaluation of Passive Microwave Rainfall Estimates Using TRMM PR and Ground Measurements as References Xin Lin and Arthur Y. Hou NASA Goddard Space Flight.

Investigations of Artifacts in the ISCCP Datasets William B. Rossow July 2006.

R. T. Pinker, H. Wang, R. Hollmann, and H. Gadhavi Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland Use of.

© Imperial College LondonPage 1 Estimating the radiative effect of mineral dust over ocean The radiance to flux problem Dust retrieval quality Applying.

2004/04/02GIST 21, Boulder M. Viollier et al.1 Time sampling bias: combination of CERES with Meteosat narrow-bands and beginning a comparison with GERB.

Page 1© Crown copyright 2006 Modelled & Observed Atmospheric Radiation Balance during the West African Dry Season. Sean Milton, Glenn Greed, Malcolm Brooks,

Diurnal Cycle of Cloud and Precipitation Associated with the North American Monsoon System Pingping Xie, Yelena Yarosh, Mingyue Chen, Robert Joyce, John.

2004/11/10GIST 22, Brussels, LMD, M. Viollier1 POLDER, CERES, GERB flux comparisons and information on AMMA and MeghaTropiques Michel Viollier Laboratoire.

Aerosol Radiative Forcing from combined MODIS and CERES measurements

CM-SAF Board Meeting, Offenbach, April 2006 CM-SAF TOA radiation status report D. Caprion Royal Meteorological Institute of Belgium.

© Imperial College LondonPage 1 Inter-comparisons of monthly mean (and monthly time-step mean) GERB clear sky fluxes Joanna Futyan, Richard Allan and Jacqui.

Generation of TOA Radiative Fluxes from the GERB Instrument Data. Part II: First Results Nicolas Clerbaux and GERB team Royal Meteorological Institute.

Evidence in ISCCP for regional patterns of cloud response to climate change Joel Norris Scripps Institution of Oceanography ISCCP at 30 Workshop City College.

Using GERB and CERES data to evaluate NWP and Climate models over the Africa/Atlantic region Richard Allan, Tony Slingo, Ali Bharmal Environmental Systems.

Interannual Variability and Decadal Change of Solar Reflectance Spectra Zhonghai Jin Costy Loukachine Bruce Wielicki (NASA Langley research Center / SSAI,

Evaluating the Met Office global forecast model using GERB data Richard Allan, Tony Slingo Environmental Systems Science Centre, University of Reading.

NASA Langley Research Center / Atmospheric Sciences CERES Instantaneous Clear-sky and Monthly Averaged Radiance and Flux Product Overview David Young NASA.

1 Changes in global net radiative imbalance Richard P. Allan, Chunlei Liu (University of Reading/NCAS Climate); Norman Loeb (NASA Langley); Matt.

Validation status overivew

Validation status overivew

TOA Radiative Flux Estimation From CERES Angular Distribution Models

Radiative biases in Met Office global NWP model

Using SCIAMACHY to calibrate GEO imagers

On the use of Ray-Matching to transfer calibration

Requirements for microwave inter-calibration

Eumetsat conference 2004, Praha

Characterizing DCC as invariant calibration target

Retrieving the Stratospheric Diurnal Cycle from AMSU measurements

Validating CERES calibration and ADMs Using Data from East Antarctica

Inter-satellite Calibration of HIRS OLR Time Series

NOAA Objective Sea Surface Salinity Analysis P. Xie, Y. Xue, and A

CURRENT Energy Budget Changes

Presentation transcript:

GERB STM, Exeter, Oct SW Diurnal Errors in ERB monthly means: some studies from CERES and GERB LMD/IPSL M. Viollier and A. Ben Rehouma Ecole Polytechnique, Palaiseau, France

GERB STM, Exeter, Oct Comparison between the SW monthly means over two regions Reg#1 the whole area (45°S-45°N/60°W-60°E) Reg#2 (35°-10°S/10°W-10°E) with systematic diurnal cycle sharp diurnal errors SW standard deviation Month: August

GERB STM, Exeter, Oct SW Mean over Reg#1 Monthly Anomaly defined / all available years Scanners Nonscanner ISCCP-FD Negative trend See also, Wong et al (2006) Zhang et al (2004), for the tropical mean

GERB STM, Exeter, Oct Regional Anomaly (Reg # 2 – Reg # 1) Nonscanner ISCCP-FD +1.5 ± ± 0.8 Slope Wm -2 /decade ±  taking autocorrelation into account, according to Weatherhead et al JGR (1998) More on our Friday presentation

GERB STM, Exeter, Oct Scanner Serie (Reg # 2 – Reg # 1) with Terra with Average of Terra and Aqua +5.0 ± ± 2.0

GERB STM, Exeter, Oct Diurnal corrections for CERES-Terra, several approaches SRBAVG geo products ( about 2 years, 2000/03  2004/05) Combination (or average) of Terra and Aqua (ES4, about 4 years, 2002/07  2005/12) Examination of GERB ARG Ed1 products 5 months: 2006, 04 to 08)

GERB STM, Exeter, Oct Diurnal error, January 2003 Computed from differences between CERES SRBAVG GEO – NON GEO 1 x 1° Computed from differences between (Aqua+Terra) and Terra alone 2.5 x 2.5 °

GERB STM, Exeter, Oct Diurnal error, October 2003

GERB STM, Exeter, Oct SW Diurnal Errors, reg 2 (up), reg 1 (down) REG2 REG1

10 Comparisons between contemporary T-(TA) and nonGeo-Geo / 2003 Agreement at least for these areas and their differences; the variations are higher for SRBAVG

GERB STM, Exeter, Oct Same for Albedo, 2003

GERB STM, Exeter, Oct GERB, 2006 July, LW flux SW flux

GERB STM, Exeter, Oct Diurnal Cycle – August 2006 Area: 2.5x2.5° X 100

GERB STM, Exeter, Oct Albedo Diurnal Cycle – hourly means- off Angola Area: 2.5x2.5° May 2006April 2006 July 2006 Aug 2006

GERB STM, Exeter, Oct Albedo Diurnal Cycle – hourly means- Sahara Area: 2.5x2.5° May 2006April 2006 July 2006 Aug 2006

GERB STM, Exeter, Oct SW Monthly Means Computations with GERB Average the fluxes (2.5°x2.5°) and fill the 24x31 day-hour table Use ‘ERBE-type’ code, with Terra flux estimates (ES9- Ed1 - CV ) to compute monthly means Repeat using the GERB observed diurnal albedo variation shape in place of the ERBE modeled albedo

GERB STM, Exeter, Oct GERB April 2006 GERB2006

GERB STM, Exeter, Oct SRBAVG, TA and GERB April GERB2006 SRBAVG2003 SRBAVG2002 TA2003

GERB STM, Exeter, Oct SRBAVG, TA and GERB August SRBAVG 2001 GERB2006 SRBAVG2003 TA2003

GERB STM, Exeter, Oct Summary of Diurnal Errors Wm -2 Reg2 – Reg1JJANDJYear SRBAVG nonGeo-Geo Terra- Ave( Terra,Aqua) GERB correction applied to Terra Caution: Not the same years for each case

GERB STM, Exeter, Oct Conclusion We have looked for inter-regional differences in the evolution of the SW reflected flux (Reg1, Reg2) Reg 2 (South East Atlantic): diurnal errors are critical when using ES4-Terra (morning observation) Significant agreement between 3 independent evaluations of the relative diurnal errors (SRBAVG, Aqua, GERB); waiting for overlapping periods This is shown only for the studied regions and for their differences The SW positive change (relatively to the average Reg1) observed with Terra seems slightly greater than the diurnal error

22 Indo-French Megha-Tropiques satellite project Saphir : microwave sounder for water vapour sounding : 6 channels in the WV absoption band at GHz. (cross track, 10 km) MADRAS : microwave imager for precipitation : channels at 18, 23, 37, 89 and 157 GHz, H and V polarisations. (conical swath, <10 km to 40 km) ScaRaB

GERB STM, Exeter, Oct The three instruments of Megha-Tropiques ScaRaB : wide band instrument for inferring longwave and shortwage outgoing fluxes at the top of the atmosphere (cross track scanning, 40 km resolution at nadir) Saphir : microwave sounder for water vapour sounding : 6 channels in the WV absoption band at GHz. (cross track, 10 km) MADRAS : microwave imager for precipitation : channels at 18, 23, 37, 89 and 157 GHz, H and V polarisations. (conical swath, <10 km to 40 km)