GGrantIndex
← Search

THIS PROJECT WOULD PROVIDE FOR THE PARTICIPATION OF DUKE UNIVERSITY SCIENTISTS LED BY DR. DREW SHINDELL IN AN EXISTING NCAR-LED PROJECT TO ADDRESS TWO PRIMARY SCIENCE QUESTIONS: 1) WHAT IS THE IMPACT OF BIAS IN IPCC CLIMATE MODEL PREDICTIONS OF PRESENT DAY TOP-OF-ATMOSPHERE (TOA) FLUX IN THE 9.6 M OZONE BAND ON TROPOSPHERIC OZONE FLUX SENSITIVITY 2) WHAT IS THE IMPACT OF PRESENT DAY OZONE BIAS ON TROPOSPHERIC OZONE RADIATIVE FORCING AS PREDICTED BY THE CHEMISTRY CLIMATE MODEL INITIATIVE (CCMI)? THE TOA FLUX FOR THE 9.6 M OZONE BAND THAT IS PREDICTED BY IPCC CHEMISTRY-CLIMATE MODELS IS A FUNDAMENTAL QUANTITY THAT IS NOT BEING COMPARED DIRECTLY TO AVAILABLE SATELLITE MEASUREMENTS. WHILE THE TOTAL OUTGOING LONG-WAVE RADIATION (OLR) FROM MODELS IS COMPARED OR TUNED TO MATCH SATELLITE MEASUREMENTS FROM THE EARTH RADIATION BUDGET EXPERIMENT (ERBE) AND THE CLOUDS AND EARTH S RADIANT ENERGY SYSTEM (CERES) THERE HAVE BEEN RELATIVELY FEW VALIDATIONS OF THE SEPARATE WAVELENGTH BANDS USED FOR THE RADIATIVE TRANSFER MODELS (RTM) IN CLIMATE SIMULATIONS. FURTHERMORE IN PREVIOUS VALIDATIONS OF BAND RTMS THERE IS EVIDENCE OF ERROR CANCELLATION SUCH THAT THE MODEL OLR IS RIGHT FOR THE WRONG REASONS. WE PROPOSE TO BENCHMARK THE COMPARISON OF TOA OZONE BAND FLUX USING SATELLITE MEASUREMENTS FROM AURA-TES AND METOP-IASI FOR THE GISS CHEMISTRY-CLIMATE MODEL AND COMPARE THOSE RESULTS WITH SIMILAR ANALYSES TO BE PERFORMED AT NCAR USING THEIR CHEMISTRY-CLIMATE MODEL CAMCHEM. THIS WILL ALLOW US TO ATTRIBUTE DIFFERENCES IN TOA FLUX SENSITIVITY TO OZONE DISTRIBUTIONS TO ERRORS IN THE RTMS AND/OR ASSUMPTIONS ABOUT ATMOSPHERIC OPACITY DUE TO CLOUDS AND WATER VAPOR. SINCE THE SENSITIVITY OF TOA FLUX TO CHANGES IN TROPOSPHERIC OZONE IS USED TO CALCULATE RADIATIVE FORCING ULTIMATELY THESE RESULTS WILL TEST THE ACCURACY OF MODEL CALCULATIONS OF TROPOSPHERIC OZONE RADIATIVE FORCING. WE WILL INCORPORATE DIAGNOSTICS OF THE TOP-OF-ATMOSPHERE (TOA) FLUX (IN W M2) FOR THE 9.6M OZONE BAND WITHIN BOTH THE FULL GISS-MODELE2 GCM AND WITHIN THE ANALOGOUS SINGLE COLUMN MODEL (SCM). WE WILL USE THE FORMER TO BENCHMARK THE TOA FLUX COMPUTED BY THE CLIMATE MODEL OVER THE AURA EPOCH AGAINST SATELLITE OBSERVATIONS FROM TES AND IASI UNDER CLEAR AND CLOUDY CONDITIONS. WE WILL USE THE SCM TO EXAMINE HOW ERRORS IN TOA FLUX FOR THE OZONE BAND PROPAGATE INTO ERRORS IN MODEL SENSITIVITY TO OZONE ABUNDANCE AT EACH ALTITUDE REFERRED TO AS RADIATIVE KERNELS (IN W M2 PPB).

$96,016FY2015National Aeronautics and Space AdministrationNASA

Duke University, Durham NC

Investigators

View source on USAspending →
THIS PROJECT WOULD PROVIDE FOR THE PARTICIPATION OF DUKE UNIVERSITY SCIENTISTS LED BY DR. DREW SHINDELL IN AN EXISTING NCAR-LED PROJECT TO ADDRESS TWO PRIMARY SCIENCE QUESTIONS: 1) WHAT IS THE IMPACT OF BIAS IN IPCC CLIMATE MODEL PREDICTIONS OF PRESENT DAY TOP-OF-ATMOSPHERE (TOA) FLUX IN THE 9.6 M OZONE BAND ON TROPOSPHERIC OZONE FLUX SENSITIVITY 2) WHAT IS THE IMPACT OF PRESENT DAY OZONE BIAS ON TROPOSPHERIC OZONE RADIATIVE FORCING AS PREDICTED BY THE CHEMISTRY CLIMATE MODEL INITIATIVE (CCMI)? THE TOA FLUX FOR THE 9.6 M OZONE BAND THAT IS PREDICTED BY IPCC CHEMISTRY-CLIMATE MODELS IS A FUNDAMENTAL QUANTITY THAT IS NOT BEING COMPARED DIRECTLY TO AVAILABLE SATELLITE MEASUREMENTS. WHILE THE TOTAL OUTGOING LONG-WAVE RADIATION (OLR) FROM MODELS IS COMPARED OR TUNED TO MATCH SATELLITE MEASUREMENTS FROM THE EARTH RADIATION BUDGET EXPERIMENT (ERBE) AND THE CLOUDS AND EARTH S RADIANT ENERGY SYSTEM (CERES) THERE HAVE BEEN RELATIVELY FEW VALIDATIONS OF THE SEPARATE WAVELENGTH BANDS USED FOR THE RADIATIVE TRANSFER MODELS (RTM) IN CLIMATE SIMULATIONS. FURTHERMORE IN PREVIOUS VALIDATIONS OF BAND RTMS THERE IS EVIDENCE OF ERROR CANCELLATION SUCH THAT THE MODEL OLR IS RIGHT FOR THE WRONG REASONS. WE PROPOSE TO BENCHMARK THE COMPARISON OF TOA OZONE BAND FLUX USING SATELLITE MEASUREMENTS FROM AURA-TES AND METOP-IASI FOR THE GISS CHEMISTRY-CLIMATE MODEL AND COMPARE THOSE RESULTS WITH SIMILAR ANALYSES TO BE PERFORMED AT NCAR USING THEIR CHEMISTRY-CLIMATE MODEL CAMCHEM. THIS WILL ALLOW US TO ATTRIBUTE DIFFERENCES IN TOA FLUX SENSITIVITY TO OZONE DISTRIBUTIONS TO ERRORS IN THE RTMS AND/OR ASSUMPTIONS ABOUT ATMOSPHERIC OPACITY DUE TO CLOUDS AND WATER VAPOR. SINCE THE SENSITIVITY OF TOA FLUX TO CHANGES IN TROPOSPHERIC OZONE IS USED TO CALCULATE RADIATIVE FORCING ULTIMATELY THESE RESULTS WILL TEST THE ACCURACY OF MODEL CALCULATIONS OF TROPOSPHERIC OZONE RADIATIVE FORCING. WE WILL INCORPORATE DIAGNOSTICS OF THE TOP-OF-ATMOSPHERE (TOA) FLUX (IN W M2) FOR THE 9.6M OZONE BAND WITHIN BOTH THE FULL GISS-MODELE2 GCM AND WITHIN THE ANALOGOUS SINGLE COLUMN MODEL (SCM). WE WILL USE THE FORMER TO BENCHMARK THE TOA FLUX COMPUTED BY THE CLIMATE MODEL OVER THE AURA EPOCH AGAINST SATELLITE OBSERVATIONS FROM TES AND IASI UNDER CLEAR AND CLOUDY CONDITIONS. WE WILL USE THE SCM TO EXAMINE HOW ERRORS IN TOA FLUX FOR THE OZONE BAND PROPAGATE INTO ERRORS IN MODEL SENSITIVITY TO OZONE ABUNDANCE AT EACH ALTITUDE REFERRED TO AS RADIATIVE KERNELS (IN W M2 PPB). · GrantIndex