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Improving Convective Sensitivity to Tropospheric Relative Humidity

Improving Convective Sensitivity to Tropospheric Relative Humidity. Richard Neale (NCAR) and Brian Mapes (RSMAS, University of Miami). AMWG Meeting, Mar 20, 2006. Free Troposphere. Altitude. PBL. 0 Moisture sensitivity +. Undilute. Dilute. Entraining Plume -Cloud water (1 g/kg)

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Improving Convective Sensitivity to Tropospheric Relative Humidity

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  1. Improving Convective Sensitivity to Tropospheric Relative Humidity Richard Neale (NCAR) and Brian Mapes (RSMAS, University of Miami) AMWG Meeting, Mar 20, 2006

  2. Free Troposphere Altitude PBL 0 Moisture sensitivity + Undilute Dilute Entraining Plume -Cloud water (1 g/kg) -Freezing below 273K -Entrainment chosen Pseudoadiabatic Ascent -No cloud water -No freezing -No entrainment (but implied) 0.2 X 100% + 0.8 X RHclr = 1.0 X 10% => RHclr = -12.5%

  3. Dilute Undilute JJA FV 2x2.5 1979-1988 Dilute minus GPCP Undilute - GPCP Dilute Undilute

  4. Undilute minus ERS Dilute minus ERS

  5. Dilute Undilute

  6. CAPT CCCP-ARM ParametrizationTestbed Dilute Undilute

  7. Dilute Variance of 5-day ave rainfall Undilute

  8. Dilute ENSO Warm minus Cold DJF Prect. Undilute

  9. Amplitude of Diurnal Cycle (mm/day) (JJA 1984) CAM3 (T85) 3B42 TRMM TMI/PR

  10. Local Time of Daily Rainfall Max CAM3 (T85) 3B42 TRMM TMI/PR

  11. 0300 Local Rainfall

  12. Overall JJA significant improvements (DJF some improvements Africa/Australia rainfall) -Reduction in S. Indian Ocean ITCZ -Enhanced Asian-Monsoon rainfall -Reduced twin ITCZ bias -Improved tropospheric humidity, MSE structure -Decrease in large Pacific high PSL error -Reduction in amplitude of diurnal cycle of rainfall/increased night-time rainfall -More realistic balance of convective/stratiform rainfall -CAPT tests, < half the error through day 5 forecast -ENSO wider Pacific equatorial signal (tentative) -Enhanced subseasonal variability (too much?) Some deterioration -Indian monsoon precipitation excess -South Atlantic circulation pattern -No change or slightly earlier diurnal cycle rainfall maximum

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