1 / 15

Improving Convective Sensitivity to Tropospheric Relative Humidity

This study explores methods to improve convective sensitivity to tropospheric relative humidity, presented by Richard Neale (NCAR) and Brian Mapes (RSMAS, University of Miami) at the AMWG Meeting on March 20, 2006. The research focuses on analyzing moisture sensitivity in the free troposphere, emphasizing the role of entrainment and cloud microphysics. Results indicate significant improvements in rainfall predictions for JJA (June-July-August), with reductions in systematic errors in precipitation forecasting and enhancements in the representation of diurnal rainfall cycles.

irma
Télécharger la présentation

Improving Convective Sensitivity to Tropospheric Relative Humidity

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related