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Overview of Satellite-Derived Cirrus Properties During SPARTICUS and MACPEX

This study presents satellite-derived cirrus cloud properties observed during the SEAC4RS mission, including high-cloud statistics, diurnal cycles, and convective cycle summaries in specific domains. The analysis covers occurrences, frequencies, and behaviors of cirrus clouds over various regions. Real-time imagery and tools are utilized for tracking and analyzing cirrus cloud features.

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Overview of Satellite-Derived Cirrus Properties During SPARTICUS and MACPEX

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  1. Overview of Satellite-Derived Cirrus Properties During SPARTICUS and MACPEX P. Minnis, L. Nguyen NASA Langley Research Center, Hampton, VA R. Palikonda, K. Bedka, T. Chee, D. A. Spangenberg, J. K. Ayers SSAI, Hampton, VA SEAC4RS Leadership Meeting Palmdale, CA, 31 January – 1 February 2012

  2. OBJECTIVES • Provide satellite complement to in situ, ground, and modeling studies • Provide high temporal resolution imagery for experiments • Provide consistent retrievals of cloud properties for experiments • Provide real-time support in field • Real-time imagery and interactive analysis - mission planning & execution • Near-real time cloud retrievals

  3. Data • MTSAT 30 min (on the half hour), 4-km resolution - 0.65, 3.9, 6.7, 10.8, 12.0 µm • FY-2E 1 hr (on the hour), 4-km resolution (calib?) -0.65, 3.9, 6.7, 10.8, 12.0 µm • Meteosat-7 30 min, 4-km resolution - GOES-13 (east): 0.73, 6.9, 11.5, µm • MODIS, twice daily (Terra & Aqua), 1-km, multispectral • NPP VIIRS, 1-km multispectral 1330 LT • NOAA-15/16/18/19 AVHRR, later • TRMM VIRS, TMI later

  4. High-Cloud Statistics, SEAC4RS Domain 0.25°, MTSAT, Aug-Sept 2008-2011 Frequency of Occurrence Fractional Coverage • Good location for studying ice clouds • Greatest amounts & frequencies over - Thailand, Cambodia, Bangladesh, & NE India - Gulf of Thailand, Bay of Bengal, Andaman Sea, E. South China Sea

  5. High-Cloud Diurnal Cycle, SEAC4RS Domain 0.25°, MTSAT, Aug-Sept 2008-2011 0000 UTC = 0700 LT 1200 UTC = 1900 UTC

  6. Overshooting Tops, Example IR channel used to detect OT, Bedka method 1-km VIS MTSAT IR • Detections correspond to turrets in 1-km VIS imagery

  7. Overshooting Tops, SEAC4RS Domain 0.25°, MTSAT, Aug-Sept 2005-2011 Total Occurrences Diurnal Behavior • Most common over Thailand & Cambodia, S. China Sea, NE Indian coast • Daytime peak over land • Night peaks over coastal waters • Mixed times over open waters

  8. Overshooting Tops, SEAC4RS Domain 0.25°, MTSAT, Aug-Sept 2005-2011 Occurrences, 9 AM – 9 PM Occurrences, 9 PM – 9AM • 9 AM - 9 PM: most over land, W. Bay of Bengal, S. China Sea • 9 PM – 9 AM: most over coastal water, S. China Sea

  9. Overshooting Tops, SEAC4RS Domain 0.25°, MTSAT, Aug-Sept 2005-2011

  10. Convective Cycle Summary • Over land - Peak convection occurs at ~0900 UTC (~4 PM) near coasts - Peak convection an hour or two later deep inland - Peak convection at ~ 2 AM over eastern Thai lowlands & Nan River Basin - Minimal deep convection before 0730 UTC (~2:30 PM) • Over water - Peak convection occurs at ~1400 UTC (~9 PM) near coasts - Peak convection moves seaward at later times - Peak convection during morning (6-10 AM) over N Bay of Bengal

  11. Langley SEAC4RS Web Page http://www-angler.larc.nasa.gov Click on “SEAC4RS” on sidebar or from main SEAC4RS page Under construction, will add climatological info soon + MODIS, AVHRR, VIRS

  12. Near-real time imagery from 3 GEOSats, 26 Jan 2012 FY-2, 0801 UTC MTSAT, 0832 UTC Met-7 IR, 1900 U Met-7 WV, 1900 U

  13. MTSAT-2 Retrieval Domains, SEAC4RS 0832 UTC, 26 Jan 2012 Domain (4-km) Large Domain (8-km)

  14. New Satellite Prediction Tool http://www-angler.larc.nasa.gov/gsp Will complement the old system

  15. Example of Convective Object Tracking http://angler.larc.nasa.gov/site/people/data/kbedka/seacrs_objects_anim.gif FY2-E, 28-29 Sept, 2010 IR age TminOT vectors strong conv

  16. Summary • Capabilities on site will be much enhanced compared to online data - change resolution and domain as desired - provide exact locations of objects as needed - variety of loops and model overlays as needed - flight tracks in near real time (given the nav data) • Add additional satellites to web page - MODIS, NPP, AVHRR, CALIPSO, CloudSat, TRMM • Matching of data with flights and ground sites as it comes in - cloud products & radiances • New algorithms to retrieve thin cirrus and ML clouds will be employed • Add features as requested, if possible

  17. SEAC4RS A-Train Cloud Climatology (2006-2009) 20 degree box centered on Bangkok. September 2006-2009 August 2006-2009 Cloud Cover: 88% Multi-layer: 52% Above 15 km all cirrus are tenuous – IWC < 0.005 g/m3 13-15 Km Most Cirrus are tenuous - IWC < 0.01 g/m3 At 10 km, most cirrus volumes have IWC > 0.05 g/m3

  18. Base Height-Layer Thickness Histograms August 2006-9 14 10 15% TTL all < 3 km thick 35% Cirrus 6-14 km > 3 km 10% Cirrus 6-10 km > 6 km Deep Echoes ~ 5% cover 20% Boundary Layer Cloud more or less evenly distributed in thickness Tendency for Cirrus to be lower and thicker in September. 6 3 2 1 0.5 0 0.25 0.5 1 3 6 10 September 2006-9 14 10 6 3 2 1 0.5 0 0.25 0.5 1 3 6 10

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