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Observation Systems Air-sea Fluxes, Clouds, Precipitation

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Observation Systems Air-sea Fluxes, Clouds, Precipitation

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  1. Shipboard Investigation of Air-sea Interaction and Cloud Processes in the VOCALS Stratocumulus RegionC. W. Fairall(1), D. Wolfe (1), S. Pezoa (1),S. de Szoeke(1), L. Bariteau (1, 2), Efthymios Serpetzoglou (3), Virendra Ghate (3), and Paquita Zuidema (3)Results from NOAA Stratus Cruises2001-2006

  2. Observation SystemsAir-sea Fluxes, Clouds, Precipitation Cloud Radar and Microwave Radiometer

  3. Measurement Systems for PACS/Stratus Cruises

  4. Cloud-Aerosol-Drizzle Connection Cloud-aerosol Indirect Effect Example from Stratus2005: Minimum in PBL aerosol concentration corresponds to broken cloud period and much higher transmission of solar flux to ocean. Broken cloud period was during a POC with drizzling mesoscale cloud features. Note cloud LWP about the same for solid vs broken clouds.

  5. Deduce Cloud Optical Properties:Observed cloud transmission coefficient

  6. STRATUS Cloud Optical Properties:LWP and Aerosol RelationshipsFrom the Diurnal Averaging Observed Optical thickness vs Observed LWP. Calif coast Naer=300/cc; Eq Pac Naer=50/cc Observed Optical thickness divided by 1-third power of Observed Aerosol Number Concentration versus Observed LWP

  7. Daily-averaged Stratus observations:SST and Sea-air Temperature difference

  8. Diurnal and Daily Average File Formats • yxz(:,1)=jdd;Julian Day • yxz(:,2)=rld;Downward IR flux W/m^2 • yxz(:,3)=rlclrd;Clear sky downward IR flux W/m^2 • yxz(:,4)=rsd;Downward solar flux W/m^2 • yxz(:,5)=rsclrd;Clear sky downward solar flux W/m^2 • yxz(:,6)=tsgd;Ship thermosalinograph water temperature (5 m depth) • yxz(:,7)=tsd; ESRL seasnake water temperature (5 cm depth) • yxz(:,8)=tad; Air Temperature (18 m) C • yxz(:,9)=tau opt; Cloud optical thickness • yxz(:,10)=zbmd; Median cloud base height m • yxz(:,11)=topd; Cloud top height • yxz(:,12)=wmd; Cloud liquid water path g/m^2 • yxz(:,13)=cldfd; Cloud fraction • yxz(:,14)=aer_mnd1; Aerosol number, size>.1 micron and size<.2 micron • yxz(:,15)=aer_mnd2; Aerosol number, size>.3 micron and size<.5 micron • yxz(:,16)=aer_mnd3; Aerosol number, size>1 micron and size<5 micron • yxz(:,17)=yrr; Year of the cruise • yxz(:,18)=raind; Rain rate mm/hr • yxz(:,19)=uxd; Northerly wind component m/s • yxz(:,20)=uyd; Easterly wind component m/s • yxz(:,21)=ud; Wind speed m/s • yxz(:,22)=hsd; Sensible heat flux W/m^2 • yxz(:,23)=hld; Latent heat flux W/m^2 • yxz(:,24)=taud; Stress N/m^2 • yxz(:,25)=zb1d; 15% cloud base height m • yxz(:,26)=clodthkd; Cloud thickness m • yxz(:,27)=ndd; Number cloud drops deduced from optical thickness • yxz(:,28)=latd; Latitude • yxz(:,29)=lond; Longitude

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