Cloud Remote Sensing. retrieval-breakdown to better understand cloud/aerosol/precip. cloud/aerosol/precipbehavior. characteristic/opportunityfor

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1 Cloud Remote Sensing -integral -integraltotovocals VOCALSobjectives objectives -we -wewant wanttotodo dothe thebest bestwe wecan: can: * *marine marinestratus stratusover overocean oceanisisthe theidealization idealization many manyretrievals retrievalsofofwarm warmcloud cloudproperties propertiesare arebased basedon on * *VOCALS VOCALSan anopportunity opportunitytotoboth bothnail naildown downretrievals retrievals&& use use retrieval-breakdowns retrieval-breakdown to better understand cloud/aerosol/precip cloud/aerosol/precipbehavior behavior * *unique uniquecharacteristic/opportunity characteristic/opportunityfor forvocals VOCALS Paquita Zuidema, RSMAS/U of Miami VOCALS Rex mtg. June 11-12, 2007

2 Typical Ship-board Cloud Sensing Capabilities: Vertically-pointing ceilometer (cloud base height) Surface radiative & turbulent fluxes Cloud radar Wind profiler (if Ron Brown) Lasair-II aerosol counter (but not EPIC) Rawindsondes Microwave Radiometer(s) Lidar - EPIC New to VOCALS Coordination with Aircraft (WCR,WCL,µphysics,MASTER) Proposed inclusion of 2 new µwave radiometers, Aircraft and ship each

3 Typical Ship-board Cloud Sensing Capabilities: Vertically-pointing ceilometer (cloud base height) Surface radiative & turbulent fluxes Cloud radar Wind profiler (if Ron Brown) Lasair-II aerosol counter (but not EPIC) Rawindsondes Microwave Radiometer(s) Lidar - EPIC New to VOCALS Coordination with Aircraft (WCR,WCL,µphysics,MASTER) Proposed inclusion of 2 new µwave radiometers, Aircraft and ship each

4 Why new microwave radiometers? Current NOAA radiometers have an approximate accuracy of 30 g m -2 at 10-minute resolution retrieved LWP adiabatic LWP retrieved LWP adiabatic LWP Local time Zuidema et al Okay for diurnal composite, statistical evaluations For aerosol-cloud-precip evaluations at the eddy scale & r e retrievals, would prefer higher accuracy

5 110 < LWP <121 g m < LWP <133 g m -2 τ c 133 < LWP <146 g m -2 Factor of -1 in slope, as expected from theory r e N CCN Aerosol scattering Aerosol index N d McComiskey and Feingold 2007 Pt Reyes, CA ARM data Measurement of τ c is more robust than measurement of r e

6 183-GHz radiometer holds promise: more sensitive to liquid water and not saturated by SEP water vapor Preliminary calculations suggest, for an instrument noise level of ms (Pazmany,2006), a LWP uncertainty of ~ 2 g m -2 all else assumed constant

7 183-GHz radiometer currently in use at Barrow, Alaska; will be tested with WCR &WCL on Wy. King Air soon 1 on NCAR C-130 (ONR proposal, Leon&Zuidema) Pro Sensing Inc. upward-viewing => aircraft needs to be below cloud at least 1 leg out of 5 completely below cloud? colocated with WCR & WCL& in-situ microphysics 1 on Ron Brown (NSF proposal, Zuidema) leased from Radiometrics colocated with other radiometers complement each other e.g. radiative flux closure => surface-based N d, r e retrievals can connect LWP to DSD

8 Relevance to satellite cloud remote sensing: better LWP data has potential to improve satellite LWP retrievals (collaboration with Remote Sensing Systems) If LES models produce LWPs similar to those observed, radiative transfer calculations on LES data could explain the puzzle of large satellite-retrieved r e How do cloud LWP distributions differ between open- and closed-cells?

9 Typical Ship-board Cloud Sensing Capabilities: Vertically-pointing ceilometer (cloud base height) Surface radiative & turbulent fluxes Cloud radar Wind profiler (if Ron Brown) Lasair-II aerosol counter (but not EPIC) Rawindsondes Microwave Radiometer(s) Lidar - EPIC New to VOCALS Coordination with Aircraft (WCR,WCL,µphysics) Proposed inclusion of 2 new µwave radiometers, Aircraft and ship each

10 NOAA Lidar: Epic radar+ lidar Janet Intrieri Lidar could provide insight into mesoscale organization

11 Parting Thought Data Integration is Key (retrievals themselves not so new)

12 Typical Ship-board Cloud Sensing Capabilities: Vertically-pointing ceilometer (cloud base height) Surface radiative & turbulent fluxes Cloud radar Wind profiler (if Ron Brown) Lasair-II aerosol counter (but not EPIC) Rawindsondes Microwave Radiometer(s) Lidar - EPIC New to VOCALS Coordination with Aircraft (WCR,WCL,µphysics) Proposed inclusion of 2 new µwave radiometers, Aircraft and ship each

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