Validation Science Team Meeting

Validation Science Team Meeting 14 Jan 2014 Dave Winker ... • Contribute to the development of the Validation Plan based on our experience with CALIPS...

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Validation Science Team Meeting 14 Jan 2014

Dave Winker NASA Langley Research Center Hampton, VA

Our Proposal Objectives •





CALIOP provides the only global profiles of clouds and aerosols and is thus an important validation resource for ATLID – However, CALIPSO and EarthCARE are in opposing orbits – CALIOP and ATLID operate at different wavelengths, so we must account for spectral dependence of aerosol (and cloud?) properties – We will determine strategies for best comparison of CALIPSO and EarthCARE observations LaRC HSRL used extensively for CALIOP validation – New instrument has HSRL at both 355 nm and 532 nm – We will develop plans to validate ATLID aerosol extinction and typing – We will investigate relations between aerosol properties at 355 nm and 532 nm to relate the CALIOP data record to ATLID Contribute to the development of the Validation Plan based on our experience with CALIPSO

Three co-aligned instruments: • CALIOP: polarization lidar - 70-meter footprint - 1/3 km footprint spacing



IIR: Imaging IR radiometer



WFC: Wide-Field Camera

– 8.6, 10.5, 12.0 um – 1 km footprint, 60 km swath

3

All: 0.381

OD > 0.3: 0.017

Annual mean cloud fraction of high cloud (> 6.5 km) from CALIOP

Zonal mean cloud fraction

Annual Mean AOD Day

Night

Zonal Mean Aerosol Extinction Profile

Aerosol Type Profile uncertainties evaluated using independent algorithms 8 L3, CAT, JJA

7

JJA, Sa = 30 40 6

50 60

Altitude (km)

5

4

3

2

1

0 10-5

10-4

10-3

10-2

10-1

Extinction (km -1)

(Winker et al., ACP, 2013)

100

HSRL-1 used extensively to validate CALIOP HSRL‐1 on B‐200:

Validation Examples Calibration

(Rogers et al., 2011)

(Burton et al., 2013)

Extinction

Lidar Ratio

B‐200:

“HSRL-2” - adds 355 nm channels Laser

Nd:YAG

Laser Pulse Energy

36  mJ: 1064 nm 13   mJ:  532 nm                30   mJ:  355 nm

Laser Repetition Rate

200 Hz

HSRL

Receiver Aperture

532 nm, 355 nm 1064 nm, 532 nm,  355 nm 40 cm

Receiver FOV

1 mrad

Vertical Resolution

30  m  

Depolarization

HSRL-2 Status • We plan to use HSRL-2 to validate ATLID retrievals and to link ATLID (355 nm) aerosol retrievals to CALIOP (532 nm) • HSRL-2 measures: – backscatter (355, 532, 1064) – extinction (355, 532) – depolarization (355, 532, 1064)

• Measurements and retrievals used to characterize: – aerosol extinction profiles and AOD – aerosol type (e.g. dust vs. smoke)

• Has flown on NASA B-200 in three campaigns in 2013: – California, Texas, US East Coast

• One campaign planned for 2014: – Colorado

• First test flights on NASA ER-2 in spring 2014 – higher altitude, longer range than B-200

DISCOVER-AQ (California, Jan-Feb 2013)

Proposed Series of Future Campaigns • We have proposed to fly HSRL-2 under EarthCARE during future airborne campaigns – ABACUS campaign (AirBorne Aerosol and Cloud Survey) – submitted 10 January 2014 • Several campaigns proposed during 2016-2019 • Combination of in situ and remote sensing instruments carried on NASA P-3B or DC-8 aircraft • Objective: study black carbon aerosols in key regions – 3-D distribution downwind of sources – Physical, chemical, and optical properties

12

Proposed ABACUS Study Regions

Will study key regions impacted by black carbon aerosols: •Philippines (spring 2016) BC AAOD

- smoke and pollution

•Namibia (spring 2017) - smoke

•Cape Verde (fall 2018) - smoke and dust

•Japan and Asia outflow (spring 2019) - pollution and dust

DUST AAOD

13

CATS Lidar • NASA will place a cloud-aerosol lidar on ISS later this year (JEM platform) • Launch: fall 2014 (Falcon-9) • CALIPSO team will produce CALIPSO-like products from CATS mode 1 data – Coordinating with CATS team and developing software – Duplicate computer processing system being assembled – Products and file formats will be very similar to current CALIOP Level 2 products

14

Configuration of CATS Lidar •

To be operated on ISS JEM platform Two Nd:YAG lasers: 1064/532 1064/532/355

Receiver: 3- elastic backscatter/depolarization 532 HSRL mode Range resolution: 60 meters Four different footprints

Science Mode 1

Science Mode 2

Science Mode 3

Science Modes 4,5,6  (Backup)

1064, 532 nm backscatter lidar No HSRL Depolarization at 532, 1064 nm Mission Goals:  A, B

1064, 532 nm backscatter lidar 532 nm HSRL Depolarization at 1064 nm Mission Goals:  C, A (partial)

1064, 532, 355 nm backscatter lidar No HSRL Depolarization at 1064, 532, 355 nm Mission Goals:  A, B, C

Same capability as science mode  1, but using laser 2 and different  FOV selections

CATS ISS Orbital Coverage • •

ISS Orbit: 51° inclination, precesses 24 hours in about 60 days Altitude varies between 350 – 410 km, ~3 day near repeat cycle

File size: ½ orbit Frame size ~ 80 km (same as CALIPSO)

CATS provides better opportunities for comparison of data matched in space and time

latitude 

CALIPSO

longitude 

CATS

Parameter List

ATLID

MSI

ATLID+CPR ATLID+MSI

ATLID+MSI+CPR

Standard Products Feature and  target masks

Validation  Instruments CALIOP, HSRL‐2

Research Validation  Products Instruments Aerosol  HSRL‐2 extinction by type

Aerosol/cloud  extinction,  backscatter,  depolarization

CALIOP, HSRL‐2

‐‐‐

‐‐‐

Aerosol/cloud  lidar ratio Cloud flag, cloud  phase

HSRL‐2

‐‐‐

‐‐‐

CALIOP

Cloud OD, cloud  top, Reff

CALIOP  CALIOP IIR/CALIOP

Cloud top  IWC, Reff ‐‐‐

CALIOP IIR/CALIOP ‐‐‐

AOD

HSRL‐2

IWC, Reff, IWP

IIR/CALIOP

‐‐‐ ‐‐‐ Aerosol  HSRL‐2 extinction by type ‐‐‐

‐‐‐