LidarConstantCCalibra.on•  NormalizedRela-veBacksca3ersignalisfoundbyapplyingthe

a=erpulse,dead-me,overlap,andrangecorrec-onstorawlidarsignal:

•  Themolecularprofilesrelyonnearbyradiosondeprofiles.•  Thecolumn-averagedlidarconstantCisfoundusingamolecular

fiFngalgorithmsearchingforthesta-s-callybesttopofaerosollayer.

•  AeronetAOD:AirportSite(76malt.)andMobileSite(341malt.)•  Theairportsitewascross-calibratedtothemobilesitetoincrease

thenumberoflidarCcalibra-ondatapoints.SolvingforLidarEx.nc.on•  AmolecularfiFngalgorithmfindsthetopoftheaerosollayer,

whichiscombinedwiththepreviouslyfoundCsolvesforthecolumnop-caldepth.

•  TheFernaldalgorithmisthenusedtofindtheex-nc-onprofile.•  Sincethisinversionisdependentonthemolecularfit,the

coefficientofvaria-onR2determinesthequalityofthedata.•  OnlyR2>0.5dataareconsidered.

Ascension Island Aeronet AOD (532 nm)

Airport Site (sea-level)0.1 0.2 0.3 0.4 0.5

AR

M S

ite (

365 m

)

0.1

0.2

0.3

0.4

0.5

DataFit: y = 0.915x - 0.0021 to 1 line

Results•  ThemountainsofAscensionIslandandproximitytotheocean

encourageorographicli=ingofmoistair.•  Consequently,Itiso=encloudyatthelidarmobilesite.•  Mostoftheop-caldepthstemsfromthecloudyboundarylayer(0

to2km).Theal-tuderangeabovetheclouds(2to5km)thatcancontainsmokeandotheraerosolswasmostpollutedinOct.2017,andmostpris-neinlateMay-earlyJune.

Duringthebiomassburningseason:

•  Thelowdepolariza-onra-oindicatesthattheaerosolsareprobablysmoke.

ElevatedaerosollayersalsooccurinFebandMarch(examplebelow).Thehigherdepolariza-onra-ossuggestthisisdustnotsmoke

Conclusion•  Aerosolsaboveclouds,between2to5km,areo=enpresentat

Ascension•  Anewfindingisthatthesearemorelikelytobedustinlateaustral

summer•  Theever-presentcloudsprovidedasignificantchallengeiniden-fy

goodqualitylidardata.•  Collabora-onwiththeCLARIFYteam,theNASAORACLESlidarteam

andthenewARMoverlapfunc-onhasallowedustoimproveourlidarex-nc-oncalcula-onandprovideconfidenceintheresults.

Introduc.on•  AscensionIsland(8S,14W)isanidealloca-ontowitnessthelong-

rangetransportofsmokefromAfricanbiomassburninganddust.•  TheDOEmicropulselidarprovidestheonlyconsistentindicatorof

ver-calstructureduringthe17-month-longLASICcampaign.•  Thelidarex-nc-onprofileisderivedusinganFernald-based

inversionalgorithmdevelopedattheUniversityofMiamiandisconstrainedbyAERONET-derivedaerosolop-caldepth.

•  Wecompareourlidarinvertedex-nc-onprofilestotheCLARIFYEXSCALABARaircra=in-situex-nc-onprofile.

Aim•  ComparisonbetweentheDOElidarandin-situex-nc-onvalues•  Observeaerosolstructureevolu-onbymonth.•  Be3erunderstandhowtoobtainhighqualityex-nc-onretrievals

frommicropulselidar

AcknowledgementsManythankstoDOEASRDE-SC0013720LASICplanninggrantandDE-SC0018272formakingthisresearchpossible.

ContactInforma.onRodrigoDelgadillo:rod@physics.miami.edu

AerosolVer.calStructureasAssessedbytheMicropulseLidaruponAscensionIslandduringtheLASICCampaign

RodrigoDelgadillo,P.Zuidema,P.Muradyan,R.L.Coulter,S.J.Abel,C.Fox,R.A.Ferrare,S.P.BurtonUniv.ofMiami/RSMAS,Miami,FLDOEArgonneNtnlLabUKMetOfficeNASALangley

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

08:13:50NRB max: 1.07

R2: 0.57

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

08:21:36NRB max: 1.06

R2: 0.63

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

08:26:16NRB max: 1.08

R2: 0.60

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

10:02:25NRB max: 0.94

R2: 0.61

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

17:01:02NRB max: 1.08

R2: 0.52

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

17:01:22NRB max: 1.09

R2: 0.51

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

17:11:20NRB max: 1.14

R2: 0.51

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

17:19:52NRB max: 1.19

R2: 0.61

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

17:20:16NRB max: 1.19

R2: 0.58

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

17:27:04NRB max: 1.18

R2: 0.61

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

17:27:27NRB max: 1.18

R2: 0.60

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

17:33:13NRB max: 1.24

R2: 0.53

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

17:33:50NRB max: 1.29

R2: 0.57

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

17:45:51NRB max: 1.25

R2: 0.68

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

17:48:30NRB max: 1.26

R2: 0.51

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

17:52:42NRB max: 1.25

R2: 0.51

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

18:01:57NRB max: 1.22

R2: 0.70

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

18:06:39NRB max: 1.22

R2: 0.57

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

18:11:04NRB max: 1.25

R2: 0.56

NRB [Counts km2/ 7J7s]

0 0.2 0.4

Ra

ng

e [

km]

0

5

10

18:14:46NRB max: 1.21

R2: 0.56

18-Aug-2017

SNRB(z) = C(�a(z) + �m(z))e�2(⌧a(z)+⌧m(z))

MPL Particle Extinction

18:00

04 Mar 2017

20:15 22:30 00:45 03:00 05:15 07:30 09:45 12:00

05 Mar 2017

Altitu

de

km

0

1

2

3

4

5

km

-1 0

0.06

0.12

0.18

0.24

60.3

MPL Linear Depolarization Ratio

18:00

04 Mar 2017

20:15 22:30 00:45 03:00 05:15 07:30 09:45 12:00

05 Mar 2017UTC

Altitu

de

km

0

1

2

3

4

5

0

0.03

0.06

0.09

0.12

60.15

R2 > 0.5

Ceilometer cloud base in red

MPL Particle Extinction

18:0014 Aug 2016

21:45 01:30 05:15 09:00 12:45 16:30 20:15 00:0016 Aug 2016

Alti

tud

ekm

0

1

2

3

4

5

km-1

0

0.06

0.12

0.18

0.24

60.3

MPL Linear Depolarization Ratio

18:0014 Aug 2016

21:45 01:30 05:15 09:00 12:45 16:30 20:15 00:0016 Aug 2016UTC

Alti

tud

ekm

0

1

2

3

4

5

0

0.03

0.06

0.09

0.12

60.15

R2 > 0.5

Ceilometer cloud base in red

ComparisonwithCLARIFYIn-situEx.nc.on(EXSCALABAR)•  MPLex-nc-onfor15minaverageoftherawlidardata:

•  Thepost-deploymentoverlapcalibra-ondonebyARMattheSGPsitedifferssubstan-allyfromthepre-deploymentcalibra-ondonebytheMPLmanufacturerSigmaSpace.Thenewoverlapplaceslessweightwithintheboundarylayer,reducingthoseex-nc-ons.

•  Thenewex-nc-onprofilesabove2kmhavever-calstructuresthatagreewiththosefromtheaircra=.

•  Correc-ngthederivedcolumn-averagedlidarra-otobe65/sr,themeanlidarra-ooffree-troposphericsmokeat530nmderivedbytheNASAHighSpectralResolu-onLidar2duringORACLESSept2016,bringstheMPL-retrievedvaluesintoapproximateagreementwiththein-situex-nc-on.

Integrated Extinction for Entire Campaign with 3 day running average

10Jul

2016

25 9Aug2016

24 8Sep2016

23 8Oct

2016

23 7Nov2016

22 7Dec2016

22 6Jan

2017

21 5Feb2017

20 7Mar2017

22 6Apr

2017

21 6May2017

21 5Jun

2017

20 5Jul

2017

20 4Aug2017

19 3Sep2017

18 3Oct

2017

18 2Nov2017

UTCIn

teg

rate

d E

xtin

ctio

n

0

0.05

0.1

0.15

0.2

0.25

0.3

od1: integrated from 0 to 2 kmod2: integrated from 2 to 5 km

Boundarylayer

Lowerfreetroposphere

CloudyprofilesexcludedbyfiFngalgoritm

MPL: 25-Aug-2017 14:30Aircraft: 25-Aug-2017 14:17 to 14:31

Extinction [Mm-1]

0 100 200 300 400 500

Alti

tude [km

]

0

1

2

3

4

5

6

2016 Sigma Space Overlap (aod: 0.29, R2: 0.56, LR: 18.07 sr-1)

2018 ARM Overlap (aod: 0.09, R2: 0.49, LR: 13.54 sr-1)Aircraft RH 405 (aod: 0.21)Aircraft RH 660 (aod: 0.11)

LR Adjusted MPL (65 sr-1)

MPL: 01-Sep-2017 13:45Aircraft: 01-Sep-2017 13:26 to 13:48

Extinction [Mm-1]

0 100 200 300 400 500

Alti

tude [km

]

0

1

2

3

4

5

6

2016 Sigma Space Overlap (aod: 0.72, R2: 0.19, LR: 13.65 sr-1)

2018 ARM Overlap (aod: 0.38, R2: 0.24, LR: 25.04 sr-1)Aircraft RH 405 (aod: 0.53)Aircraft RH 660 (aod: 0.28)

LR Adjusted MPL (65 sr-1)