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TheAmeriFluxTechTeam

Sebastien–LBNL Chad-OSUSigrid –LBNL Dave-UNLStephen –LBNLHousen–LBNL(notinthepicture)

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AmeriFluxTechTeamsitevisitsWhattoexpectbefore,during,andafterasitevisit

US-KBS

US-EML

US-ICs

US-SO4US-Prr

CA-MerUS-TON

US-AUD

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Purposeandobjectives

Sitevisitshelpmaintainthedataqualityreportedtothenetwork•  TechTeamworksinacollaborativeeffortwithsitestaff;•  Identifydifferencesinsystemswhetherduetoinstrumentalbias,instrumentalerror,ordataprocessing;

•  Sitevisitsareshortterm(~2week),side-by-sidecomparisonsusinganindependentreferencesystemcalledthePortableEddyCovarianceSystem(PECS).

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PECS

Gasanalyzers•  ClosedpathCO2/H2OLI-7200IRGA•  Open-pathCO2/H2OLI-7500AIRGA•  Open-pathCH4LI-7700gasanalyzer

Sonicanemometer•  Gill,R3-50

Met.Sensors•  AspiratedPlatinumRTD(R.M.Young,41342)•  TairandRH(Vaisala,HMP155)•  4-componentradiometer(Kipp&Zonen,CNR4)•  Sunshinepyranometer(Delta-T,SPN1)•  Up-anddown-wellingPAR(Kipp&Zonen,PQS)•  Barometer(VaisalaPTB110)

Dataacquisitionsystem•  CPU(EChighfreq.data)•  CR1000datalogger(Metdata)•  Networking(Cellularmodem)

Powersupply•  Linepower;•  Gasgenerator•  Solarpanels/batteries

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Schedulingandlogistics

Sitesenvisagedareselectedduringwinter(Dec-Feb)•  ContactTechTeamtorequestsitevisit•  Initialcontact–gaugeinterest/availability,discusspossibledateranges;

•  Follow-up–confirmdates;•  Sendsitevisitquestionnaire.

Logistics•  TechTeamarrangeslodgingandtransportoptions;•  AllcostsofvisitarecoveredbytheAMP.

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Justpriortovisit

Forsitestaff:•  Ensuresiteaccessandnormalsiteoperations(data,power,communications,etc).

ForTechTeam:•  Shipequipment(10-16largecases,500+lbs)•  Contactstaffandconfirmarrivalandsiteaccessdates/plans;

•  Fallprotectionpermit(ifnecessary);•  Checkweather;•  Rentappropriatevehicle.

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Uponarrival

•  Meetsitestaff;•  Pickupequipment,purchasesupplies(dist.H2O;oil,fuel,etc.);•  Calibrategasanalyzers:•  Willusuallyoccurthedaypriortosetup;•  Preferlabsettingtoconductcalibration,ifavailable.•  Benchtopandpoweroutlet.

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Setupday

•  Meetsitestaffatsite;•  Discusssitesafetyandrules;•  Siteorientation;•  DiscussAmeriFluxsetupplans:•  Minimizeinterferingwithsiteoperations/instrumentation;

•  FindoptimallocationforPECSinstruments;

•  TechTeamcanusuallycompleteinstallationinasingleday;

•  Aftersetupcomplete,TechTeamwilldocumentandphotograph.

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Duringvisit

•  TechTeamremainlocalfordurationofvisit:•  MonitorPECSandensuredatacontinuity;

•  Maycollectadditionalobservations•  HelpwithBADMandlinkwithDatateam;•  Availableforconsultingwithsiteteam.

•  Mid-visitcomparison•  Preliminarydatacomparisonbetweensystemswillbeconductedandsharedwithsitestaff;

•  Valuableopportunitytoidentifyissuesandresolvepriortoendofcomparison.

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Takedownday

•  TechTeammayrequestsitestaffassistance;

•  Post-visitcalibrationofgasanalyzersmaybeperformed;

•  TechTeamwillarrangetransportationandshipmentofequipment(butassistanceappreciated!).

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Postvisit–datasharing

•  Filesshouldincludeheaders,units,metadata;•  Descriptionofprocessingsteps,algorithms,andcorrectionsapplied.Don’tassumeweknow.

•  Donotgapfilldata.•  Highfrequencydata:•  TechTeamwillconductindependentdataprocessing;•  Sharedfoldercanbeprovided(i.e.Dropbox).

•  30minuteprocesseddata:•  Fluxes,covariances,correctionterms;•  Statistics(mean,variance)forhighfrequencyvariables;•  Meteorological,radiation,ancillarydata.

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TechTeamreports

•  Sitevisitreportssharedwithsitestaff,providingkeyrecommendations;Extensivecomparisons,analysis;

•  Sitebenchmarkedagainstcumulativerecordofsitevisits;•  TechTeamdataavailableuponrequest;•  Feedbackfromsitestaffrequested.

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PortableProfileSystemTheAmeriFluxportableprofilesystem(PPS)isanewsupportcapabilitytoemphasizetheimportanceofcanopystorage.•  PPSprovidesahighqualityreferenceofverticalgradientsand

storagefortheNetwork.TheTechTeamiscurrentlydevelopingevaluationmetricsandcomparisonmethodologies.

•  PPScanbedeployedindependentlyofasitevisittoaidsitesinevaluatingcanopystorageorprofilesystemdesign(inletheights,samplingfrequency,etc).Additionalinformationincludingfull

partslistavailableontheAmeriFluxwebpage.

CO2(storage)profilesystem•  LI-840ACO2/H2OIRGA•  CR6datalogger•  Referencegases

SupportServices

•  TheseservicesareprovidedtoAmeriFluxsiteteamstofacilitatesiteoperationsandmaximizedataquality.Formostcases,theseareprovidedatnocosttoAmeriFluxsites(returnshippingexcepted).•  Calibrationgases•  Photosyntheticallyactiveradiation(PAR)sensors•  Loanerinstruments•  Portableprofilesystem•  RapidResponsesystem

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Contacts

AmeriFlux:https://ameriflux.lbl.gov/AmeriFluxTechTeam:ameriflux-tech@lbl.gov.