Dave Turner NOAA PECAN Science Workshop Norman, Oklahoma

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Presentation transcript:

Thermodynamic Profiling in the Boundary Layer from the AERIs at the PISA Sites Dave Turner NOAA PECAN Science Workshop Norman, Oklahoma 19-21 September 2016

Background PECAN integrated sounding array (PISA) stations were unique component of the PECAN field experiment Desire to have thermodynamic and wind profiling remote sensors at each PISA site for high temporal resolution observations Also launched radiosondes at these sites at periodically during IOPs Various universities and EOL contributed to each PISA My objective was to have consistent profiling capability at each site, if possible DOE’s ARM program provided AERI instruments at each PISA for thermodynamic profiling Ultimately, all 6 FPs and 2 (of 4) MPs had AERIs in them

Atmospheric Emitted Radiance Interferometer (AERI) Measures downwelling IR spectra at high temporal and spectral resolution (30 s, 1 cm-1) Invented by Univ Wisconsin – Madison Hardened, automated instrument; self-calibrating Commercially available 25 µm 7.1 µm 10 µm 15 µm Radiance [mW / (m2 sr cm-1)] Wavelength [µm] SGP, 8 Jul 2003 PWV: 48.0 mm NSA, 1 Mar 2004 PWV: 1.3 mm

FP Locations FP4: Minden FP5: Brewster FP3: Ellis FP6: Hesston FP2: Greensburg FP1: ARM SGP Site

MP1: CLAMPS MP3: SPARC OU / NSSL AERI, DL, MWR, tower, sondes Univ Wisc – Madison AERI, DL, HSRL, tower, sonde

AERIoe Data Availability per Day FP2: Greensburg FP3: Ellis FP4: Minden FP5: Brewster FP6: Hesston MP1: CLAMPS (2-min) MP3: SPARC

AERIoe Data Availability per Day FP2: Greensburg FP3: Ellis FP4: Minden FP5: Brewster FP6: Hesston MP1: CLAMPS (2-min) MP3: SPARC

AERIoe Data Availability per Day FP2: Greensburg FP3: Ellis FP4: Minden FP5: Brewster FP6: Hesston MP1: CLAMPS (2-min) MP3: SPARC

AERIoe Data Availability per Day FP2: Greensburg FP3: Ellis FP4: Minden FP5: Brewster FP6: Hesston MP1: CLAMPS (2-min) MP3: SPARC

AERIoe Data Availability per Day Abnormal oscillation found in FP1 System – still working to resolve this FP2: Greensburg FP3: Ellis FP4: Minden FP5: Brewster FP6: Hesston MP1: CLAMPS (2-min) MP3: SPARC

Two Versions of the Retrieval Algorithm Need to retrieve thermodynamic profiles from the AERI-observed infrared radiance Ill-posed problem (e.g., multiple solutions can yield obs) Original version in EOL archive: Release 1.5 Noted some cases when retrieved profiles were aphysical Decided to use additional observations to better constrain solution New version in EOL archive: Release 2.2 Algorithm improvements Uses surface humidity measurement and RAP model “observation”; the latter constrains the middle-and-upper troposphere Full error characterization for each retrieved profile in output file!

AERIoe Retrieval vs. Sonde AERIoe v2.2 AERIoe v1.5

AERIoe Retrieval vs. Sonde AERIoe v2.2 AERIoe v1.5

AERIoe Example from Ellis

AERIoe Example from Ellis

Comparison with Sondes

Examples vs. Sondes Sonde AERIoe v1.5 AERIoe v2.2

Summary AERIs were deployed at all FPs and 2 MPs AERIoe retrievals performed at each site Retrievals for FP2, FP3, FP4, FP5, FP6, MP1, and MP3 in EOL data archive Instrument issues still need to be resolved at ARM SGP (FP1) Two versions of algorithm; please use Release 2.2 Temporal resolution in archive is 5 min for most sites Can reprocess to have maximum temporal resolution of 30-s, if desired (useful for rapidly changing events like bores) If you use AERIoe retrievals from FPs, please credit DOE! If any questions about these data (accuracy, resolution, uncertainties, etc) please contact me.