Data Loss Assessed From EPCAPE Campaign

Published: 18 January 2024

After replacing the site data system at the Eastern Pacific Cloud Aerosol Precipitation Experiment (EPCAPE) in La Jolla, California, the Atmospheric Radiation Measurement (ARM) user facility has determined which data are missing and therefore unrecoverable as a result of the October 2023 system failure.

Here is the list of the affected instruments/datastreams and date ranges:

Aerosol Observing System (AOS)
- aethalometer (AETH), two-spot data: October 15 to 20
  - affected datastreams: epcaosaeth2spot1mM1.b1, epcaosaeth2spot1sM1.b1, epcaosaeth2spotM1.a1, epcaosaeth2spotM1.b1
- carbon monoxide analyzer (CO-ANALYZER): October 15 to 20
  - affected datastreams: epcaoscoM1.a1, epcaoscoM1.b1
- humidigraph: October 15 to 24
  - affected datastream: epcaoshumidigraphM1.a1
- meteorological measurements associated with the AOS (AOSMET): October 15 to 20
  - affected datastream: epcaosmetM1.a1
- nephelometer (dry and wet): October 15 to 24
  - affected datastreams: epcaosnephdry1mM1.b1, epcaosnephdryM1.a1, epcaosnephdryM1.b1, epcaosnephwet1mM1.b1, epcaosnephwetM1.a1, epcaosnephwetM1.b1
- optical particle counter (OPC): October 15 to 20
  - affected datastreams: epcaosopcM1.a1, epcaosopcM1.b1
- ozone monitor (OZONE/O3): October 15 to 20 for all non-calibration data; October 15 to 21 for b0-level calibration (cal) data
  - affected datastreams: epcaoso3calM1.b0, epcaoso3M1.a1, epcaoso3M1.b0, epcaoso3M1.b1
- particle soot absorption photometer (PSAP): October 15 to 20
  - affected datastreams: epcaospsap3w1mM1.b1, epcaospsap3w1sM1.b1, epcaospsap3wM1.a1, epcaospsap3wM1.b1
- scanning mobility particle sizer (SMPS): October 15 to 22, October 22 to 23, October 27 to 30
  - affected datastreams: epcaossmpsM1.a1, epcaossmpsM1.b1
- sulfur dioxide monitor (SO2): October 15 to 20 for all non-calibration data; October 15 to 21 for b0-level calibration (cal) data
  - affected datastreams: epcaosso2calM1.b0, epcaosso2M1.a1, epcaosso2M1.b0, epcaosso2M1.b1
- condensation particle counter – ultrafine (CPCU): October 15 to 20
  - affected datastreams: epcaoscpcu1mM1.b1, epcaoscpcuM1.a1, epcaoscpcuM1.b1
- atmospheric emitted radiance interferometer (AERI): October 14 to 25, October 26 to 27
  - affected datastreams: epcaerich1M1.b1, epcaerich2M1.b1, epcaeriengineerM1.b1, epcaerisummaryM1.b1
- eddy correlation flux measurement system (ECOR): October 15 to 30
  - affected datastream: epc30ecorM1.b1
- infrared thermometer (IRT): October 15 to 18, October 27 to 29
  - affected datastream: epcirtsstM1.b1
- Ka-Band Scanning ARM Cloud Radar (KASACR): October 15 to 17, October 31 to November 3
  - affected datastream: epckasacrcfrS2.a1
- Ka-Band ARM Zenith Radar (KAZR): October 15 to 18
  - affected datastreams: epckazrcfrspcgecopolM1.a1, epckazrcfrspcgexpolM1.a1, epckazrcfrspcmdcopolM1.a1, epckazrcfrspcmdxpolM1.a1
- laser disdrometer (LD): October 15 to 30
  - affected datastream: epcldM1.b1
- meteorological automatic weather station (MAWS): October 15 to 26
  - affected datastream: epcmawsM1.b1
- microwave radiometer (MWR): October 15 to 27
  - affected datastreams: epcmwrlosM1.b1, epcmwrtipM1.a1
- narrow-field-of-view zenith radiometer (NFOV), 2-channel: October 15 to 18, October 27 to 28
  - affected datastream: epcnfov2chM1.b1
- W-Band Scanning ARM Cloud Radar (WSACR): October 15 to 18
  - affected datastream: epcwsacrcfrS2.a1.

Data Quality Reports, which document the start and end dates and times of the missing data, are viewable in ARM Data Discovery. If you have questions about the data, please contact the mentor(s) of the affected instrument(s).

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ARM is a DOE Office of Science user facility operated by nine DOE national laboratories.

Data Loss Assessed From EPCAPE Campaign

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